九天国际教育GCSE真题June 2015 QP - Unit 2 (F) OCR Chemistry (A) GCSE

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九天国际教育GCSE真题June 2013 (v3) QP - Paper 3 CIE Chemistry IGCSE

READ THESE INSTRUCTIONS FIRSTWrite your Centre number, candidate number and name on all the work you hand in.Write in dark blue or black pen.You may use a pencil for any diagrams, graphs or rough working.Do not use staples, paper clips, highlighters, glue or correction ﬂ uid.DO NOT WRITE IN ANY BARCODES.Answer all questions.Electronic calculators may be used.A copy of the Periodic Table is printed on page 12.You may lose marks if you do not show your working or if you do not use appropriate units.At the end of the examination, fasten all your work securely together.The number of marks is given in brackets [ ] at the end of each question or part question.CHEMISTRY0620/33Paper 3 (Extended)May/June 20131 hour 15 minutesCandidates answer on the Question Paper.No Additional Materials are required.UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certiﬁ cate of Secondary EducationThis document consists of 11 printed pages and 1blank page.[Turn overIB13 06_0620_33/2RP © UCLES 2013*6258911381*For1S ubstances can be classiﬁ ed as:Examiner’sUseelements mixtures compoundsE lements can be divided into:metals non-metals(a)D eﬁ ne each of the following terms.(i)e lement.................................................................................................................................... (2)(ii)c ompound.................................................................................................................................... (2)(iii)m ixture.................................................................................................................................... (1)(b)C lassify each of the following as either an element, compound or mixture.(i)b rass (1)(ii)c arbon dioxide (1)(iii)c opper (1)(c)W hich physical property is used to distinguish between metals and non-metals?I t is possessed by all metals but by only one non-metal. (1)[Total: 9]© UCLES 20130620/33/M/J/13For2O ne of the factors which determine the reaction rate of solids is particle size.Examiner’sUse(a)A mixture of ﬁ nely powdered aluminium and air may explode when ignited.A n explosion is a very fast exothermic reaction. This causes a large and sudden increasein temperature.E xplain each of the following in terms of collisions between reacting particles.(i)W hy is the reaction between ﬁ nely powdered aluminium and air very fast?.................................................................................................................................... (2)(ii)E xplain why for most reactions the rate of reaction decreases with time..................................................................................................................................... (2)(iii)S uggest an explanation why the rate of reaction in an explosion could increase rather than decrease with time......................................................................................................................................................................................................................................................................... (3)(b)(i)G ive another example of a substance other than a metal which, when ﬁ nelypowdered, might explode when ignited in air. (1)(ii)D escribe a simple test-tube reaction which shows the effect of particle size on the rate at which a solid reacts with a solution......................................................................................................................................................................................................................................................................... (3)[Total: 11]© UCLES 2013[Turn over0620/33/M/J/130620/33/M/J/13© UCLES 2013ForExaminer’sUse3I ron from the blast furnace is impure. It contains 5% of impurities, mainly carbon, sulfur, silicon and phosphorus. Almost all of this impure iron is converted into the alloy, mild steel.(a) (i) S tate a use of mild steel. (1)(ii) N ame and give a use of another iron-containing alloy.name ..........................................................................................................................use (2)(b) T he oxides of carbon and sulfur are gases. The oxides of silicon and phosphorus are not.Explain how these impurities are removed from the impure iron when it is converted into mild steel............................................................................................................................................ ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... (5)[Total: 8]4G ermanium is an element in Group IV. The electron distribution of a germanium atom is 2 + 8 + 18 + 4. It has oxidation states of +2 and +4.(a) G ermanium forms a series of saturated hydrides similar to the alkanes.(i) D raw the structural formula of the hydride which contains three germanium atomsper molecule.[1](ii) P redict the general formula of the germanium hydrides. (1)0620/33/M/J/13© UCLES 2013[Turn overFor Examiner’sUse(b) D raw a diagram showing the arrangement of the valency electrons in one molecule ofthe covalent compound germanium(IV ) chloride, GeC l 4.Use o to represent an electron from a chlorine atom.Use x to represent an electron from a germanium atom.[2](c) D escribe the structure of the giant covalent compound germanium(IV ) oxide, GeO 2.I t has a similar structure to that of silicon(IV ) oxide............................................................................................................................................ ........................................................................................................................................... (3)(d) I s the change GeC l 2 to GeC l 4 reduction, oxidation or neither? Give a reason for your choice............................................................................................................................................ (2)[Total: 9]5A ll metal nitrates decompose when heated. A few form a nitrite and oxygen. Most form the metal oxide, oxygen and a brown gas called nitrogen dioxide.(a) (i) N ame a metal whose nitrate decomposes to form the metal nitrite and oxygen. (1)(ii) C omplete the equation for the action of heat on lead(II ) nitrate.......Pb(NO 3)2 → ......... + ......NO 2 + O 2 [2](iii) S uggest why the nitrate of the metal, named in (a)(i), decomposes less readily thanlead(II ) nitrate..................................................................................................................................... (2)0620/33/M/J/13© UCLES 2013For Examiner’sUse(b) A lmost all samples of nitrogen dioxide are an equilibrium mixture of nitrogen dioxide,NO 2, and dinitrogen tetroxide, N 2O 4.forward reactionreverse reactionN 2O 4(g)colourless2NO 2(g)dark brownI n the forward reaction, a bond forms between the two nitrogen dioxide molecules.NO 2 + NO 2 → O 2N – NO 2(i) E xplain the term equilibrium mixture ..................................................................................................................................... .............................................................................................................................. [1] (ii) T he syringe contains a sample of the equilibrium mixture. The plunger was pulledback reducing the pressure.H ow would the colour of the gas inside the syringe change? Give an explanation foryour answer..................................................................................................................................... .................................................................................................................................... .............................................................................................................................. [3] (iii) A sealed tube containing an equilibrium mixture of nitrogen dioxide and dinitrogentetroxide was placed in a beaker of ice cold water. T he colour of the mixture changed from brown to pale yellow.I s the forward reaction exothermic or endothermic? Give an explanation for your choice..................................................................................................................................... (2)(iv) W hat other piece of information given in the equation supports your answer to (iii)?NO 2 + NO 2 → O 2N–NO 2 (1)[Total: 12]0620/33/M/J/13© UCLES 2013[Turn overForExaminer’sUse6S ulfuric acid and malonic acid are both dibasic acids. One mole of a dibasic acid can form two moles of hydrogen ions.H 2SO 4 → 2H + + SO 42–D ibasic acids can form salts of the type Na 2X and CaX.(a) M alonic acid is a white crystalline solid which is soluble in water. It melts at 135 °C.T he structural formula of malonic acid is given below. It forms salts called malonates.CH 2(COOH)2 or HOOC – CH 2 – COOH(i) H ow could you determine if a sample of malonic acid is pure?technique used .......................................................................................................... result if pure (2)(ii) W hat is the molecular formula of malonic acid? (1)(iii) W hen malonic acid is heated there are two products, carbon dioxide and a simplercarboxylic acid. Deduce the name and molecular formula of this acid..................................................................................................................................... .............................................................................................................................. [2] (iv) M alonic acid reacts with ethanol to form a colourless liquid which has a ‘fruity’ smell.I ts structural formula is given below.CC OOO OCH2CH 2CH 3CH 2CH 3W hat type of compound contains the group which is circled? (1)0620/33/M/J/13© UCLES 2013For Examiner’sUse(b) (i) S uggest why a solution of malonic acid, concentration 0.2 mol / dm 3, has a higher pHthan one of sulfuric acid of the same concentration. (1)(ii) D escribe a test, other than measuring pH, which can be carried out on both acidsolutions to con ﬁ rm the explanation given in (b)(i) for the different pH values of the two acids..................................................................................................................................... (2)(c) C omplete the following equations for reactions of these two acids.(i) sodium hydroxide + malonic acid → .................... + ....................[1].................... (ii) CuO + H 2SO 4 → .................... + .................... [2] (iii) Mg + CH 2(COOH)2 → .................... + ....................[2](iv) K 2CO 3 + H 2SO 4 → .................... + .................... + ....................[2][Total: 16]7 A lkanes and alkenes are both series of hydrocarbons.(a) (i) E xplain the term hydrocarbon ..................................................................................................................................... (1)(ii) W hat is the difference between these two series of hydrocarbons?.................................................................................................................................... (2)(b) A lkenes and simpler alkanes are made from long-chain alkanes by cracking.C omplete the following equation for the cracking of the alkane C 20H 42.C 20H 42 → 2C 4H 8 + 2C 2H 4 + ...............[1]0620/33/M/J/13© UCLES 2013[Turn overForExaminer’sUse(c) Alkenes such as butene and ethene are more reactive than alkanes.A lkenes are used in the petrochemical industry to make a range of products, which includes polymers and alcohols.(i) D ibromoethane is used as a pesticide. Complete the equation for its preparationfrom ethene.C C + Br 2 →HHH H[1](ii) T he structural formula of a poly(alkene) is given below.nC CH 3C CH 3HHD educe the structural formula of its monomer.[2](iii) H ow is butanol made from butene, CH 3 – CH 2 – CH = CH 2? Include an equation in your answer..................................................................................................................................... (2)(iv)C racking changes alkanes into alkenes. How could an alkene be converted into analkane? Include an equation in your answer..................................................................................................................................... (2)0620/33/M/J/13© UCLES 2013ForExaminer’sUse(d) 20 cm 3 of a hydrocarbon was burnt in 175 cm 3 of oxygen. After cooling, the volume ofthe remaining gases was 125 cm 3. The addition of aqueous sodium hydroxide removed carbon dioxide leaving 25 cm 3 of unreacted oxygen.(i) v olume of oxygen used = .......... cm 3 [1] (ii) v olume of carbon dioxide formed = .......... cm 3 [1](iii) D educe the formula of the hydrocarbon and the balanced equation for the reaction..................................................................................................................................... .................................................................................................................................... .................................................................................................................................... (2)[Total: 15]11BLANK PAGEPMT12Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included the publisher will be pleased to make amends at the earliest possible opportunity.University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.G ro u p140C eC e r i u m 58141P rP r a s e o d y m i u m 59144N d N e o d y m i u m 60P mP r o m e t h i u m61150S mS a m a r i u m62152E uE u r o p i u m63157G dG a d o l i n i u m64159T bT e r b i u m65162D yD y s p r o s i u m66165H oH o l m i u m67167E rE r b i u m68169T mT h u l i u m69173Y bY t t e r b i u m70175L uL u t e t i u m71232T hT h o r i u m 90P aP r o t a c t i n i u m 91238UU r a n i u m92N pN e p t u n i u m93P uP l u t o n i u m94A mA m e r i c i u m95C mC u r i u m96B kB e r k e l i u m97C fC a l i f o r n i u m98E sE i n s t e i n i u m99F mF e r m i u m100M dM e n d e l e v i u m101N oN o b e l i u m102L rL a w r e n c i u m1031HH y d r o g e n17L iL i t h i u m 323N aS o d i u m 1124M gM a g n e s i u m1240C aC a l c i u m 2045S c S c a n d i u m 2148T i T i t a n i u m2251V V a n a d i u m 2352C r C h r o m i u m 2455M n M a n g a n e s e 2556F e I r o n 2659C o C o b a l t 2759N i N i c k e l 2864C u C o p p e r 2965Z nZ i n c3070G aG a l l i u m3127A lA l u m i n i u m1311B B o r o n 512C C a r b o n614NN i t r o g e n716OO x y g e n819FF l u o r i n e928S iS i l i c o n1431PP h o s p h o r u s1532SS u l f u r1635.5C lC h l o r i n e1740A rA r g o n1820N eN e o n104H eH e l i u m273G eG e r m a n i u m3275A sA r s e n i c3379S eS e l e n i u m3480B rB r o m i n e3584K rK r y p t o n3639KP o t a s s i u m 1988S rS t r o n t i u m 3889Y Y t t r i u m 3991Z r Z i r c o n i u m4093N b N i o b i u m 4196M o M o l y b d e n u m 42T c T e c h n e t i u m 43101R u R u t h e n i u m 44103R h R h o d i u m 45106P d P a l l a d i u m 46108A gS i l v e r47112C dC a d m i u m48115I nI n d i u m49119S nT i n50122S bA n t i m o n y51128T eT e l l u r i u m52127II o d i n e53131X eX e n o n54137B aB a r i u m 56139L a L a n t h a n u m 57*178H fH a f n i u m72181T a T a n t a l u m 73184W T u n g s t e n 74186R e R h e n i u m 75190O s O s m i u m 76192I rI r i d i u m 77195P t P l a t i n u m78197A uG o l d79201H gM e r c u r y80204T lT h a l l i u m81207P bL e a d82209B iB i s m u t h83P oP o l o n i u m84A tA s t a t i n e85R nR a d o n86F rF r a n c i u m 87227A cA c t i n i u m899B eB e r y l l i u m4II I I I II V V V I V I I 085R bR u b i d i u m 37133C sC a e s i u m 55226R a R a d i u m 88T h e v o l u m e o f o n e m o l e o f a n y g a s i s 24d m 3a t r o o m t e m p e r a t u r e a n d p r e s s u r e (r .t .p .).a Xb a = r e l a t i v e a t o m ic m a s sX = a t o m i c s y m b o lb = p r o t o n (a t o m ic ) n u m b e rK e y *58-71 L a n t h a n o i d s e r i e s 90-103 A c t i n o i d s e r i e s D A T A S H E E T T h e P e r i o d i c T a b l e o f t h e E l e m e n t sPMT。

九天国际教育GCSE真题June 2017 QP - Paper 1C Edexcel Chemistry IGCSE

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九天国际教育GCSE真题November 2010 (v3) QP - Paper 5 CIE Chemistry IGCSE

九天国际教育GCSE真题November 2016 (v3) QP - Paper 4 CIE Chemistry IGCSE

READ THESE INSTRUCTIONS FIRSTWrite your Centre number, candidate number and name on all the work you hand in.Write in dark blue or black pen.You may use an HB pencil for any diagrams or graphs.Do not use staples, paper clips, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.Answer all questions.Electronic calculators may be used.A copy of the Periodic Table is printed on page 12.You may lose marks if you do not show your working or if you do not use appropriate units.At the end of the examination, fasten all your work securely together.The number of marks is given in brackets [ ] at the end of each question or part question.CHEMISTRY0620/43Paper 4 Theory (Extended)October/November 20161 hour 15 minutesCandidates answer on the Question Paper.No Additional Materials are required.Cambridge International ExaminationsCambridge International General Certificate of Secondary EducationThis document consists of 12 printed pages.[Turn overIB16 11_0620_43/4RP © UCLES 2016The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.0620/43/O/N/16© UCLES 20161(a) C omplete the table.particle charge relative massproton +1neutron 1electron[2](b) T he following are isotopes of carbon.C 126 C 136 C146 (i) I n terms of numbers of protons, neutrons and electrons, how are these three isotopes thesame and how are they different?T hey are the same because ............................................................................................... .............................................................................................................................................T hey are different because ................................................................................................. .............................................................................................................................................[3] (ii) W hy do all isotopes of carbon have the same chemical properties? (1)(c) N ame two forms of the element carbon which have giant covalent structures............................................................... and ........................................................................ [1] (d) C omplete the diagram to show the electron arrangement in a carbon dioxide molecule.S how the outer shell electrons only.O CO[2][Total: 9]2B eryllium is a metallic element in Group II.(a)G ive the electronic structure of a beryllium atom. (1)(b)G ive the formula of beryllium oxide. (1)(c)(i) D escribe the bonding in a metallic element such as beryllium.I nclude a labelled diagram and any appropriate charges in your answer........................................................................................................................................................................................................................................................................................... (3)(ii)E xplain why metallic elements, such as beryllium, are good conductors of electricity.............................................................................................................................................. (1)(d)B eryllium hydroxide is amphoteric.B eryllium hydroxide reacts with acids. The salts formed contain positive beryllium ions.(i)G ive the formula of the positive beryllium ion. (1)(ii)W rite a chemical equation for the reaction between beryllium hydroxide and hydrochloric acid. (2)(iii)B eryllium hydroxide also reacts with alkalis. The salts formed contain beryllate ions, BeO2–.2S uggest a chemical equation for the reaction between beryllium hydroxide andsodium hydroxide solution. (2)[Total: 11]© UCLES 2016[Turn over0620/43/O/N/163W hen lead(II) nitrate is heated, two gases are given off and solid lead(II) oxide remains.T he equation for the reaction is shown.2Pb(NO3)2(s) → 2PbO(s) + 4NO2(g) + O2(g)(a)C alculate the Mrof lead(II) nitrate. (1)(b)6.62 g of lead(II) nitrate are heated until there is no further change in mass.(i)C alculate the mass of lead(II) oxide produced............................ g [2](ii)C alculate the volume of oxygen, O2, produced at room temperature and pressure (r.t.p.)............................ dm3 [2](c)D escribe a test for oxygen.t est .............................................................................................................................................r esult ..........................................................................................................................................[2]0620/43/O/N/16© UCLES 2016(d)L ead(II) oxide is insoluble. A student adds solid lead(II) oxide to dilute nitric acid until thelead(II) oxide is in excess. Aqueous lead(II) nitrate and water are produced.(i)W hat is meant by the term excess? (1)(ii)H ow would the student know when the lead(II) oxide is in excess? (1)(iii)W rite a chemical equation for the reaction. (1)[Total: 10]© UCLES 2016[Turn over0620/43/O/N/164S ilicon(IV) oxide and sodium chloride have different types of bonding and structure.(a)N ame the type of bonding present ins ilicon(IV) oxide, .......................................................................................................................s odium chloride. ........................................................................................................................[2](b)N ame the type of structure present in silicon(IV) oxide. (1)(c) (i)S ilicon(IV) oxide has a high melting point. Explain why.............................................................................................................................................. (2)(ii)S ilicon(IV) oxide is a poor conductor of electricity. Explain why. (1)(d)S olid sodium chloride does not conduct electricity. However, it conducts electricity when molten.E xplain why solid sodium chloride does not conduct electricity, whereas molten sodium chloridedoes conduct electricity............................................................................................................................................................................................................................................................................................................................................................................................................................................................. (3)(e)A concentrated aqueous solution of sodium chloride is electrolysed using carbon electrodes.(i)N ame the products formed at the electrodes.p roduct at the positive electrode (anode) ...........................................................................p roduct at the negative electrode (cathode) .......................................................................[2](ii)W rite an ionic half-equation for the reaction occurring at the negative electrode. (1)© UCLES 20160620/43/O/N/16(f)A dilute aqueous solution of sodium chloride is electrolysed using carbon electrodes.N ame the main product formed at the positive electrode. (1)(g)M olten sodium chloride is electrolysed using carbon electrodes.(i)N ame the product formed at the negative electrode. (1)(ii)Write an ionic half-equation for the reaction occurring at the negative electrode. (1)(iii)C hlorine is produced at the positive electrode.G ive the test for chlorine.test ......................................................................................................................................result ...................................................................................................................................[2][Total: 17]© UCLES 2016[Turn over0620/43/O/N/165S ulfuric acid can be manufactured from the raw materials sulfur, air and water. The process can be divided into four stages.s tage 1converting sulfur into sulfur dioxides tage 2converting sulfur dioxide into sulfur trioxides tage 3converting sulfur trioxide into oleum, H2S2O7s tage 4converting oleum into sulfuric acidstage 1(a) (i)D escribe how sulfur is converted into sulfur dioxide. (1)(ii)W rite a chemical equation for the conversion of sulfur into sulfur dioxide. (1)stage 2(b)S ulfur dioxide is converted into sulfur trioxide according to the following equation.2SO2 + O22SO3T he reaction is carried out at a temperature of 450 °C and a pressure of 1–2 atmospheres using a catalyst. The energy change, ∆H, for the reaction is –196 kJ / mol.(i)W hat is the meaning of the symbol ? (1)(ii)N ame the catalyst used in this reaction. (1)(iii)W hy is a catalyst used? (1)(iv)I f a temperature higher than 450 °C were used, what would happen to the amount of sulfur trioxide produced? Give a reason for your answer.............................................................................................................................................. (2)(v)S uggest a reason why a temperature lower than 450 °C is not used.............................................................................................................................................. (1)0620/43/O/N/16© UCLES 2016(vi)I f a pressure higher than 1–2 atmospheres were used, what would happen to the amount of sulfur trioxide produced? Give a reason for your answer.............................................................................................................................................. (2)stage 3(c) (i)W hat is added to sulfur trioxide to convert it into oleum? (1)(ii)W rite a chemical equation for the conversion of sulfur trioxide into oleum. (1)stage 4(d) (i)W hat is added to oleum to convert it into sulfuric acid? (1)(ii)W rite a chemical equation for the conversion of oleum into sulfuric acid. (1)(e)G ive one use of sulfuric acid. (1)(f)S ulfuric acid reacts with a hydrocarbon called benzene to produce benzenesulfonic acid,C6H5SO3H. Benzenesulfonic acid is a strong acid which ionises to produce hydrogen ions, H+,and benzenesulfonate ions, C6H5SO3–.(i)W hat is meant by the term strong acid? (1)(ii)D escribe how to show that a 1 mol / dm3 solution of benzenesulfonic acid is a strong acid.............................................................................................................................................. (2)(iii)W rite a chemical equation for the reaction between benzenesulfonic acid andsodium carbonate, Na2CO3. (2)[Total: 20]0620/43/O/N/16© UCLES 2016[Turn over0620/43/O/N/16© UCLES 20166 S ynthetic polyamides are made by condensation polymerisation. (a) (i) W hat is meant by the term condensation polymerisation ?............................................................................................................................................. ............................................................................................................................................. ....................................................................................................................................... [3] (ii) Name another type of polymerisation. (1)(b) O ne repeat unit of a synthetic polyamide is represented by the following structure.(i) D raw a ring around the amide link.[1](ii) C omplete the diagrams to show the structures of the monomers used to produce thesynthetic polyamide. Show all the missing atoms and bonds.[2](iii) N ame an example of a synthetic polyamide. (1)(c) P roteins and synthetic polyamides have similarities and differences.(i) N ame the type of compounds that are the monomers used to make up proteins. (1)110620/43/O/N/16© UCLES 2016Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonableeffort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity.To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at after the live examination series.Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.(ii) S tarting with a sample of protein, describe how to produce, separate, detect and identifythe monomers which make it up.Your answer should include • t he name of the process used to break down the protein into its monomers, • t he name of the process used to separate the monomers, • t he method used to detect the monomers after they have been separated, • t he method used to identify the monomers after they have been separated.............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. (4)[Total: 13]PMT120620/43/O/N/16© UCLES 2016G r o u pT h e P e r i o d i c T a b l e o f E l e m e n t s1Hh y d r o g e n12H eh e l i u m4I I I I I II V V V I V I I V I I I3L il i t h i u m 74B eb e r y l l i u m 9a t o m ic n u m b e ra t o m i c s y mb o l K e yn a m er e l a t i v e a t o m i c m a s s 11N as o d i u m 2312M gm a g n e s i u m2419Kp o t a s s i u m 3920C ac a l c i u m 4037R br u b i d i u m 8538S rs t r o n t i u m 8855C sc a e s i u m 13356B ab a r i u m 13787F rf r a n c i u m –88R ar a d i u m –5B b o r o n 1113A l a l u m i n i u m 2731G a g a l l i u m7049I ni n d i u m11581T lt h a l l i u m2046C c a r b o n 1214S i s i l i c o n2832G eg e r m a n i u m7350S nt i n11982P bl e a d20722T i t i t a n i u m 4840Z r z i r c o n i u m 9172H f h a f n i u m 178104R f r u t h e r f o r d i u m –23V v a n a d i u m5141N b n i o b i u m9373T a t a n t a l u m181105D b d u b n i u m–24C r c h r o m i u m 5242M o m o l y b d e n u m 9674W t u n g s t e n 184106S g s e a b o r g i u m –25M n m a n g a n e s e 5543T c t e c h n e t i u m –75R e r h e n i u m 186107B h b o h r i u m –26F e i r o n 5644R u r u t h e n i u m 10176O so s m i u m 190108H s h a s s i u m –27C o c o b a l t 5945R h r h o d i u m 10377I r i r i d i u m 192109M t m e i t n e r i u m –28N i n i c k e l 5946P d p a l l a d i u m 10678P t p l a t i n u m 195110D s d a r m s t a d t i u m–29C u c o p p e r 6447A g s i l v e r 10879A ug o l d197111R gr o e n t g e n i u m–30Z n z i n c 6548C dc ad m i u m11280H gm e r c u r y201112C nc o p e r n i c i u m–114F lf l e r o v i u m–116L vl i v e r m o r i u m–7N n i t r o g e n1415Pp h o s p h o r u s3133A sa r s e n i c7551S ba n t i m o n y12283B ib i s m u t h2098Oo x y g e n1616Ss u l f u r3234S es e l e n i u m7952T et e l l u r i u m12884P op o l o n i u m–9Ff l u o r i n e1917C lc h l o r i n e35.535B rb r o m i n e8053Ii o d i n e12785A ta s t a t i n e–10N en e o n2018A ra r g o n4036K rk r y p t o n8454X ex e n o n13186R nr a d o n–21S c s c a n d i u m 4539Y y t t r i u m 8957–71l a n t h a n o i d s89–103a c t i n o i d s57L al a n t h a n u m 13989A cl a n t h a n o i d sa c t i n o i d sT h e v o l u m e o f o n e m o l e o f a n y g a s i s 24 d m 3 a t r o o m t e m p e r a t u r e a n d p r e s s u r e (r .t .p .).a c t i n i u m –58C e c e r i u m 14090T h t h o r i u m 23259P r p r a s e o d y m i u m14191P a p r o t a c t i n i u m23160N d n e o d y m i u m 14492U u r a n i u m 23861P m p r o m e t h i u m –93N p n e p t u n i u m–62S m s a m a r i u m15094P up l u t o n i u m–63E ue u r o p i u m15295A ma m e r i c i u m–64G dg a d o l i n i u m15796C mc u r i u m–65T bt e r b i u m15997B kb e r k e l i u m–66D yd y s p r o s i u m16398C fc a l i f o r n i um–67H oh o l m i u m16599E se i n s t e i n i u m–68E re r b i u m167100F mf e r m i u m–69T mt h u l i u m169101M dm e n d e l e v i u m–70Y by t t e r b i u m173102N on o b e l i u m–71L ul u t e t i u m175103L rl a w r e n c i u m–PMT。

九天国际教育GCSE真题June 2012 QP - Unit 2 (F) OCR Chemistry (A) GCSE

INSTRUCTIONS TO CANDIDATES •Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters.• Use black ink. HB pencil may be used for graphs and diagrams only.• Answer all the questions.• Read each question carefully. Make sure you know what you have to do before startingyour answer.• Write your answer to each question in the space provided. Additional paper may beused if necessary but you must clearly show your candidate number, centre number and question number(s).• Do not write in the bar RMATION FOR CANDIDATES • Y our quality of written communication is assessed in questions marked with a pencil ( ).• The number of marks is given in brackets [ ] at the end of each question or part question.• The total number of marks for this paper is 60.• This document consists of 24 pages. Any blank pages are indicated.• The Periodic T able is printed on the back page.•A list of qualitative tests for ions is printed on page 2.OCR is an exempt CharityTurn over© OCR 2012 [R/601/7592]DC (SHW 00678 4/11) 49642/4*A 135360612*© OCR 2012TWENTY FIRST CENTURY SCIENCE DATA SHEETQualitative analysisTests for ions with a positive chargeIonTestObservationcalcium Ca 2+add dilute sodium hydroxidea white precipitate forms; the precipitate does not dissolve in excess sodium hydroxide copper Cu 2+add dilute sodium hydroxidea light blue precipitate forms; the precipitate does not dissolve in excess sodium hydroxide iron(II )Fe 2+add dilute sodium hydroxidea green precipitate forms; the precipitate does not dissolve in excess sodium hydroxide iron(III )Fe 3+add dilute sodium hydroxidea red-brown precipitate forms; the precipitate does not dissolve in excess sodium hydroxide zinc Zn 2+add dilute sodium hydroxidea white precipitate forms; the precipitate dissolves in excess sodium hydroxideTests for ions with a negative chargeIonTestObservationcarbonate CO 32−add dilute acidthe solution effervesces; carbon dioxide gas is produced (the gas turns lime water from colourless to milky)chloride C l −add dilute nitric acid,then add silver nitrate a white precipitate forms bromide Br −add dilute nitric acid,then add silver nitrate a cream precipitate forms iodide I −add dilute nitric acid,then add silver nitrate a yellow precipitate formssulfate SO 42−add dilute acid,then add barium chloride or barium nitratea white precipitate formsBLANK PAGEQuestion 1 begins on page 4PLEASE DO NOT WRITE ON THIS PAGETurn over © OCR 2012Answer all the questions.1 Joe watches a DVD that shows how some Group 7 elements react with iron.Joe makes some notes about what he sees.fluorineF Most reactive element in the group. Explosive reaction with iron.chlorineC l Very bright flame, iron burns away quickly.bromineBr Less bright flame, takes longer for reaction with iron to finish.iodineIastatineAt(a)What do Joe’s notes show about the trend in reactivity down Group 7?................................................................................................................................................... (1)(b)The presenter on the DVD talks about the results of the experiments.(i) Use Joe’s notes to predict the reactivity of iodine and astatine............................................................................................................................................ (2)© OCR 2012(ii) Joe writes this in his notes.I think that these results show that the top element in every groupin the Periodic Table is the most reactive.Do you agree with Joe? Explain your answer.................................................................................................................................................................................................................................................................................................................................................................................................................................. (2)[Total: 5]Turn over© OCR 20122 The table shows data about the physical properties of some elements.Element Appearance atroom temperature Melting pointin °CBoiling pointin °CDoes the elementconduct electricity?Chlorine green gas–101–34noBromine red-brown liquid–7 59noIodine dark grey solid114184noLithium shiny solid1801342yesSodium shiny solid97.8883yesPotassium shiny solid63.5759yesMendeleev put these elements into two groups in the Periodic T able.He used their similarities and differences to put lithium, sodium and potassium in one group.He put chlorine, bromine and iodine into another group.Discuss which data in the table support, and which data do not support, Mendeleev’s idea of organising these elements into the two groups.T he quality of written communication will be assessed in your answer. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .. (6)[Total: 6]© OCR 2012Turn over© OCR 20123The diagram shows the arrangement of electrons in an atom of lithium and an atom of fluorine.lithiumfluorine(a) The electron arrangement of the lithium atom is 2.1.What is the electron arrangement of the fluorine atom?electron arrangement = (1)(b) Sodium has eleven electrons.Complete the diagram to show the arrangement of all of the electrons in a sodium atom.sodium[1](c) Another element is in the same group of the Periodic T able as fluorine. It has the electron arrangement 2.8.7. What is the name of this element?Use the Periodic T able to help you.name of element (1)(d) Give the names of the two particles found in the nucleus of an atom...................................................................and . (1)[Total: 4]4 Eve does an experiment with chlorine.She reacts chlorine with a metal. The reaction makes sodium chloride.(a)(i) Write a word equation for the reaction. (2)Before Eve does her experiment, she looks at the hazard warning sign for chlorine gas.(ii)Eve needs to use safety precautions when she uses chlorine in her experiment.Describe these safety precautions and explain why they are necessary............................................................................................................................................ (2)Sea salt contains both sodium chloride and potassium chloride.(b)Which of the following statements about potassium chloride are true and which are false?Put a tick (✓) in the correct box for each statement.true falsePotassium chloride gives a coloured flame in a flame test.Potassium chloride is a gas.Potassium chloride can be made by reacting potassium with bromine.Solid potassium chloride contains sodium ions and chloride ions.[2][Total: 6]© OCR 2012BLANK PAGEQuestion 5 begins on page 10PLEASE DO NOT WRITE ON THIS PAGETurn over © OCR 2012© OCR 20125Amy and Zak test samples of the same solution of a salt.AmyZakThey do tests to identify the positive metal ions and the negative ions in the solution. They use a fresh sample for each test.They both use dilute sodium hydroxide and dilute silver nitrate to test the solution.The boxes show the tests they use and their notes.Amy’s notesTests NotesTest 1Add a few drops of dilute sodium hydroxide.I think thesolution contains calcium ions.Test 2Acidify and add dilute silver nitrate.I think thesolution contains chloride ions.My conclusionThe solution contains calcium chloride .Zak’s notesTests NotesTest 1Add a few drops of dilute sodium hydroxide……then add more dilute sodium hydroxide.I think thesolution contains zinc ions.Test 2Acidify and add dilute silver nitrate.I think thesolution contains chloride ions.My conclusionThe solution contains zinc chloride .Amy and Zak both agree that the salt is a chloride but disagree about the metal ion in the salt. Use the data sheet on page 2 to help you work out what Amy and Zak saw when they did the tests. Explain how what they saw led them to their conclusions and who is more likely to be correct.T he quality of written communication will be assessed in your answer. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .. (6)[Total: 6]6 Massicot is a mineral. It contains lead oxide, PbO.Lead metal is extracted from massicot. Lead is needed for roofing and car batteries.Jed and Kay live near a lead mine.The mass of lead that can be extracted from massicot can be worked out using relative atomic (a)masses.(i) Use the Periodic T able to find the relative atomic masses of lead and oxygen.relative atomic mass of lead = .....................relative atomic mass of oxygen = (1)(ii) Use your answers to work out the relative formula mass of lead oxide, PbO.relative formula mass of PbO = (1)The lead mine produces millions of tonnes of lead ore.(b)Jed and Kay are talking about the advantages and disadvantages of living near the lead mine.(i) Kay has just moved into the area. She has a young family.Give one advantage and one disadvantage to Kay of living near a lead mine....................................................................................................................................................................................................................................................................................... (2)(ii) Jed and Kay talk about lead processing at the mine.Suggest reasons that Kay could give for not closing the mine.................................................................................................................................................................................................................................................................................................................................................................................................................................. (2)[Total: 6]7 Aluminium is extracted from its ore by electrolysis.Aluminium ore contains aluminium oxide.(a) This is the word equation for the reaction.aluminium oxidealuminium + oxygenThe aluminium oxide is reduced. What does this mean?Put a tick (✓) in the box next to the correct answer.The aluminium oxide loses oxygen.The density of the aluminium oxide decreases.The aluminium oxide loses energy.The volume of the aluminium oxide decreases.[1](b) The electrolysis process uses molten aluminium oxide.The diagram shows the arrangement of particles in molten aluminium oxide.A l 3+O 2–O 2–O 2–O 2–O 2–O 2–A l 3+A l 3+A l 3+O 2–O 2–O 2–A l 3+A l 3+O 2–O 2–O 2–A l 3+A l 3+A l 3+O 2–O 2–O 2–A l 3+(i) Which two words can be used to describe molten aluminium oxide?Put rings around the two correct answers.covalent gas ionic liquid molecular solid[2](ii) During the electrolysis, negative ions move to the positive electrode and positive ions move to the negative electrode. A product is made at each electrode.Draw straight lines to connect each electrode with the correct product made.electrode product madealuminiumaluminium oxidepositive electrodewaternegative electrodehydrogenoxygen[2]Aluminium has many different uses.(c)The uses of aluminium depend on making the best use of its properties.Draw four straight lines to connect each use with the most important reason for that use.use most important reasonaircraft parts low density and can be mixed with other metals to make it strong power cables shiny appearance and surface can be coloured using dyes drinks and food cans surface is non-toxic and does not react with dilute acids jewellery very good electrical conductivity and can be shaped into wires[2][Total: 7]8Sue reacts copper carbonate with a dilute acid to make copper chloride.dilute acidcopper carbonate(a)Complete the word and symbol equations for the reaction by filling in the empty boxes.copper carbonate+copper chloride+carbon dioxide+CuCO 3+2HClCuC l 2+CO 2+[2](b) Which other chemicals react with the same dilute acid to form copper chloride?Put rings around the two correct answers.copper hydroxide copper nitrate copper oxide copper sulfate[1](c)Sue adds solid copper carbonate to the dilute acid until no more solid reacts.At the end of the experiment, the beaker contains copper chloride solution and some left-over solid copper carbonate.copper chloride solutionsolid copper carbonateHow can Sue make some pure, dry copper chloride crystals from the mixture in the beaker?The quality of written communication will be assessed in your answer............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ (6)(d)Sue measures the mass of crystals that she has made (her actual yield).Sue weighs an empty dish.She puts her crystals into the dish and weighs it again.These are her results.mass of empty dish = 200.0 gmass of dish and crystals = 204.5 g(i) What is the mass of the crystals (the actual yield)?mass = ..................................................... g [1] (ii) The theoretical yield for Sue’s experiment is5.0 g.Sue knows thatpercentage yield =actual yield theoretical yield×100%Use the actual yield from part (i) to calculate a percentage yield for Sue’s experiment.percentage yield = .................................................... % [1][Total: 11]9 Alex adds zinc to some dilute sulfuric acid.He measures the volume of hydrogen gas given off every 30 seconds. (a)Draw straight lines to connect each chemical to its correct formula.chemical formulahydrogen H2SO4zinc Znsulfuric acid H2[2](b)What is the name of the salt that forms in the reaction between zinc and sulfuric acid?Put a ring around the correct answer.zinc chloride zinc hydroxide zinc nitrate zinc oxide zinc sulfate[1](c)Alex thinks that the reaction is too slow.He does not want to change the mass of the zinc.Suggest two ways that Alex could make the reaction faster.................................................................................................................................................... (2)(d) Alex measures the volume of hydrogen in the gas syringe for 5 minutes.He plots his results on a graph.50010201234time in minutesvolume ofgas in cm 3(i) Which statement is the best description of what is happening at the start of the reaction?Put a tick (✓) in the box next to the correct answer.No reaction ishappening.The reaction rate is at its fastest.The reaction is slow but getting faster.The reaction is happening at a constant rate.[1](ii) Which statement is the best description of what is happening after 5 minutes?Put a tick (✓) in the box next to the correct answer.The reaction hasstopped.The reaction rate is at its fastest.The reaction is increasing in rate.Gas is being given off at a constant rate.[1](e)Alex measures the pH of the contents of the flask at the start and at the end of the reaction.The pH is very low at the start and increases during the reaction.Why does the pH change in this way?................................................................................................................................................... (2)[Total: 9]END OF QUESTION PAPERBLANK PAGEPLEASE DO NOT WRITE ON THIS PAGEPLEASE DO NOT WRITE ON THIS PAGECopyright InformationOCR is committed to seeking permission to reproduce all third-party content that it uses in its assessment materials. OCR has attempted to identify and contact all copyright holders whose work is used in this paper. T o avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced in the OCR Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download from our public website () after the live examination series.If OCR has unwittingly failed to correctly acknowledge or clear any third-party content in this assessment material, OCR will be happy to correct its mistake at the earliest possible opportunity.For queries or further information please contact the Copyright Team, First Floor, 9 Hills Road, Cambridge CB2 1GE.OCR is part of the Cambridge Assessment Group; Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.T h e P e r i o d i c T a b l e o f t h e E l e m e n t s* T h e l a n t h a n o i d s (a t o m i c n u m b e r s 58-71) a n d t h e a c t i n o i d s (a t o m i c n u m b e r s 90-103) h a v e b e e n o m i t t e d .T h e r e l a t i v e a t o m i c m a s s e s o f c o p p e r a n d c h l o r i n e h a v e n o t b e e n r o u n d e d t o t h e n e a r e s t w h o l e n u m b e r .12345670K e y1H h y d r o g e n 14H eh e l i u m27L il i t h i u m39B eb e r y l l i u m4r e l a t i v e a t o m i c m a s s a t o m i c s y m b o ln a m e a t o m i c (p r o t o n ) n u m b e r 11Bb o r o n512Cc a r b o n614N n i t r o g e n716O o x y g e n819Ff l u o r i n e 920N en e o n1023N as o d i u m1124M gm a g n e s i u m1227A la l u m i n i u m1328S i s i l i c o n1431P p h o s p h o r u s 1532S s u l f u r 1635.5C lc h l o r i n e 1740A ra r g o n1839Kp o t a s s i u m1940C ac a l c i u m2045S cs c a n d i u m2148T it i t a n i u m2251Vv a n a d i u m2352C rc h r o m i u m2455M n m a n g a n e s e 2556F ei r o n2659C o c o b a l t 2759N i n i c k e l 2863.5C uc o p p e r 2965Z n z i n c 3070G ag a l l i u m3173G eg e r m a n i u m 3275A sa r s e n i c 3379S es e l e n i u m 3480B rb r o m i n e 3584K rk r y p t o n3685R br u b i d i u m3788S rs t r o n t i u m3889Yy t t r i u m3991Z rz i r c o n i u m4093N bn i o b i u m4196M om o l y b d e n u m42[98]T c t e c h n e t i u m 43101R ur u t h e n i u m44103R hr h o d i u m 45106P dp a l l a d i u m46108A gs i l v e r 47112C dc ad m i u m48115I ni n d i u m 49119S nt i n50122S ba n t i m o n y51128T et e l l u r i u m52127Ii o d i n e53131X ex e n o n54133C sc a e s i u m55137B ab a r i u m56139L a *l a n t h a n u m57178H fh a f n i u m72181T at a n t a l u m73184Wt u n g s t e n74186R er h e n i u m75190O so s m i u m76192I ri r i d i u m 77195P tp l a t i n u m78197A ug o l d79201H gm e r c u r y 80204T l t h a l l i u m 81207P bl e a d82209B ib i s m u t h83[209]P op o l o n i u m 84[210]A ta s t a t i n e85[222]R nr a d o n86[223]F rf r a n c i u m 87[226]R ar a d i u m 88[227]A c *a c t i n i u m 89[261]R f r u t h e r f o r d i u m104[262]D bd u b n i u m105[266]S gs e a b o r g i u m106[264]B hb o h r i u m 107[277]H sh a s s i u m 108[268]M t m e i t n e r i u m109[271]D sd a r m s t a d t i u m110[272]R g r o e n t g e n i u m111E l e m e n t s w i t h a t o m i c n u m b e r s 112-116 h a v e b e e n r e p o r t e d b u t n o t f u l l y a u t h e n t i c a t e d。

九天国际教育GCSE真题Specimen QP - Paper 4 CIE Chemistry IGCSE

PMTCambridge International Examinations Cambridge International General Certificate of Secondary Education*0123456789*CHEMISTRY Paper 4 Theory (Extended) SPECIMEN PAPER0620/04For Examination from 2016 1 hour 15 minutesCandidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. A copy of the Periodic Table is printed on page 20. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question.The syllabus is accredited for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.This document consists of 18 printed pages and 2 blank pages.© UCLES 2014[Turn overPMT2 1 The following table gives information about six substances. melting point / °C 839 –188 776 –117 1607 –5 boiling point / °C 1484 –42 1497 78 2227 102 electrical conductivity as a solid good poor poor poor poor poor electrical conductivity as a liquid good poor good poor poor goodsubstance A B C D E F(a) Which substance could be a metal? [1](b) State all the substances that are liquid at room temperature? [1] (c) Which substance could have a macromolecular structure similar to that of silicon(IV) oxide? [1](d) Which substance could be propane? [1](e) Which substance could be sodium chloride? [1] [Total: 5]© UCLES 20140620/04/SP/16PMT3 2 The table gives the composition of three particles. number of protons 15 15 15 number of electrons 15 18 15 number of neutrons 16 16 17particle A B C(a) What is the evidence in the table for each of the following? (i) Particle A is an atom.[1] (ii) A, B and C are all particles of the same element.[1] (iii) Particles A and C are isotopes of the same element.[2](b) (i) What is the electronic structure of particle A? [1] (ii) Is element A, a metal or a non-metal? Give a reason for your choice.[1] [Total: 6]© UCLES 20140620/04/SP/16[Turn overPMT4 3 Kinetic theory explains the properties of matter in terms of the arrangement and movement of particles. (a) Nitrogen is a gas at room temperature. Nitrogen molecules, N2, are spread far apart and move in a random manner at high speed. (i) Draw the electronic structure of a nitrogen molecule. Show only the outer electron shells.[2] (ii) Compare the movement and arrangement of the molecules in solid nitrogen to those in nitrogen gas.[3](b) A sealed container contains nitrogen gas. The pressure of the gas is due to the molecules of the gas hitting the walls of the container. Use the kinetic theory to explain why the pressure inside the container increases when the temperature is increased.[2]© UCLES 20140620/04/SP/16PMT5 The following apparatus can be used to measure the rate of diffusion of a gas.constant pressure applied gas syringe gasmetal foil, gas escapes through small hole in foilThe following results were obtained. temperature / °C 25 25 50 rate of diffusion in cm3 / min 1.00 0.63 1.05gas nitrogen chlorine nitrogen(c) (i) Explain why nitrogen gas diffuses faster than chlorine gas.[2] (ii) Explain why the nitrogen gas diffuses faster at the higher temperature. [1] [Total: 10]© UCLES 20140620/04/SP/16[Turn overPMT6 4 Chromium is a transition element. (a) (i) State two differences in the physical properties of chromium and sodium.[2] (ii) State two differences in the chemical properties of chromium and sodium.[2](b) Chromium is used to electroplate steel objects. The diagram shows how this could be done.+ –lead anode chromium(III) sulfate(aq)object to be plated(i) Give two reasons why steel objects are plated with chromium.[2] (ii) The formula of the chromium(III) ion is Cr3+ and of the sulfate ion is SO42–. Give the formula of chromium(III) sulfate. [1] (iii) Write the ionic half-equation for the reaction at the negative electrode (cathode). [2] (iv) A colourless gas, which relights a glowing splint, is formed at the positive electrode (anode). State the name of this gas. [1]© UCLES 20140620/04/SP/16PMT7 (v) During electroplating, it is necessary to add more chromium(III) sulfate but during copper plating using a copper anode, it is not necessary to add more copper(II) sulfate. Explain this difference.[2] [Total: 12]© UCLES 20140620/04/SP/16[Turn overPMT8 5 Iron is extracted from its ore, hematite, in the blast furnace.waste gasesfirebrick lining: raw materials: coke, C iron ore, Fe2O3 limestone, CaCO3air slag molten ironDescribe the reactions involved in this extraction. Include one equation for a redox reaction and one for an acid/base reaction.[5] [Total: 5]© UCLES 20140620/04/SP/16PMT9 BLANK PAGE© UCLES 20140620/04/SP/16[Turn overPMT10 6 Soluble salts can be made using a base and an acid. (a) Complete this method of preparing dry crystals of the soluble salt cobalt(II) chloride-6-water from the insoluble base cobalt(II) carbonate. step 1 Add an excess of cobalt(II) carbonate to hot dilute hydrochloric acid. step 2step 3step 4[4]© UCLES 20140620/04/SP/16PMT11 (b) (i) 5.95 g of cobalt(II) carbonate were added to 40 cm3 of hydrochloric acid, concentration 2.0 mol / dm3. Calculate the maximum yield of cobalt(II) chloride-6-water and show that the cobalt(II) carbonate was in excess. CoCO3 + 2HCl → CoCl2 + CO2 + H2O CoCl2 + 6H2O → CoCl2.6H2O maximum yield: number of moles of HCl used = ………………………………………………...…..……. number of moles of CoCl2 formed = ……………………………………………..….…… number of moles of CoCl2.6H2O formed = ………………………………………..…..… mass of one mole of CoCl2.6H2O = 238 g maximum yield of CoCl2.6H2O = …………………………………………………..…..… g to show that cobalt(II) carbonate is in excess: number of moles of HCl used = ……………………….……… (use your value from above) mass of one mole of CoCO3 = 119 g number of moles of CoCO3 in 5.95 g of cobalt(II) carbonate = ………………………… [5] (ii) Explain how these calculations show that cobalt(II) carbonate is in excess. [1] [Total: 10]© UCLES 20140620/04/SP/16[Turn overPMT12 7 Iodine reacts with chlorine to form dark brown iodine monochloride. I2 + Cl2 → 2ICl This reacts with more chlorine to give yellow iodine trichloride. An equilibrium forms between these iodine chlorides. ICl(l) + Cl2(g) =⇌ ICl3(s) dark brown yellow (a) What do you understand by the term equilibrium?[2](b) When the equilibrium mixture is heated, it becomes a darker brown colour. Suggest if the reverse reaction is endothermic or exothermic. Give a reason for your choice.[1](c) The pressure on the equilibrium mixture is decreased. (i) How would this affect the position of equilibrium? Give a reason for your choice. It would move to the reason [1] (ii) Describe what you would observe.[1]© UCLES 20140620/04/SP/16PMT13 (d) Calculate the overall energy change for the reaction between iodine and chlorine using the bond energy values shown. I2 + Cl2 → 2ICl Bond I–I Cl – Cl I – Cl Show your working. Energy / kJ per mol 151 242 208[3](e) Draw a labelled energy level diagram for the reaction between iodine and chlorine using the information in (d).[2] [Total: 10]© UCLES 20140620/04/SP/16[Turn overPMT14 8 The alcohols form an homologous series. (a) Give three characteristics of an homologous series.[3](b) The following two alcohols are members of an homologous series and they are isomers. CH3 ― CH2 ― CH2 ― CH2 ― OH and (CH3)2CH ― CH2 ― OH (i) Explain why they are isomers.[2] (ii) Deduce the structural formula of another alcohol which is also an isomer of these alcohols.[1]© UCLES 20140620/04/SP/16PMT15 (c) Copper(II) oxide can oxidise butanol to liquid X, whose pH is 4.mineral wool soaked in butanol copper(II) oxideheat liquid X formed by oxidation of butanol.(i) Give the name of another reagent which can oxidise butanol. [1] (ii) Which homologous series does liquid X belong to? [1] (iii) State the formula of liquid X. [1]© UCLES 20140620/04/SP/16[Turn overPMT16 (d) The alcohol ethanol can be made by fermentation. Yeast is added to aqueous glucose. C6H12O6(aq) → 2C2H5OH(aq) + 2CO2(g) Carbon dioxide is given off and the mixture becomes warm, as the reaction is exothermic. The graph shows how the rate of reaction varies over several days.rate of reactiontime(i) Suggest a method of measuring the rate of this reaction.[2] (ii) Why does the rate initially increase?[1] (iii) Suggest two reasons why the rate eventually decreases.[2] [Total: 14]© UCLES 20140620/04/SP/16PMT17 BLANK PAGE© UCLES 20140620/04/SP/16[Turn overPMT18 9 There are two types of polymerisation, addition and condensation. (a) Explain the difference between these two types of polymerisation.[2](b) Some plastics, formed by polymerisation, are non-biodegradable. Describe two pollution problems that are caused by non-biodegradable plastics.[2]© UCLES 20140620/04/SP/16PMT19 (c) The polymer known as PVA is used in paints and adhesives. Its structural formula is shown below. ―CH2―CH―CH2―CH― │ │ OCOCH3 OCOCH3 Deduce the structural formula of its monomer.[1](d) A condensation polymer can be made from the following monomers. HOOC(CH2)4COOH and H2N(CH2)6NH2 Draw the structural formula of this polymer.[3] [Total: 8]© UCLES 20140620/04/SP/16PMT20Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.© UCLES 20140620/04/SP/16。

九天国际教育GCSE真题Specimen QP - Paper 2 CIE Chemistry IGCSE

The syllabus is accredited for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.This document consists of 18 printed pages.© UCLES 2014[Turn over*0123456789*Cambridge International ExaminationsCambridge International General Certificate of Secondary EducationCHEMISTRY0620/02Paper 2 Multiple Choice (Extended) For Examination from 2016SPECIMEN PAPER45 minutesAdditional Materials: Multiple Choice Answer Sheet Soft clean eraserSoft pencil (type B or HB is recommended)READ THESE INSTRUCTIONS FIRSTWrite in soft pencil.Do not use staples, paper clips, glue or correction fluid.Write your name, Centre number and candidate number on the Answer Sheet in the spaces provided unless this has been done for you.DO NOT WRITE IN ANY BARCODES.There are forty questions on this paper. Answer all questions. For each question there are four possible answers A , B , C and D .Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet.Read the instructions on the Answer Sheet very carefully.Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 18. Electronic calculators may be used.1Amino acids are colourless and can be separated and identified by chromatography.paperWhat additional apparatus is required to identify the amino acids present in a mixture?A a locating agentB a rulerC a ruler and a locating agentD neither a ruler or a locating agent2The diagram shows the diffusion of hydrogen chloride and ammonia in a glass tube.The gases are given off by the solutions at each end of the tube.When hydrogen chloride and ammonia mix they produce a white solid, ammonium chloride.Which line shows where the white solid is formed?concentrated ammoniasolutionconcentrated hydrochloric acid© UCLES 2014 0620/02/SP/16© UCLES 2014 0620/02/SP/16[Turn over3 The diagram shows the structure of an atom.+key= proton = neutron = electronnWhich diagram shows the structure of an isotope of this atom?ABCD4 The table shows the structure of different atoms and ions.particleproton numbernucleon numbernumber of protonsnumber of neutronsnumber of electronsMg 12 24 12 W 12 Mg 2+ X 24 12 12 10 F 9 19 9 Y 9 F –9 19 9 10 ZWhat are the values of W, X, Y and Z?W X Y Z A 10 10 9 9 B 10 12 10 9 C 12 10 9 10 D 12 12 10 10© UCLES 20140620/02/SP/165 Iron is a metal. The structure of iron is described as a lattice of positive ions in a sea of electrons. Which of the following statements about iron are correct? 1 iron conducts electricity because the electrons are free to move 2 iron has a high melting point due to the strong covalent bonds 3 iron is an alloy 4 iron is malleable because the layers of atoms can slide over one anotherA 1 onlyB 1 and 3C 1 and 4D 2, 3 and 46 Which two elements react together to form an ionic compound?element electronic structure R T X Z2,4 2,8 2,8,1 2,8,7A R and TB T and XC X and ZD Z and R7 Ethene is an unsaturated hydrocarbon.HHHH C CWhich description of the bonding in ethene is correct?A All atoms in the molecule have a share of eight electrons.B Eachcarbon atom shares two of its electrons with hydrogen atoms and two of its electronswith a carbon atom. C Each carbon atom shares two of its electrons with hydrogen atoms and one of its electronswith a carbon atom. D The two carbon atoms share a total of six electrons with other atoms.8 What is the relative molecular mass, M r , of butanol? A 15 B 37 C 74 D 148© UCLES 2014 0620/02/SP/16[Turn over9 The chemical formulae of two substances, W and X, are given.W NaA l Si 3O 8X CaA l 2Si 2O 8 Which statements are correct? 1 W and X contain the same amount of oxygen. 2 W contains three times as much silicon as X. 3 X contains twice as much aluminium as W. A 1 and 2 B 1 and 3 C 2 and 3 D 1, 2 and 310 What is the concentration of a solution containing 1.0 g of sodium hydroxide in 250 cm 3 ofsolution?A 0.025 mol / dm 3B 0.10 mol / dm 3C 0.25 mol / dm 3D 1.0 mol / dm 311 Four students prepared hydrated copper(II ) sulfate by adding an excess of dilute sulfuric acid tocopper(II ) oxide. Each student used a different mass of copper(II ) oxide.dilute sulfuric acidCuOCuSO 4.5H 2O M r = 80 M r = 250After the copper(II ) sulfate had crystallised the students dried and weighed the crystals.Which student produced the highest percentage yield of hydrated copper(II ) sulfate?mass of copper(II ) oxide used / gmass of crystals produced / gA 4.0 11.5B 8.0 23.5C 12.0 35.0D 16.0 46.5© UCLES 2014 0620/02/SP/16cm 3 of ethyne, C 2H 2, are reacted with 500cm 3 of oxygen. The equation for the reaction is2C 2H 2(g) + 5O 2(g) → 4CO 2(g) + 2H 2O(l)What is the total volume of gas remaining at the end of the reaction? (all volumes are measured at room temperature and pressure)A 400 cm 3B 450 cm 3C 490 cm 3D 520 cm 313 Different metals were tested using the apparatus shown.Which pair of metals would produce the largest voltage? A copper and silver B magnesium and silver C magnesium and zinc D zinc and copper14 Three electrolysis cells are set up. Each cell has inert electrodes. The electrolytes are listed below. cell 1 aqueous sodium chloride cell 2 dilute sulfuric acidcell 3molten lead(II ) bromideIn which of these cells is a gas formed at both electrodes? A 1 and 2B 1 and 3C 2 onlyD 3 only© UCLES 2014 0620/02/SP/16[Turn over15 The statements refer to the electrolysis of concentrated copper(II ) chloride solution. 1 Electrons are transferred from the cathode to the copper(II ) ions. 2 Electrons move around the circuit from the cathode to the anode. 3 Chloride ions are attracted to the anode. 4 Hydroxide ions transfer electrons to the cathode. Which statements about the electrolysis of concentrated copper(II ) chloride are correct?A 1 and 3B 1 and 4C 2 and 3D 2 and 416 Water can be used to produce hydrogen gas.2H 2O → 2H 2 + O 2Which row describes bond breaking in the reactant?A B C Dendothermic endothermic exothermic exothermicheat absorbed heat released heat absorbed heat released17 Dinitrogen tetroxide, N 2O 4, breaks down into nitrogen dioxide, NO 2.N 2O 4(g) ⇌ 2NO 2(g)The reaction is reversible and endothermic. Which conditions will give the largest yield of nitrogen dioxide, NO 2?temperaturepressureA B C D high high low lowhigh low high low© UCLES 2014 0620/02/SP/16For which two reactions would this apparatus be suitable?reaction 1 AgNO 3(aq) + HC l (aq) → AgC l (s) + HNO 3(aq)reaction 2 2H 2O 2(aq) → 2H 2O(I) + O 2(g) reaction 3 MgO(s) + 2HC l (aq) → MgC l 2(aq) + H 2O(I)reaction 4 ZnCO 3(s) + 2HC l (aq) → ZnC l 2(aq) + CO 2(g) + H 2O(I)A 1 and 2B 1 and 3C 2 and 4D 3 and 419 A student investigates the rate of reaction between magnesium and excess sulfuric acid. The volume of hydrogen given off in the reaction is measured over time. The graph shows the results of two experiments, R and S.volume of hydrogen given offtimeWhich change in conditions would cause the difference between R and S? A A catalyst is added in S.B The acid is more concentrated in R than in S.C The magnesium is less finely powdered in R than in S.D The temperature in R is lower than in S.20 Which of these reactions shows only reduction?A Cu2+ + 2e– CuB Fe2O3 + 3CO 2Fe + 3CO2C HC l + NaOH NaC l + H2OD Mg + ZnSO4 Zn + MgSO421The red colour in some pottery glazes may be formed as a result of the reactions shown.CuCO3CuO + CO2CuO + SnO Cu + SnO2These equations show that ......1...... is oxidised and ......2...... is reduced.Which substances correctly complete gaps 1 and 2 in the above sentence?1 2A B C DCO2CuCO3CuOSnOSnO2CuOSnOCuO22Acids are compounds which donate protons (hydrogen ions).NH3(aq) + H2O(l) → NH4+(aq) + OH–(aq)Which compound in this equation is behaving as an acid?A ammoniaB ammonium hydroxideC none of themD water© UCLES 2014 0620/02/SP/16 [Turn over© UCLES 2014 0620/02/SP/1623 The reactions of four different oxides W, X, Y and Z are shown. W reacts with hydrochloric acid but not sodium hydroxide. X reacts with both hydrochloric acid and sodium hydroxide. Y does not react with either hydrochloric acid or sodium hydroxide. Z reacts with sodium hydroxide but not hydrochloric acid. Which row shows the correct types of oxide?acidic basic amphoteric neutral A B C DW X Z ZZ Y X WX W Y XY Z W Y24 A solution contains barium ions and silver ions and one type of anion. What could the anion be? A chloride only B nitrate onlyC sulfate onlyD chloride or nitrate or sulfate25A mixture containing two anions was tested and the results are shown below.test resultdilute nitric acid addedeffervescence of a gas whichturned limewater milkydilute nitric acid added, followed by aqueous silver nitrateyellow precipitate formed Which anions were present? A carbonate and chloride B carbonate and iodide C sulfate and chloride D sulfate and iodide26 Part of the Periodic Table is shown. The letters are not the chemical symbols of the elements.W ZYXWhich statement about the elements is not correct. A W has two electrons in the outermost shell. B Y is in Group IV of the Periodic Table.C X and Y bond covalently to form a molecule XY 4.D Z has more metallic character than Y.27 Astatine is an element in Group VII of the Periodic Table. It has only ever been produced in verysmall amounts. What are the likely properties of astatine?colour statereaction with aqueouspotassium iodideA B C D black dark brown green yellowsolid gas solid liquidno reaction brown colour no reaction brown colourmetal dilute hydrochloric acidwaterP Q Rhydrogen producedno reactionhydrogen producedhydrogen producedno reactionno reactionWhat is the order of reactivity of the metals?most reactiveleast reactiveA B C DP P R RR Q Q PQ R P Q29 Compound X is heated with carbon using the apparatus shown.carbonA brown solid is formed in the reaction tube and the limewater turns cloudy. What is compound X? A calcium oxideB copper(II ) oxideC magnesium oxideD sodium oxide30 Zinc is extracted from zinc blende.Zinc blende is an ore of zinc and consists mainly of zincsulfide.One of the steps in the process involves zinc sulfide reacting with oxygen from the air.What is the equation for this reaction?A 2ZnS + 3O2→ 2ZnO + 2SO2B 2ZnS + O2→ 2Zn + SO2C 2ZnS + O2→ 2ZnO + SD ZnS + 2O2→ ZnSO431The diagram shows the carbon cycle.Which process is shown by the arrow marked X?A combustionB photosynthesisC respirationD transpiration32 A catalytic converter removes harmful gases from motor car exhausts.doesnot take place in a catalytic converter?WhichreactionA 2CO + O2→ 2CO2B N2 + 2CO2→ 2NO + 2COC 2NO2→ N2 + 2O2D 2NO2 + 4CO → N2 + 4CO233The diagram shows some reactions of substance Y.heat with an Arraydilute acidWhich type of substance is Y?A an alcoholB a baseC a catalystD a metal34Which row shows the conditions for the manufacture of sulfuric acid?pressure/atm temperature/°C catalystA B C D22200200450250450250vanadium(V) oxideironironvanadium(V) oxide35Air containing an acidic impurity was neutralised by passing it through a column containing substance X.acidic airneutralised airWhat is substance X?A calcium oxideB sandC sodium chlorideD concentrated sulfuric acid36 In an oil refinery, petroleum is separated into useful fractions. The diagram shows some of these fractions.refinery gases gasoline Xdiesel oil YZWhat are fractions X, Y and Z?X Y ZA B C Dfuel oil fuel oil paraffin (kerosene) paraffin (kerosene)bitumen paraffin (kerosene)bitumen fuel oilparaffin (kerosene)bitumen fuel oil bitumen37 Which reaction does not take place in the dark? A CH 4 + 2O 2 → CO 2 + 2H 2O B CH 4 + C l 2 → CH 3C l + HC l C C 2H 4 + H 2O → C 2H 5OH D C 2H 4 + H 2 → C 2H 638Ethane and ethene are both hydrocarbons.Ethane reacts with chlorine and ethene reacts with bromine.Which row describes the type of reaction that ethane and ethene undergo?ethane ethene A B C Daddition addition substitution substitutionaddition substitution substitution addition39Esters are made by reacting an alcohol with a carboxylic acid. Which acid and alcohol react together to form the following ester?3CH 3CH 2CA propanoic acid and ethanolB propanoic acid and methanolC ethanoic acid and ethanolD ethanoic acid and methanol40 Which structure represents a polymer?ABCDPe rmission to re produce ite ms whe re third-party owne d mate rial prote cte d by copyright is include d has be e n sought and cle are d whe re possible. Eve ry reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity.Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.。

九天国际教育GCSE真题June 2014 QP - Unit 1 (H) OCR Chemistry (A) GCSE

INSTRUCTIONS TO CANDIDATES •Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters.• Use black ink. HB pencil may be used for graphs and diagrams only.• Answer all the questions.• Read each question carefully. Make sure you know what you have to do before startingyour answer.• Write your answer to each question in the space provided. Additional paper may beused if necessary but you must clearly show your candidate number, centre number and question number(s).• Do not write in the bar RMATION FOR CANDIDATES • The quality of written communication is assessed in questions marked with a pencil ( ).• The Periodic T able is printed on the back page.• The number of marks is given in brackets [ ] at the end of each question or part question.• The total number of marks for this paper is 60.•This document consists of 24 pages. Any blank pages are indicated.OCR is an exempt CharityTurn over© OCR 2014 [K/601/7548]DC (AC/SW) 74821/5*1202760481*© OCR 2014Answer all the questions.1 Sulfur dioxide is an air pollutant.The graph shows the amount of sulfur dioxide put into the air from 1990 to 2010 in the UK.19901995200020052010sulfur dioxidein millions of tonnesyear(a) (i) What was the amount of sulfur dioxide put into the air in 2010 as a fraction of that in2000?answer = .......................................................... [1] (ii) The Government says that the amount of sulfur dioxide put into the air falls to a thirdevery 10 years since 1990.Is this true? Justify your answer............................................................................................................................................ ........................................................................................................................................... ........................................................................................................................................... . (2)Turn over© OCR 2014Most sulfur dioxide in the air comes from power stations.This graph shows the number of coal-fired power stations in the UK between 1990 and 2010.yearnumber of coal-fired power stations(b) Look at the two graphs.What is the correlation shown by the data? (2)(c)Power stations can also burn natural gas.The amount of sulfur dioxide put into the air is lowered by removing sulfur from natural gas.Sulfur is removed from molecules in natural gas by reacting them with hydrogen.The diagram shows this type of reaction.(i) Complete this diagram to show the correct number of hydrogen and hydrogen sulfidemolecules.a moleculewith sulfur atomshydrogen methane hydrogen sulfide[2](ii) The flow scheme shows the process of removing sulfur from natural gas.natural gas andoxygen sulfur atomsStage 2 converts hydrogen sulfide into water and sulfur.Suggest why stage 2 is necessary.................................................................................................................................................................................................................................................................................................................................................................................................................................. (2)[Total: 9]© OCR 2014Turn over© OCR 20142 (a) Dom and Kate live in a town that has bus lanes. Only buses can drive in bus lanes. This means that at busy times buses travel faster thancars.Buses and cars make carbon dioxide and other pollutants when they burn fuel.Dom says there will be less air pollution as more people will travel by bus.Kate says there will be more air pollution as a bus burns more fuel than a car. Who is correct and why?The quality of written communication will be assessed in your answer ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................[6](b)Biofuels may be used to run buses instead of fuels from crude oil.Suggest a reason for using biofuel. Explain your answer.......................................................................................................................................................................................................................................................................................................................................................................................................................................................... (2)A fuel is burned to make only carbon dioxide and water.(c)What does this tell you about the elements in the fuel and the conditions in which the fuel burns?......................................................................................................................................................................................................................................................................................................................................................................................................................................................... (2)Which term describes the changes to the elements in the fuel as it burns?(d)Put a ring around the correct answer.carbonised electrolysed neutralised oxidised reduced [1][Total: 11]© OCR 2014Turn over© OCR 20143 A supermarket uses plastic carrier bags.The handles of some of a new set of bags break when customers carry their shopping away.The supermarket complains to the company that makes the bags. The company tests 5 of the new set of bags. They find the mass that will break each bag.Here are their measurements.Bag number12345Mass to break handle in kg6.58.26.110.29.0(a) (i) Use all their measurements to find the mean value of the mass to break the handles. Show your working.answer = ..................................................... kg [2](ii) The company compare the data for the old and new sets of bags.Old set of bags New set of bagsMean value of mass to break the handles in kg 14.5Range of values of mass to break the handles in kg10.0 – 18.5Complete the table with your answer to (a)(i) and the range of values. Has the strength of the bags changed?Use the data to explain your conclusion............................................................................................................................................ ........................................................................................................................................... ........................................................................................................................................... ......................................................................................................................................[2]Carrier bags are made of polyethene.(b)There are two types of polyethene.High density polyethene (HDPE) is stronger than low density polyethene (LDPE).HDPE is more crystalline than LDPEHow do the arrangements of molecules in HDPE and LDPE differ?Suggest a reason why this makes HDPE stronger.Y ou may use diagrams to help you answer.......................................................................................................................................................................................................................................................................................................................................................................................................................................................... (2)[Total: 6]© OCR 2014BLANK PAGEQuestion 4 begins on page 10PLEASE DO NOT WRITE ON THIS PAGETurn over © OCR 20144 An oil company refines crude oil into different fractions.This table shows the volume of each fraction made from a barrel of crude oil in litres.It also shows the range of the number of carbon atoms in the molecules in each fraction.fraction fraction in one barrelof crude oil in litresnumber of carbon atoms in moleculestop of barrel liquefied fuel gas 3 1 – 4petrol 40 5 – 10making chemicals 8 6 – 12fuel oil 8813 – 25lubricants 820 – 22 bottom of barrel bitumen for roads 1325+(a)Show that more than 80% of the crude oil is used as fuel.[2]© OCR 2014(b)Describe the trend in boiling points of the fractions from the top to the bottom of the barrel.Explain, using data from the table, why the boiling points change from one fraction to the next.The quality of written communication will be assessed in your answer............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ (6)[Total: 8]BLANK PAGEPLEASE DO NOT WRITE ON THIS PAGE5 This is a question about nanotechnology.Nanotechnology is the use and control of particles that are very small.(a)What is the range of sizes of nanoparticles?Put a tick (✓) in the box next to the correct answer.0.1 to 1 nm1 to 100 nm100 to 200 nm200 to 1000 nm[1]Some calculators have photocells to absorb light to(b)charge the battery.Photocells contain gold which absorbs light on its surface.Explain why photocells contain gold nanoparticles ratherthan a solid piece of gold.......................................................................................................................................................................................................................................................................................................................................................................................................................................................... (2)(c)Some scientists are concerned about the possible effects of nanoparticles on humans.Give two reasons why scientists are concerned.......................................................................................................................................................................................................................................................................................................................................................................................................................................................... (2)[Total: 5]6 Some people are talking about the Government’s advice on eating salt.This is what they say.(a) (i) Who is talking about information that has been peer reviewed ? Put ticks (✓) in the boxes next to the two correct answers. Dr Abbott Miss Brown Mr Collins Professor DerryMrs Evans[1](ii) Who is saying that a benefit of salt in food, outweighs a risk from eating too much salt?tick(✓) in the box next to the correct answer.aPutAbbottDrBrownMissCollinsMrDerryProfessorEvansMrs[1](iii) Which person is wrong about their salt intake?Put a tick (✓) in the box next to the correct answer.AbbottDrBrownMissCollinsMrProfessorDerryEvansMrs[1](iv) Companies add salt to foods to preserve them and for one other reason.What is that other reason? (1)(b)(i) People with high blood pressure can use potassium chloride as a substitute for salt(sodium chloride).Rocks containing potassium chloride are found deep underground and mined in thesame ways as those containing sodium chloride.Companies make potassium chloride using solution mining.Suggest reasons why they might use solution mining rather than digging rocks out of theground.................................................................................................................................................................................................................................................................................................................................................................................................................................. (2)(ii) The electrolysis of potassium chloride solution is similar to the electrolysis of sodium chloride.What three products are made when potassium chloride solution is electrolysed?............................................................................................................................ (2)[Total: 8]BLANK PAGEQuestion 7 begins on page 18 PLEASE DO NOT WRITE ON THIS PAGE7 In remote parts of a developing country, the drinking water causes diseases that kill people. In one area people started to add chlorine to drinking water from 2009. A charity raised the money to pay for this.Look at the graphs.450 000400 000population with chlorine added to drinking wateryear350 000300 000250 000200 000150 000100 00050 000020 00040 00060 000number of people with disease from drinking water200920102011year201280 000100 000120 000Describe in detail what the two graphs tell you.What conclusions can you make about the effectiveness of adding chlorine to drinking water in this area?The quality of written communication will be assessed in your answer........................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .. (6)[Total: 6]8 Geologists understand the history of the Earth’s surface by looking at rocks.(a)Features in these rocks tell us things about their origin.Draw a straight line from each feature to what it tells us.feature what it tells usrock salt formed in fast flowing riversfossils of plantsand animalsformed in desertsrounded grains ofsand in sandstonethe age of the rocksharp grains of sand in sandstone formed when shallow seas evaporated[3](b)Salt, limestone and coal were made in different climatic conditions.All three of these rock types are found in north west England.Which two statements, when put together, explain how this happened?Put ticks (✓) in the boxes next to the two correct answers.The atmosphere of the early Earth was mainly nitrogen.Ocean currents cause land areas to move.When continents moved their climate changed.The weather in the UK changes every day.Earthquakes occur on the edges of tectonic plates as they move.Tectonic plates move across the Earth.[2](c)Studies of the magnetic properties of rocks tell scientists about the rocks.What do they measure and what does this tell them about the rocks?......................................................................................................................................................................................................................................................................................................................................................................................................................................................... (2)[Total: 7]END OF QUESTION PAPERBLANK PAGEPLEASE DO NOT WRITE ON THIS PAGEPLEASE DO NOT WRITE ON THIS PAGECopyright InformationOCR is committed to seeking permission to reproduce all third-party content that it uses in its assessment materials. OCR has attempted to identify and contact all copyright holders whose work is used in this paper. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced in the OCR Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download from our public website () after the live examination series.If OCR has unwittingly failed to correctly acknowledge or clear any third-party content in this assessment material, OCR will be happy to correct its mistake at the earliest possible opportunity.For queries or further information please contact the Copyright Team, First Floor, 9 Hills Road, Cambridge CB2 1GE.OCR is part of the Cambridge Assessment Group; Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.T h e P e r i o d i c T a b l e o f t h e E l e m e n t s* T h e l a n t h a n o i d s (a t o m i c n u m b e r s 58-71) a n d t h e a c t i n o i d s (a t o m i c n u m b e r s 90-103) h a v e b e e n o m i t t e d .T h e r e l a t i v e a t o m i c m a s s e s o f c o p p e r a n d c h l o r i n e h a v e n o t b e e n r o u n d e d t o t h e n e a r e s t w h o l e n u m b e r .12345670K e y1H h y d r o g e n 14H eh e l i u m27L il i t h i u m39B eb e r y l l i u m4r e l a t i v e a t o m i c m a s s a t o m i c s y m b o ln a m e a t o m i c (p r o t o n ) n u m b e r 11Bb o r o n512Cc a r b o n 614N n i t r o g e n716O o x y g e n819Ff l u o r i n e920N en e o n1023N as o d i u m1124M gm a g n e s i u m1227A la l u m i n i u m1328S is i l i c o n1431Pp h o s p h o r u s 1532Ss u l f u r 1635.5C lc h l o r i n e 1740A ra r g o n1839Kp o t a s s i u m1940C ac a l c i u m2045S cs c a n d i u m2148T it i t a n i u m2251Vv a n a d i u m2352C rc h r o m i u m2455M nm a n g a n e s e 2556F ei r o n 2659C o c o b a l t 2759N i n i c k e l 2863.5C u c o p p e r 2965Z n z i n c 3070G ag a l l i u m3173G eg e r m a n i u m 3275A sa r s e n i c 3379S es e l e n i u m 3480B rb r o m i n e 3584K rk r y p t o n3685R br u b i d i u m3788S rs t r o n t i u m3889Yy t t r i u m3991Z rz i r c o n i u m4093N bn i o b i u m4196M om o l y b d e n u m42[98]T ct e c h n e t i u m43101R ur u t h e n i u m44103R hr h o d i u m 45106P dp a l l a d i u m 46108A gs i l v e r 47112C d c a d m i u m48115I ni n d i u m 49119S nt i n50122S ba n t i m o n y51128T et e l l u r i u m52127Ii o d i n e53131X ex e n o n54133C sc a e s i u m55137B ab a r i u m56139L a *l a n t h a n u m57178H fh a f n i u m72181T at a n t a l u m73184Wt u n g s t e n74186R er h e n i u m75190O so s m i u m 76192I r i r i d i u m 77195P tp l a t i n u m78197A ug o l d79201H gm e r c u r y 80204T l t h a l l i u m 81207P bl e a d82209B ib i s m u t h83[209]P op o l o n i u m 84[210]A ta s t a t i n e85[222]R nr a d o n86[223]F rf r a n c i u m 87[226]R ar a d i u m 88[227]A c *a c t i n i u m 89[261]R f r u t h e r f o r d i u m104[262]D bd u b n i u m105[266]S gs e a b o r g i u m106[264]B hb o h r i u m 107[277]H s h a s s i u m 108[268]M t m e i t n e r i u m109[271]D sd a r m s t a d t i u m110[272]R g r o e n t g e n i u m111E l e m e n t s w i t h a t o m i c n u m b e r s 112-116 h a v e b e e n r e p o r t e d b u t n o t f u l l y a u t h e n t i c a t e d。

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INSTRUCTIONS TO CANDIDATES •Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters.• Use black ink. HB pencil may be used for graphs and diagrams only.• Answer all the questions.• Read each question carefully. Make sure you know what you have to do before startingyour answer.• Write your answer to each question in the space provided. Additional paper may beused if necessary but you must clearly show your candidate number, centre number and question number(s).• Do not write in the bar RMATION FOR CANDIDATES • The quality of written communication is assessed in questions marked with a pencil ( ).• The number of marks is given in brackets [ ] at the end of each question or part question.• The total number of marks for this paper is 60.• This document consists of 24 pages. Any blank pages are indicated.• A list of qualitative tests for ions is printed on page 2.•The Periodic T able is printed on the back page.OCR is an exempt CharityTurn over© OCR 2015 [R/601/7592]DC (ST/FD) 102462/3*4824195053*© OCR 2015TWENTY FIRST CENTURY SCIENCE DATA SHEETQualitative analysisTests for ions with a positive chargeIonTestObservationcalcium Ca 2+add dilute sodium hydroxidea white precipitate forms; the precipitate does not dissolve in excess sodium hydroxide copper Cu 2+add dilute sodium hydroxidea light blue precipitate forms; the precipitate does not dissolve in excess sodium hydroxide iron(II )Fe 2+add dilute sodium hydroxidea green precipitate forms; the precipitate does not dissolve in excess sodium hydroxide iron(III )Fe 3+add dilute sodium hydroxidea red-brown precipitate forms; the precipitate does not dissolve in excess sodium hydroxide zinc Zn 2+add dilute sodium hydroxidea white precipitate forms; the precipitate dissolves in excess sodium hydroxideTests for ions with a negative chargeIonTestObservationcarbonate CO 32−add dilute acidthe solution effervesces; carbon dioxide gas is produced (the gas turns lime water from colourless to milky)chloride C l −add dilute nitric acid,then add silver nitrate a white precipitate forms bromide Br −add dilute nitric acid,then add silver nitrate a cream precipitate forms iodide I −add dilute nitric acid,then add silver nitrate a yellow precipitate formssulfate SO 42−add dilute acid,then add barium chloride or barium nitratea white precipitate formsTurn over© OCR 2015Answer all the questions.1 Jack investigates the reactions of some Group 1 metals with water.H e adds a small piece of each metal to water and measures how long it takes for the reaction to finish.metalwaterJack does experiments using lithium, sodium and potassium.He uses the same amount of metal and the same amount of water each time.The table shows his results.Metal Time taken for the reaction to finishin slithium 35sodium 12potassium5(a) What does the table show about the reactivity of the Group 1 metals?Explain your answer. (2)Jack adds a small piece of potassium to water in a beaker.(b)He adds some Universal Indicator to the water.He uses a thermometer to measure the temperature change during the reaction.He writes down his observations.Draw straight lines to connect each observation with the correct reason.Observation ReasonUniversal Indicator turns blue. A flammable gas is made.A flame appears around the potassium.The reaction is exothermic.The temperature of the water increases.Potassium has a very low density. Potassium stays on the surface of the water.An alkali is made.[2]Potassium is stored in oil.(c)Jack leaves a piece of potassium out of the oil for a few minutes.He notices that the shiny surface of the potassium becomes dull very quickly.What is the potassium reacting with?aPutring around the correct answer.hydrogen oxygen nitrogen chlorine[1][Total: 5]© OCR 2015Turn over© OCR 20152Abbi does some experiments to investigate the reactivity of Group 7 elements.Group 7FfluorineC lchlorineBrbromine Iiodine(a) For safety, Abbi does all of the experiments in a fume cupboard. Why is this necessary? (1)(b) Abbi passes chlorine gas over a filter paper soaked in potassium bromide solution. Chlorinegas is blown onto the filter paper down a tube.potassium bromidesolutionchlorineThe filter paper goes orange because bromine is made.(i) Complete the word equation for this reaction.chlorine +potassium bromide bromine +potassium ……………………………..[1](ii) What is the name for this type of reaction? Put a ring around the correct answer.combustion displacement electrolysis neutralisation[1](c)Abbi does some experiments using fluorine.She passes fluorine gas down a tube onto the filter papers.fluorine gasGroup 7 compoundThe table shows her results.Colour changeGas Compound onfilter paperfluorine potassium chloride paper goes pale greenfluorine potassium bromide paper goes orangefluorine potassium iodide grey solid appears on paperExplain why these colour changes happen.The quality of written communication will be assessed in your answer...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... (6)[Total: 9]© OCR 2015BLANK PAGEPLEASE DO NOT WRITE ON THIS PAGETurn over for the next questionTurn over © OCR 20153 Mendeleev developed the modern Periodic Table. Other scientists were involved.Scientist 2Scientist 5© OCR 2015(a)Which two scientists are doing a peer review?Explain how what they say is peer review.......................................................................................................................................................................................................................................................................................................................................................................................................................................................... (3)Mendeleev’s ideas were supported by the discoveries of Scientist 3 and Scientist 4.(b)Explain why.......................................................................................................................................................................................................................................................................................................................................................................................................................................................... (2)[Total: 5]Turn over © OCR 20154Liz collects some samples of rock.She thinks that the samples contain limestone.(a)Limestone rock is mainly calcium carbonate.Liz tests the rock. She adds dilute acid and tests the gas given off using limewater.What results does Liz expect if the rock contains carbonate ions? (See data sheet, page 2) Put a tick (✓) in the boxes next to the two correct answers.A blue precipitate is made.Therockturnsyellow.Theacidturnsred.Thelimewaterturnsmilky.Carbondioxideisproduced.[1](b)Limestone is a solid mineral.In which part of the Earth are solid minerals found?Put a ring around the correct answer.atmosphere hydrosphere lithosphere[1]© OCR 2015(c)On Earth, limestone only forms in large amounts of water.Scientists have sent space probes to Mars.The space probes test rock on Mars to see if it contains limestone.So far no limestone has been found.Explain why the scientists are interested in collecting data about limestone on Mars....................................................................................................................................................................................................................................................................................................... (2)[Total: 4]5 Lee looks up some data about some molecular substances.Substance Formula Relativeformulamass State at room temperaturenitrogen N228...........................oxygen.....................32gascarbon dioxide CO244gaswater H2O18liquid(a)Complete the table by filling in the blank spaces. [2] (b)All of the substances in the table are molecular.What does molecular mean?Put a tick (✓) in the box next to the correct answer.manyionsbondedtogethera large structure of identical atomsa small number of atoms bonded togethera structure of protons and electrons[1](c)Lee looks at the data and has this idea.I think that if a molecular substance has a relative formulamass of less than 100 it is always a gas.Does the data in the table support Lee’s idea?Explain your reasoning.......................................................................................................................................................................................................................................................................................................................................................................................................................................................... (3)[Total: 6]6 Metals can be extracted from metal oxides by heating with carbon.The equation shows what happens when copper oxide is heated with carbon.(a)copper oxide + carbonWhy is this a reduction reaction?Put a tick (✓) in the box next to the correct answer.Too much carbon dioxide is made.The copper oxide loses oxygen.higher.getsThemassThe process is not very efficient.[1]Large-scale metal extraction processes involve both costs and benefits.(b)(i) Companies choose metal extraction processes that use as little energy as possible.Why does using less energy reduce the cost to the company and thecost to the environment?Put a tick (✓) in the boxes next to the three correct answers.Using less energy uses less fuel.Some fuels are less flammable than others.All fuels burn to give off energy.Using more fuel gives off more pollutant gases.Different types of fuel can be used for the process.[2](ii) Give two examples of the ways that people benefit from large-scale metal extraction processes....................................................................................................................................................................................................................................................................................... (2)(c)The table shows some data about the most cost-effective methods for extracting metals frommetal oxides. more reactive metal Metal oxide Minimum temperatureto make metal byheating with carbon in°CMost cost-effectivemethod of extractioncalcium oxide2100electrolysis magnesium oxide1600electrolysis aluminium oxide2100electrolysiszinc oxide 900heating with carbon iron oxide700heating with carbon lead oxide 400heating with carbon copper oxide100heating with carbonUse the data to explain how the method chosen to extract a metal is related to its reactivity and the energy involved.The quality of written communication will be assessed in your answer. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... . (6)[Total: 11]7 Sam works for a company that makes chemicals to kill fungi on plants.One of the chemicals the company makes is copper sulfate.(a) Sam makes some copper sulfate from copper oxide. Complete the word and symbolequation for the reaction.copper oxide+copper sulfate+waterCuO+H 2SO4CuSO 4+[2](b) Sam draws a graph to show the theoretical yield of copper sulfate crystals that can be madefrom copper oxide.0.00.05.010.0theoreticalyield of coppersulfate crystals in gmass of copper oxide used in g15.020.025.0 1.02.03.04.05.06.07.08.0(i) What mass of copper oxide would Sam need to make 10 g of copper sulfate crystals?...........................................................[1] (ii) The company makes the fungicide in large quantities.Use your answer to (i) to work out how much copper oxide would be needed to make5 kg of copper sulfate crystals. (2)(iii) In practice, Sam finds that he makes a lower mass of copper sulfate crystals than he predicts.Which statements can explain why this happens?Put a tick (✓) in the boxes next to the two correct answers.There are impurities in the copper oxide.muchacid.tooaddsSamSam has not dried his crystals thoroughly.Some chemicals are lost during the experiment.The rate of the reaction was too fast.[2][Total: 7]8 Acid rain contains a dilute solution of sulfuric acid.Acid rain causes some lakes to become too acidic, killing fish and other wildlife.What can be used to measure acidity?(a)Put a tick (✓) in the boxes next to the two correct answers.asyringegasIndicatorUniversalcylinderameasuringameterpH[1]A water company treats a lake with calcium hydroxide to neutralise acidity.(b)What is the pH when the water is neutral?Put a ring1 4 7 9 14[1]The water company measures the temperature of the surface of the lake after neutralisation.(c)They find that the temperature has increased.Why do some reactions cause an increase in temperature?Put a tick (✓) in the box next to the correct answer.Some reactions give out energy.areendothermic.reactionsSomeReactions need energy to start.Reactions are faster at higher temperatures.[1](d)The calcium hydroxide is dropped into the lake from a helicopter.The calcium hydroxide is a fine powder and not large pieces.What effect does using a fine powder rather than large pieces have on the rate of the reaction?Explain your answer.......................................................................................................................................................................................................................................................................................................................................................................................................................................................... (2)[Total: 5]9 Joe does some experiments to investigate the rate of a reaction.He measures the time taken for the reaction to finish at different temperatures.(a)Temperature in °C Time taken for reaction to finish in s20453025401550 8Explain what the results show about the rate of reaction.................................................................................................................................................... (2)(b)Joe investigates the effect of some catalysts on the reaction.He writes down which metal ion is in each catalyst.He measures the time taken for the reaction to finish when each catalyst is used.JoeEveDo the results in the table support the ideas of Joe and Eve? Explain your answer.The quality of written communication will be assessed in your answer. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... . (6)[Total: 8]END OF QUESTION PAPERBLANK PAGEPLEASE DO NOT WRITE ON THIS PAGEPLEASE DO NOT WRITE ON THIS PAGEOxford Cambridge and RSACopyright InformationOCR is committed to seeking permission to reproduce all third-party content that it uses in its assessment materials. OCR has attempted to identify and contact all copyright holders whose work is used in this paper. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced in the OCR Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download from our public website () after the live examination series.If OCR has unwittingly failed to correctly acknowledge or clear any third-party content in this assessment material, OCR will be happy to correct its mistake at the earliest possible opportunity.For queries or further information please contact the Copyright Team, First Floor, 9 Hills Road, Cambridge CB2 1GE.OCR is part of the Cambridge Assessment Group; Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.T h e P e r i o d i c T a b l e o f t h e E l e m e n t s* T h e l a n t h a n o i d s (a t o m i c n u m b e r s 58-71) a n d t h e a c t i n o i d s (a t o m i c n u m b e r s 90-103) h a v e b e e n o m i t t e d .T h e r e l a t i v e a t o m i c m a s s e s o f c o p p e r a n d c h l o r i n e h a v e n o t b e e n r o u n d e d t o t h e n e a r e s t w h o l e n u m b e r .12345670K e y1H h y d r o g e n 14H eh e l i u m27L il i t h i u m39B eb e r y l l i u m4r e l a t i v e a t o m i c m a s s a t o m i c s y m b o ln a m e a t o m i c (p r o t o n ) n u m b e r 11Bb o r o n512Cc a r b o n614N n i t r o g e n716O o x y g e n819Ff l u o r i n e 920N en e o n1023N as o d i u m1124M gm a g n e s i u m1227A la l u m i n i u m1328S i s i l i c o n1431P p h o s p h o r u s 1532S s u l f u r 1635.5C lc h l o r i n e 1740A ra r g o n1839Kp o t a s s i u m1940C ac a l c i u m2045S cs c a n d i u m2148T it i t a n i u m2251Vv a n a d i u m2352C rc h r o m i u m2455M n m a n g a n e s e 2556F ei r o n2659C o c o b a l t 2759N i n i c k e l 2863.5C uc o p p e r 2965Z n z i n c 3070G ag a l l i u m3173G eg e r m a n i u m 3275A sa r s e n i c 3379S es e l e n i u m 3480B rb r o m i n e 3584K rk r y p t o n3685R br u b i d i u m3788S rs t r o n t i u m3889Yy t t r i u m3991Z rz i r c o n i u m4093N bn i o b i u m4196M om o l y b d e n u m42[98]T c t e c h n e t i u m 43101R ur u t h e n i u m44103R hr h o d i u m 45106P dp a l l a d i u m46108A gs i l v e r 47112C dc ad m i u m48115I ni n d i u m 49119S nt i n50122S ba n t i m o n y51128T et e l l u r i u m52127Ii o d i n e53131X ex e n o n54133C sc a e s i u m55137B ab a r i u m56139L a *l a n t h a n u m57178H fh a f n i u m72181T at a n t a l u m73184Wt u n g s t e n74186R er h e n i u m75190O so s m i u m76192I ri r i d i u m 77195P tp l a t i n u m78197A ug o l d79201H gm e r c u r y 80204T l t h a l l i u m 81207P bl e a d82209B ib i s m u t h83[209]P op o l o n i u m 84[210]A ta s t a t i n e85[222]R nr a d o n86[223]F rf r a n c i u m 87[226]R ar a d i u m 88[227]A c *a c t i n i u m 89[261]R f r u t h e r f o r d i u m104[262]D bd u b n i u m105[266]S gs e a b o r g i u m106[264]B hb o h r i u m 107[277]H sh a s s i u m 108[268]M t m e i t n e r i u m109[271]D sd a r m s t a d t i u m110[272]R g r o e n t g e n i u m111E l e m e n t s w i t h a t o m i c n u m b e r s 112-116 h a v e b e e n r e p o r t e d b u t n o t f u l l y a u t h e n t i c a t e d。