九天国际教育GCSE真题June 2016 QP - Unit C2 (H) Edexcel Chemistry GCSE
九天国际教育GCSE真题November 2013 (v3) QP - Paper 1 CIE Chemistry IGCSE
This document consists of 19 printed pages and 1 blank page.IB13 11_0620_13/RP© UCLES 2013[Turn over*5450428188*UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary EducationCHEMISTRY 0620/13Paper 1 Multiple Choice Octob e r/Nov e mb e r 201345 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, highlighters, 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 f our 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 20. Electronic calculators may be used.© UCLES 2013 0620/13/O/N/13The glass slide is removed. Diagram 2 shows the appearance of the gas jars after one hour.diagram 1diagram 2bromine vapourairWhich statement explains why the bromine and air mix together? A Bromine is denser than air. B Bromine is lighter than air.C Bromine molecules moved upwards and molecules in air moved downwards.D Molecules in bromine and air moved randomly.2 The diagram shows a method for separating a substance that contains X and Y.Which types of substance can be separated as shown? A compounds B elements C mixtures D molecules3Diagram 1 shows the paper chromatogram of substance X.RYXdiagram 1Diagram 2 shows the cooling curve for substance Y.timediagram 2Which statement about X and Y is correct?A X is a mixture and Y is a pure substance.B X is a pure substance and Y is a mixture.C X and Y are mixtures.D X and Y are pure substances.© UCLES 2013 0620/13/O/N/13 [Turn over© UCLES 2013 0620/13/O/N/134 The atomic structures of four atoms are shown.atomnumber of neutronsnumber of protonsnumber of electronsW6 6 6X 7 7 7Y 8 6 6 Z8 8 8Which pair of atoms are isotopes? A W and XB W and YC X and YD Y and Z5 The diagram shows the structure of three particles, R, S and T.key = electron = neutron = proton = nucleuse n p RSTWhich row describes these particles?ionsisotopes A R S and T B R and S T C S R and T D TR and S6Which statement about the bonding in a molecule of water is not correct? A Both hydrogen and oxygen have a noble gas configuration of electrons. B Each hydrogen shares its one electron with oxygen. C Oxygen shares one of its own electrons with each hydrogen.D Oxygen shares two of its own electrons with each hydrogen.© UCLES 2013 0620/13/O/N/13[Turn over7 The electronic structures of atoms P and Q are shown.P and Q react to form an ionic compound.What is the formula of the compound? A Q 7PB QPC QP 3D QP 78 A solid mixture contains an ionic salt, X, and a covalent organic compound, Y. Two students suggest methods of separating the mixture as shown.method 1method 2Which methods of separation are likely to work?12 A B C D© UCLES 2013 0620/13/O/N/13M r , is not correct for the molecule given? molecule M rA ammonia, NH 3 17B carbon dioxide, CO 2 44C methane, CH 4 16 Doxygen, O 2 1610 Two electrolysis experiments were carried out as shown in the diagram below.The graphite electrodes are labelled 1-4.molten sodium chlorideconcentrated aqueous sodium chlorideWhich row describes the products at the electrodes in these experiments?electrode 1electrode 2electrode 3electrode 4A chlorine hydrogen chlorine hydrogenB chlorine sodium chlorine hydrogenC chlorine sodium hydrogen chlorineD sodium chlorine sodium chlorine© UCLES 2013 0620/13/O/N/13[Turn over11 One molten compound and two aqueous solutions were electrolysed.The table gives the compounds electrolysed and the electrodes used.substance electrolysed electrodes1 concentrated hydrochloric acid carbon2 concentrated sodium chlorideplatinum 3molten lead bromideplatinumIn which experiments is a gas evolved at the cathode?A 1, 2 and 3B 1 and 2 onlyC 1 onlyD 3 only12When ammonium nitrate is added to water the temperature of the water decreases.The ammonium nitrate can be recovered by evaporating the water added.Which explains these observations?A The ammonium nitrate dissolves in the water and the process is endothermic.B The ammonium nitrate reacts with the water and the process is endothermic.C The ammonium nitrate dissolves in the water and the process is exothermic.D The ammonium nitrate reacts with the water and the process is exothermic.13 Which substance could not be used as a fuel to heat water in a boiler?A ethanolB hydrogenC methaneD oxygen14 Which substance is not a fossil fuel?A coalB keroseneC gasolineD wood© UCLES 2013 0620/13/O/N/1315 A student investigates the rate of reaction between zinc and an excess of sulfuric acid.The graph shows the results of two experiments, X and Y.volume of hydrogenWhich change explains the difference between X and Y? A A catalyst is added in Y.B A lower temperature is used in Y.C Larger pieces of zinc are used in Y.D Less concentrated acid is used in Y.16 When green iron(II ) sulfate is heated, it turns white and a colourless liquid is produced. When the liquid is put back into the white solid it changes back to green.What type of reaction takes place and what is the name of the liquid?type of reactionname of liquidA redox sulfuric acidB redox waterC reversible sulfuric acid Dreversible water17The reactions shown may occur in the air during a thunder storm.N2 + O2→ 2NO2NO + O2→ 2NO2NO + O3→ NO2 + O2Which row shows what happens to the reactant molecules in each of these reactions?N2 NO O3A oxidised oxidised oxidisedB oxidised oxidised reducedC reduced reduced oxidisedD reduced reduced reduced18Which are properties of an acid?1 reacts with ammonium sulfate to form ammonia2 turns red litmus blue1 2ABCD19Which of the following are properties of the oxides of non-metals?property 1 property 2A acidic covalentB acidic ionicC basic covalentD basic ionic© UCLES 2013 0620/13/O/N/13 [Turn over20The cations shown are identified by the colour of the precipitates formed when an excess of an aqueous solution of X is added.cations present effect of adding an excess ofaqueous Xiron(II) (Fe2+) greenprecipitatecopper(II) (Cu2+) lightblueprecipitateiron(III) (Fe3+) red-brownprecipitate What is X?A ammoniaB limewaterC silver nitrateD sodium hydroxide21Calcium, on the left of Period 4 of the Periodic Table, is more metallic than bromine on the right of this period.Why is this?Calcium hasA fewer electrons.B fewer protons.C fewer full shells of electrons.D fewer outer shell electrons.22The diagrams show the labels of four bottles.Which label is not correct?A B C DBromineBr2 Harmful liquid. Do not spill.IodineI2DangerAvoid breathing vapourfrom the solid.PotassiumKDangerStore under water.SodiumNaDangerStore under oil.© UCLES 2013 0620/13/O/N/1323An element has a melting point of 1084°C and a density of 8.93g/cm3. It’s oxide can be used asa catalyst.In which position in the Periodic Table is the element found?A B CD24The diagram shows a light bulb.filamentargonWhy is argon used instead of air in the light bulb?A Argon is a good conductor of electricity.B Argon is more reactive than air.C The filament glows more brightly.D The filament does not react with the argon.25Duralumin is an alloy. It contains aluminium, copper and magnesium.It has many uses including the manufacture of cooking utensils and ships.Which statement about duralumin and its properties is correct?A It is a good conductor of electricity.B It is brittle.C It is soluble in water.D The aluminium, copper and magnesium are chemically combined.26The list gives the order of some metals (and hydrogen) in the reactivity series.Metal X is also included:Most reactive KMgZn(H)XLeast reactive CuWhich row correctly shows the properties of metal X?reacts with dilute acids oxide reduced by carbonA no noB no yesC yes noD yes yes27 A new bicycle is being developed.Two different materials are used in its construction, both of which must be corrosion resistant.Which two metals could be used?A aluminium and mild steelB aluminium and stainless steelC mild steel and pure ironD pure iron and stainless steel28Iron is extracted from hematite in the Blast Furnace.The hematite contains silica as an impurity.What reacts with this impurity to remove it?A calcium oxideB carbonC carbon dioxideD oxygen29In which process is carbon dioxide not formed?A burning of natural gasB fermentationC heating limeD respiration30Carbon dioxide is produced whenX reacts with ethanol.Y reacts with sodium carbonate.What are X and Y?X YA H2 HC lB H2 NaOHC O2 HC lD O2 NaOH31 A sample of fertiliser is tested by warming it with aqueous sodium hydroxide.A colourless gas is produced which turns red litmus paper blue.Which element, essential for plant growth, must be present?A nitrogenB phosphorusC potassiumD sulfur32Iron rusts. This process involves the ……1…… of iron. Rusting can be prevented by covering the iron with grease or paint which stops ……2…… from reaching the surface of the iron.Which words correctly complete gaps 1 and 2?1 2A oxidation nitrogenB oxidation oxygenC reduction nitrogenD reduction oxygen33Oxides of nitrogen are given out from car exhausts.Which row best shows why oxides of nitrogen are unwanted?acidic toxicA no noB no yesC yes noD yes yes34Water is treated at a water works to make it fit to drink.What is present in the water when it leaves the waterworks?A bacteria onlyB bacteria and insoluble substancesC chlorine onlyD chlorine and soluble substancesproduct What is the product and what waste gas is formed?gasproduct wasteA lime, CaO carbon monoxideB lime, CaO carbon dioxideC slaked lime, Ca(OH)2 carbon monoxideD slaked lime, Ca(OH)2 carbon dioxide36Molecule X is both an alkene and a carboxylic acid.Which row describes X?presentsaturated –COOHA no noB no yesC yes noD yes yes37Which hydrocarbon reacts with steam to produce ethanol?A C2H4B C2H6C C3H6D C3H838 Petroleum is a mixture of different hydrocarbons.Which process is used to separate the petroleum into groups of similar hydrocarbons?A combustionB crackingC fractional distillationD reduction39 Which row represents compounds in the same homologous series?H C H H C H H C H H H H C H HC H H C H H C HH HH C H HC H H C HH HH C HHC HH O H H C HH C OH H C H HHC CH HH C HH C HH HHC H HC HH HH C HHOHH C HHC H H C Br H C H H HHC HH H H C HH H HC HH C OO HA B C D C C H HHC HH C HH HHH40 The diagram shows a flow diagram.petroleumsubstance X ● burns with a yellow flame ● does not decolourise bromine waterWhich type of organic compounds are X and Y?substance Xsubstance YA alcohol alkaneB alkane alkeneC alkene alkane Dalkane alcoholBLANK PAGE20Per mission to r epr oduce items wher e thir d-par ty owned mater ial pr otected by copyr ight is included has been sought and clear ed wher e possible. Ever y 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. G r ou 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 n Z i n c3070G aG a l l i u m3127A l A 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 g S 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。
A-level经济学历年试卷June 2016 QP - Paper 1 Edexcel (A) Economics AS-level
Turn over*P49594A0124*P49594A©2016 Pearson Education Ltd.1/1/1/1/1/1/1/1Instructions• Use black ink or ball-point pen.•Fill in the boxes at the top of this page with your name,centre number and candidate number.• A nswer all questions in Section A.•In Section B, answer all of questions 6(a) to 6(e) and one question from 6(f) or 6(g).•A nswer the questions in the spaces provided– there may be more space than you need.Information•The total mark for this paper is 80.•T he marks for each question are shown in brackets– use this as a guide as to how much time to spend on each question.•C alculators may be used.Advice•Read each question carefully before you start to answer it.•Check your answers if you have time at the end.*P49594A0224*2*P49594A0324*Turn over3*P49594A0424*4*P49594A0524*Turn over5*P49594A0624*6*P49594A0724*Turn over7BLANK PAGEQUESTION 6 BEGINS ON THE NEXT PAGE.*P49594A0824*8*P49594A0924*Turn over9Extract AProblems facing UK first time buyersOver a third of aspiring first time buyers in the UK have given up hope of ever being able to save for a deposit to buy a property, new research has found. A deposit is the minimum amount that must be paid upfront when buying a property, which is a proportion of the price of the property.The UK Government has a Help to Buy scheme designed to help people buy a home. The government subsidises the mortgage (loan) needed to buy a property, so buyers require a smaller amount saved as a deposit. Under this scheme, first time buyers need as little as a 5% deposit to qualify for a mortgage. This is due to end in the first few months of 2017. The research from mortgage insurer Genworth says this will mean a return to 20% deposits, which would see the average time needed to save for a deposit rise from three years to over 10 years.“Trying to buy your first home in the current climate is like chasing a runaway train. Even with good salaries that could comfortably support a mortgage, thousands of aspiring first time buyers can only save modest sums, especially those who are already paying rent. This deposit trap is why many feel they are left with the all or nothing choice of borrowing from family or waving goodbye to ever owning a home,” said Simon Crone, a vice president at Genworth.“Help to Buy has significantly improved access to mortgages with deposits that areactually realistic to save. The numbers using the scheme may be modest, but it has made significant inroads in the short-term to boost access at the lower end of the property market,” he pointed out.(Source: adapted from /news/europe/uk-first-time-buyers-201409309641.html September 2014)Extract BHousing and flood defencesA radical new approach to housing and a £2.3 billion of investment in flood defences were announced as part of the UK Government’s new National Infrastructure Plan 2014.One key proposal is for the government to plan, build and sell homes. An initial programme on a government-owned former airfield near Cambridge will see the development of 10 000 homes. This approach will fast track the development by providing certainty and making new homes available more quickly.The government will make the initial investment but expects that later costs will be met through the sale of land and homes. It will also evaluate the feasibility and economiceffects of rolling out this model on a wider scale, to support and accelerate housing supply.The plan also commits to £2.3 billion of capital investment to over 1400 flood defence projects in a 6-year programme of investment. As a result, over 300 000 homes will be better protected and over £30 billion of economic damages prevented. Majorprojects that will benefit include £42 million for the Oxford Flood Alleviation Scheme, £80 million for the Humber Estuary and over £17 million for Tonbridge, Yalding and the surrounding communities.(Source: adapted from https:///government/news/ambitious-plans-for-housing-flood-defence-and-roads-set-out-in-national-infrastructure-plan-2014)510152051510*P49594A01024*106 (a) With reference to Figure 1, explain one possible reason for the differences in priceelasticity of supply of new housing between countries.(5)(b) With reference to Extract A, assess the likely impact of the Help to Buy scheme onthe market for rented properties in the UK.(10)(c) Explain the likely impact on producer surplus of an increase in the demand forhousing. Use a diagram to illustrate your answer.(6)(d) With reference to Figure 2, calculate the percentage change in house pricesbetween the first quarter of 2009 and the first quarter of 2015. You are advised to show your working.(4)(e) With reference to Figures 1 and 2 and your own knowledge, discuss the functionsof the price mechanism in allocating housing.(15)Answer EITHER(f) Evaluate the likely microeconomic effects of government intervention in the UKhousing market.(20)OR(g) Evaluate the case for government provision of goods and services such as flooddefence schemes or housing.(20)(5) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 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.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(c) Explain the likely impact on producer surplus of an increase in the demand forhousing. 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.................................................................................................................................................................................................................................................................................... ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(d) With reference to Figure 2, calculate the percentage change in house pricesbetween the first quarter of 2009 and the first quarter of 2015. 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.................................................................................................................................................................................................................................................................................... .........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(e) With reference to Figures 1 and 2 and your own knowledge, discuss the functionsof the price mechanism in allocating housing.(15) 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Alevel经济学历年试卷June 2016 MS - Paper 1 Edexcel (A) Economics AS-level
Mark scheme (Results)Summer 2016Pearson Edexcel GCE AS Levelin Economics A (8EC0)Paper 01 Introduction to markets and market failureEdexcel and BTEC QualificationsEdexcel and BTEC qualifications are awarded by Pearson, the UK’s largest awarding body. We provide a wide range of qualifications including academic, vocational, occupational and specific programmes for employers. For further information visit our qualifications websites at or . Alternatively, you can get in touch with us using the details on our contact us page at /contactus.Pearson: helping people progress, everywherePearson aspires to be the world’s leading learning company. Our aim is to help everyone progress in their lives through education. We believe in every kind of learning, for all kinds of people, wherever they are in the world. We’ve been involved in education for over 150 years, and by working across 70 countries, in 100 languages, we have built an international reputation for our commitment to high standards and raising achievement through innovation in education. Find out more about how we can help you and your students at: /ukSummer 2016Publications Code 8EC0_01_1606_MSAll the material in this publication is copyright© Pearson Education Ltd 2016General Marking Guidance∙All candidates must receive the same treatment.Examiners must mark the first candidate in exactly thesame way as they mark the last.∙Mark schemes should be applied positively.Candidates must be rewarded for what they have shownthey can do rather than penalised for omissions.∙Examiners should mark according to the markscheme not according to their perception of where thegrade boundaries may lie.∙There is no ceiling on achievement. All marks onthe mark scheme should be used appropriately.∙All the marks on the mark scheme are designed to beawarded. Examiners should always award full marks ifdeserved, i.e. if the answer matches the mark scheme.Examiners should also be prepared to award zero marks ifthe candidate’s response is not worthy of credit accordingto the mark scheme.∙Where some judgement is required, mark schemeswill provide the principles by which marks will be awardedand exemplification may be limited.∙When examiners are in doubt regarding theapplication of the mark scheme to a candidate’s response,the team leader must be consulted.∙Crossed out work should be marked UNLESS thecandidate has replaced it with an alternative response.Pearson Education Limited. Registered company number 872828 with its registered office at 80 Strand, London WC2R 0RL。
九天国际教育GCSE真题November 2010 (v3) QP - Paper 5 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.Practical notes are provided on page 8.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.CHEMISTRY0620/53Paper 5 Practical TestOctober/November 20101 hour 15 minutesCandidates answer on the Question Paper.Additional Materials:As listed in the Con fidential InstructionsUNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certi fi cate of Secondary EducationThis document consists of 6 printed pages and 2blank pages.[Turn overIB10 11_0620_53/3RP © UCLES 2010*3216989122*For Examiner’s Use Total12For Examiner’sUse1Y ou are going to investigate what happens when dilute hydrochloric acid reacts with two different alkaline solutions, F and G .R ead all instructions below carefully before starting the experiments. I nstructions Y ou are going to carry out two experiments. (a) E xperiment 1 Fill the burette with the dilute hydrochloric acid provided to the 0.0 cm 3 mark.U sing a measuring cylinder, pour 25 cm 3 of solution F into a conical fl ask. Add 4 to 6drops of phenolphthalein indicator to the conical fl ask.A dd the hydrochloric acid from the burette 1 cm 3 at a time while shaking the fl ask. When the colour of the phenolphthalein changes, record in the table the volume of acid added.(b) E xperiment 2 Fill the burette with dilute hydrochloric acid to the 0.0 cm 3 mark.E mpty the conical fl ask and rinse it with water. Using a measuring cylinder, pour 25 cm 3of solution G into the conical fl ask. Add 4 to 6 drops of phenolphthalein to the conical fl ask.A dd the hydrochloric acid from the burette 1 cm 3 at a time while shaking the flask. When the colour of the phenolphthalein changes, record in the table the volume of acid added.experimentsolution volume of hydrochloric acidadded / cm 31F 2G[4]ForExaminer’sUse(c) W hat colour change was observed when hydrochloric acid was added to the conicalfl ask?from ....................................................... to .......................................................[2](d) (i) W hich ion is present in all alkaline solutions? (1)(ii) W hat type of chemical reaction occurs when hydrochloric acid reacts with alkalinesolutions? (1)(e) (i) I n which Experiment was the greatest volume of hydrochloric acid used? (1)(ii) C ompare the volumes of hydrochloric acid used in Experiments 1 and 2. (1)(iii) S uggest an explanation for the difference in volumes..................................................................................................................................... .................................................................................................................................... (2)(f) I f Experiment 2 were repeated using 12.5 cm 3 of solution G , what volume of hydrochloricacid would be used? Explain your answer............................................................................................................................................ (2)(g) (i) S tate two sources of error in the experiments.1 ................................................................................................................................. 2 (2)(ii) S uggest two improvements to reduce the sources of error in the experiments.1 ................................................................................................................................. 2 (2)[Total: 18]ForExaminer’sUse2 Y ou are provided with two different salts, W and X . C arry out the following tests on each salt, recording all of your observations in the table. Conclusions must not be written in the table.testsobservationstests on solid W(a) D escribe the appearance of solid W . (1)(b) P lace half of solid W in a test-tube.Heat the test-tube gently . Test any gas given off with damp pH indicator paper (2)(c) A dd the rest of solid W to about 6 cm 3 of distilled water in a test-tube. C ork the test-tube and shake thecontents until dissolved. D ivide the solution into 3 equalportions in test-tubes and carry out the following tests.(i) A dd about 1 cm 3 of dilutehydrochloric acid to the fi rst portion of the solution and then add aqueous barium chloride. (ii) A dd about 1 cm 3 of dilute nitric acid to the second portion ofthe solution and then add silver nitrate solution. (iii) T o the third portion of the solutionadd about 1 cm 3 of aqueoussodium hydroxide. Heat the mixture gently and test any gasesgiven off with damp pH indicator paper............................................................................................................................................................. [2]........................................................................... [1] (2)ForExaminer’sUsetestsobservationstests on solid X(d) R epeat experiment (b) using abouthalf of the solid X . Leave the test-tube and contents to cool. This will be used in test (f) (2)(e) D issolve the rest of solid X inabout 4 cm 3 of distilled water in a test-tube. Divide the solution into 3 equal portions in test-tubes and carry out the following tests.(i) T o the fi rst portion, add excessaqueous sodium hydroxide. (ii) T o the second portion, add afew drops of hydrochloric acid, followed by aqueous barium chloride. (iii) T o the third portion, add aqueous potassium manganate(VII ) drop by drop............................................................................................................................................................. [2]........................................................................... [1] (1)(f) U sing a teat pipette, add drops of cold water to the test-tube and contents from test (d)............................................................................................................................................................. [2] (g) I dentify the gas given off in test (b)...................................................................................................................................... [1] (h) W hat conclusions can you draw about solid W ?........................................................................................................................................... ..................................................................................................................................... [2] (i) I dentify solid X ............................................................................................................................................ ........................................................................................................................................... (3)[Total: 22]Permission 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.NOTES FOR USE IN QUALITATIVE ANALYSISTest for anions aniontesttest resultcarbonate (CO 32–)add dilute acideffervescence, carbon dioxide produced chloride (C l –)[in solution]acidify with dilute nitric acid, then add aqueous silver nitrate white ppt.iodide (I –)[in solution]acidify with dilute nitric acid, then add aqueous silver nitrate yellow ppt.nitrate (NO 3–)[in solution]add aqueous sodium hydroxide then aluminium foil; warm carefully ammonia produced sulfate (SO 42–)[in solution]acidify with dilute nitric acid, then aqueous barium nitratewhite ppt.Test for aqueous cations cationeffect of aqueous sodium hydroxide effect of aqueous ammonia aluminium (A l 3+)white ppt., soluble in excess giving a colourless solutionwhite ppt., insoluble in excess ammonium (NH 4+)ammonia produced on warming –calcium (Ca 2+)white ppt., insoluble in excess no ppt., or very slight white ppt.copper (Cu 2+)light blue ppt., insoluble in excess light blue ppt., soluble in excess giving a dark blue solution iron(II ) (Fe 2+)green ppt., insoluble in excess green ppt., insoluble in excess iron(III ) (Fe 3+)red-brown ppt., insoluble in excess red-brown ppt., insoluble in excess zinc (Zn 2+)white ppt., soluble in excess giving a colourless solutionwhite ppt., soluble in excess giving a colourless solutionTest for gases gastest and test resultsammonia (NH 3)turns damp red litmus paper blue carbon dioxide (CO 2)turns limewater milky chlorine (C l 2)bleaches damp litmus paper hydrogen (H 2)‘pops’ with a lighted splint oxygen (O 2)relights a glowing splint。
IGCSE0625 官方试题2016
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 19 printed pages and 1 blank page.© UCLES 2014[Turn over*0123456789*Cambridge International ExaminationsCambridge International General Certificate of Secondary EducationPHYSICS0625/01Paper 1 Multiple Choice (Core) 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.The re are forty que stions on this pape r. Answe r all que stions. For e ach que stion the re 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. Electronic calculators may be used.Take the weight of 1.0 kg to be 10 N (acceleration of free fall = 10 m / s 2)© UCLES 2014 0625/01/SP/161Which quantity is measured in newtons? A density B energy C pressure D weight 2 A measuring cylinder is used to measure the volume of a quantity of water. Which measuring technique would not improve the accuracy of the measurement?A making sure that the measuring cylinder is verticalB making sure that the water surface is at eye levelC reading the top of the water meniscusD using the smallest measuring cylinder available that will contain all the water 3 Two distance-time graphs and two speed-time graphs are shown. Which graph represents an object that is at rest?AtimeBCtimetime4An astronaut in an orbiting spacecraft experiences a force due to gravity. This force is less than when she is on the Earth’s surface.Compared with being on the Earth’s surface, how do her mass and her weight change when she goes into orbit?mass in orbit weight in orbitA B C D decreasesdecreasesunchangedunchangeddecreasesunchangeddecreasesunchanged5The diagram shows an experiment to find the density of a liquid.liquidWhat is the density of the liquid?A 0.5g/cm3B 2.0g/cm3C 8.0g/cm3D 10.0g/cm36 An experiment is carried out to measure the extension of a rubber band for different loads.The results are shown below.load/N0 1.0 2.0 3.0length/cm15.2 16.2 18.6extension/cm 0 1.0 2.1 3.4 Which figure is missing from the table?A 17.2B 17.3C 17.4D 17.6© UCLES 2014 0625/01/SP/16 [Turn over© UCLES 2014 0625/01/SP/167 Which statement about an object moving in a straight line through air is correct? A When it accelerates, the resultant force acting on it is zero.B When it moves at a steady speed, the air resistance acting on it is zero.C When it moves at a steady speed, the resultant force acting on it is zero.D When it moves, there is a resultant force acting on it.8 The diagram shows a balance being used to find the weight of a baby. The weight of the basket can be ignored.At equilibrium, the pivot is nearer to the 40 N balancing weight than to the baby.centre of massWhat is the weight of the baby? A less than 40 N B 40 NC more than 40 ND impossible to tell without a scale on the beam 9The diagram shows four objects on a flat surface. The centre of mass of each object is marked M. Which object is about to fall over?A B C Dit started, and so has not regained all of its original gravitational potential energy.Which statement accounts for the loss of gravitational potential energy?A Energy was destroyed as the ball hit the ground.B Energy was destroyed as the ball travelled through the air.C The chemical energy and elastic energy of the ball have increased.D The internal (heat) energy of the ball and its surroundings has increased.11 Which energy resource is used to boil water to generate electricity?A hydroelectricB nuclear fissionC tidesD waves© UCLES 2014 0625/01/SP/16 [Turn over12Two farmers use an electrically powered elevator to lift bales of hay. All the bales of hay have the same mass.As sunset approaches, they increase the speed of the elevator so that more bales are lifted up ina given time.How does this affect the work done in lifting each bale and the useful output power of the elevator?work done in lifting each bale useful output power of the elevatorA B C D increasesincreasesno changeno changedecreasesincreasesdecreasesincreases© UCLES 2014 0625/01/SP/1613 A dam across a lake is divided into two sections by a rock. Section X is longer than section Y butthe two sections are otherwise identical. The water in the lake by the dam is the same depth everywhere. The diagram shows a view from above of the lake and the dam.The water creates a total force on each section of the dam and an average pressure on each section of the dam.Which statement is correct?A The average pressure on X equals the average pressure on Y.B The average pressure on X is less than the average pressure on Y.C The total force on X equals the total force on Y.D The total force on X is less than the total force on Y.© UCLES 2014 0625/01/SP/16 [Turn over© UCLES 2014 0625/01/SP/1614 The diagram shows a simple mercury barometer alongside a mercury manometer. ThevacuumWhat is the pressure of the trapped gas?A 10 cm of mercuryB 50 cm of mercuryC 66 cm of mercuryD 86 cm of mercury15The diagrams show two swimming pools. One contains fresh water and the other contains saltwater. Salt water is more dense than fresh water.At which labelled point is the pressure the greatest?fresh water (less dense)salt water (more dense)© UCLES 2014 0625/01/SP/16[Turn overSmall, bright dots of light are seen through a microscope. The dots move in rapidly changing, random directions.lightin watereyeWhat are the bright dots?A pollen grains being hit by other pollen grainsB pollen grains being hit by water moleculesC water molecules being hit by other water moleculesD water molecules being hit by pollen grains17 A sealed gas cylinder is left outside on a hot, sunny day. What happens to the average speed of the gas molecules and to the pressure of the gas in thecylinder as the temperature of the gas rises?average speed of gas molecules pressure of gas incylinderA B C D decreases decreases increases increasesdecreases increases decreases increases© UCLES 2014 0625/01/SP/1618 A pool of water evaporates. As molecules escape, the temperature of the water left in the poolchanges. From where do the molecules escape and what is the effect on the temperature of the water inthe pool?molecules escape from temperature of water in the poolA B C Dall parts of the liquid all parts of the liquid only the liquid surface only the liquid surfacedecreases increases decreases increases19 An engineer wants to fix a steel washer on to a steel rod. The rod is just too big to fit into the holeof the washer.steel rod steel washerHow can the engineer fit the washer on to the rod? A Cool the washer and then place it over the rod.B Cool the washer and rod to the same temperature and then push them together.C Heat the rod and then place it in the hole in the washer.D Heat the washer and then place it over the rod.20The diagram shows some ice being used to lower the temperature of some warm water.glassiceWhat is the main process by which the water at the bottom of the glass becomes cool?A condensationB conductionC convectionD radiation21 Which list contains only transverse waves?A infra-red waves, light waves, sound wavesB infra-red waves, light waves, ultraviolet wavesC infra-red waves, sound waves, ultraviolet wavesD light waves, sound waves, ultraviolet waves2223The diagrams show water waves that move more slowly after passing into shallow water.Which diagram shows what happens to the waves?Afastdeep water shallowwaterBfastdeepwatershallowwaterCfastdeepwatershallowwaterDfastdeepwatershallowwater24The diagram shows a ray of light incident on the edge of a piece of glass. The angle i is greater than the critical angle.Which arrow shows the direction of the ray after it leaves the edge of the glass?25In the diagram, the distance OP is the focal length of the converging lens. One ray of light from O is shown.Through which point will this ray pass, after refraction by the lens?26Light from the Sun passes through a prism and a spectrum is produced on a screen.A thermometer placed at X shows a large temperature increase.Which type of radiation causes this temperature increase?A infra-redB microwaveC ultravioletD visible light27An echo-sounder on a ship produces a pulse of sound. The echo is received by the echo-sounder after two seconds.The speed of sound in sea-water is 1500m/s.What is the depth of the sea-water below the ship?A 750mB 1500mC 3000mD 6000m28 Which frequency produces a sound that can be heard by a person?A2Hz B 10Hz C2kHz D 30kHz29The diagram shows apparatus that can be used to make a magnet.power supplymetalWhich metal and which power supply are used to make a permanent magnet?metal powersupplyA B C D ironironsteelsteel6V a.c.6V d.c.6V a.c.6V d.c.30 A polythene rod repels an inflated balloon hanging from a nylon thread.Why do the rod and balloon repel?A The rod and the balloon have opposite charges.B The rod and the balloon have like charges.C The rod is charged but the balloon is not.D The balloon is charged but the rod is not.31 A circuit is set up to determine the resistance of a resistor R. The meter readings are 2.0A and3.0V.What is the resistance of the resistor R?A 0.67ΩB 1.5ΩC 5.0ΩD 6.0Ω32 A student uses a length of wire as a resistor. He makes a second resistor from the same material.To be certain of making a second resistor of higher resistance, he should use a piece of wire that isA longer and thicker.B longer and thinner.C shorter and thicker.D shorter and thinner.33The circuit diagram shows a thermistor in a potential divider. A voltmeter is connected across the thermistor.The graph shows how the resistance of the thermistor changes with temperature.temperatureresistanceAs the thermistor becomes warmer, what happens to its resistance and what happens to the reading on the voltmeter?resistance voltmeterreadingA B C D decreasesdecreasesincreasesincreasesdecreasesincreasesdecreasesincreases34 A circuit-breaker is designed to protect a circuit which usually carries a current of 2 A.The time taken to break the circuit depends on the current, as shown in the graph.16014012010080604020002468101214161820current / A time takento break thecircuit / sWhat happens when the current in the circuit is 2 A and what happens when the current is 18 A?when the current is 2 Awhen the current is 18 AA the circuit breaks in less than 5 seconds the circuit breaks in less than 5 secondsB the circuit breaks in less than 5 secondsthe circuit does not breakC the circuit does not break the circuit breaks in less than 5 secondsDthe circuit does not breakthe circuit does not break35 A transformer has 50 turns on its primary coil and 100 turns on its secondary coil. An alternatingvoltage of 25.0 V is connected across the primary coil.primary coil 50 turns100 turnsWhat is the voltage across the secondary coil? A 12.5 VB 50.0 VC 100 VD 200 V36 A wire perpendicular to the page carries an electric current in a direction out of the page. Thereare four compasses near the wire.Which compass shows the direction of the magnetic field caused by the current?current out of page37 A wire is placed between the poles of a horseshoe magnet. There is a current in the wire in thedirection shown, and this causes a force to act on the wire.Three other arrangements, P, Q and R, of the wire and magnet are set up as shown.PQRmagnet turned aroundcurrent direction reversedcurrent direction reversed and magnet turned aroundWhich arrangement or arrangements will cause a force in the same direction as the original arrangement? A P, Q and R B P and Q only C P only D R only38 The diagram shows the paths of three different types of radiation, X, Y and Z.2 mm of plastic10 mm of aluminium50 mm of leadWhich row in the table correctly identifies X, Y and Z?X Y Z A α-particles β-particles γ-rays B β-particles α-particles γ-rays C β-particles γ-rays α-particles Dγ-raysα-particlesβ-particles39 A particular nuclide has the symbol .C 3717l What is true for atoms of this nuclide? A There are 17 nucleons in the nucleus. B There are 17 protons in the nucleus. C There are 37 electrons in the nucleus. D There are 37 neutrons in the nucleus.40 A powder contains 400 mg of a radioactive isotope that emits α-particles. The half-life of the isotope is 5 days.What mass of this isotope remains after 10 days? A 0 mgB 40 mgC 100 mgD 200 mgBLANK PAGEPermission 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.。
IChO2016国际化学奥林匹克竞赛英文真题实践部分(包括答案)
48th InternationalChemistry Olympiad Practical TasksPart I.26 July 2016Tbilisi, GeorgiaInstructions∙Begin only when the START command is given. The exam contains two parts. You have 100 minutes to work on Part I (Task 1). After this you will have to leave the lab for 30 minutes.∙Part I of the exam (Task 1) contains 5 pages, its answer sheets have 3 pages.∙Follow the safety rules announced in the preparatory tasks. You get one warning for violations. On the second warning you will get disqualified.∙Wear your lab coat and safety goggles while in the lab. Ask your lab assistant for the gloves of your size when you need them.∙Use only the pen, marker pen and calculator provided. Do not write with the marker on paper; use it only to label glass or plastic labware.∙Make sure that your student code is on every answer sheet.∙All answers must be written in the appropriate boxes on the answer sheet.Anything written elsewhere will not be graded. Use the reverse of the examsheets if you need scratch paper.∙You have no access to sinks in the lab. You are provided with a sufficient quantity of labware. Only a few items need to be used again. Wash these carefully with an appropriate solvent into the waste container. Use the brush if needed. Distilledwater and paper tissues are freely available.∙Liquid waste is to be put into the container label ed “LIQUID WASTE”. Do not put rubbish (tissues, plastic, etc.) in this container, but into the waste baskets in thelab.∙Chemicals and labware are not supposed to be refilled or replaced. Each such incident (other than the first in the entire exam, which you will be allowed) willresult in the loss of 1 point from your 40 practical points.∙Raise your hand if you have a safety question or you need a restroom break or drinking water.∙When you have finished this part of the examination, put your answer sheet into the envelope provided and leave it on the table. Do not seal the envelope. You will not have further access to the answer sheets from this part.∙You must stop your work immediately when the STOP command is given. A delay in doing this may lead to cancellation of your exam. Do not leave your place until permitted by the lab assistants. You can keep the task text.∙The official English version of this examination is available on request only for clarification.LabwareChemicalsTask 1You have 10 different compounds dissolved in water in 5 unknown solutions. Each numbered container contains two of the following compounds in aqueous solution (every compound is used, and each compound is used only once):AgNO3, Al2(SO4)3, Ba(NO3)2, Fe(NO3)3, KI, KIO3, Na2CO3, Na2SO3, MgCl2, NH3You are given HNO3 solution, NaOH solution, hexane and the aqueous solutions of the 10 pure compounds listed above.You can use empty test tubes and any of the liquids provided (including the unknowns) to identify the unknown samples. A funnel and filter paper can be used for separation. Identify the compounds in the solutions 1-5. Give the number of the solution that contains the individual compounds on the answer sheet. Indicate twoobservations caused by a chemical reaction for each compound in yourunknown mixtures by giving the letter code of the appropriate observation(choose one or more from the list), and write appropriate balanced ionicequation(s) that explain the observation. At least one of the reactions has to bespecific for clearly identifying the compound from this selection of unknowns. Note: After the STOP signal close all the centrifuge test tubes containing the unknown mixtures with the blue caps labeled with the student code and leave these in the rack.48th InternationalChemistry Olympiad Practical Tasks Part I. Answer Sheets26 July 2016Tbilisi, GeorgiaTask 1 13% of the totalOnly fill out this table when you are ready with all your assignments. Use the following observation codes:A - Formation of white precipitate F - Brown color in the organic phaseB - Formation of colored precipitate (red, brown, yellow, black etc.) G - Purple color in the organic phaseC - Dissolution of precipitate H - Formation of colored gasD - Color change in the solution I - Formation of colorless and odorless gasE - Formation of colored solution J - Formation of colorless and odorous gasK – Change in the color of precipitateReplacements:5p for locating each compound, 1 p for each relevant equation. Altogether 10x7p.Subpoints for 1p: 0.4p for correct observation with appropriate reagent(s); 0.6p for the relevant balanced ionic equation (-0.1p for minor typos; maximum of -0.3p for poor balancing; maximum of 0.3p for an equation in other than ionic form)The unknowns are identical mixtures for every student in different order. Most are mixed in 1:1 ratio by volume.Characteristic reactions are marked with bold letters. One of these or equivalent has to be shown on the answer sheet.NH3Fe(NO3)3Al2(SO4)3AgNO3KIO3Na2CO3MgCl2Na2SO3Ba(NO3)2KI48th InternationalChemistry Olympiad Practical TasksPart II.26 July 2016Tbilisi, GeorgiaInstructions∙You have a 15 minute reading time before you start work. Begin reading only when the START command is given.∙Follow the safety rules announced in the preparatory tasks. You get one warning for violations. On the second warning you will get disqualified.∙Wear your lab coat and safety goggles while in the lab. Ask your lab assistant for the gloves of your size when you need them.∙Use only the pen, marker pen and calculator provided. Do not write with the marker on paper; use it only to label glass or plastic labware.∙Make sure that your student code is on every answer sheet.∙All answers must be written in the appropriate boxes on the answer sheet.Anything written elsewhere will not be graded. Use the reverse of the examsheets if you need scratch paper.∙You have no access to sinks in the lab. You are provided with a sufficient quantity of labware. Only a few items need to be used again. Wash these carefully withappropriate solvent into the waste container. Use the brush if needed. Distilledwater and paper tissues are freely available.∙Liquid waste is to be put into the container labeled “LIQUID WASTE”. Do not put rubbish (tissues, plastic, etc.) in this container, but into the waste baskets in the lab.∙Chemicals and labware are not supposed to be refilled or replaced. Each such incident (other than the first in the entire exam, which you will be allowed) willresult in the loss of 1 point from your 40 practical points.∙Raise your hand if you have a safety question or you need a restroom break or drinking water.∙When you have finished the examination, put your answer sheet into the envelope provided and leave it on the table. Do not seal the envelope.∙You must stop your work immediately when the STOP command is given. A delay in doing this may lead to cancellation of your exam. Do not leave your place until permitted by the lab assistants. You can keep the task text.∙The official English version of this examination is available on request only for clarification.Instructions specific for Part II∙The working time for Part II (Task 2 and 3) is 200 minutes.∙Start Part II with Task 2. When you are ready to start with Task 3, tell the lab assistant, and you will receive the chemicals and labware for Task 3. Reagents for Task 2 will be taken away from you at this point.∙Part II of the exam (Task 2-3) contains 10 pages, its answer sheets have 7 pages.∙Ask the lab assistants when you need your alcohol lamp lighted. Heat only glass test tubes. Close the alcohol lamp with the cap when finished.LabwareChemicalsPeriodic table with relative atomic massesTask 2Determination of fluoride and chloride content in mineral waterGeorgia is world famous for its splendid mineral waters. Many of these are used to cure various diseases. Manufacturers have to carefully control the ionic composition of waters, fluoride and chloride being among the most important ions.Visual colorimetric detection of fluorideThe method of fluoride determination is based on the decrease in the color intensity of zirconium(IV)-Alizarin Red S complex in the presence of fluoride ions due to formation of a more stable colorless complex. The equilibrium is achieved in about 20 minutes after the reagent addition. The fluoride concentration is determined visually by comparing the color developed in the sample with those in the calibration solutions. Transfer 9.0 cm3 of mineral water from the sample into the plastic test tube label ed “X”. Calculate how much of the 9.0 mg/dm3 standard fluoride solution you will need to prepare a set of calibration solutions with the following fluoride ion content: 0.0; 1.0; 2.0; 3.5; 5.0; 6.5; 8.0 mg/dm3 (calculate for 9.0 cm3 of each solution).Using the 1.0 cm3 and 10.0 cm3 graduated pipettes, add thecalculated amounts of the standard fluoride solution to the test-tubes, then add 1.0 cm3 of Zirconyl Alizarin indicator into each testtube, and bring the volume in each calibration test tube to the 10.0cm3 mark with distilled water (the mark is shown in the figure withthe arrow).2.1.1.Report the fluoride volumes used in your dilutions.Mix the obtained solutions in the test tubes. Set the tube rack aside for at least 20 minutes.pare the color of the sample and the calibration solutions looking on themfrom the top down and from the front. Select the concentration of the standardthat is closest to the fluoride concentration of the water sample.Note: the rack with the test tubes will be photographed by the lab staff after the whole exam is finished.Standardization of silver nitrate solution by the Mohr methodTransfer 10.0 cm3 of the standard 0.0500 mol/dm3 NaCl solution into an Erlenmeyer flask using the bulb (Mohr) pipette. Add approximately 20 cm3 of distilled water and10 drops of 10% aqueous K2СгО4 solution.Fill a burette with the silver nitrate solution. Titrate the contents of the flask with the silver nitrate solution while vigorously mixing the solution containing the precipitate formed. The final titrant drops are added slowly with vigorous swirling of the flask. The titration is complete when the faint color change visible on titrant addition does not disappear in the pure yellow suspension. Take the final burette reading. Repeat the titration as necessary.2.2.1.Report your volumes on the answer sheet.2.2.2.Write balanced chemical equations for the titration of NaCl with AgNO3 and forthe end-point indication reaction.2.2.3.Calculate the concentration of the AgNO3 solution from your measurement.2.2.4.The Mohr titration method requires a neutral medium. Write down equationsfor the interfering reactions that take place at lower and at higher pH. Chloride determination by the Volhard methodWash the bulb (Mohr) pipette with distilled water. Wash the Erlenmeyer flasks first with a small portion of the ammonia solution left over from Task 1 to help removing the silver salt precipitate and then with distilled water. (In case you used up all the ammonia solution in the first task, you can get a refill without penalty.)Transfer a 10.0 cm3 aliquot of the mineral water from the sample into an Erlenmeyer flask using the bulb (Mohr) pipette. Add 5 cm3 of 2 mol/dm3 nitric acid using a graduated cylinder. Add 20.00 cm3 of the silver nitrate solution from the burette and mix well the suspension. Add appr. 2 cm3 of the indicator (Fe3+) solution with the Pasteur pipette.Fill the second burette with the standard ammonium thiocyanate solution (see the exact concentration on the label). Titrate the suspension with this solution while vigorously swirling. At the end point one drop produces a faint brown color that is stable even after intense mixing. Take the final burette reading. Repeat the titration as necessary. Note. The AgCl precipitate exchanges Cl− ions with SCN– ions from the solution. If you titrate too slowly or with breaks, the brown color disappears with time, and too much titrant is spent for the titration. Therefore when approaching the endpoint you should add the titrant at a constant slow rate swirling the flask constantly so that the suspension would stay white. The appearance of faint brown color will mean reaching the endpoint.2.3.1.Report your volumes on the answer sheet.2.3.2.Write down balanced chemical equations for the back titration with NH4SCNand that for the end-point indication reaction.2.3.3.Calculate the chloride concentration (in mg/dm3) in the water sample from yourmeasurements.2.3.4.If Br−, I−, and F− ions are present in the sample in addition to chloride, theconcentration of which ion(s) will contribute to the result of the Volhardtitration?2.3.5.When trying to determine the concentration of Cl− in the presence of otherhalides, an analyst added some potassium iodate and sulfuric acid to the sample and boiled the solution. Afterwards he reduced the excess of iodate to iodine by boiling the sample with phosphorous acid H3PO3. What interfering anions wereremoved by this operation? Write the chemical equations for the reactions ofthese ions with iodate.Task 3Identifying flavors and fragrancesTourists coming to Georgia admire many specialties, local cuisine occupying one of the top positions in the list of adventures. Excellent meat, fresh vegetables and greens, ripe fruits, home-made jams… What else is needed to satisfy true gourmets? Of course, unique flavors and fragrances!You are given 8 samples of unknown organic compounds (labeled 1 to 8), which are industrially used as flavors and fragrances. All samples are pure individual compounds. Their possible structures are found among A-M given here.The organic compounds in your unknown samples are readily soluble in ether, and insoluble in dilute aqueous NaOH and HCl. These compounds, but the unknown No. 6. are insoluble in water, the latter being slightly soluble (3.5 g/dm3).3.1.Perform test reactions described below to identify the samples 1-8. Indicate theresults of the tests by giving the Roman numeral of the appropriate observation (choose one or more from the list). Fill in all cells of the table. Use + and – toindicate positive and negative tests.3.2. Identify the unknowns based on the test results and the information givenabove. Write the structure codes (of A to M) of the identified samples in theappropriate box.Test proceduresKMnO4 test (Baeyer test)Place appr. 1 cm3 of 95% ethanol in a plastic test tube and add 1 drop of an unknown. Add 1 drop of KMnO4 solution and shake the mixture. Treat the test as positive if the permanganate color disappears immediately after shaking.3.3.Write the reaction scheme for a positive Baeyer test with one of the compoundsA-M.Cerium(IV) nitrate testPlace 2 drops of the Ce(IV) reagent into a glass test tube, add 2 drops of acetonitrile and then 2 drops of an unknown (the sequence is important!). Shake the mixture. In the case of positive test the mixture color promptly changes from yellow to orange-red.Note 1. Use only glass test tubes to perform the test. In case you need to wash the glass test tubes, carefully choose the appropriate solvent. Use caps to prevent the strong odor.Note 2. Comparison with blank (no unknown) and reference (with ethanol) tests is recommended for adequate interpretation.Note 3. Ce(IV) ions initially form brightly colored coordination compounds with alcohols. Complexes formed from primary or secondary alcohols react further (within 15 seconds to 1 hour) with the disappearance of the color.2,4dinitrophenylhydrazine (2,4-DNPH) testAdd only 1 drop of an unknown to 1 cm3 of 95% ethanol in a plastic test tube. Add 1 cm3 of the DNPH reagent to the prepared solution. Shake the mixture and let it stand for1-2 min. Observe formation of yellow to orange-red precipitate if the test is positive.3.4.Write the reaction scheme for a positive 2,4-DNPH test with one of thecompounds A-M.Ferric hydroxamate testAsk a lab assistant to light up your alcohol lamp. Mix 1 cm3 of 0.5 mol/dm3 ethanolic hydroxylamine hydrochloride solution with 5 drops of 6 mol/dm3 sodium hydroxide aqueous solution in a glass test tube. Add 1 drop of an unknown and use the alcohol lamp to heat the mixture to boiling while gently swirling the test tube to avoid splashes of the reaction mixture. Allow it to cool down slightly and add 2 cm3 of 1 mol/dm3 HCl solution. Add 1 drop of 2.5% iron(III) chloride solution. Observe appearance of magenta color if the test is positive. Close the alcohol lamp with the cap when finished.Note 1. Use glass test tubes only to perform the test; use the test tube holder when heating. In case you need to wash the glass test tubes, use an appropriate solvent. Stopper the test tubes with a green cap after completing the test to prevent a strong odor.Note 2. Fe(III) ions form a colored 1:1 complex with hydroxamic acids (R-CO-NHOH).3.5.Write the reaction scheme for a positive ferric hydroxamate test with one of thecompounds A-M.Note: After the STOP signal reattach the corresponding needles on the syringes with the unknown compounds, and place them into the plastic cup and leave them on the table.48th InternationalChemistry Olympiad Practical Part II. Answer Sheets26 July 2016Tbilisi, GeorgiaTask 2 14% of the total2.1.1. Report the fluoride volumes used in your dilutions.2.1.2.2.2.1. Report your titration volumes.2.2.2. Write a balanced chemical equation for the titration of NaCl with AgNO 3 and that for the end-point indication reaction. 2.2.3. Calculate the concentration of the AgNO 3 solution from your measurement.2.2.4.The Mohr titration method requires a neutral medium. Write equations for theinterfering reactions that take place at lower and at higher pH.2.3.1.Report your volumes on the answer sheet.2.3.2.Write a balanced chemical equation for the back titration with NH4SCN and thatfor the end-point indication reaction.2.3.3.Calculate the chloride concentration (in mg/dm3) in the water sample from yourmeasurements.2.3.4. If Br −, I −, and F − ions are present in the sample in addition to chloride, theconcentration of which ion(s) will contribute to the result of the Volhard titration? Tick the appropriate box(es). ☐ Br ––☐ F –2.3.5. halogens, an analyst added some potassium iodate and sulfuric acid to the sample and boiled the solution. Afterwards he reduced the excess of iodate to iodine by boiling the sample with phosphorous acid H 3PO 3. What interfering anions were removed by this operation?☐ Br –☐ I –☐ F –☐ noneWrite the reaction equations of these ions with iodate.Replacements:Grading scheme for the titration resultsIf A< Value < B, then Grade = Max gradeIf Value < y, then Grade = 0, If Value > z, then Grade = 0If y < Value < A, then Grade = Max grade ⨯ (Value – y)/(A – y) If B < Value < z, then Grade = Max grade ⨯ (z – Value)/(z – B)MasterValue (M.V.)M a x g r a d eAByzTask 313% of the total3.1.Indicate the results and observations of tests by giving the Roman numerals of the appropriate observations in the table. Fill in all cells of the table. Use + and – to indicate positive and negative tests. Choose one or more codes from the list below.I – Immediate disappearance of purple color VI - Formation of a yellow or orange-red precipitateII – Slow disappearance of purple color VII - Appearance of orange or red color insolutionIII - Disappearance of yellow color VIII - Appearance of magenta color IV – Formation of a brown or black precipitate IX - The unknown compound is insoluble in ethanol V - Formation of a white precipitate X – no visible changes3.2. Write the structure codes (of A to M) of the identified samples in theappropriate boxes when you are certain in your assignments.3.3.Write the reaction scheme for a positive Baeyer test with one of the compoundsA-M.3.4.Write the reaction scheme for a positive 2,4-DNPH test with one of thecompounds A-M.3.5.Write the reaction scheme for a positive ferric hydroxamate test with one of thecompounds A-M.The problem can be approached in many ways. A systematic solution for one variant of the unknown compounds encoding is given below (other variants are processed similarly).Step 1. Solubility data analysis.The data given allow excluding compounds K (presence of phenol-like moiety) and M (presence of azine nitrogen) soluble in aqueous NaOH and aqueous HCl, respectively. Step 2. Tests for the functional groups.2.1 Unsatured compounds excluding those aromatic give positive Baeyer test, and those with keto- or aldehyde group give posi tive 2,4DNPH test2.2 For avoiding mistakes in true-positive / false-positive interpretation the precise description of true-positive tests is given in the test procedures.2.3 The information given in the Notes after the test procedures CLEARLY indicates the following prompts:Analysis of the table allows unanimously identifying A, B, E, C, and G. L(Ferric hydroxamate and 2,4DNPH), J (2,4-DNPH and Cerium(IV) nitrate test), and F (KMnO4 and 2,4DNPH tests) can be excluded from further consideration, since these provide for two positive tests each.Step 3. Choosing of right structures of the samples 6 and 7 based on additional data given. Among all compounds in the list, only H and I cannot give any positive test, the attribution requiring consideration of the solubility data. Sample 7 in the above table is soluble in ether only (attributed as I), whereas Sample 6 is partially soluble in water (attributed as H).The final assignment is given below.1 points for each test (1p ⨯ 4 tests ⨯ 8 unknowns=32p)2 points for each correct assignment (2p⨯ 8 unknowns=16p)Appendix AHazard codes, provided by Globally Harmonized System of Classification and Labeling of Chemicals (not to be printed for students)Appendix B Hazard Statement Descriptions。
IGCSE 化学2016预测试卷2
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 105Iron 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 move2 iron has a high melting point due to the strong covalent bonds3 iron is an alloy4 iron is malleable because the layers of atoms can slide over one anotherA 1 onlyB 1 and 3C 1 and 4D 2, 3 and 46Which two elements react together to form an ionic compound?element electronicstructureR T X Z2,4 2,8 2,8,1 2,8,7A R and TB T and XC X and ZD Z and R 7Ethene is an unsaturated hydrocarbon.H HHH C CWhich description of the bonding in ethene is correct?A All atoms in the molecule have a share of eight electrons.B Each carbon 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.8What is the relative molecular mass, M r,of butanol?A 15B 37C 74D 148© UCLES 2014 0620/02/SP/169The chemical formulae of two substances, W and X, are given.W NaA l Si3O8X CaA l2Si2O8Which 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 2B 1 and 3C 2 and 3 D1, 2 and 310What is the concentration of a solution containing 1.0g of sodium hydroxide in 250cm3 of solution?A 0.025mol/dm3B 0.10mol/dm3C 0.25mol/dm3D 1.0mol/dm311Four students prepared hydrated copper(II) sulfate by adding an excess of dilute sulfuric acid to copper(II) oxide.Each student used a different mass of copper(II) oxide.dilute sulfuric acidCuO CuSO4.5H2OM 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 / g mass 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/16 [Turn over© 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 only15The 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 416Water can be used to produce hydrogen gas.2H2O → 2H2 + O2Which row describes bond breaking in the reactant?A B C D endothermicendothermicexothermicexothermicheat absorbedheat releasedheat absorbedheat released17 Dinitrogen tetroxide, N2O4, breaks down into nitrogen dioxide, NO2.N2O4(g) ⇌ 2NO2(g) The reaction is reversible and endothermic.Which conditions will give the largest yield of nitrogen dioxide, NO2?temperature pressureA B C D highhighlowlowhighlowhighlow© UCLES 2014 0620/02/SP/16 [Turn over© 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 over23The 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 neutralA B C D WXZZZYXWXWYXYZWY24 A solution contains barium ions and silver ions and one type of anion.What could the anion be?A chloride onlyB nitrate onlyC sulfate onlyD chloride or nitrate or sulfate25 A mixture containing two anions was tested and the results are shown below.test result dilute nitric acid added effervescence of a gas whichturned limewater milkydilute nitric acid added, followedby aqueous silver nitrateyellow precipitate formedWhich anions were present?A carbonate and chlorideB carbonate and iodideC sulfate and chlorideD sulfate and iodide© UCLES 2014 0620/02/SP/1626 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.not take place in a catalytic converter?doesWhichreactionA 2CO + O2→ 2CO2B N2 + 2CO2→ 2NO + 2COC 2NO2→ N2 + 2O2D 2NO2 + 4CO → N2 + 4CO233The diagram shows some reactions of substance Y.heat with andilute 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 acid36In an oil refinery, petroleum is separated into useful fractions.The diagram shows some of these fractions.refinery gasesgasolineXdiesel oilYZ What are fractions X, Y and Z?X Y ZA B C Dfuel oilfuel oilparaffin (kerosene)paraffin (kerosene)bitumenparaffin (kerosene)bitumenfuel oilparaffin (kerosene)bitumenfuel oilbitumen37 Which reaction does not take place in the dark?A CH4 + 2O2 → CO2 + 2H2OB CH4 +C l2 → CH3C l+ HC lC C2H4 + H2O → C2H5OHD C2H4 + H2 → C2H638Ethane 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 etheneA B C Dadditionadditionsubstitutionsubstitutionadditionsubstitutionsubstitutionaddition39Esters 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 2013 (v3) QP - Paper 5 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.You may lose marks if you do not show your working or if you do not use appropriate units.Practical notes are provided on page 8.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.CHEMISTRY0620/53Paper 5 Practical TestMay/June 20131 hour 15 minutesCandidates answer on the Question Paper.Additional Materials:As listed in the Con fi dential InstructionsUNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certi fi cate of Secondary EducationThis document consists of 6 printed pages and 2blank pages.[Turn overIB13 06_0620_53/RP © UCLES 2013*8508882337*For Examiner’s Use TotalForExaminer’sUse1Y ou are going to investigate the reaction between potassium hydrogen carbonate and two aqueous solutions of dilute hydrochloric acid of different concentrations, labelled F and G . R ead all the instructions below carefully before starting the experiments. I nstructions Y ou are going to carry out two experiments. (a) E xperiment 1U se a measuring cylinder to pour 20 cm 3 of distilled water into a conical flask. Add a 0.3 g sample of potassium hydrogen carbonate to the conical fl ask and shake the fl ask to dissolve the solid. A dd fi ve drops of methyl orange indicator to the conical fl ask.F ill the burette provided up to the 0.0 cm 3 mark with the solution F of dilute hydrochloric acid. Add acid F from the burette 1 cm 3 at a time, while shaking the fl ask, until the solution just changes colour. Record the burette readings in the table below and complete the table. (b) E xperiment 2E mpty the conical fl ask and rinse it with distilled water.P our away the contents of the burette and rinse the burette with the solution G of dilutehydrochloric acid. R epeat Experiment 1, using solution G instead of solution F .R ecord the burette readings in the table below and complete the table.Experiment 1Experiment 2fi nal reading / cm 3initial reading / cm 3difference / cm 3[6]ForExaminer’sUse(c) W hat colour change was observed in the contents of the fl ask after the hydrochloric acidwas added to the fl ask?from ............................................................ to ............................................................ [2] (d) W hat type of chemical reaction occurs when hydrochloric acid reacts with potassium hydrogen carbonate?..................................................................................................................................... [1] (e) C omplete the sentence below.E xperiment ........ needed the smallest volume of hydrochloric acid to change the colour of the methyl orange. [1](f) (i) C ompare the volumes of hydrochloric acid used in Experiments 1 and 2. (1)(ii) T he most concentrated solution of hydrochloric acid is solution .................. .[1](g) I f Experiment 2 was repeated using 0.6 g of potassium hydrogen carbonate, what volumeof hydrochloric acid would be needed? ..................................................................................................................................... [2] (h) W hat would be a more accurate method of measuring the volume of the distilled water? (1)(i) W hat would be the effect on the results if the solutions of potassium hydrogen carbonate were warmed before adding the hydrochloric acid? Give a reason for your answer.effect on results ................................................................................................................reason .......................................................................................................................... [2] (j) D escribe a different method of fi nding out which of the solutions of hydrochloric acid, For G , is the more concentrated............................................................................................................................................ ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... (3)[Total: 20]For Examiner’sUse2 Y ou are provided with two solids, H and I , which are both salts. C arry out the following tests on each solid, recording all of your observations in the table.C onclusions must not be written in the table.ForExaminer’sUse tests observationstests on solid I(d) P lace about half of solid I into a drytest-tube. Heat the test-tube gently, thenstrongly. Test the gas given off with a lighted splint.L eave the test-tube to cool for fi veminutes and then add about 1cm3 of dilutehydrochloric acid to the test-tube. Test thegas with a lighted splint. ...................................................................... . (2)...................................................................... . (2)(e)A dd the rest of solid I to about 2cm3 ofdilute nitric acid in a test-tube. Warm thesolution and smell the mixture (1)(f)W hat conclusions can you draw about solid H?........................................................................................................................................... (2)(g)W hat conclusions can you draw about solid I?........................................................................................................................................... (2)[Total: 20]Permission 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.NOTES FOR USE IN QUALITATIVE ANALYSISTest for anions aniontesttest resultcarbonate (CO 32–)add dilute acideffervescence, carbon dioxide produced chloride (C l –)[in solution]acidify with dilute nitric acid, then add aqueous silver nitrate white ppt.iodide (I –)[in solution]acidify with dilute nitric acid, then add aqueous silver nitrate yellow ppt.nitrate (NO 3–)[in solution]add aqueous sodium hydroxide then aluminium foil; warm carefully ammonia produced sulfate (SO 42–)[in solution]acidify with dilute nitric acid, then aqueous barium nitratewhite ppt.Test for aqueous cations cationeffect of aqueous sodium hydroxide effect of aqueous ammonia aluminium (A l 3+)white ppt., soluble in excess giving a colourless solutionwhite ppt., insoluble in excess ammonium (NH 4+)ammonia produced on warming –calcium (Ca 2+)white ppt., insoluble in excess no ppt., or very slight white ppt.copper (Cu 2+)light blue ppt., insoluble in excess light blue ppt., soluble in excess giving a dark blue solution iron(II ) (Fe 2+)green ppt., insoluble in excess green ppt., insoluble in excess iron(III ) (Fe 3+)red-brown ppt., insoluble in excess red-brown ppt., insoluble in excess zinc (Zn 2+)white ppt., soluble in excess giving a colourless solutionwhite ppt., soluble in excess giving a colourless solutionTest for gases gastest and test resultsammonia (NH 3)turns damp red litmus paper blue carbon dioxide (CO 2)turns limewater milky chlorine (C l 2)bleaches damp litmus paper hydrogen (H 2)‘pops’ with a lighted splint oxygen (O 2)relights a glowing splint。
九天国际教育GCSE真题June 2012 (v3) QP - Paper 5 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.Practical notes are provided on page 8.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.CHEMISTRY0620/53Paper 5 Practical TestMay/June 20121 hour 15 minutesCandidates answer on the Question Paper.Additional Materials:As listed in the Con fidential InstructionsUNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certi fi cate of Secondary EducationThis document consists of 7 printed pages and 1blank page.[Turn overIB12 06_0620_53/FP © UCLES 2012*7620311346*For Examiner’s Use TotalFor Examiner’sUse1Y ou are going to investigate what happens when two different solids, C and D , dissolve in water.R ead all the instructions below carefully before starting the experiments. I nstructions Y ou are going to carry out two experiments. (a) E xperiment 1P lace the polystyrene cup in the 250 cm 3 beaker for support.U se a measuring cylinder to pour 25 cm 3 of distilled water into the polystyrene cup.Measure the temperature of the water and record it in the table below.A dd all of solid C to the water, start the timer and stir the mixture with the thermometer.M easure the temperature of the solution every 30 seconds for three minutes. Record your results in the table.time / s306090120150180temperature of solution / °C[2](b) E xperiment 2E mpty the polystyrene cup and rinse it with water.U se a measuring cylinder to pour 25 cm 3 of distilled water into the polystyrene cup.Measure the temperature of the water and record it in the table below.A dd all of solid D to the water, start the timer and stir the mixture with the thermometer.M easure the temperature of the solution every 30 seconds for three minutes. Record your results in the table.time / s306090120150180temperature of solution / °C[2]ForExaminer’sUse(c) P lot the results for Experiments 1 and 2 on the grid and draw two smooth line graphs.C learly label your graphs.306090120150180time / st e m p e r a t u r e o f s o l u t i o n / °C[6](d) (i) F rom your graph , deduce the temperature of the solution in Experiment 1 after45 seconds. S how clearly on the graph how you worked out your answer........................... °C [2] (ii) F rom your graph , deduce how long it takes for the initial temperature of the solution in Experiment 2 to change by 1 °C.S how clearly on the graph how you worked out your answer........................... s[2]For (e)W hat type of change occurs when substance D dissolves in water?Examiner’sUse (1)(f)S uggest and explain the effect on the results if Experiment 1 was repeated using 50cm3of distilled water............................................................................................................................................ (2)(g)P redict the temperature of the solution in Experiment 2 after 1 hour. Explain your answer............................................................................................................................................ (2)(h)W hen carrying out the experiments, what would be the advantage of taking thetemperature readings every 15 seconds?........................................................................................................................................... (2)[Total: 21]ForExaminer’sUse2 Y ou are provided with solid E and liquid F . C arry out the following tests on E and F , recording all of your observations in the table.C onclusions must not be written in the table.testsobservationstests on solid E(a) D escribe the appearance of solid E . (1)(b) P lace half of solid E in a test-tube. Heat the test-tube gently.T est any gas given off....................................................................... . (3)(c) (i) A dd half of the remaining solid E to about 5 cm 3 of dilute sulfuric acid in atest-tube.A llow the mixture to settle. Decant offthe liquid into a test-tube.D ivide the solution into two equal portions in test-tubes. Add 1cm depth of distilled water to each test-tube and shake. Carry out the following tests.(ii) A dd several drops of aqueous sodiumhydroxide to the fi rst portion of the solution and shake the test-tube. N ow add excess sodium hydroxide tothe test-tube. (iii) A dd several drops of aqueousammonia to the second portion of the solution and shake the test-tube.N ow add excess aqueous ammonia to the test-tube....................................................................................................................................... [2] ...................................................................................................................................... [2] ...................................................................... ...................................................................... (3)ForExaminer’sUsetestsobservationstests on liquid F(d) D escribe the appearance and smell ofliquid F . appearance (1)smell (1)(e) U se pH indicator paper to measure the pHof liquid F . pH (1)(f) A dd about 3 cm 3 of liquid F to the rest of solid E in a test-tube. Leave to stand for fi ve minutes. ...................................................................... . (2)(g) I dentify solid E ...................................................................................................................................... [2] (h) D raw one conclusion about liquid F . (1)[Total: 19]BLANK PAGEPermission 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.NOTES FOR USE IN QUALITATIVE ANALYSISTest for anions aniontesttest resultcarbonate (CO 32–)add dilute acideffervescence, carbon dioxide produced chloride (C l –)[in solution]acidify with dilute nitric acid, then add aqueous silver nitrate white ppt.iodide (I –)[in solution]acidify with dilute nitric acid, then add aqueous silver nitrate yellow ppt.nitrate (NO 3–)[in solution]add aqueous sodium hydroxide then aluminium foil; warm carefully ammonia produced sulfate (SO 42–)[in solution]acidify with dilute nitric acid, then aqueous barium nitratewhite ppt.Test for aqueous cations cationeffect of aqueous sodium hydroxide effect of aqueous ammonia aluminium (A l 3+)white ppt., soluble in excess giving a colourless solutionwhite ppt., insoluble in excess ammonium (NH 4+)ammonia produced on warming –calcium (Ca 2+)white ppt., insoluble in excess no ppt., or very slight white ppt.copper (Cu 2+)light blue ppt., insoluble in excess light blue ppt., soluble in excess giving a dark blue solution iron(II ) (Fe 2+)green ppt., insoluble in excess green ppt., insoluble in excess iron(III ) (Fe 3+)red-brown ppt., insoluble in excess red-brown ppt., insoluble in excess zinc (Zn 2+)white ppt., soluble in excess giving a colourless solutionwhite ppt., soluble in excess giving a colourless solutionTest for gases gastest and test resultsammonia (NH 3)turns damp red litmus paper blue carbon dioxide (CO 2)turns limewater milky chlorine (C l 2)bleaches damp litmus paper hydrogen (H 2)‘pops’ with a lighted splint oxygen (O 2)relights a glowing splint。
化学IGCSE试卷
Additional Materials:
Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended)
0620/11 May/June 2011
45 Minutes
READ THESE INSTRUCTIONS FIRST
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.
Which substances are used for the overhead cables and for the electrodes?
overhead cables
A
aluminium
B
aluminium
C
copper
D
platinum
electrodes copper platinum platinum
2 An aqueous solution is coloured. Which method of separation would show that the solution contains ions of different colours? A chromatography B crystallisation C distillation D filtration
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Total MarksPaper Reference
Turn over P45930A©2016 Pearson Education Ltd.1/1/1/1/1/1/
*P45930A0120*
Chemistry/Additional ScienceUnit C2: Discovering ChemistryHigher TierWednesday 15 June 2016 – AfternoonTime: 1 hour5CH2H/01
You must have:Calculator, ruler
Instructions•
Use black ink or ball-point pen.•
Fill in the boxes at the top of this page with your name, centre number and candidate number.•
Answer all questions.•
Answer the questions in the spaces provided – there may be more space than you need.
Information•
The total mark for this paper is 60.•
The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question.•
Questions labelled with an asterisk (*) are ones where the quality of your written communication will be assessed – you should take particular care with your spelling, punctuation and grammar, as well as the clarity of expression, on these questions.
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Pearson Edexcel GCSE
PhysicsAndMathsTutor.com2*P45930A0220*
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREAThe Periodic Table of the E
l
ements
* The lanthanoids (atomic numbers 58-71) and the actinoids (atomic numbers 90-103) have been omitted. The relative atomic masses of copper and chlorine have not been rounded to the nearest whole number.
1 2 3 4 5 6 7 0 Key 1 H hydrogen 1 4 He helium 2 7 Li lithium 3 9 Be beryllium 4 relative atomic mass atomic symbol
name
atomic (proto
n) number
11 B
bor
o
n
5
12 C
carb
o
n 6
14 N
nitrogen 7 16 O oxygen 8 19 F fluorine 9 20 Ne neon 10 23 Na sodium 11 24 Mg magnesium 12 27 Al aluminium 13 28 Si silicon 14 31 P phosphorus 15 32 S sulfur 16 35.5 Cl chlorine 17 40 Ar argon 18 39 K potassium 19 40 Ca calcium 20 45 Sc scandium 21 48 Ti titanium 22 51 V vanadium 23 52 Cr chromium 24 55 Mn manganese 25 56 Fe iron 26 59 Co cobalt 27 59 Ni nickel 28 63.5 Cu copper 29 65 Zn zinc 30 70 Ga gallium 31 73 Ge germanium32 75 As arsenic 33 79 Se selenium 34 80 Br bromine 35 84 Kr krypton 36 85 Rb rubidium 37 88 Sr strontium 38 89 Y yttrium 39 91 Zr zirconium 40 93 Nb niobium 41 96 Mo molybdenum 42 [98] Tc technetium 43 101 Ru ruthenium 44 103 Rh rhodium 45 106 Pd palladium 46 108 Ag silver 47 112 Cd cadmium 48 115 In indium 49 119 Sn tin 50 122 Sb antim
o
ny
51 128 Te tellurium 52 127 I iodine 53 131 Xe xenon 54 133 Cs caesium 55 137 Ba barium 56 139 La* lanthanum 57 178 Hf hafnium 72 181 Ta tantalum 73 184 W tungsten 74 186 Re rhenium 75 190 Os osmium 76 192 Ir iridium 77 195 Pt platinum 78 197 Au gold 79 201 Hg mercury 80 204 Tl thallium 81 207 Pb lead 82 209 Bi bismuth 83
[209] Po
poloni
u
m
84
[210] At
astati
n
e
85
[222] Rn
rado
n
86
[223] Fr
franci
u
m
87
[226] Ra
radiu
m
88
[227] Ac*
actiniu
m
89
[261] Rf
rutherfor
di
um
104
[262] Db
dubniu
m
105
[266] Sg seaborgium 106 [264] Bh bohrium 107 [277] Hs
hassiu
m
108
[268] Mt
meitner
i
u
m
109
[271] Ds
darmstad
t
i
um
110
[272] Rg
roentgen
i
um
111
Elements with atomic numbers 112-116 have been reported but not fully authenticated
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