Polyatomic Ions Writing Formulas Naming Compunds多原子离子的写作命名化合物公式
化学物质解读
Ans: FeSO4
Ans: FeCl3
Ans: CaCl2
11
Common Monatomic Ions of Main-Group Elements
IA (1) IIA (2) IIIA (13) IVA
(14)
VA (15)
VIA (16)
VIIA (17)
1.
2. Li+ Be2+ B C N3O2-
1.
17
Group 7: fluorine fluoride F-; bromine bromide Br-; chlorine chloride Cl-; iodine iodide I-
Oxyanions Suffixes tell you the number of oxygen atoms in the anions = -ate e.g nitrate NO3-, sulfate SO42 = -ite e.g. nitrite NO2-, sulfite SO32-
Hydrogen sulfate (or bisulfate) (硫酸氫根) Thiosulfate (硫代硫硝根)
HSO3HSO4S2O3214
Permanganate (過錳酸根) MnO4-
Naming Simple Compounds
Systematic naming of chemical compounds Monoatomic ion = an ion formed from a single atom. e.g. Na+ Polyatomic ion = an ion of atoms chemically bonded together carrying net charges, e.g. SO42Naming: Cation + Anion (sodium chloride)
polynomials 词根
一、polynomials 词根的定义polynomial 是由两个词根组成的，分别是 poly 和 nomial。
其中，poly 源自希腊语，意为“多”，nomial 则来自拉丁语 nomen，意为“名称”或“命名”。
polynomial 这个词的字面意思是“有多个名称的”，在数学上指的是由多个项构成的代数式。
二、polynomial 的基本概念1. 代数式的构成在数学中，代数式由多个项以加减法连接而成。
而一个 polynomial 就是一个包含多个项的代数式，其中每一项都是一个系数与一个或多个变量的乘积。
3x^2 - 2x + 5 就是一个 polynomial。
2. polynomial 的次数一个 polynomial 的次数是指该 polynomial 中变量的最高次幂。
在代数式3x^2 - 2x + 5中，x^2 的次数是2，所以这个代数式的次数就是2。
次数为0的 polynomial 被称为常数。
3. polynomial 的系数在一个 polynomial 中，各个项的系数是指与变量相乘的常数。
在代数式3x^2 - 2x + 5中，3、-2 和5就分别是各个项的系数。
三、polynomial 在数学中的应用1. 代数方程的求解在数学中，polynomial 经常用来表示代数方程。
通过对 polynomial 的分解、化简和整理，可以帮助我们更好地理解和求解各种代数方程。
2. 描述多项式函数多项式函数是一种常见的数学函数形式，它们在数学和科学领域中有着广泛的应用。
通过对 polynomial 的研究，我们可以更好地理解多项式函数的性质和特点。
3. 数据拟合在统计学和数据分析中，polynomial 也常常被用来进行数据的拟合和预测。
通过拟合 polynomial 函数，可以帮助我们更好地理解数据的规律和趋势。
四、对 polynomial 的研究和发展1. polynomial 的历史对 polynomial 的研究可以追溯到古希腊时期。
唐山“PEP”2024年10版小学四年级下册J卷英语第4单元期末试卷
唐山“PEP”2024年10版小学四年级下册英语第4单元期末试卷考试时间：80分钟（总分:140）A卷考试人：_________题号一二三四五总分得分一、综合题(共计100题)1、What is the capital of the Czech Republic?A. PragueB. BratislavaC. BudapestD. Warsaw答案:A. Prague2、填空题：I love to play ________ (桌游) with my family.3、What is the process of changing from a liquid to a solid called?A. FreezingB. BoilingC. MeltingD. Evaporating答案: A4、听力题：The chemical formula for magnesium oxide is _______.5、What is the name of the imaginary line that divides the Earth into Eastern and Western Hemispheres?A. EquatorB. Prime MeridianC. Tropic of CancerD. Tropic of Capricorn答案: B6、听力题：She paints a _____ (画).A shooting star is actually a ______ entering the Earth's atmosphere.8、听力题：An experiment must be ______ (repeatable) to be scientifically valid.9、听力题：The chemical symbol for polonium is _______.10、填空题：My favorite subject in school is ______.11、What is the capital of Italy?A. ParisB. MadridC. RomeD. Berlin答案:C12、填空题：In my culture, we often greet each other with "Good morning, ."(在我的文化中，我们常常用“早上好，”互相问候。
计算器使用指南说明书
Candidates may use any calculator allowed by the regulations of theJoint Council for Qualifications. Calculators must not have the facilityfor symbolic algebra manipulation, differentiation and integration, orhave retrievable mathematical formulae stored in them.Instructionst Use black ink or ball-point pen.t I f pencil is used for diagrams/sketches/graphs it must be dark (HB or B).Coloured pencils and highlighter pens must not be used.t Fill in the boxes at the top of this page with your name,centre number and candidate number.t A n swer all questions and ensure that your answers to parts of questions areclearly labelled.t A nswer the questions in the spaces provided– there may be more space than you need.t Y ou should show sufficient working to make your methods clear. Answerswithout working may not gain full credit.t V alues from the statistical tables should be quoted in full. When a calculator is used, the answer should be given to an appropriate degree of accuracy.Informationt The total mark for this paper is 75.t 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.Advicet Read each question carefully before you start to answer it.t Try to answer every question.tCheck your answers if you have time at the end.*P44847A0124*Turn over P44847A©2015 Pearson Education Ltd.5/1/1/2*P44847A0224*3Turn over*P44847A0324*4*P44847A0424*5Turn over*P44847A0524*6*P44847A0624*7Turn over*P44847A0724*8*P44847A0824*9Turn over*P44847A0924*10*P44847A01024*21Turn over*P44847A02124*22*P44847A02224*23 *P44847A02324*24*P44847A02424*。
数学油画的英语作文
**Title: The Connection Between Mathematics and Oil Painting**Mathematics and art may seem like two completely different subjects, but they actually share a deep and fascinating connection. Oil painting, in particular, incorporates many mathematical concepts that help create beautiful and harmonious artworks. In this essay, I will explore how mathematics plays a vital role in oil painting.Firstly, geometry is essential in oil painting. Artists use geometric shapes to compose their works effectively. For instance, the principles of symmetry and balance help create a sense of harmony in a painting. When artists proportionate the size of different elements in their artwork, they often rely on geometric ratios. This technique ensures that the composition feels pleasing to the eye.Secondly, perspective is another important mathematical concept in oil painting. The use of linear perspective allows artists to create the illusion of depth and space in a two-dimensional artwork. By applying vanishing points and horizon lines, painters can depict objects that appear to recede into the background, making the scene more realistic. This technique requires a solid understanding of angles and proportions, showcasing the application of math in capturing three-dimensionality.Moreover, color theory, which involves understanding how colors interact, is also influenced by mathematics. Artists often use color wheels and value scales to determine which colors will complement each other. Mixing colors involves ratios, as artists must calculate how much of each color to combine to achieve the desired hue. This blending process illustrates how math is used even in the choice of colors.In conclusion, mathematics is an integral part of oil painting, influencing composition, perspective, and color theory. By understanding these mathematical principles, artists are able to create stunning works of art that captivate viewers. The connection between math and art enriches both fields, demonstrating that they are not as different as they may initially seem. Embracing this relationship allows us to appreciate the beauty of art in a new light.。
Polyatomic Ions Writing Formulas Naming Compounds多原子离子的写作命名化合物公式
Mg3(SO4)2
• Name the metal. Magnesium
• Name the polyatomic ion from the ion chart. Sulfate
• Name the compound. Magnesium Sulfate
Polyatomic Ions
Writing Formulas / Naming Compounds
• A polyatomic ion is a covalent molecule that has an ionic charge. (As opposed to being a neutral molecule.)
Answers
• Li2SO4 • Ca(C2H3O2)2 • Al(NO3)3 • Mg3(PO4)2 • Na2CO3
Some Additional Examples
• Calcium Hydroxide
Ca+2
OH-1
• The least common factor is 2. Therefore, 1 calcium ion will bond with 2 hydroxide ions to form a neutral compound.
• Determine the common factor of the two oxidation numbers. In this case, 2.
• Decide how many of each ion is needed to equal the common factor. In this case, 2 sodium ions and 1 sulfate ion.
英语作文填充的废话翻译
英语作文填充的废话翻译Sure, here's a draft for you:---。
Title: The Art of Filling English Essays with Fluff。
When it comes to crafting English essays, one mightfind themselves grappling with the need to fill the pages with eloquent prose and insightful analysis. However, in the pursuit of verbosity, one must tread cautiously to avoid the pitfalls of banality. Herein lies the art of filling essays with fluff – the delicate balance between substance and style.First and foremost, it is imperative to establish a solid foundation of content. This entails thorough research and a comprehensive understanding of the topic at hand. Armed with a plethora of information, one can proceed to embellish their prose with carefully curated details andanecdotes. This not only adds depth to the narrative but also demonstrates the author's erudition and mastery of the subject matter.Moreover, the judicious use of literary devices can greatly enhance the richness of one's writing. Metaphors, similes, and personification serve as potent tools in the arsenal of the adept wordsmith, enabling them to paintvivid imagery and evoke visceral emotions in the reader. By imbuing their prose with such embellishments, the author transforms mundane ideas into captivating narratives that linger in the reader's mind long after the final paragraph.Furthermore, the art of filling essays with fluff extends beyond mere linguistic embellishments. Structural nuances such as parallelism, rhetorical questions, and thematic cohesion play a pivotal role in elevating the overall quality of the composition. By employing these techniques, the author not only captivates the reader's attention but also imbues their work with a sense of coherence and sophistication.However, it is crucial to exercise restraint in the pursuit of verbosity. Overindulgence in flowery languageand gratuitous embellishments can detract from the clarity and coherence of the essay, leaving the reader bewildered and disenchanted. Hence, it is incumbent upon the author to strike a delicate balance between eloquence and conciseness, ensuring that every word serves a purpose and contributesto the overarching narrative.In conclusion, the art of filling English essays with fluff is a nuanced endeavor that requires finesse, diligence, and a keen understanding of the intricacies of language. By judiciously employing literary devices, structural nuances, and thematic coherence, the author can elevate their prose to new heights of eloquence and sophistication. However, it is imperative to exercise restraint and avoid succumbing to the temptations of verbosity. Ultimately, it is the seamless integration of substance and style that distinguishes a truly exceptional essay from mere prose.--。
Numerical Recipes in C the art of scientific computing 2nd ed
(1.5) U0(x; a; b) = 1; U1(x; a; b) = x(1 + a); (1.6) Un+1(x; a; b) = x(1 + aqn)Un(x; a; b) ? bqn?1Un?1(x; a; b); n 1:
To indicate the dependence of Un(x; a; b) on q, when necessary we will use the notation Un(x; a; bjq). In accordance with the theory of orthogonal polynomials 4], the numerator polynomials fUn(x; a; b)g satisfy the recursion in (1.6) and the initial conditions (1.7) U0 (x; a; b) = 0; U1 (x; a; b) = 1 + a: Therefore (1.8) Un(x; a; b) = (1 + a)Un?1(x; qa; qb): Schur 8] actually considered the polynomials Un(1; 0; ?q) and Un(1; 0; ?q). In the notation of (1.2) and (1.3) we have (1.9) Dn = Un+1(1; 0; ?q); En = Un+1(1; 0; ?q) = Un(1; 0; ?q2):
(2.2) Schurn = Dn+m + En+m:
We can determine the parameters and using the initial conditions Schur0 = 1, Schur1 = 1 + q1+m, which leads to the evaluations
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Calcium Phosphate
Ca +2 PO4 -3
• Determine the common factor of the two oxidation numbers. In this case, 6.
• Write names for the following compounds. CaCO3 Al2(SO4)3 Ca(ClO3)2 K3PO4 Mg(OH)2
Answers
• Calcium carbonate • Aluminum sulfate • Calcium chlorate • Potassium phosphate • Magnesi4)2
• Notice that the polyatomic ion must be placed in
parenthesis or, instead of 2 phosphate ions, you
would have 42 Oxygen atoms and 1 Phosphorus
Now, these!
• Write formulas for the following compounds. Lithium sulfate Calcium acetate Aluminum nitrate Magnesium phosphate Sodium carbonate
atom.
Ca3PO42
Naming Compounds w/ Polyatomic Ions
KClO3
• Write the name of the metal. Potassium
• Write the name of the polyatomic ion from the ion chart. Chlorate
• Decide how many of each ion is needed to equal the common factor. In this case, 3 calcium ions and 2 phosphate ions.
• Write these numbers as the subscript for each ion.
• Name the compound. Potassium Chlorate
Mg3(SO4)2
• Name the metal. Magnesium
• Name the polyatomic ion from the ion chart. Sulfate
• Name the compound. Magnesium Sulfate
oxidation number from the periodic table. Na+1
• Write the formula for the polyatomic ion from the ion chart. Add its oxidation number. SO4-2
Sodium Sulfate Na +1 SO4-2
Ca(OH)2 • If you omitted the parenthesis, you would not have
2 hydroxide ions. Instead you would have 2 hydrogen atoms and one oxygen atom. CaOH2
Try these
Nitrate = NO3-1
Phosphate = PO4-3
Chlorate = ClO3-1
Carbonate
CO3-2
• Notice the ending has changed to –ate.
Writing Formulas
Sodium Sulfate • Write the formula for the metal. Add the
Some Additional Examples
• Calcium Hydroxide
Ca+2
OH-1
• The least common factor is 2. Therefore, 1 calcium ion will bond with 2 hydroxide ions to form a neutral compound.
• Write these numbers as the subscript for each ion.
Na2SO4
Calcium Phosphate
• Write the formula for the metal. Add the oxidation number from the periodic table. Ca+2
Answers
• Li2SO4 • Ca(C2H3O2)2 • Al(NO3)3 • Mg3(PO4)2 • Na2CO3
• Poly = many • Atomic = atoms • Ion = charged particle • A charged particle that consists of more
than one atom.
Polyatomic Ions
Examples:
Sulfate = SO4-2
Polyatomic Ions
Writing Formulas / Naming Compounds
• A polyatomic ion is a covalent molecule that has an ionic charge. (As opposed to being a neutral molecule.)
• Determine the common factor of the two oxidation numbers. In this case, 2.
• Decide how many of each ion is needed to equal the common factor. In this case, 2 sodium ions and 1 sulfate ion.