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Exam 2: The Components of Matter

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Question 21

Multiple Choice

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Which one of the following combinations of names and formulas of ions is incorrect?

A) NH₄⁺ ammonium
B) S^2- sulfide
C) CN^- cyanide
D) S₂O₃^2- thiosulfate
E) ClO₃^- perchlorate

F) B) and E)
G) B) and C)

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Question 22

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Silicon,which makes up about 25% of Earth's crust by mass,is used widely in the modern electronics industry.It has three naturally occurring isotopes,²⁸Si,²⁹Si,and ³⁰Si.Calculate the atomic mass of silicon.

A) 29.2252 amu
B) 28.9757 amu
C) 28.7260 amu
D) 28.0855 amu
E) 27.9801 amu

F) C) and D)
G) A) and B)

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Question 23

Multiple Choice

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The substance,CoCl₂,is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air.What is its name?

For each of the following elements,indicate whether it is a metal,a non-metal or a metalloid: a.S b.Ge c.Hg d.H e.I f.Si

Fill in the blank spaces and write out all the symbols in the left hand column in full,in the form (i.e. ,include the appropriate values of Z and A as well as the correct symbol X).

What is the name of P₄Se₃?

Which of the following compounds is ionic?

What is the name of PCl₃?

A column of the periodic table is called a

Which one of the following combinations of names and formulas of ions is incorrect?

The molecular formula of a compound provides more information than its structural formula.

Iron (III) chloride hexahydrate is used as a coagulant for sewage and industrial wastes.What is its formula?

Sodium chromate is used to protect iron from corrosion and rusting.Determine its molecular mass.

A red glaze on porcelain can be produced by using MnSO₄.What is its name?

State the two important experimental results (and the names of the responsible scientists)which enabled the mass of the electron to be determined.

Lithium forms compounds which are used in dry cells and storage batteries and in high-temperature lubricants.It has two naturally occurring isotopes,⁶Li (isotopic mass = 6.015121 amu) and ⁷Li (isotopic mass = 7.016003 amu) .Lithium has an atomic mass of 6.9409 amu.What is the percent abundance of lithium-6?

Kaolinite,a clay mineral with the formula Al₄Si₄O₁₀(OH) ₈,is used as a filler in slick-paper for magazines and as a raw material for ceramics.Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen.Calculate the mass percent of oxygen in kaolinite.

Calculate the molecular masses of the following: a.Cl₂ b.H₂O₂ c.(NH₄)₂SO₄ d.Ba(NO₃)₂

Which of the following compounds is covalent?

Modern studies have shown that the Law of Multiple Proportions is not valid.