Question 1

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

Accepted Answer

A) Fe(Cl·6H2O)3 
B) Fe3Cl·6H2O 
C) FeCl3(H2O)6 
D) Fe3Cl(H2O)6 
E) FeCl3·6H2O 
A) Fe(Cl·6H2O)3 
B) Fe3Cl·6H2O 
C) FeCl3(H2O)6 
D) Fe3Cl(H2O)6 
E) FeCl3·6H2O

Question 2

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

Accepted Answer

a.nonmetal
b.metallo

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

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.

Accepted Answer

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

Question 5

What is the name of PCl3?

Accepted Answer

A) phosphorus chloride 
B) phosphoric chloride 
C) phosphorus trichlorate 
D) trichlorophosphide 
E) phosphorus trichloride 
A) phosphorus chloride 
B) phosphoric chloride 
C) phosphorus trichlorate 
D) trichlorophosphide 
E) phosphorus trichloride

Question 6

Which of the following compounds is ionic?

Accepted Answer

A) PF3 
B) CS2 
C) HCl 
D) SO2 
E) MgCl2 
A) PF3 
B) CS2 
C) HCl 
D) SO2 
E) MgCl2

Question 7

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.

Accepted Answer

A) 1.792 mass % 
B) 24.80 mass % 
C) 30.81 mass % 
D) 34.12 mass % 
E) 55.81 mass % 
A) 1.792 mass % 
B) 24.80 mass % 
C) 30.81 mass % 
D) 34.12 mass % 
E) 55.81 mass %

Question 8

What is the name of P4Se3?

Accepted Answer

A) phosphorus selenide 
B) phosphorus triselenide 
C) tetraphosphorus selenide 
D) phosphoric selenide 
E) tetraphosphorus triselenide 
A) phosphorus selenide 
B) phosphorus triselenide 
C) tetraphosphorus selenide 
D) phosphoric selenide 
E) tetraphosphorus triselenide

Question 9

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

Accepted Answer

A) NH4+ ammonium 
B) S2- sulfide 
C) CN- cyanide 
D) S2O32- thiosulfate 
E) ClO3- perchlorate 
A) NH4+ ammonium 
B) S2- sulfide 
C) CN- cyanide 
D) S2O32- thiosulfate 
E) ClO3- perchlorate

Question 10

Which of the following compounds is covalent?

Accepted Answer

A) CaCl2 
B) MgO 
C) Al2O3 
D) Cs2S 
E) PCl3 
A) CaCl2 
B) MgO 
C) Al2O3 
D) Cs2S 
E) PCl3

Question 11

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

Accepted Answer

A) O2- oxide 
B) Cd2+ cadmium 
C) ClO3- chlorate 
D) HCO3- hydrogen carbonate 
E) NO2- nitrate 
A) O2- oxide 
B) Cd2+ cadmium 
C) ClO3- chlorate 
D) HCO3- hydrogen carbonate 
E) NO2- nitrate

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

Thomson measured m/e,the mass-

Question 14

A column of the periodic table is called a

Accepted Answer

A) group 
B) period 
C) isotopic mixture 
D) pillar 
E) shell 
A) group 
B) period 
C) isotopic mixture 
D) pillar 
E) shell

Question 15

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

Accepted Answer

A) manganese disulfate 
B) manganese(II)sulfate 
C) manganese(IV)sulfate 
D) manganese sulfate 
E) manganese(I)sulfate 
A) manganese disulfate 
B) manganese(II)sulfate 
C) manganese(IV)sulfate 
D) manganese sulfate 
E) manganese(I)sulfate

Question 16

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).

Accepted Answer

The answer of Fill in the blank spaces and write...

Question 17

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

Accepted Answer

A) 261.97 amu 
B) 238.98 amu 
C) 161.97 amu 
D) 138.98 amu 
E) 74.99 amu 
A) 261.97 amu 
B) 238.98 amu 
C) 161.97 amu 
D) 138.98 amu 
E) 74.99 amu

Question 18

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?

Accepted Answer

A) cobalt dichloride 
B) cobalt(II)chloride 
C) cobalt chloride 
D) cobaltic chloride 
E) copper(II)chloride 
A) cobalt dichloride 
B) cobalt(II)chloride 
C) cobalt chloride 
D) cobaltic chloride 
E) copper(II)chloride

Question 19

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?

Accepted Answer

A) 92.50% 
B) 86.66% 
C) 46.16% 
D) 7.503% 
E) 6.080% 
A) 92.50% 
B) 86.66% 
C) 46.16% 
D) 7.503% 
E) 6.080%

Question 20

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

Accepted Answer

a.70.90 am

Exam 2: The Components of Matter

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

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

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

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.

What is the name of PCl3?

Which of the following compounds is ionic?

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.

What is the name of P4Se3?

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

Which of the following compounds is covalent?

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.

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

A column of the periodic table is called a

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

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).

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

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?

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

Keys to the Study of Chemistry

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Properties of Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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.

What is the name of PCl₃?

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.

What is the name of P₄Se₃?

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

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?

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