Question 1

Chlorine dioxide is a strong oxidizer that is used for bleaching flour and textiles and for purification of water. What is its formula?

Accepted Answer

A)  (ClO)2 
B)  Cl2O 
C)  Cl2O2 
D)  Cl2O4 
E)  ClO2 
A)  (ClO)2 
B)  Cl2O 
C)  Cl2O2 
D)  Cl2O4 
E)  ClO2

Question 2

Which one of the following formulas of ionic compounds is the least likely to be correct?

Accepted Answer

A)  NH4Cl 
B)  Ba(OH)2 
C)  Na2SO4 
D)  Ca2NO3 
E)  Cu(CN)2 
A)  NH4Cl 
B)  Ba(OH)2 
C)  Na2SO4 
D)  Ca2NO3 
E)  Cu(CN)2

Question 3

The formula C9H20 is an empirical formula.

Accepted Answer

A) True 
 B)False

Question 4

What is the formula for lead (II) oxide?

Accepted Answer

A)  PbO 
B)  PbO2 
C)  Pb2O 
D)  PbO4 
E)  Pb2O3 
A)  PbO 
B)  PbO2 
C)  Pb2O 
D)  PbO4 
E)  Pb2O3

Question 5

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 6

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

Accepted Answer

A) True 
 B)False

Question 7

The colorless substance, MgF2, is used in the ceramics and glass industry. What is its name?

Accepted Answer

A)  magnesium difluoride 
B)  magnesium fluoride 
C)  magnesium(II) fluoride 
D)  monomagnesium difluoride 
E)  None of these choices is correct since they are all misspelled. 
A)  magnesium difluoride 
B)  magnesium fluoride 
C)  magnesium(II) fluoride 
D)  monomagnesium difluoride 
E)  None of these choices is correct since they are all misspelled.

Question 8

What is the formula for magnesium sulfide?

Accepted Answer

A)  MgS 
B)  MgS2 
C)  Mg2S 
D)  Mg2S3 
E)  MgSO4 
A)  MgS 
B)  MgS2 
C)  Mg2S 
D)  Mg2S3 
E)  MgSO4

Question 9

Copper (Cu) is a transition metal.

Accepted Answer

A) True 
 B)False

Question 10

Which one of the following formulas of ionic compounds is the least likely to be correct?

Accepted Answer

A)  CaCl2 
B)  NaSO4 
C)  MgCO3 
D)  KF 
E)  Cu(NO3)2 
A)  CaCl2 
B)  NaSO4 
C)  MgCO3 
D)  KF 
E)  Cu(NO3)2

Question 11

The formula of heptane is:

Accepted Answer

A)  C6H12 
B)  C6H14 
C)  C7H14 
D)  C7H16 
E)  C8H16 
A)  C6H12 
B)  C6H14 
C)  C7H14 
D)  C7H16 
E)  C8H16

Question 12

Which of the following is a metalloid?

Accepted Answer

A)  carbon, C, Z = 6 
B)  sulfur, S, Z = 16 
C)  germanium, Ge, Z = 32 
D)  iridium, Z = 77 
E)  bromine, Br, Z = 35 
A)  carbon, C, Z = 6 
B)  sulfur, S, Z = 16 
C)  germanium, Ge, Z = 32 
D)  iridium, Z = 77 
E)  bromine, Br, Z = 35

Question 13

In the ionic compound with the general formula M2X3, the likely charge on X is:

Accepted Answer

A)  +1 
B)  +3 
C)  -1 
D)  -2 
E)  -3 
A)  +1 
B)  +3 
C)  -1 
D)  -2 
E)  -3

Question 14

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 15

For each of the following names, write down the corresponding formula, including charge where appropriate (atomic numbers and mass numbers are not required):
A) zinc ion
B) nitrite ion
C) carbonic acid
D) cyanide ion

Accepted Answer

a. Zn²⁺ b.

Question 16

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

Accepted Answer

A)  Ba2+ barium 
B)  S2- sulfate 
C)  CN- cyanide 
D)  ClO4- perchlorate 
E)  HCO3- bicarbonate 
A)  Ba2+ barium 
B)  S2- sulfate 
C)  CN- cyanide 
D)  ClO4- perchlorate 
E)  HCO3- bicarbonate

Question 17

In a Millikan oil-drop experiment, the charges on several different oil drops were as follows: -5.92; -4.44; -2.96; -8.88. The units are arbitrary. What is the likely value of the electronic charge in these arbitrary units?

Accepted Answer

A)  -1.11 
B)  -1.48 
C)  -2.22 
D)  -2.96 
E)  -5.55 
A)  -1.11 
B)  -1.48 
C)  -2.22 
D)  -2.96 
E)  -5.55

Question 18

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 19

Which of the following symbols does not represent an element?

Accepted Answer

A)  O2 
B)  Co 
C)  HF 
D)  Cs 
E)  Xe 
A)  O2 
B)  Co 
C)  HF 
D)  Cs 
E)  Xe

Question 20

Zinc acetate is used in preserving wood and in manufacturing glazes for porcelain. What is its formula?

Accepted Answer

A)  ZnAc2 
B)  ZnCH3COO 
C)  Zn(CH3COO)2 
D)  Zn2CH3COO 
E)  ZnCH3COCH3 
A)  ZnAc2 
B)  ZnCH3COO 
C)  Zn(CH3COO)2 
D)  Zn2CH3COO 
E)  ZnCH3COCH3

Exam 2: The Components of Matter

Chlorine dioxide is a strong oxidizer that is used for bleaching flour and textiles and for purification of water. What is its formula?

Which one of the following formulas of ionic compounds is the least likely to be correct?

The formula C9H20 is an empirical formula.

What is the formula for lead (II) oxide?

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

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

The colorless substance, MgF2, is used in the ceramics and glass industry. What is its name?

What is the formula for magnesium sulfide?

Copper (Cu) is a transition metal.

Which one of the following formulas of ionic compounds is the least likely to be correct?

The formula of heptane is:

Which of the following is a metalloid?

In the ionic compound with the general formula M2X3, the likely charge on X is:

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.

For each of the following names, write down the corresponding formula, including charge where appropriate (atomic numbers and mass numbers are not required): A) zinc ion B) nitrite ion C) carbonic acid D) cyanide ion

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

In a Millikan oil-drop experiment, the charges on several different oil drops were as follows: -5.92; -4.44; -2.96; -8.88. The units are arbitrary. What is the likely value of the electronic charge in these arbitrary units?

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

Which of the following symbols does not represent an element?

Zinc acetate is used in preserving wood and in manufacturing glazes for porcelain. What is its formula?

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 Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

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 Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

The formula C₉H₂₀ is an empirical formula.

The colorless substance, MgF₂, is used in the ceramics and glass industry. What is its name?

In the ionic compound with the general formula M₂X₃, the likely charge on X is:

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.