Question 1

The mass of a neutron is equal to the mass of a proton plus the mass of an electron.

Accepted Answer

A) True 
 B)False

Question 2

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 3

What is the name of the acid formed when HBr gas is dissolved in water?

Accepted Answer

A) Bromic acid 
B) Bromous acid 
C) Hydrobromic acid 
D) Hydrobromous acid 
E) Hydrobromidic acid 
A) Bromic acid 
B) Bromous acid 
C) Hydrobromic acid 
D) Hydrobromous acid 
E) Hydrobromidic acid

Question 4

When an alkali metal combines with a non-metal, a covalent bond is normally formed.

Accepted Answer

A) True 
 B)False

Question 5

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 6

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 7

The compound, NaH2PO4, is present in many baking powders. What is its name?

Accepted Answer

A) Sodium biphosphate 
B) Sodium hydrogen phosphate 
C) Sodium dihydrogen phosphate 
D) Sodium hydrophosphate 
E) Sodium dihydride phosphate 
A) Sodium biphosphate 
B) Sodium hydrogen phosphate 
C) Sodium dihydrogen phosphate 
D) Sodium hydrophosphate 
E) Sodium dihydride phosphate

Question 8

What is the chemical symbol for the group 6A (16) element that lies in period 4?

Accepted Answer

A) Cr 
B) Hf 
C) W 
D) Ti 
E) Se 
A) Cr 
B) Hf 
C) W 
D) Ti 
E) Se

Question 9

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

Accepted Answer

A) CaCl 2 
B) NaSO 4 
C) MgCO 3 
D) KF 
E) Cu(NO 3)2 
A) CaCl 2 
B) NaSO 4 
C) MgCO 3 
D) KF 
E) Cu(NO 3)2

Question 10

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

Accepted Answer

A) O 2− oxide 
B) Cd 2+ cadmium 
C) ClO 3 − chlorate 
D) HCO 3 − hydrogen carbonate 
E) NO 2 − nitrate 
A) O 2− oxide 
B) Cd 2+ cadmium 
C) ClO 3 − chlorate 
D) HCO 3 − hydrogen carbonate 
E) NO 2 − nitrate

Question 11

What are the approximate carbon:hydrogen mass ratios in methane (CH4) and ethyne (C2H2)?

Accepted Answer

A) 1:4 and 1:1 
B) 3:2 and 6:1 
C) 3:1 and 12:1 
D) 3:2 and 12:1 
E) 3:1 and 6:1 
A) 1:4 and 1:1 
B) 3:2 and 6:1 
C) 3:1 and 12:1 
D) 3:2 and 12:1 
E) 3:1 and 6:1

Question 12

Which of the following is a metal?

Accepted Answer

A) Nitrogen, N, Z = 7 
B) Phosphorus, P, Z = 15 
C) Arsenic, Z = 33 
D) Thallium, Tl, Z = 81 
E) Silicon, Si, Z = 14 
A) Nitrogen, N, Z = 7 
B) Phosphorus, P, Z = 15 
C) Arsenic, Z = 33 
D) Thallium, Tl, Z = 81 
E) Silicon, Si, Z = 14

Question 13

The formula of heptane is

Accepted Answer

A) C 6H 12. 
B) C 6H 14. 
C) C 7H 14. 
D) C 7H 16. 
E) C 8H 16. 
A) C 6H 12. 
B) C 6H 14. 
C) C 7H 14. 
D) C 7H 16. 
E) C 8H 16.

Question 14

For the element bromine, the symbol, group number, group name and physical state are, respectively

Accepted Answer

A) Bo, 17, noble gas, gas. 
B) B, 13, semimetal, solid. 
C) Br, 17, halogen, liquid. 
D) Br, 17, halogen, gas. 
E) Br, 15, chalcogenide, gas. 
A) Bo, 17, noble gas, gas. 
B) B, 13, semimetal, solid. 
C) Br, 17, halogen, liquid. 
D) Br, 17, halogen, gas. 
E) Br, 15, chalcogenide, gas.

Question 15

Which one of the following groups does not contain any metals?

Accepted Answer

A) C, S, As, H 
B) Cu, P, Se, Kr 
C) N, Ne, Nd, Np 
D) Xe, Hg, Ge, O 
E) Cl, Al, Si, Ar 
A) C, S, As, H 
B) Cu, P, Se, Kr 
C) N, Ne, Nd, Np 
D) Xe, Hg, Ge, O 
E) Cl, Al, Si, Ar

Question 16

Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula?

Accepted Answer

A) I 2O 5 
B) IO 5 
C) 2IO 5 
D) I 5O 2 
E) (IO 5)2 
A) I 2O 5 
B) IO 5 
C) 2IO 5 
D) I 5O 2 
E) (IO 5)2

Question 17

All neutral atoms of tin have 50 protons and 50 electrons.

Accepted Answer

A) True 
 B)False

Question 18

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 19

Tetrasulfur dinitride decomposes explosively when heated. What is its formula?

Accepted Answer

A) S 2N 4 
B) S 4N 2 
C) 4SN 2 
D) S 4N 
E) S 2N 
A) S 2N 4 
B) S 4N 2 
C) 4SN 2 
D) S 4N 
E) S 2N

Question 20

Sodium peroxide is an oxidizer used to bleach animal and vegetable fibers. What is its formula?

Accepted Answer

A) NaO 
B) NaO 2 
C) Na 2O 2 
D) Na 2O 
E) NaH 2O 2 
A) NaO 
B) NaO 2 
C) Na 2O 2 
D) Na 2O 
E) NaH 2O 2

Exam 2: The Components of Matter

The mass of a neutron is equal to the mass of a proton plus the mass of an electron.

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 the acid formed when HBr gas is dissolved in water?

When an alkali metal combines with a non-metal, a covalent bond is normally formed.

A column of the periodic table is called a

The compound, NaH2PO4, is present in many baking powders. What is its name?

What is the chemical symbol for the group 6A (16) element that lies in period 4?

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

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

What are the approximate carbon:hydrogen mass ratios in methane (CH4) and ethyne (C2H2)?

Which of the following is a metal?

The formula of heptane is

For the element bromine, the symbol, group number, group name and physical state are, respectively

Which one of the following groups does not contain any metals?

Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula?

All neutral atoms of tin have 50 protons and 50 electrons.

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

Tetrasulfur dinitride decomposes explosively when heated. What is its formula?

Sodium peroxide is an oxidizer used to bleach animal and vegetable fibers. What is its formula?

Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

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 Reaction Direction

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

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.

The compound, NaH₂PO₄, is present in many baking powders. What is its name?

What are the approximate carbon:hydrogen mass ratios in methane (CH₄) and ethyne (C₂H₂)?

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