Question 1

Choose the INCORRECT statement.

Accepted Answer

A)  A structural formula shows which atoms are bonded together and by what type of bond. 
B)  Formula mass is the mass of a formula unit. 
C)  Molecular mass is the mass of a molecular compound. 
D)  The molecular mass of hydrogen is 1.008 u. 
E)  The molecular formula is the same as, or a multiple of, the empirical formula. 
A)  A structural formula shows which atoms are bonded together and by what type of bond. 
B)  Formula mass is the mass of a formula unit. 
C)  Molecular mass is the mass of a molecular compound. 
D)  The molecular mass of hydrogen is 1.008 u. 
E)  The molecular formula is the same as, or a multiple of, the empirical formula.

Question 2

A molecule is a group of bonded atoms that exist as an entity.

Accepted Answer

A) True 
 B)False

Question 3

For an ionic compound, the term formula mass is more appropriate than the term molecular mass.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following are isomers?

Accepted Answer

A)  CH3 CH(CH2CH3 )CH2CH2CH3  and CH3 CH(CH3 )CH2CH2CH3  
B)  CH3 CH(OH)CH2CH2CH3  and CH3 CH(CH3 )CH2CH2CH3  
C)  CH3 CH(OH)CH2CH2CH3  and CH3 CH(OH)CH2CH(CH3 )CH3  
D)  CH3 CH(OH)CH2CH2CH3  and CH3 CH(CH3 )CH2CH2OH 
E)  CH3 CH(CH3 )CH2CH(CH3 )CH3  and CH3 CH2CH2CH2CH3  
A)  CH3 CH(CH2CH3 )CH2CH2CH3  and CH3 CH(CH3 )CH2CH2CH3  
B)  CH3 CH(OH)CH2CH2CH3  and CH3 CH(CH3 )CH2CH2CH3  
C)  CH3 CH(OH)CH2CH2CH3  and CH3 CH(OH)CH2CH(CH3 )CH3  
D)  CH3 CH(OH)CH2CH2CH3  and CH3 CH(CH3 )CH2CH2OH 
E)  CH3 CH(CH3 )CH2CH(CH3 )CH3  and CH3 CH2CH2CH2CH3

Question 5

The correct chemical name for the compound KNO2 is ________.

Accepted Answer

A)  potassium nitrate 
B)  potassium nitrite 
C)  potassium nitrogen dioxide 
D)  potassium nitrous oxide 
E)  potassium hyponitrite 
A)  potassium nitrate 
B)  potassium nitrite 
C)  potassium nitrogen dioxide 
D)  potassium nitrous oxide 
E)  potassium hyponitrite

Question 6

Elemental analysis of 50.0000 g of a compound showed that it contained 12.7520 g C, 3.2105 g H, and the rest was S. The empirical formula of this compound is ________.

Accepted Answer

A)  CHS 
B)  CH2S 
C)  CH3S 
D)  C2H2S 
E)  C2H3S2 
A)  CHS 
B)  CH2S 
C)  CH3S 
D)  C2H2S 
E)  C2H3S2

Question 7

Only metals in binary compounds use prefixes such as di-, tri-, tetra-, etc.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following could be an empirical formula?

Accepted Answer

A)  C9H8O4 (aspirin) 
B)  C6H8O6 (vitamin
C)  
C)  C8H10N4O2 (caffeine) 
D)  C10H14N2 (nicotine) 
A)  C9H8O4 (aspirin) 
B)  C6H8O6 (vitamin
C)  
C)  C8H10N4O2 (caffeine) 
D)  C10H14N2 (nicotine)

Question 9

What is the correct name for the following organic structure? CH2=CHCH2CH(CH3)CH3

Accepted Answer

A)  hexene 
B)  hexane 
C)  1-hexene 
D)  4-methyl-2-pentene 
E)  4-methyl-1-pentene 
A)  hexene 
B)  hexane 
C)  1-hexene 
D)  4-methyl-2-pentene 
E)  4-methyl-1-pentene

Question 10

Naphthalene, commonly found in mothballs, is 93.75% carbon and 6.25% hydrogen by mass. If naphthalene's molecular formula is twice its empirical formula, what would its molar mass be?

Accepted Answer

A)  64 u 
B)  96 u 
C)  128 u 
D)  192 u 
E)  160 u 
A)  64 u 
B)  96 u 
C)  128 u 
D)  192 u 
E)  160 u

Question 11

How many hydrogen atoms are there in 12.4 g of Al2(HPO4)3?

Accepted Answer

A)  6.55 × 1022 H atoms 
B)  1.09 × 1022 H atoms 
C)  6.07 × 1022 H atoms 
D)  1.32 × 1023 H atoms 
E)  4.39 × 1022 H atoms 
A)  6.55 × 1022 H atoms 
B)  1.09 × 1022 H atoms 
C)  6.07 × 1022 H atoms 
D)  1.32 × 1023 H atoms 
E)  4.39 × 1022 H atoms

Question 12

Which of the following is the correct definition of an isomer?

Accepted Answer

A)  Isomers are molecules that have the same empirical formula but different arrangements of atoms in space. 
B)  Isomers are molecules that have the same molecular formula but different arrangements of atoms in space. 
C)  Isomers are molecules that have the same arrangements of atoms in space but different empirical and molecular formulas. 
D)  Isomers are molecules that have the same molecular formula but contain different isotopes. 
E)  Isomers are molecules with the same empirical formula but have different isotopes. 
A)  Isomers are molecules that have the same empirical formula but different arrangements of atoms in space. 
B)  Isomers are molecules that have the same molecular formula but different arrangements of atoms in space. 
C)  Isomers are molecules that have the same arrangements of atoms in space but different empirical and molecular formulas. 
D)  Isomers are molecules that have the same molecular formula but contain different isotopes. 
E)  Isomers are molecules with the same empirical formula but have different isotopes.

Question 13

The oxidation state of vanadium in VO+2 is ________.

Accepted Answer

A)  -2 
B)  +2 
C)  +1 
D)  -4 
E)  +4 
A)  -2 
B)  +2 
C)  +1 
D)  -4 
E)  +4

Question 14

Arrange the following in order of increasing oxidation state of chlorine: NaClO, NaClO3, NaClO2, and NaClO4.

Accepted Answer

A)  NaClO, NaClO2, NaClO3, NaClO4 
B)  NaClO4, NaClO3, NaClO2, NaClO 
C)  NaClO, NaClO3, NaClO2, NaClO4 
D)  NaClO4, NaClO, NaClO3, NaClO2 
E)  NaClO3, NaClO2, NaClO, NaClO4 
A)  NaClO, NaClO2, NaClO3, NaClO4 
B)  NaClO4, NaClO3, NaClO2, NaClO 
C)  NaClO, NaClO3, NaClO2, NaClO4 
D)  NaClO4, NaClO, NaClO3, NaClO2 
E)  NaClO3, NaClO2, NaClO, NaClO4

Question 15

2.404 g of a compound were burned in oxygen and found to produce only 3.520 g CO2(g), 2.564 g SO2(g) and 1.440 g H2O(l). Determine the empirical formula of the compound.

Accepted Answer

A)  CSH 
B)  C2SH4 
C)  C4SH2 
D)  C2S2H4 
E)  C2SH2 
A)  CSH 
B)  C2SH4 
C)  C4SH2 
D)  C2S2H4 
E)  C2SH2

Question 16

Choose the INCORRECT oxidation state.

Accepted Answer

A)  C is 0 in H2CO 
B)  S is +4 in H2SO3 
C)  C is +2 in HCOOH 
D)  Fe is +2 in Fe2O3 
E)  Mn is +7 in KMnO4 
A)  C is 0 in H2CO 
B)  S is +4 in H2SO3 
C)  C is +2 in HCOOH 
D)  Fe is +2 in Fe2O3 
E)  Mn is +7 in KMnO4

Question 17

The correct chemical name for the compound HIO is ________.

Accepted Answer

A)  periodic acid 
B)  hydrogen iodide oxide 
C)  hydrogen iodite 
D)  hypoiodous acid 
E)  hypoiodic acid 
A)  periodic acid 
B)  hydrogen iodide oxide 
C)  hydrogen iodite 
D)  hypoiodous acid 
E)  hypoiodic acid

Question 18

The oxidation state of oxygen in oxygen difluoride, OF2, is ________.

Accepted Answer

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

Question 19

Determine the mass percent H in NH4Cl.

Accepted Answer

A)  1.9% 
B)  14% 
C)  7.5% 
D)  3.6% 
E)  67% 
A)  1.9% 
B)  14% 
C)  7.5% 
D)  3.6% 
E)  67%

Question 20

Organic chemistry refers to compounds of oxygen, and hydrogen.

Accepted Answer

A) True 
 B)False

Exam 3: Chemical Compounds

Choose the INCORRECT statement.

A molecule is a group of bonded atoms that exist as an entity.

For an ionic compound, the term formula mass is more appropriate than the term molecular mass.

Which of the following are isomers?

The correct chemical name for the compound KNO2 is ________.

Elemental analysis of 50.0000 g of a compound showed that it contained 12.7520 g C, 3.2105 g H, and the rest was S. The empirical formula of this compound is ________.

Only metals in binary compounds use prefixes such as di-, tri-, tetra-, etc.

Which of the following could be an empirical formula?

What is the correct name for the following organic structure? CH2=CHCH2CH(CH3)CH3

Naphthalene, commonly found in mothballs, is 93.75% carbon and 6.25% hydrogen by mass. If naphthalene's molecular formula is twice its empirical formula, what would its molar mass be?

How many hydrogen atoms are there in 12.4 g of Al2(HPO4)3?

Which of the following is the correct definition of an isomer?

The oxidation state of vanadium in VO+2 is ________.

Arrange the following in order of increasing oxidation state of chlorine: NaClO, NaClO3, NaClO2, and NaClO4.

2.404 g of a compound were burned in oxygen and found to produce only 3.520 g CO2(g), 2.564 g SO2(g) and 1.440 g H2O(l). Determine the empirical formula of the compound.

Choose the INCORRECT oxidation state.

The correct chemical name for the compound HIO is ________.

The oxidation state of oxygen in oxygen difluoride, OF2, is ________.

Determine the mass percent H in NH4Cl.

Organic chemistry refers to compounds of oxygen, and hydrogen.

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

The correct chemical name for the compound KNO₂ is ________.

What is the correct name for the following organic structure? CH₂=CHCH₂CH(CH₃)CH₃

How many hydrogen atoms are there in 12.4 g of Al₂(HPO₄)₃?

Arrange the following in order of increasing oxidation state of chlorine: NaClO, NaClO₃, NaClO₂, and NaClO₄.

2.404 g of a compound were burned in oxygen and found to produce only 3.520 g CO₂(g), 2.564 g SO₂(g) and 1.440 g H₂O(l). Determine the empirical formula of the compound.

Determine the mass percent H in NH₄Cl.