Question 1

Over 20 billion kg of pure oxygen are produced industrially in the United States each year. The source of this oxygen is ________.

Accepted Answer

The answer of Over 20 billion kg of pure oxygen...

Question 2

The black tarnish on silver is

Accepted Answer

A)  AgOH. 
B)  Ag2O. 
C)  AgCl. 
D)  Ag2S. 
A)  AgOH. 
B)  Ag2O. 
C)  AgCl. 
D)  Ag2S.

Question 3

In the photosynthesis reaction: 6 CO2 + 6 H2O → C6H12O6 + 6 O2, carbon dioxide is

Accepted Answer

A)  oxidized. 
B)  reduced. 
C)  oxidized and reduced. 
D)  neither oxidized nor reduced. 
A)  oxidized. 
B)  reduced. 
C)  oxidized and reduced. 
D)  neither oxidized nor reduced.

Question 4

Approximately what percentage of the earth's crust is composed of oxygen?

Accepted Answer

A)  ≈ 5% 
B)  ≈ 40% 
C)  ≈ 50% 
D)  ≈ 75% 
A)  ≈ 5% 
B)  ≈ 40% 
C)  ≈ 50% 
D)  ≈ 75%

Question 5

The destructive power generated by an explosive mixture results from the rapid expansion of gaseous products.

Accepted Answer

A) True 
 B)False

Question 6

Which substance is a common oxidizing agent?

Accepted Answer

A)  C 
B)  Na2Cr2O7 
C)  N2 
D)  K 
A)  C 
B)  Na2Cr2O7 
C)  N2 
D)  K

Question 7

A substance that is reduced as a lead-acid storage battery generates an electric current is

Accepted Answer

A)  Pb. 
B)  PbSO4. 
C)  PbO2. 
D)  H2SO4. 
A)  Pb. 
B)  PbSO4. 
C)  PbO2. 
D)  H2SO4.

Question 8

Which of the following is NOT a common reducing agent?

Accepted Answer

A)  hydrogen peroxide 
B)  hydrogen 
C)  an antioxidant 
D)  coal/coke 
A)  hydrogen peroxide 
B)  hydrogen 
C)  an antioxidant 
D)  coal/coke

Question 9

What is the oxidation number of bismuth in Bi2O3?

Accepted Answer

A)  +1 
B)  +2 
C)  +3 
D)  +6 
A)  +1 
B)  +2 
C)  +3 
D)  +6

Question 10

In the reaction Cu+ + Fe → Cu + Fe2+ (Note: The reaction is not balanced.)

Accepted Answer

A)  Fe is the reducing agent. 
B)  Cu is the reducing agent. 
C)  Cu+ is the reducing agent. 
D)  Fe2+ is the reducing agent. 
A)  Fe is the reducing agent. 
B)  Cu is the reducing agent. 
C)  Cu+ is the reducing agent. 
D)  Fe2+ is the reducing agent.

Question 11

All redox reactions occur with the transfer of

Accepted Answer

A)  protons. 
B)  electrons. 
C)  chlorine. 
D)  nitrogen. 
A)  protons. 
B)  electrons. 
C)  chlorine. 
D)  nitrogen.

Question 12

When silver tarnishes,

Accepted Answer

A)  Ag atoms are oxidized to form Ag+ ions. 
B)  Ag atoms are reduced to form Ag+ ions. 
C)  Ag+ ions are oxidized to form Ag atoms. 
D)  Ag+ ions are reduced to form Ag atoms. 
A)  Ag atoms are oxidized to form Ag+ ions. 
B)  Ag atoms are reduced to form Ag+ ions. 
C)  Ag+ ions are oxidized to form Ag atoms. 
D)  Ag+ ions are reduced to form Ag atoms.

Question 13

Antiseptics are substances that

Accepted Answer

A)  are pain killers. 
B)  kill microorganisms. 
C)  relieve inflammation. 
D)  are the same as anesthetics. 
A)  are pain killers. 
B)  kill microorganisms. 
C)  relieve inflammation. 
D)  are the same as anesthetics.

Question 14

This compound is a powerful oxidizing agent and a harmful pollutant; yet a layer of it in the upper stratosphere serves as a shield from harmful ultraviolet radiation from the sun.

Accepted Answer

A)  CO2 
B)  O2 
C)  SO3 
D)  O3 (ozone) 
A)  CO2 
B)  O2 
C)  SO3 
D)  O3 (ozone)

Question 15

Which of the following is NOT a common oxidizing agent?

Accepted Answer

A)  iodine 
B)  chlorine 
C)  ozone 
D)  an antioxidant 
A)  iodine 
B)  chlorine 
C)  ozone 
D)  an antioxidant

Question 16

The HPPO process utilizes hydrogen peroxide and propylene oxide. One aspect of the HPPO process that is NOT true is

Accepted Answer

A)  the reaction is run in aqueous methanol. 
B)  Ti is rare and toxic. 
C)  the methanol used can be recycled. 
D)  it uses a titanium silicate catalyst. 
A)  the reaction is run in aqueous methanol. 
B)  Ti is rare and toxic. 
C)  the methanol used can be recycled. 
D)  it uses a titanium silicate catalyst.

Question 17

In a black-and-white photograph, the black area on the photographic negative represents

Accepted Answer

A)  the region where light fell and silver metal has been deposited during development. 
B)  the region where light fell and silver metal has been removed during development. 
C)  a region where light did not fall and silver metal has been deposited during development. 
D)  a region where light did not fall and silver metal has been removed during development. 
A)  the region where light fell and silver metal has been deposited during development. 
B)  the region where light fell and silver metal has been removed during development. 
C)  a region where light did not fall and silver metal has been deposited during development. 
D)  a region where light did not fall and silver metal has been removed during development.

Question 18

When C3H8 is burned in oxygen, the products are

Accepted Answer

A)  C + H2. 
B)  CH2 + H2O. 
C)  CO2 + H2. 
D)  CO2 + H2O. 
A)  C + H2. 
B)  CH2 + H2O. 
C)  CO2 + H2. 
D)  CO2 + H2O.

Question 19

The corrosion of metals, such as the rusting of iron, is an example of

Accepted Answer

A)  reduction. 
B)  oxidation. 
C)  proton transfer. 
D)  transmutation. 
A)  reduction. 
B)  oxidation. 
C)  proton transfer. 
D)  transmutation.

Question 20

The removal of silver tarnish from silverware using aluminum foil and a solution of electrolyte is an example of

Accepted Answer

A)  oxidation of aluminum metal. 
B)  reduction of silver ions. 
C)  an electrochemical cell. 
D)  all of the above 
A)  oxidation of aluminum metal. 
B)  reduction of silver ions. 
C)  an electrochemical cell. 
D)  all of the above

Exam 8: Oxidation and Reduction

Over 20 billion kg of pure oxygen are produced industrially in the United States each year. The source of this oxygen is ________.

The black tarnish on silver is

In the photosynthesis reaction: 6 CO2 + 6 H2O → C6H12O6 + 6 O2, carbon dioxide is

Approximately what percentage of the earth's crust is composed of oxygen?

The destructive power generated by an explosive mixture results from the rapid expansion of gaseous products.

Which substance is a common oxidizing agent?

A substance that is reduced as a lead-acid storage battery generates an electric current is

Which of the following is NOT a common reducing agent?

What is the oxidation number of bismuth in Bi2O3?

In the reaction Cu+ + Fe → Cu + Fe2+ (Note: The reaction is not balanced.)

All redox reactions occur with the transfer of

When silver tarnishes,

Antiseptics are substances that

This compound is a powerful oxidizing agent and a harmful pollutant; yet a layer of it in the upper stratosphere serves as a shield from harmful ultraviolet radiation from the sun.

Which of the following is NOT a common oxidizing agent?

The HPPO process utilizes hydrogen peroxide and propylene oxide. One aspect of the HPPO process that is NOT true is

In a black-and-white photograph, the black area on the photographic negative represents

When C3H8 is burned in oxygen, the products are

The corrosion of metals, such as the rusting of iron, is an example of

The removal of silver tarnish from silverware using aluminum foil and a solution of electrolyte is an example of

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In the photosynthesis reaction: 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂, carbon dioxide is

What is the oxidation number of bismuth in Bi₂O₃?

In the reaction Cu⁺ + Fe → Cu + Fe²⁺ (Note: The reaction is not balanced.)

When C₃H₈ is burned in oxygen, the products are