Question 1

Which of the following is a definition of reduction?

Accepted Answer

A)  Reduction is the gain of oxygen. 
B)  Reduction is the gain of hydrogen. 
C)  Reduction is the loss of hydrogen. 
D)  Reduction is the gain of BOTH electrons AND oxygen. 
A)  Reduction is the gain of oxygen. 
B)  Reduction is the gain of hydrogen. 
C)  Reduction is the loss of hydrogen. 
D)  Reduction is the gain of BOTH electrons AND oxygen.

Question 2

Which of the following statements about the rusting of iron is true?

Accepted Answer

A)  Iron is reduced in the presence of oxygen. 
B)  Iron is oxidized in the presence of oxygen. 
C)  The iron(III) hydroxide forms a hard coating that protects the iron from undergoing further corrosion. 
D)  Iron will rust more quickly in the absence of water. 
A)  Iron is reduced in the presence of oxygen. 
B)  Iron is oxidized in the presence of oxygen. 
C)  The iron(III) hydroxide forms a hard coating that protects the iron from undergoing further corrosion. 
D)  Iron will rust more quickly in the absence of water.

Question 3

Silver is plated on copper by immersing a piece of copper into a solution containing silver ions. In the plating reaction, silver ions

Accepted Answer

A)  are oxidized and are the oxidizing agent. 
B)  are oxidized and are the reducing agent. 
C)  are reduced and are the oxidizing agent. 
D)  are reduced and are the reducing agent. 
A)  are oxidized and are the oxidizing agent. 
B)  are oxidized and are the reducing agent. 
C)  are reduced and are the oxidizing agent. 
D)  are reduced and are the reducing agent.

Question 4

Silver is plated on copper by immersing a piece of copper into a solution containing silver ions. In the plating reaction, silver ions

Accepted Answer

A)  lose one electron and are oxidized. 
B)  lose one electron and are reduced. 
C)  gain one electron and are oxidized. 
D)  gain one electron and are reduced. 
A)  lose one electron and are oxidized. 
B)  lose one electron and are reduced. 
C)  gain one electron and are oxidized. 
D)  gain one electron and are reduced.

Question 5

In which of the following is the reactant undergoing reduction? (Note: These reactions are not complete chemical equations.)

Accepted Answer

A)  C2H4O → C2H4O2 
B)  C2H4O → C2H6O 
C)  CO → CO2 
D)  CH4 → C 
A)  C2H4O → C2H4O2 
B)  C2H4O → C2H6O 
C)  CO → CO2 
D)  CH4 → C

Question 6

A battery in which a fuel is oxidized at the anode and oxygen is reduced at the cathode is a(n)

Accepted Answer

A)  alkaline battery. 
B)  fuel cell. 
C)  lead storage battery. 
D)  lithium battery. 
A)  alkaline battery. 
B)  fuel cell. 
C)  lead storage battery. 
D)  lithium battery.

Question 7

A common use of lead storage batteries is automobiles.

Accepted Answer

A) True 
 B)False

Question 8

In which of the following partial reactions is the reactant undergoing reduction? (Note: The reactions are not complete.)

Accepted Answer

A)  PbO → Pb 
B)  KClO2 → KClO3 
C)  SnO → SnO2 
D)  Cu2O → CuO 
A)  PbO → Pb 
B)  KClO2 → KClO3 
C)  SnO → SnO2 
D)  Cu2O → CuO

Question 9

Consider the following reaction: 2 Fe + 3 Mg2+ → 2 Fe3+ + 3 Mg The half-reaction for the oxidation in this reaction is

Accepted Answer

A)  Fe → Fe3+ + 3 e- 
B)  Fe3+ + 3 e- → Fe 
C)  Mg → Mg2+ + 2 e- 
D)  Mg2+ + 2 e-  → Mg 
A)  Fe → Fe3+ + 3 e- 
B)  Fe3+ + 3 e- → Fe 
C)  Mg → Mg2+ + 2 e- 
D)  Mg2+ + 2 e-  → Mg

Question 10

Which of the following is a reducing agent?

Accepted Answer

A)  an antioxidant 
B)  an antiseptic 
C)  a bleach 
D)  a disinfectant 
A)  an antioxidant 
B)  an antiseptic 
C)  a bleach 
D)  a disinfectant

Question 11

The air that we breathe is composed of approximately ________% oxygen by volume.

Accepted Answer

The answer of The air that we breathe is composed...

Question 12

Which substance is an oxidizing agent?

Accepted Answer

A)  NaOH 
B)  H2O2 
C)  HI 
D)  LiBr 
A)  NaOH 
B)  H2O2 
C)  HI 
D)  LiBr

Question 13

When metals react with oxygen, they form

Accepted Answer

A)  oxygen gas. 
B)  noble gases. 
C)  oxides. 
D)  nonmetals. 
A)  oxygen gas. 
B)  noble gases. 
C)  oxides. 
D)  nonmetals.

Question 14

Magnesium burns brightly in the presence of oxygen. When magnesium reacts with oxygen, the compound formed is

Accepted Answer

A)  MgO. 
B)  MgO3. 
C)  Mg3O. 
D)  Mg4O4. 
A)  MgO. 
B)  MgO3. 
C)  Mg3O. 
D)  Mg4O4.

Question 15

Zinc is oxidized in the following reaction:
Zn + 2 H+  → Zn2+ + H2

Accepted Answer

A) True 
 B)False

Question 16

The only natural process that produces oxygen is

Accepted Answer

A)  growth. 
B)  photosynthesis. 
C)  humidity. 
D)  electrochemical cells. 
A)  growth. 
B)  photosynthesis. 
C)  humidity. 
D)  electrochemical cells.

Question 17

What is reduced in the following reaction? 2 Bi3+ + 3 Mg → 2 Bi + 3 Mg2+

Accepted Answer

A)  Bi3+ 
B)  Mg 
C)  Bi 
D)  Mg2+ 
A)  Bi3+ 
B)  Mg 
C)  Bi 
D)  Mg2+

Question 18

Photosynthesis involves the

Accepted Answer

A)  reduction of carbohydrates. 
B)  reduction of water. 
C)  oxidation of water. 
D)  oxidation of carbohydrates. 
A)  reduction of carbohydrates. 
B)  reduction of water. 
C)  oxidation of water. 
D)  oxidation of carbohydrates.

Question 19

Consider the following reaction: 2 Fe + 3 Mg2+ → 2 Fe3+ + 3 Mg The half-reaction for the reduction in this reaction is

Accepted Answer

A)  Fe → Fe3+ + 3 e- 
B)  Fe3+ + 3 e- → Fe 
C)  Mg → Mg2+ + 2 e- 
D)  Mg2+ + 2 e- → Mg 
A)  Fe → Fe3+ + 3 e- 
B)  Fe3+ + 3 e- → Fe 
C)  Mg → Mg2+ + 2 e- 
D)  Mg2+ + 2 e- → Mg

Question 20

Which of the following statements is true for electrochemical cells?

Accepted Answer

A)  Oxidation occurs at the anode. 
B)  Oxidation occurs at the cathode. 
C)  Reduction occurs at the anode. 
D)  Both oxidation and reduction occur at the cathode. 
A)  Oxidation occurs at the anode. 
B)  Oxidation occurs at the cathode. 
C)  Reduction occurs at the anode. 
D)  Both oxidation and reduction occur at the cathode.

Exam 8: Oxidation and Reduction

Which of the following is a definition of reduction?

Which of the following statements about the rusting of iron is true?

Silver is plated on copper by immersing a piece of copper into a solution containing silver ions. In the plating reaction, silver ions

Silver is plated on copper by immersing a piece of copper into a solution containing silver ions. In the plating reaction, silver ions

In which of the following is the reactant undergoing reduction? (Note: These reactions are not complete chemical equations.)

A battery in which a fuel is oxidized at the anode and oxygen is reduced at the cathode is a(n)

A common use of lead storage batteries is automobiles.

In which of the following partial reactions is the reactant undergoing reduction? (Note: The reactions are not complete.)

Consider the following reaction: 2 Fe + 3 Mg2+ → 2 Fe3+ + 3 Mg The half-reaction for the oxidation in this reaction is

Which of the following is a reducing agent?

The air that we breathe is composed of approximately ________% oxygen by volume.

Which substance is an oxidizing agent?

When metals react with oxygen, they form

Magnesium burns brightly in the presence of oxygen. When magnesium reacts with oxygen, the compound formed is

Zinc is oxidized in the following reaction: Zn + 2 H+ → Zn2+ + H2

The only natural process that produces oxygen is

What is reduced in the following reaction? 2 Bi3+ + 3 Mg → 2 Bi + 3 Mg2+

Photosynthesis involves the

Consider the following reaction: 2 Fe + 3 Mg2+ → 2 Fe3+ + 3 Mg The half-reaction for the reduction in this reaction is

Which of the following statements is true for electrochemical cells?

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Consider the following reaction: 2 Fe + 3 Mg²⁺ → 2 Fe³⁺ + 3 Mg The half-reaction for the oxidation in this reaction is

Zinc is oxidized in the following reaction: Zn + 2 H⁺ → Zn²⁺ + H₂

What is reduced in the following reaction? 2 Bi³⁺ + 3 Mg → 2 Bi + 3 Mg²⁺

Consider the following reaction: 2 Fe + 3 Mg²⁺→ 2 Fe³⁺ + 3 Mg The half-reaction for the reduction in this reaction is