Question 1

Consider the reaction: Cu(s) + 4HNO3(aq) $\rightarrow$  Cu(NO3)2(aq) + 2NO2(g) + 2OH-(aq) Which species is oxidized?

Accepted Answer

A) OH-  
B) NO2 
C) Cu(NO3)2  
D) HNO3  
E) Cu 
A) OH-  
B) NO2 
C) Cu(NO3)2  
D) HNO3  
E) Cu

Question 2

The potential of a voltaic cell is greatest in cells constructed of strong oxidizing and reducing agents.

Accepted Answer

A) True 
 B)False

Question 3

In which of the following choices is the oxidation number incorrect?

Accepted Answer

A) Fe2+(aq); oxidation number = 2+ 
B) Cl-(aq); oxidation number = 1- 
C) H2(s); oxidation number = 1+ 
D) Cu2+(aq); oxidation number = 2+ 
E) C(s); oxidation number = 0 
A) Fe2+(aq); oxidation number = 2+ 
B) Cl-(aq); oxidation number = 1- 
C) H2(s); oxidation number = 1+ 
D) Cu2+(aq); oxidation number = 2+ 
E) C(s); oxidation number = 0

Question 4

Consider the following reaction: Mn(s) + CuSO4(aq) $\rightarrow$ MnSO4(aq) + Cu(s) Which of the following statements regarding this reaction is correct?

Accepted Answer

A) Manganese is neither oxidized nor reduced. 
B) The sulfate ion is oxidized. 
C) Copper is the reducing agent. 
D) Manganese is the oxidizing agent. 
E) Each copper gains two electrons. 
A) Manganese is neither oxidized nor reduced. 
B) The sulfate ion is oxidized. 
C) Copper is the reducing agent. 
D) Manganese is the oxidizing agent. 
E) Each copper gains two electrons.

Question 5

Consider the reaction: CH4(g) + 2O2(g) $\rightarrow$  CO2(g) + 2H2O(g) Which of the following statements is correct?

Accepted Answer

A) Carbon is oxidized. 
B) Oxygen is the reducing agent. 
C) Oxygen is oxidized. 
D) Carbon is the oxidizing agent. 
E) The reaction is not an oxidation-reduction reaction. 
A) Carbon is oxidized. 
B) Oxygen is the reducing agent. 
C) Oxygen is oxidized. 
D) Carbon is the oxidizing agent. 
E) The reaction is not an oxidation-reduction reaction.

Question 6

Which one of the following reactions is an example of an oxidation-reduction reaction?

Accepted Answer

A) BaO(s) + CO2(g) $\rightarrow$ BaCO3(s) 
B) H2(g) + F2(g) $\rightarrow$  2HF(g) 
C) CaCO3(s) $\rightarrow$  CaO(s) + CO2(g) 
D) HCl(aq) + NaOH(aq) $\rightarrow$  NaCl(aq) + H2O(l) 
E) Ba2+(aq) + SO42-(aq) $\rightarrow$  BaSO4(s) 
A) BaO(s) + CO2(g) $\rightarrow$ BaCO3(s) 
B) H2(g) + F2(g) $\rightarrow$  2HF(g) 
C) CaCO3(s) $\rightarrow$  CaO(s) + CO2(g) 
D) HCl(aq) + NaOH(aq) $\rightarrow$  NaCl(aq) + H2O(l) 
E) Ba2+(aq) + SO42-(aq) $\rightarrow$  BaSO4(s)

Question 7

Consider the reaction: Ba(NO3)2(aq) + Na2SO4(aq) $\rightarrow$ BaSO4(s) + 2NaNO3(aq) Which of the following statements is correct?

Accepted Answer

A) Barium is oxidized. 
B) Sodium is reduced. 
C) Nitrate ion is the reducing agent. 
D) Sulfate ion is the oxidizing agent. 
E) This reaction is not an oxidation-reduction reaction. 
A) Barium is oxidized. 
B) Sodium is reduced. 
C) Nitrate ion is the reducing agent. 
D) Sulfate ion is the oxidizing agent. 
E) This reaction is not an oxidation-reduction reaction.

Question 8

Consider the reaction: H2O(l) + 3SO32-(aq) + 2MnO4-(aq) $\rightarrow$ 3SO42-(aq) + 2MnO2(s) + 2OH-(aq) Which species is the reducing agent?

Accepted Answer

A) H2O 
B) SO32-   
C) MnO4-  
D) SO42-  
E) MnO2  
A) H2O 
B) SO32-   
C) MnO4-  
D) SO42-  
E) MnO2

Question 9

When a strip of zinc metal is placed in a blue aqueous solution of copper(II) sulfate, the surface of the zinc becomes coated with a reddish solid, and the zinc begins to dissolve to form aqueous zinc sulfate.Which of the following statements regarding this reaction is correct?

Accepted Answer

A) The copper(II) is being oxidized. 
B) The zinc is being reduced. 
C) The sulfate ion is being reduced. 
D) The solution will lose its blue color as the reaction progresses. 
E) The reaction described is nonspontaneous. 
A) The copper(II) is being oxidized. 
B) The zinc is being reduced. 
C) The sulfate ion is being reduced. 
D) The solution will lose its blue color as the reaction progresses. 
E) The reaction described is nonspontaneous.

Question 10

In a voltaic cell, the electron flow is always from

Accepted Answer

A) the salt bridge to the cathode. 
B) the salt bridge to the anode. 
C) the oxidizing agent through the salt bridge to the reducing agent. 
D) the reducing agent through the salt bridge to the oxidizing agent. 
E) the anode to the cathode. 
A) the salt bridge to the cathode. 
B) the salt bridge to the anode. 
C) the oxidizing agent through the salt bridge to the reducing agent. 
D) the reducing agent through the salt bridge to the oxidizing agent. 
E) the anode to the cathode.

Question 11

The figure shows the electrolysis of molten AlCl3.What reaction occurs at the anode of this cell?

Accepted Answer

A) AlCl3(l) $\rightarrow$AlCl2(l) 
B) Cl-(l) + e- $\rightarrow$Cl2-  
C) Al3+(l) + 3e- $\rightarrow$Al(l) 
D) 2Cl-(l) + 2e- $\rightarrow$Cl2(g) 
E) 2Cl-(l) $\rightarrow$ Cl2(g) + 2e-  
A) AlCl3(l) $\rightarrow$AlCl2(l) 
B) Cl-(l) + e- $\rightarrow$Cl2-  
C) Al3+(l) + 3e- $\rightarrow$Al(l) 
D) 2Cl-(l) + 2e- $\rightarrow$Cl2(g) 
E) 2Cl-(l) $\rightarrow$ Cl2(g) + 2e-

Question 12

The reaction that occurs in an alkaline battery is as follows: Zn(s) + MnO2(s) + H2O(l) $\rightarrow$ ZnO(s) + Mn(OH)2(s) The substance that is reduced in this battery is:

Accepted Answer

A) Zn 
B) ZnO 
C) MnO2  
D) H2O 
E) Mn(OH)2  
A) Zn 
B) ZnO 
C) MnO2  
D) H2O 
E) Mn(OH)2

Question 13

The salt bridge in an electrochemical cell provides cations to the half-cell in which oxidation occurs.

Accepted Answer

A) True 
 B)False

Question 14

A lead-acid battery that is used in cars and trucks is powered by the reaction: PbO2(s) + Pb(s) + 2H2SO4(aq)$\rightarrow$2PbSO4(s) + H2O(l) The substance that is reduced in this battery is:

Accepted Answer

A) PbSO4  
B) H2O 
C) PbO2  
D) Pb 
E) H2SO4  
A) PbSO4  
B) H2O 
C) PbO2  
D) Pb 
E) H2SO4

Question 15

A mercury button battery that is used in watches and calculators is powered by the following reaction: Zn(s) + HgO(s) $\rightarrow$ZnO(s) + Hg(s) The substance that is oxidized in this battery is:

Accepted Answer

A) HgO 
B) Hg 
C) ZnO 
D) Zn 
A) HgO 
B) Hg 
C) ZnO 
D) Zn

Question 16

Consider the reaction: Sn2+(aq) + 2Fe3+(aq) $\rightarrow$Sn4+(aq) + 2Fe2+(aq) Which species is the oxidizing agent, and how many electrons are transferred per Sn2+ ion that reacts?

Accepted Answer

A) Sn2+, 2 electrons 
B) Fe3+, 2 electrons 
C) Sn4+, 4 electrons 
D) Fe2+, 4 electrons 
E) Fe2+, 2 electrons 
A) Sn2+, 2 electrons 
B) Fe3+, 2 electrons 
C) Sn4+, 4 electrons 
D) Fe2+, 4 electrons 
E) Fe2+, 2 electrons

Question 17

The figure shows the electrolysis of molten AlCl3.What reaction occurs at the cathode of this cell?

Accepted Answer

A) AlCl3(l) $\rightarrow$AlCl2(l) 
B) Cl-(l) + e- $\rightarrow$Cl2-  
C) Al3+(l) + 3e- $\rightarrow$Al(l) 
D) 2Cl-(l) + 2e- $\rightarrow$Cl2(g) 
E) 2Cl-(l) $\rightarrow$ Cl2(g) + 2e-  
A) AlCl3(l) $\rightarrow$AlCl2(l) 
B) Cl-(l) + e- $\rightarrow$Cl2-  
C) Al3+(l) + 3e- $\rightarrow$Al(l) 
D) 2Cl-(l) + 2e- $\rightarrow$Cl2(g) 
E) 2Cl-(l) $\rightarrow$ Cl2(g) + 2e-

Question 18

Consider the reaction: CrO42-(aq) + HSO3-(aq) $\rightarrow$Cr3+(aq) + SO42-(aq) When this equation is balanced in acidic solution, the coefficient for water will be__________, and the number of electrons transferred will be __________.

Accepted Answer

A) 3, 3 
B) 2, 1 
C) 2, 4 
D) 5, 6 
E) 2, 3 
A) 3, 3 
B) 2, 1 
C) 2, 4 
D) 5, 6 
E) 2, 3

Question 19

The following reaction occurs in acid solution.When the equation is properly balanced with the smallest whole-number coefficients, what is the coefficient of Bi3+? Mn2+(aq) + BiO3-(aq) $\rightarrow$MnO4-(aq) + Bi3+(aq)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 20

Consider the following reaction: 2Fe3+(aq) + 2Hg(l) + 2Cl-(aq) $\rightarrow$  2Fe2+(aq) + Hg2Cl2(s) In this reaction,

Accepted Answer

A) Fe3+(aq) is the reducing agent. 
B) Fe3+(aq) loses electrons. 
C) Hg(l) loses electrons. 
D) Hg(l) is reduced. 
E) Hg(l) is the oxidizing agent. 
A) Fe3+(aq) is the reducing agent. 
B) Fe3+(aq) loses electrons. 
C) Hg(l) loses electrons. 
D) Hg(l) is reduced. 
E) Hg(l) is the oxidizing agent.

Consider the reaction: Cu(s) + 4HNO₃(aq) $\rightarrow$ Cu(NO₃)₂(aq) + 2NO₂(g) + 2OH^-(aq) Which species is oxidized?

The potential of a voltaic cell is greatest in cells constructed of strong oxidizing and reducing agents.

In which of the following choices is the oxidation number incorrect?

Consider the following reaction: Mn(s) + CuSO₄(aq) $\rightarrow$ MnSO₄(aq) + Cu(s) Which of the following statements regarding this reaction is correct?

Consider the reaction: CH₄(g) + 2O₂(g) $\rightarrow$ CO₂(g) + 2H₂O(g) Which of the following statements is correct?

Which one of the following reactions is an example of an oxidation-reduction reaction?

Consider the reaction: Ba(NO₃)₂(aq) + Na₂SO₄(aq) $\rightarrow$ BaSO₄(s) + 2NaNO₃(aq) Which of the following statements is correct?

Consider the reaction: H₂O(l) + 3SO₃²^-(aq) + 2MnO₄^-(aq) $\rightarrow$ 3SO₄²^-(aq) + 2MnO₂(s) + 2OH^-(aq) Which species is the reducing agent?

When a strip of zinc metal is placed in a blue aqueous solution of copper(II) sulfate, the surface of the zinc becomes coated with a reddish solid, and the zinc begins to dissolve to form aqueous zinc sulfate.Which of the following statements regarding this reaction is correct?

In a voltaic cell, the electron flow is always from

The figure shows the electrolysis of molten AlCl₃.What reaction occurs at the anode of this cell?

The reaction that occurs in an alkaline battery is as follows: Zn(s) + MnO₂(s) + H₂O(l) $\rightarrow$ ZnO(s) + Mn(OH)₂(s) The substance that is reduced in this battery is:

The salt bridge in an electrochemical cell provides cations to the half-cell in which oxidation occurs.

A lead-acid battery that is used in cars and trucks is powered by the reaction: PbO₂(s) + Pb(s) + 2H₂SO₄(aq) $\rightarrow$ 2PbSO₄(s) + H₂O(l) The substance that is reduced in this battery is:

A mercury button battery that is used in watches and calculators is powered by the following reaction: Zn(s) + HgO(s) $\rightarrow$ ZnO(s) + Hg(s) The substance that is oxidized in this battery is:

Consider the reaction: Sn²⁺(aq) + 2Fe³⁺(aq) $\rightarrow$ Sn⁴⁺(aq) + 2Fe²⁺(aq) Which species is the oxidizing agent, and how many electrons are transferred per Sn²⁺ion that reacts?

The figure shows the electrolysis of molten AlCl₃.What reaction occurs at the cathode of this cell?

Consider the reaction: CrO₄²^-(aq) + HSO₃-(aq) $\rightarrow$ Cr³⁺(aq) + SO₄²^-(aq) When this equation is balanced in acidic solution, the coefficient for water will be, and the number of electrons transferred will be .

The following reaction occurs in acid solution.When the equation is properly balanced with the smallest whole-number coefficients, what is the coefficient of Bi³⁺? Mn²⁺(aq) + BiO₃^-(aq) $\rightarrow$ MnO₄^-(aq) + Bi³⁺(aq)

Consider the following reaction: 2Fe³⁺(aq) + 2Hg(l) + 2Cl^-(aq) $\rightarrow$ 2Fe²⁺(aq) + Hg₂Cl₂(s) In this reaction,

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Quantities in Chemical Reactions

Electron Structure of the Atom

Chemical Bonding

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

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Exam 14: Oxidation-Reduction Reactions

Consider the reaction: Cu(s) + 4HNO3(aq) →\rightarrow→ Cu(NO3)2(aq) + 2NO2(g) + 2OH-(aq) Which species is oxidized?

The potential of a voltaic cell is greatest in cells constructed of strong oxidizing and reducing agents.

In which of the following choices is the oxidation number incorrect?

Consider the following reaction: Mn(s) + CuSO4(aq) →\rightarrow→ MnSO4(aq) + Cu(s) Which of the following statements regarding this reaction is correct?

Consider the reaction: CH4(g) + 2O2(g) →\rightarrow→ CO2(g) + 2H2O(g) Which of the following statements is correct?

Which one of the following reactions is an example of an oxidation-reduction reaction?

Consider the reaction: Ba(NO3)2(aq) + Na2SO4(aq) →\rightarrow→ BaSO4(s) + 2NaNO3(aq) Which of the following statements is correct?

Consider the reaction: H2O(l) + 3SO32-(aq) + 2MnO4-(aq) →\rightarrow→ 3SO42-(aq) + 2MnO2(s) + 2OH-(aq) Which species is the reducing agent?

When a strip of zinc metal is placed in a blue aqueous solution of copper(II) sulfate, the surface of the zinc becomes coated with a reddish solid, and the zinc begins to dissolve to form aqueous zinc sulfate.Which of the following statements regarding this reaction is correct?

In a voltaic cell, the electron flow is always from

The figure shows the electrolysis of molten AlCl3.What reaction occurs at the anode of this cell?

The reaction that occurs in an alkaline battery is as follows: Zn(s) + MnO2(s) + H2O(l) →\rightarrow→ ZnO(s) + Mn(OH)2(s) The substance that is reduced in this battery is:

The salt bridge in an electrochemical cell provides cations to the half-cell in which oxidation occurs.

A lead-acid battery that is used in cars and trucks is powered by the reaction: PbO2(s) + Pb(s) + 2H2SO4(aq) →\rightarrow→ 2PbSO4(s) + H2O(l) The substance that is reduced in this battery is:

A mercury button battery that is used in watches and calculators is powered by the following reaction: Zn(s) + HgO(s) →\rightarrow→ ZnO(s) + Hg(s) The substance that is oxidized in this battery is:

Consider the reaction: Sn2+(aq) + 2Fe3+(aq) →\rightarrow→ Sn4+(aq) + 2Fe2+(aq) Which species is the oxidizing agent, and how many electrons are transferred per Sn2+ ion that reacts?

The figure shows the electrolysis of molten AlCl3.What reaction occurs at the cathode of this cell?

Consider the reaction: CrO42-(aq) + HSO3-(aq) →\rightarrow→ Cr3+(aq) + SO42-(aq) When this equation is balanced in acidic solution, the coefficient for water will be__________, and the number of electrons transferred will be __________.

The following reaction occurs in acid solution.When the equation is properly balanced with the smallest whole-number coefficients, what is the coefficient of Bi3+? Mn2+(aq) + BiO3-(aq) →\rightarrow→ MnO4-(aq) + Bi3+(aq)

Consider the following reaction: 2Fe3+(aq) + 2Hg(l) + 2Cl-(aq) →\rightarrow→ 2Fe2+(aq) + Hg2Cl2(s) In this reaction,

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Quantities in Chemical Reactions

Electron Structure of the Atom

Chemical Bonding

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Biochemistry

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Consider the reaction: Cu(s) + 4HNO₃(aq) $\rightarrow$ Cu(NO₃)₂(aq) + 2NO₂(g) + 2OH^-(aq) Which species is oxidized?

Consider the following reaction: Mn(s) + CuSO₄(aq) $\rightarrow$ MnSO₄(aq) + Cu(s) Which of the following statements regarding this reaction is correct?

Consider the reaction: CH₄(g) + 2O₂(g) $\rightarrow$ CO₂(g) + 2H₂O(g) Which of the following statements is correct?

Consider the reaction: Ba(NO₃)₂(aq) + Na₂SO₄(aq) $\rightarrow$ BaSO₄(s) + 2NaNO₃(aq) Which of the following statements is correct?

Consider the reaction: H₂O(l) + 3SO₃²^-(aq) + 2MnO₄^-(aq) $\rightarrow$ 3SO₄²^-(aq) + 2MnO₂(s) + 2OH^-(aq) Which species is the reducing agent?

The figure shows the electrolysis of molten AlCl₃.What reaction occurs at the anode of this cell?

The reaction that occurs in an alkaline battery is as follows: Zn(s) + MnO₂(s) + H₂O(l) $\rightarrow$ ZnO(s) + Mn(OH)₂(s) The substance that is reduced in this battery is:

A lead-acid battery that is used in cars and trucks is powered by the reaction: PbO₂(s) + Pb(s) + 2H₂SO₄(aq) $\rightarrow$ 2PbSO₄(s) + H₂O(l) The substance that is reduced in this battery is:

A mercury button battery that is used in watches and calculators is powered by the following reaction: Zn(s) + HgO(s) $\rightarrow$ ZnO(s) + Hg(s) The substance that is oxidized in this battery is:

Consider the reaction: Sn²⁺(aq) + 2Fe³⁺(aq) $\rightarrow$ Sn⁴⁺(aq) + 2Fe²⁺(aq) Which species is the oxidizing agent, and how many electrons are transferred per Sn²⁺ion that reacts?

The figure shows the electrolysis of molten AlCl₃.What reaction occurs at the cathode of this cell?

Consider the reaction: CrO₄²^-(aq) + HSO₃-(aq) $\rightarrow$ Cr³⁺(aq) + SO₄²^-(aq) When this equation is balanced in acidic solution, the coefficient for water will be, and the number of electrons transferred will be .

The following reaction occurs in acid solution.When the equation is properly balanced with the smallest whole-number coefficients, what is the coefficient of Bi³⁺? Mn²⁺(aq) + BiO₃^-(aq) $\rightarrow$ MnO₄^-(aq) + Bi³⁺(aq)

Consider the following reaction: 2Fe³⁺(aq) + 2Hg(l) + 2Cl^-(aq) $\rightarrow$ 2Fe²⁺(aq) + Hg₂Cl₂(s) In this reaction,