Question 1

In any electrolytic cell, the cathode is the electrode

Accepted Answer

A)  that attracts anions.
B)  at which electrons are collected from electron donors in the solution.
C)  at which reduction occurs.
D)  at which oxidation occurs.
E)  that is made of graphite.

Question 2

Which of the following statements regarding oxidation-reduction reactions is correct?

Accepted Answer

A)  Oxidation-reduction reactions involve sharing electrons.
B)  Oxidation can occur without reduction.
C)  You can tell that a substance is oxidized if it loses electrons.
D)  You can tell that a substance is reduced if its oxidation number increases.
E)  None of these statements is correct.

Question 3

A species that causes a decrease in the oxidation number of another substance is called a reducing agent.

Accepted Answer

A) True 
 B)False

Question 4

In which compound does phosphorus have an oxidation number of 3+?

Accepted Answer

A)  AlPO4 
B)  PF5 
C)  H3PO4 
D)  H3PO3 
E)  PH3

Question 5

Consider the reaction: H3AsO3(aq)  + BiO3-(aq)   →\rightarrow→ H3AsO4(aq)  + Bi(s)  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)  2, 6
B)  2, 1
C)  1, 10
D)  1, 2
E)  2, 3

Question 6

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 oxidized in this battery is:

Accepted Answer

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

Question 7

The figure shows the electrolysis of molten NaI.What reaction occurs at the anode of this cell? +(l)  + I-(l)  B) NaI(l)   \rightarrow Na(l)  + I(g)  C) NaI(s)  \rightarrow Na+(aq)  + I-(aq)  D) 2NaI(s)   \rightarrow  2Na(s)  + I2(s)  E) 2NaI(l)   \rightarrow  2Na(l)  + I2(g)  " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  NaI(l)   →\rightarrow→  Na+(l)  + I-(l) 
B)  NaI(l)   →\rightarrow→ Na(l)  + I(g) 
C)  NaI(s)  →\rightarrow→ Na+(aq)  + I-(aq) 
D)  2NaI(s)   →\rightarrow→  2Na(s)  + I2(s) 
E)  2NaI(l)   →\rightarrow→  2Na(l)  + I2(g)

Question 8

The change, Br2 + H2O  →\rightarrow→   HOBr + HBr, is

Accepted Answer

A)  oxidation only.
B)  reduction only.
C)  both oxidation and reduction.
D)  neither oxidation nor reduction.
E)  an acid-base reaction.

Question 9

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 the reducing agent in this battery is:

Accepted Answer

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

Question 10

Consider the half-reaction Cr3+(aq)   →\rightarrow→  Cr2O72-(aq) .When the equation is balanced in acid solution, the coefficient for water will be__________, and the number of electrons transferred will be __________.

Accepted Answer

A)  3, 3
B)  6, 6
C)  7, 6
D)  5, 4
E)  3, 6

Question 11

All of these statements concerning oxidation are correct except that

Accepted Answer

A)  oxygen is necessary for oxidation to take place.
B)  the oxidizing agent receives electrons from another species.
C)  oxidation must accompany reduction.
D)  the oxidizing agent increases the oxidation number of another element.
E)  the oxidation of a metal produces positive ions.

Question 12

Consider the reaction: Al(s)  + H2O(l)   →\rightarrow→  Al(OH) 4-(aq)  + H2(g)  When this equation is balanced in basic solution, the coefficient for water will be__________, and the number of electrons transferred will be __________.

Accepted Answer

A)  3, 3
B)  2, 1
C)  6, 8
D)  6, 6
E)  2, 3

Question 13

For the following reaction, what is the oxidizing agent? 2Cl2(g)  + C(s)  + 2H2O(l)   →\rightarrow→   CO2(g)  + 4HCl(aq)

Accepted Answer

A)  Cl2 
B)  C
C)  H2O
D)  CO2 
E)  HCl

Question 14

Consider the reaction: Sn2+(aq)  + 2Fe3+(aq)   →\rightarrow→ Sn4+(aq)  + 2Fe2+(aq)  Which species is oxidized, 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

Question 15

What is the oxidation number of boron in sodium tetraborate, Na2B4O7?

Accepted Answer

A)  +12
B)  -3
C)  +14
D)  +3
E)  +4

Question 16

A voltaic cell is prepared in which copper metal is oxidized to Cu(II) , and silver ion is reduced to silver metal.Which of the following represents the equation for the reaction that occurs at the anode?

Accepted Answer

A)  Cu(s)  - 2e- →\rightarrow→ Cu2+(aq) 
B)  Cu(s)   →\rightarrow→  Cu2+(aq)  + 2e- 
C)  2Cu(s)   →\rightarrow→ 2Cu2+(aq)  + e- 
D)  Ag+(aq)  + e-  →\rightarrow→  Ag(s) 
E)  Ag(s)   →\rightarrow→  Ag+(aq)  + e-

Question 17

Consider the following reaction: Mg(s)  + ZnSO4(aq)   →\rightarrow→  MgSO4(aq)  + Zn(s)  Which of the following statements regarding this reaction is correct?

Accepted Answer

A)  Magnesium is neither oxidized nor reduced.
B)  The sulfate ion is reduced.
C)  Zinc is the reducing agent.
D)  Magnesium is the oxidizing agent.
E)  Zinc gains two electrons.

Question 18

Consider a voltaic cell that corresponds to the following reaction: Zn(s)  + Cu2+(aq)   →\rightarrow→ Zn2+(aq)  + Cu(s)  Which of the following statements is correct?

Accepted Answer

A)  Zinc is the oxidizing agent.
B)  The Cu2+ solution must be in the half-cell with the zinc electrode.
C)  No salt bridge is necessary, since the charge is 2+ on both sides of the equation.
D)  The zinc electrode is the cathode.
E)  Two electrons will be transferred in this reaction per atom of zinc that reacts.

Question 19

Given the following reaction in a voltaic cell: Zn(s)  + Ni2+(aq)  →\rightarrow→ Ni(s)  + Zn2+(aq)  In this cell, Zn(s)  is called the

Accepted Answer

A)  anode.
B)  oxidizing agent.
C)  salt bridge.
D)  electrolyte.
E)  cathode.

Question 20

Consider the reaction: N2(g)  + 3H2(g)   →\rightarrow→   2NH3(g)  Which of the following statements is correct?

Accepted Answer

A)  Nitrogen is oxidized.
B)  Hydrogen is reduced.
C)  Nitrogen is the reducing agent.
D)  The reaction is not an oxidation-reduction reaction.
E)  Hydrogen is the reducing agent.

Exam 14: Oxidation-Reduction Reactions

Consider the half-reaction Cr³⁺(aq) $\rightarrow$ Cr₂O₇²^-(aq) .When the equation is balanced in acid solution, the coefficient for water will be, and the number of electrons transferred will be .

Correct Answer
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A species that causes a decrease in the oxidation number of another substance is called a reducing agent.

Correct Answer
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In any electrolytic cell, the cathode is the electrode

Correct Answer
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All of these statements concerning oxidation are correct except that

Correct Answer
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Correct Answer
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Which of the following statements regarding oxidation-reduction reactions is correct?

Correct Answer
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Consider a voltaic cell that corresponds to the following reaction: Zn(s) + Cu²⁺(aq) $\rightarrow$ Zn²⁺(aq) + Cu(s) Which of the following statements is correct?

Correct Answer
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Consider the reaction: H₃AsO₃(aq) + BiO₃^-(aq) $\rightarrow$ H₃AsO₄(aq) + Bi(s) When this equation is balanced in acidic solution, the coefficient for water will be, and the number of electrons transferred will be .

Correct Answer
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In which compound does phosphorus have an oxidation number of 3+?

Correct Answer
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The change, Br₂ + H₂O $\rightarrow$ HOBr + HBr, is

Correct Answer
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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 oxidized in this battery is:

Correct Answer
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A voltaic cell is prepared in which copper metal is oxidized to Cu(II) , and silver ion is reduced to silver metal.Which of the following represents the equation for the reaction that occurs at the anode?

Correct Answer
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Consider the reaction: N₂(g) + 3H₂(g) $\rightarrow$ 2NH₃(g) Which of the following statements is correct?

Correct Answer
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Consider the reaction: Al(s) + H₂O(l) $\rightarrow$ Al(OH) ₄-(aq) + H₂(g) When this equation is balanced in basic solution, the coefficient for water will be, and the number of electrons transferred will be .

Correct Answer
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Consider the reaction: Sn²⁺(aq) + 2Fe³⁺(aq) $\rightarrow$ Sn⁴⁺(aq) + 2Fe²⁺(aq) Which species is oxidized, and how many electrons are transferred per SN₂+ ion that reacts?

Correct Answer
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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 the reducing agent in this battery is:

Correct Answer
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For the following reaction, what is the oxidizing agent? 2Cl₂(g) + C(s) + 2H₂O(l) $\rightarrow$ CO₂(g) + 4HCl(aq)

Correct Answer
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What is the oxidation number of boron in sodium tetraborate, Na₂B₄O₇?

Correct Answer
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Consider the following reaction: Mg(s) + ZnSO₄(aq) $\rightarrow$ MgSO₄(aq) + Zn(s) Which of the following statements regarding this reaction is correct?

Correct Answer
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Given the following reaction in a voltaic cell: Zn(s) + Ni²⁺(aq) $\rightarrow$ Ni(s) + Zn²⁺(aq) In this cell, Zn(s) is called the

Correct Answer
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Exam 14: Oxidation-Reduction Reactions

Consider the half-reaction Cr3+(aq) →\rightarrow→ Cr2O72-(aq) .When the equation is balanced in acid solution, the coefficient for water will be__________, and the number of electrons transferred will be __________.

Correct AnswerverifiedShow Answer

A species that causes a decrease in the oxidation number of another substance is called a reducing agent.

Correct AnswerverifiedShow Answer

In any electrolytic cell, the cathode is the electrode

Correct AnswerverifiedShow Answer

All of these statements concerning oxidation are correct except that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following statements regarding oxidation-reduction reactions is correct?

Correct AnswerverifiedShow Answer

Consider a voltaic cell that corresponds to the following reaction: Zn(s) + Cu2+(aq) →\rightarrow→ Zn2+(aq) + Cu(s) Which of the following statements is correct?

Correct AnswerverifiedShow Answer

Consider the reaction: H3AsO3(aq) + BiO3-(aq) →\rightarrow→ H3AsO4(aq) + Bi(s) When this equation is balanced in acidic solution, the coefficient for water will be__________, and the number of electrons transferred will be __________.

Correct AnswerverifiedShow Answer

In which compound does phosphorus have an oxidation number of 3+?

Correct AnswerverifiedShow Answer

The change, Br2 + H2O →\rightarrow→ HOBr + HBr, is

Correct AnswerverifiedShow Answer

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 oxidized in this battery is:

Correct AnswerverifiedShow Answer

A voltaic cell is prepared in which copper metal is oxidized to Cu(II) , and silver ion is reduced to silver metal.Which of the following represents the equation for the reaction that occurs at the anode?

Correct AnswerverifiedShow Answer

Consider the reaction: N2(g) + 3H2(g) →\rightarrow→ 2NH3(g) Which of the following statements is correct?

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Consider the reaction: Al(s) + H2O(l) →\rightarrow→ Al(OH) 4-(aq) + H2(g) When this equation is balanced in basic solution, the coefficient for water will be__________, and the number of electrons transferred will be __________.

Correct AnswerverifiedShow Answer

Consider the reaction: Sn2+(aq) + 2Fe3+(aq) →\rightarrow→ Sn4+(aq) + 2Fe2+(aq) Which species is oxidized, and how many electrons are transferred per SN2+ ion that reacts?

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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 the reducing agent in this battery is:

Correct AnswerverifiedShow Answer

For the following reaction, what is the oxidizing agent? 2Cl2(g) + C(s) + 2H2O(l) →\rightarrow→ CO2(g) + 4HCl(aq)

Correct AnswerverifiedShow Answer

What is the oxidation number of boron in sodium tetraborate, Na2B4O7?

Correct AnswerverifiedShow Answer

Consider the following reaction: Mg(s) + ZnSO4(aq) →\rightarrow→ MgSO4(aq) + Zn(s) Which of the following statements regarding this reaction is correct?

Correct AnswerverifiedShow Answer

Given the following reaction in a voltaic cell: Zn(s) + Ni2+(aq) →\rightarrow→ Ni(s) + Zn2+(aq) In this cell, Zn(s) is called the

Correct AnswerverifiedShow Answer

Consider the half-reaction Cr³⁺(aq) $\rightarrow$ Cr₂O₇²^-(aq) .When the equation is balanced in acid solution, the coefficient for water will be, and the number of electrons transferred will be .

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Consider a voltaic cell that corresponds to the following reaction: Zn(s) + Cu²⁺(aq) $\rightarrow$ Zn²⁺(aq) + Cu(s) Which of the following statements is correct?

Correct Answer
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Consider the reaction: H₃AsO₃(aq) + BiO₃^-(aq) $\rightarrow$ H₃AsO₄(aq) + Bi(s) When this equation is balanced in acidic solution, the coefficient for water will be, and the number of electrons transferred will be .

Correct Answer
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Correct Answer
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The change, Br₂ + H₂O $\rightarrow$ HOBr + HBr, is

Correct Answer
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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 oxidized in this battery is:

Correct Answer
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Correct Answer
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Consider the reaction: N₂(g) + 3H₂(g) $\rightarrow$ 2NH₃(g) Which of the following statements is correct?

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Consider the reaction: Al(s) + H₂O(l) $\rightarrow$ Al(OH) ₄-(aq) + H₂(g) When this equation is balanced in basic solution, the coefficient for water will be, and the number of electrons transferred will be .

Correct Answer
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Consider the reaction: Sn²⁺(aq) + 2Fe³⁺(aq) $\rightarrow$ Sn⁴⁺(aq) + 2Fe²⁺(aq) Which species is oxidized, and how many electrons are transferred per SN₂+ ion that reacts?

Correct Answer
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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 the reducing agent in this battery is:

Correct Answer
verified

For the following reaction, what is the oxidizing agent? 2Cl₂(g) + C(s) + 2H₂O(l) $\rightarrow$ CO₂(g) + 4HCl(aq)

Correct Answer
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What is the oxidation number of boron in sodium tetraborate, Na₂B₄O₇?

Correct Answer
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Consider the following reaction: Mg(s) + ZnSO₄(aq) $\rightarrow$ MgSO₄(aq) + Zn(s) Which of the following statements regarding this reaction is correct?

Correct Answer
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Given the following reaction in a voltaic cell: Zn(s) + Ni²⁺(aq) $\rightarrow$ Ni(s) + Zn²⁺(aq) In this cell, Zn(s) is called the

Correct Answer
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