Question 1

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

The answer of A voltaic cell is prepared in which...

Question 2

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

In the given reaction, Zn is oxidized (loses electrons) and HgO is reduced (gains electrons) to form Hg. Therefore, the substance that is oxidized in this battery is Zn.

Question 3

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

In the given reaction, Zn is being oxidized to form ZnO. Therefore, the substance that is oxidized in this battery is Zn.

Question 4

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

MnO₂ is reduced to Mn(OH)₂ as it gains electrons during the reaction.

Question 5

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

The answer of The following reaction occurs in acid solution.When...

Question 6

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 correctly balanced equation for this reaction?

Accepted Answer

The balanced equation for the reaction is Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s). This equation shows the oxidation of copper to Cu2+ and the reduction of Ag+ to Ag, with the appropriate stoichiometric coefficients. Choice C is the only answer option that correctly reflects this equation.

Question 7

A voltaic cell is prepared in which aluminum metal is oxidized to Al³⁺, and nickel(II) is reduced to nickel metal.Which of the following represents the equation for the reaction that occurs at the anode?

Accepted Answer

The anode is where oxidation occurs. In this cell, aluminum metal is oxidized to Al³⁺, which is represented by the equation Al(s) $\rightarrow$ Al³⁺(aq) + 3e^-.

Question 8

The following reaction occurs in a lead storage battery: PbO₂(s) + Pb(s) + H₂SO₄(aq) ⇌ 2PbSO₄(s) + 2H₂O(l) Which statement is true?

Accepted Answer

During charging, PbO2 is reformed at the anode as the battery is restored to its original state.

Question 9

The following reaction occurs in acid solution.When the equation is properly balanced with the smallest whole-number coefficients, what is the coefficient of MnO₄-$\rightarrow$MnO₄-(aq) + I^-(aq) $\rightarrow$ Mn²⁺(aq) + I²(aq)

Accepted Answer

The answer of The following reaction occurs in acid solution.When...

Question 10

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

In a voltaic cell, oxidation occurs at the anode and reduction occurs at the cathode. Since Zn(s) is undergoing oxidation (it is losing electrons), it must be the anode.

Question 11

Consider the skeletal equation: Sn²⁺(aq) + Fe³⁺(aq) $\rightarrow$Sn⁴⁺(aq) + Fe²⁺(aq) When balanced, the equation will be:

Accepted Answer

The balanced equation requires equal numbers of electrons transferred. Sn²⁺ loses 2 electrons to become Sn⁴⁺, and each Fe³⁺ gains 1 electron to become Fe²⁺. Therefore, 2 Fe³⁺ are needed for every Sn²⁺.

Question 12

The figure shows a molecular-level representation of the following voltaic cell: Mg(s) + Sn²⁺(aq) $\rightarrow$ Mg²⁺(aq) + Sn(s) When drawing the "after" representation one would note that:

Accepted Answer

The answer of The figure shows a molecular-level representation of...

Question 13

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 oxidizing agent in this battery is:

Accepted Answer

PbO₂ is the oxidizing agent because it gains electrons and is reduced in the reaction.

Question 14

The figure shows a molecular-level representation of the following voltaic cell: Fe(s) + Ni²⁺(aq) $\rightarrow$Fe²⁺(aq) + Ni(s) When drawing the "after" representation one would note that:

Accepted Answer

The answer of The figure shows a molecular-level representation of...

Question 15

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

First, we need to balance the half-reaction in acidic solution. 
CrS1U1P13 + 7 H1U1B12O1U1P0S1U1B17S1U1B0S1U1P12 + 6 F1F1F1S1-  ->  Cr3+ + 3 S1U1B12O1U1P0S1U1B17S1U1B0S1U1P12 + 6 F1F1F10 + 5 H2O 
The coefficient for water is 5 and the number of electrons transferred is 6. Therefore, the answer is C.

Question 16

The following reaction occurs in a lead storage battery: PbO₂(s) + Pb(s) + H₂SO₄(aq) ⇌ 2PbSO₄(s) + 2H₂O(l) What happens to the sulfuric acid in a lead storage battery when the battery is being discharged?

Accepted Answer

During the discharge of a lead storage battery, sulfate ions from sulfuric acid are consumed to form lead sulfate, thus decreasing the concentration of sulfuric acid in the solution.

Question 17

A voltaic cell is prepared in which aluminum metal is oxidized to Al³⁺, and nickel(II) is reduced to nickel metal.Which of the following represents the correctly balanced equation for this reaction?

Accepted Answer

The balanced equation is: 2Al(s) + 3Ni2+(aq) -> 2Al3+(aq) + 3Ni(s) 
The equation shows that aluminum is oxidized to Al3+ and nickel(II) is reduced to nickel. Choice C is the only option that accurately represents this balanced reaction.

Question 18

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

The reducing agent in a redox reaction is the substance that is oxidized, meaning it loses electrons. In this case, Pb (s) is oxidized to PbSO4 (s), meaning it loses electrons and is the reducing agent.

Question 19

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

In a redox reaction, the substance that is oxidized loses electrons and the substance that is reduced gains electrons. In the given reaction, PbO and Pb are both oxidized to form PbSO4, while H2SO4 is reduced to form H2O. Therefore, the substance that is reduced in this battery is H2SO4, which corresponds to choice C.

Question 20

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 the reducing agent in this battery is:

Accepted Answer

The reducing agent is the substance that is oxidized in a redox reaction. In this case, the Zn(s) is oxidized to ZnO(s), so it is the reducing agent.

Quiz 14: Oxidation-Reduction Reactions

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?

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:

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:

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 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)

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 correctly balanced equation for this reaction?

A voltaic cell is prepared in which aluminum metal is oxidized to Al³⁺, and nickel(II) is reduced to nickel metal.Which of the following represents the equation for the reaction that occurs at the anode?

The following reaction occurs in a lead storage battery: PbO₂(s) + Pb(s) + H₂SO₄(aq) ⇌ 2PbSO₄(s) + 2H₂O(l) Which statement is true?

The following reaction occurs in acid solution.When the equation is properly balanced with the smallest whole-number coefficients, what is the coefficient of MnO₄- $\rightarrow$ MnO₄-(aq) + I^-(aq) $\rightarrow$ Mn²⁺(aq) + I²(aq)

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

Consider the skeletal equation: Sn²⁺(aq) + Fe³⁺(aq) $\rightarrow$ Sn⁴⁺(aq) + Fe²⁺(aq) When balanced, the equation will be:

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 oxidizing agent in this battery is:

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 .

The following reaction occurs in a lead storage battery: PbO₂(s) + Pb(s) + H₂SO₄(aq) ⇌ 2PbSO₄(s) + 2H₂O(l) What happens to the sulfuric acid in a lead storage battery when the battery is being discharged?

A voltaic cell is prepared in which aluminum metal is oxidized to Al³⁺, and nickel(II) is reduced to nickel metal.Which of the following represents the correctly balanced equation for this reaction?

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:

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:

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 the reducing agent in this battery is:

Quiz 14: Oxidation-Reduction Reactions

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?

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:

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:

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 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)

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 correctly balanced equation for this reaction?

A voltaic cell is prepared in which aluminum metal is oxidized to Al3+, and nickel(II) is reduced to nickel metal.Which of the following represents the equation for the reaction that occurs at the anode?

The following reaction occurs in a lead storage battery: PbO2(s) + Pb(s) + H2SO4(aq) ⇌ 2PbSO4(s) + 2H2O(l) Which statement is true?

The following reaction occurs in acid solution.When the equation is properly balanced with the smallest whole-number coefficients, what is the coefficient of MnO4- →\rightarrow→ MnO4-(aq) + I-(aq) →\rightarrow→ Mn2+(aq) + I2(aq)

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

Consider the skeletal equation: Sn2+(aq) + Fe3+(aq) →\rightarrow→ Sn4+(aq) + Fe2+(aq) When balanced, the equation will be:

The figure shows a molecular-level representation of the following voltaic cell: Mg(s) + Sn2+(aq) →\rightarrow→ Mg2+(aq) + Sn(s) When drawing the "after" representation one would note that:

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 oxidizing agent in this battery is:

The figure shows a molecular-level representation of the following voltaic cell: Fe(s) + Ni2+(aq) →\rightarrow→ Fe2+(aq) + Ni(s) When drawing the "after" representation one would note that:

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 __________.

The following reaction occurs in a lead storage battery: PbO2(s) + Pb(s) + H2SO4(aq) ⇌ 2PbSO4(s) + 2H2O(l) What happens to the sulfuric acid in a lead storage battery when the battery is being discharged?

A voltaic cell is prepared in which aluminum metal is oxidized to Al3+, and nickel(II) is reduced to nickel metal.Which of the following represents the correctly balanced equation for this reaction?

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:

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:

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 the reducing agent 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:

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:

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 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)

A voltaic cell is prepared in which aluminum metal is oxidized to Al³⁺, and nickel(II) is reduced to nickel metal.Which of the following represents the equation for the reaction that occurs at the anode?

The following reaction occurs in a lead storage battery: PbO₂(s) + Pb(s) + H₂SO₄(aq) ⇌ 2PbSO₄(s) + 2H₂O(l) Which statement is true?

The following reaction occurs in acid solution.When the equation is properly balanced with the smallest whole-number coefficients, what is the coefficient of MnO₄- $\rightarrow$ MnO₄-(aq) + I^-(aq) $\rightarrow$ Mn²⁺(aq) + I²(aq)

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

Consider the skeletal equation: Sn²⁺(aq) + Fe³⁺(aq) $\rightarrow$ Sn⁴⁺(aq) + Fe²⁺(aq) When balanced, the equation will be:

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 oxidizing agent in this battery is:

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 .

The following reaction occurs in a lead storage battery: PbO₂(s) + Pb(s) + H₂SO₄(aq) ⇌ 2PbSO₄(s) + 2H₂O(l) What happens to the sulfuric acid in a lead storage battery when the battery is being discharged?

A voltaic cell is prepared in which aluminum metal is oxidized to Al³⁺, and nickel(II) is reduced to nickel metal.Which of the following represents the correctly balanced equation for this reaction?

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:

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:

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 the reducing agent in this battery is: