Question 1

When the given oxidation-reduction reaction in an acidic solution is balanced, what is the lowest whole-number coefficient for H⁺, and on which side of the balanced equation should it appear? MnO₄^-(aq) + Br^-(aq) → Mn²⁺(aq) + Br₂(l)

Accepted Answer

D

Question 2

Balance the following half-reaction occurring in a basic solution. MnO₂(s) → Mn(OH)₂(s)

Accepted Answer

The correct choice is A because it properly balances the half-reaction in a basic solution by adding water (H₂O) to balance the oxygen atoms and adding hydroxide ions (OH⁻) to both sides to balance the hydrogen atoms, while also incorporating the necessary electrons to balance the charge.

Question 3

Write the balanced reduction half-reaction for the following overall reaction: 
2 Fe(s) + 3 Cl2(aq) → 2 Fe3+(aq) + 6 Cl-(aq)

Accepted Answer

A

Question 4

When the following oxidation-reduction reaction in acidic solution is balanced, what is the lowest whole-number coefficient for Na⁺(aq) ion? Na(s) + Ca²⁺(aq) → Na⁺(aq) + Ca(s)

Accepted Answer

The answer of When the following oxidation-reduction reaction in acidic...

Question 5

Balance the following oxidation-reduction reaction occurring in an acidic solution. MnO₄^-(aq) + Cr²⁺(aq) → Mn²⁺(aq) + Cr³⁺(aq)

Accepted Answer

The answer of Balance the following oxidation-reduction reaction occurring in...

Question 6

Which of the following reactions will require the use of an inert electrode when used in a voltaic cell?

Accepted Answer

Inert electrodes are required when the reactants or products do not include a solid metal that can serve as an electrode. In option D, the reaction involves MnO2 and NH4+, which do not provide a solid metal electrode, necessitating the use of an inert electrode for the voltaic cell to function.

Question 7

Which of the following is the cell notation for a voltaic cell based on the following reaction? Cu²⁺(aq) + Fe(s) → Cu(s) + Fe²⁺(aq)

Accepted Answer

The correct cell notation for a voltaic cell is written from the anode (oxidation) to the cathode (reduction). In the given reaction, Fe(s) is oxidized to Fe^2+ and Cu^2+ is reduced to Cu(s), making Fe the anode and Cu the cathode. Therefore, the notation starts with Fe(s) at the anode side and ends with Cu(s) at the cathode side, separated by a double vertical line (||) indicating the salt bridge.

Question 8

Write a balanced half-reaction for the reduction of CrO₄^2-(aq) to Cr(OH)₃(s) in a basic solution.

Accepted Answer

In a basic solution, water and hydroxide ions are used to balance the oxygen and hydrogen atoms. The correct half-reaction is balanced for mass and charge, with water and hydroxide ions appropriately placed.

Question 9

Which of the following statements concerning voltaic cells is not true?

Accepted Answer

In a voltaic cell, electrons flow from the anode to the cathode in the external circuit, not from the cathode to the anode as stated in option B.

Question 10

Write a balanced chemical equation for the following reaction in a basic solution. ClO^-(aq) + Cr(OH)₃(s) ? Cl^-(aq) + CrO₄^2-(aq)

Accepted Answer

In a basic solution, the balanced equation is: 3 ClO^-(aq) + 2 Cr(OH)₃(s) + 4 OH^-(aq) ? 3 Cl^-(aq) + 2 CrO₄^2-(aq) + 5 H₂O( $\ell$ ). This balances both the atoms and charges in the reaction.

Question 11

Write the balanced oxidation half-reaction for the following overall reaction: 2 H⁺(aq) + Ca(s) → Ca²⁺(aq) + H₂(g)

Accepted Answer

The answer of Write the balanced oxidation half-reaction for the...

Question 12

Which of the following statements is true for the following reaction, assuming the given reaction proceeds in the forward direction? Fe³⁺(aq) + Co(s) → Fe²⁺(aq) + Co²⁺(aq)

Accepted Answer

The answer of Which of the following statements is true...

Question 13

Write a balanced chemical equation for the oxidation of solid cadmium by concentrated nitric acid, producing nitrogen dioxide gas and Cd²⁺(aq) ion.

Accepted Answer

The balanced equation for the oxidation of cadmium by concentrated nitric acid is: 4 HNO₃(aq) + Cd(s) → Cd²⁺(aq) + 2 NO₂(g) + 2 H₂O(ℓ) + 2 NO₃⁻(aq). This equation accounts for the conservation of mass and charge, with cadmium being oxidized to Cd²⁺ and nitric acid being reduced to nitrogen dioxide and water.

Question 14

How many electrons are transferred in the given reaction? Ni + 2 HCl → Ni Cl₂ + H₂

Accepted Answer

In the reaction, nickel (Ni) reacts with hydrochloric acid (HCl) to form nickel chloride (NiCl2) and hydrogen gas (H2). Nickel goes from a 0 oxidation state to a +2 oxidation state, meaning it loses 2 electrons. Hydrogen goes from a +1 oxidation state in HCl to a 0 oxidation state in H2, each hydrogen atom gains 1 electron, but since there are 2 hydrogen atoms involved, they collectively gain 2 electrons. Thus, 2 electrons are transferred in total.

Question 15

Which of the following statements is true for the following reaction, assuming the given reaction proceeds in the forward direction? 3 Sn⁴⁺(aq) + 2 Cr(s) → 3 Sn²⁺(aq) + 2 Cr³⁺(aq)

Accepted Answer

The answer of Which of the following statements is true...

Question 16

Write a balanced half-reaction for the reduction of hydrogen peroxide to water in an acidic solution.

Accepted Answer

The balanced half-reaction for the reduction of hydrogen peroxide to water in an acidic solution is: H₂O₂(ℓ) + 2 H⁺(aq) + 2 e⁻ → 2 H₂O(ℓ). This equation shows the reduction of H₂O₂ to water with the addition of protons and electrons, which is typical in acidic conditions.

Question 17

In the context of the diagram given below, which of the following statements is true concerning half-cell II?

Accepted Answer

The answer of In the context of the diagram given...

Question 18

Balance the following half-reaction occurring in an acidic solution. NO₃^-(aq) → NO(aq)

Accepted Answer

The correct answer is A because it properly balances the half-reaction in an acidic solution by adding 4 H+ ions and 3 electrons to the reactant side and forming NO gas and 2 H2O molecules on the product side, maintaining both mass and charge balance.

Question 19

Write a balanced net ionic equation for the reaction below in an acidic solution. Cr₂O₇^2-(aq) + Ni(s) ? Cr³⁺(aq) + Ni²⁺(aq)

Accepted Answer

In acidic solution, the dichromate ion (Cr2O7^2-) is reduced to Cr^3+ and Ni is oxidized to Ni^2+. The balanced equation requires 3 Ni atoms to balance the electrons transferred, and 14 H+ ions to balance the oxygen atoms as water molecules.

Question 20

Which of the following statements is true concerning the voltaic cell shown below?

Accepted Answer

The answer of Which of the following statements is true...

Quiz 20: Principles of Chemical Reactivity: Electron Transfer Reactions

When the given oxidation-reduction reaction in an acidic solution is balanced, what is the lowest whole-number coefficient for H⁺, and on which side of the balanced equation should it appear? MnO₄^-(aq) + Br^-(aq) → Mn²⁺(aq) + Br₂(l)

Balance the following half-reaction occurring in a basic solution. MnO₂(s) → Mn(OH) ₂(s)

Write the balanced reduction half-reaction for the following overall reaction: 2 Fe(s) + 3 Cl2(aq) → 2 Fe3+(aq) + 6 Cl-(aq)

When the following oxidation-reduction reaction in acidic solution is balanced, what is the lowest whole-number coefficient for Na⁺(aq) ion? Na(s) + Ca²⁺(aq) → Na⁺(aq) + Ca(s)

Balance the following oxidation-reduction reaction occurring in an acidic solution. MnO₄^-(aq) + Cr²⁺(aq) → Mn²⁺(aq) + Cr³⁺(aq)

Which of the following reactions will require the use of an inert electrode when used in a voltaic cell?

Which of the following is the cell notation for a voltaic cell based on the following reaction? Cu²⁺(aq) + Fe(s) → Cu(s) + Fe²⁺(aq)

Write a balanced half-reaction for the reduction of CrO₄^2-(aq) to Cr(OH) ₃(s) in a basic solution.

Which of the following statements concerning voltaic cells is not true?

Write a balanced chemical equation for the following reaction in a basic solution. ClO^-(aq) + Cr(OH) ₃(s) ? Cl^-(aq) + CrO₄^2-(aq)

Write the balanced oxidation half-reaction for the following overall reaction: 2 H⁺(aq) + Ca(s) → Ca²⁺(aq) + H₂(g)

Which of the following statements is true for the following reaction, assuming the given reaction proceeds in the forward direction? Fe³⁺(aq) + Co(s) → Fe²⁺(aq) + Co²⁺(aq)

Write a balanced chemical equation for the oxidation of solid cadmium by concentrated nitric acid, producing nitrogen dioxide gas and Cd²⁺(aq) ion.

How many electrons are transferred in the given reaction? Ni + 2 HCl → Ni Cl₂ + H₂

Which of the following statements is true for the following reaction, assuming the given reaction proceeds in the forward direction? 3 Sn⁴⁺(aq) + 2 Cr(s) → 3 Sn²⁺(aq) + 2 Cr³⁺(aq)

Write a balanced half-reaction for the reduction of hydrogen peroxide to water in an acidic solution.

In the context of the diagram given below, which of the following statements is true concerning half-cell II?

Balance the following half-reaction occurring in an acidic solution. NO₃^-(aq) → NO(aq)

Write a balanced net ionic equation for the reaction below in an acidic solution. Cr₂O₇^2-(aq) + Ni(s) ? Cr³⁺(aq) + Ni²⁺(aq)

Which of the following statements is true concerning the voltaic cell shown below?

Quiz 20: Principles of Chemical Reactivity: Electron Transfer Reactions

When the given oxidation-reduction reaction in an acidic solution is balanced, what is the lowest whole-number coefficient for H+, and on which side of the balanced equation should it appear? MnO4-(aq) + Br-(aq) → Mn2+(aq) + Br2(l)

Balance the following half-reaction occurring in a basic solution. MnO2(s) → Mn(OH) 2(s)

Write the balanced reduction half-reaction for the following overall reaction: 2 Fe(s) + 3 Cl2(aq) → 2 Fe3+(aq) + 6 Cl-(aq)

When the following oxidation-reduction reaction in acidic solution is balanced, what is the lowest whole-number coefficient for Na+(aq) ion? Na(s) + Ca2+(aq) → Na+(aq) + Ca(s)

Balance the following oxidation-reduction reaction occurring in an acidic solution. MnO4-(aq) + Cr2+(aq) → Mn2+(aq) + Cr3+(aq)

Which of the following reactions will require the use of an inert electrode when used in a voltaic cell?

Which of the following is the cell notation for a voltaic cell based on the following reaction? Cu2+(aq) + Fe(s) → Cu(s) + Fe2+(aq)

Write a balanced half-reaction for the reduction of CrO42-(aq) to Cr(OH) 3(s) in a basic solution.

Which of the following statements concerning voltaic cells is not true?

Write a balanced chemical equation for the following reaction in a basic solution. ClO-(aq) + Cr(OH) 3(s) ? Cl-(aq) + CrO42-(aq)

Write the balanced oxidation half-reaction for the following overall reaction: 2 H+(aq) + Ca(s) → Ca2+(aq) + H2(g)

Which of the following statements is true for the following reaction, assuming the given reaction proceeds in the forward direction? Fe3+(aq) + Co(s) → Fe2+(aq) + Co2+(aq)

Write a balanced chemical equation for the oxidation of solid cadmium by concentrated nitric acid, producing nitrogen dioxide gas and Cd2+(aq) ion.

How many electrons are transferred in the given reaction? Ni + 2 HCl → Ni Cl2 + H2

Which of the following statements is true for the following reaction, assuming the given reaction proceeds in the forward direction? 3 Sn4+(aq) + 2 Cr(s) → 3 Sn2+(aq) + 2 Cr3+(aq)

Write a balanced half-reaction for the reduction of hydrogen peroxide to water in an acidic solution.

In the context of the diagram given below, which of the following statements is true concerning half-cell II?

Balance the following half-reaction occurring in an acidic solution. NO3-(aq) → NO(aq)

Write a balanced net ionic equation for the reaction below in an acidic solution. Cr2O72-(aq) + Ni(s) ? Cr3+(aq) + Ni2+(aq)

Which of the following statements is true concerning the voltaic cell shown below?

When the given oxidation-reduction reaction in an acidic solution is balanced, what is the lowest whole-number coefficient for H⁺, and on which side of the balanced equation should it appear? MnO₄^-(aq) + Br^-(aq) → Mn²⁺(aq) + Br₂(l)

Balance the following half-reaction occurring in a basic solution. MnO₂(s) → Mn(OH) ₂(s)

When the following oxidation-reduction reaction in acidic solution is balanced, what is the lowest whole-number coefficient for Na⁺(aq) ion? Na(s) + Ca²⁺(aq) → Na⁺(aq) + Ca(s)

Balance the following oxidation-reduction reaction occurring in an acidic solution. MnO₄^-(aq) + Cr²⁺(aq) → Mn²⁺(aq) + Cr³⁺(aq)

Which of the following is the cell notation for a voltaic cell based on the following reaction? Cu²⁺(aq) + Fe(s) → Cu(s) + Fe²⁺(aq)

Write a balanced half-reaction for the reduction of CrO₄^2-(aq) to Cr(OH) ₃(s) in a basic solution.

Write a balanced chemical equation for the following reaction in a basic solution. ClO^-(aq) + Cr(OH) ₃(s) ? Cl^-(aq) + CrO₄^2-(aq)

Write the balanced oxidation half-reaction for the following overall reaction: 2 H⁺(aq) + Ca(s) → Ca²⁺(aq) + H₂(g)

Which of the following statements is true for the following reaction, assuming the given reaction proceeds in the forward direction? Fe³⁺(aq) + Co(s) → Fe²⁺(aq) + Co²⁺(aq)

Write a balanced chemical equation for the oxidation of solid cadmium by concentrated nitric acid, producing nitrogen dioxide gas and Cd²⁺(aq) ion.

How many electrons are transferred in the given reaction? Ni + 2 HCl → Ni Cl₂ + H₂

Which of the following statements is true for the following reaction, assuming the given reaction proceeds in the forward direction? 3 Sn⁴⁺(aq) + 2 Cr(s) → 3 Sn²⁺(aq) + 2 Cr³⁺(aq)

Balance the following half-reaction occurring in an acidic solution. NO₃^-(aq) → NO(aq)

Write a balanced net ionic equation for the reaction below in an acidic solution. Cr₂O₇^2-(aq) + Ni(s) ? Cr³⁺(aq) + Ni²⁺(aq)