Question 1

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 2

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

Accepted Answer

A

Question 3

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 4

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 answer of Write a balanced chemical equation for the...

Question 5

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 6

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

Accepted Answer

The oxidation half-reaction involves the loss of electrons. Calcium (Ca) loses two electrons to form Ca²⁺, which is represented by the equation: Ca(s) → 2e⁻ + Ca²⁺(aq).

Question 7

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

Accepted Answer

The balanced equation in acidic solution requires balancing the number of electrons transferred. MnO4- is reduced to Mn2+, and Cr2+ is oxidized to Cr3+. The balanced equation is: MnO4- + 8 H+ + 5 Cr2+ → Mn2+ + 4 H2O + 5 Cr3+.

Question 8

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 9

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

The answer of Write a balanced net ionic equation for...

Question 10

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

Accepted Answer

The answer of Write a balanced half-reaction for the reduction...

Question 11

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 12

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

Accepted Answer

The answer of Write a balanced half-reaction for the reduction...

Question 13

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

In the reaction, Cr(s) is oxidized to Cr³⁺, meaning it loses electrons and acts as the reducing agent. Sn⁴⁺ is reduced to Sn²⁺, meaning it gains electrons and acts as the oxidizing agent.

Question 14

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 15

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 16

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

In acidic solution, the half-reaction for the reduction of MnO₄^- to Mn²⁺ is:MnO₄^- + 8H⁺ + 5e^- → Mn²⁺ + 4H₂OTherefore, the lowest whole-number coefficient for H⁺ is 8, and it should appear on the reactant side of the balanced equation.

Question 17

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

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

Question 18

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

The answer of Write a balanced chemical equation for the...

Question 19

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

Accepted Answer

In half-cell II, the concentration of Cu2+ decreases as it is reduced to Cu (solid), which causes the concentration of [Cu²⁺] to decrease with time. On the other hand, K+ ions are released from the salt bridge to balance the charge and maintain electrical neutrality, causing the concentration of [K+] to increase with time.

Question 20

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.

Quiz 20: Principles of Chemical Reactivity: Electron Transfer Reactions

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

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

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

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

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)

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

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

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

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

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

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

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 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)

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)

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

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)

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

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

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

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)

Quiz 20: Principles of Chemical Reactivity: Electron Transfer Reactions

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

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

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

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

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)

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

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

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

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

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

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

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 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)

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)

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

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)

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

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

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

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)

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

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

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)

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

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

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

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

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)

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

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)

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