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Exam 14: Oxidation-Reduction Reactions

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Question 21

Multiple Choice

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What is the oxidation number of carbon in carbon monoxide, CO?

A) -2
B) +2
C) +6
D) +4

E) B) and D)
F) All of the above

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Question 22

Multiple Choice

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Given the accompanying partial activity series, predict which element or ion will react with cobalt, Co. Zn  Zn²⁺ + 2e^- Fe  Fe²⁺ + 2e^- Co  Co²⁺ + 2e^- Ni  Ni²⁺ + 2e^- Cu  Cu²⁺ + 2e^-

A) Zn
B) Fe²⁺
C) Ni
D) Cu²⁺

E) B) and D)
F) B) and C)

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Question 23

Multiple Choice

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Knowing that sodium and potassium react violently with water, predict which element will also react with water.

Which pair of half-reactions takes place in a fuel cell?

In the context of chemical reactions, oxidation refers to the:

If the accompanying drawing of an electrochemical cell represents an iron-nickel cell, use the partial activity series included to identify the components labeled 1, 2, 3, and 4 respectively. Zn  Zn²⁺ + 2e^- Fe  Fe²⁺ + 2e^- Co  Co²⁺ + 2e^- Ni Ni²⁺ + 2e^- Cu  Cu²⁺ + 2e^-

The oxidation half-reaction for the reaction of zinc with hydrochloric acid is:

Write the balanced net ionic equation for the reaction consisting of the two half-reactions given. Cu  Cu²⁺ + 2e^- Au³⁺ + 3e^-  Au

Using the accompanying drawing of an electrochemical cell, identify the components labeled 1, 2, and 5, respectively.

Use the partial activity series included to determine which reaction will NOT occur spontaneously. Zn  Zn²⁺ + 2e^- Fe  Fe²⁺ + 2e^- Co  Co²⁺ + 2e^- Ni  Ni²⁺ + 2e^- Cu  Cu²⁺ + 2e^-

What is the oxidation number of sulfur in sulfur trioxide, SO₃?

Which pair of half-reactions could be used to electroplate silver onto iron?

Consider an electrochemical cell consisting of zinc and cobalt half-cells. Use the partial activity series included to determine the direction in which the electrons in the wire will flow. Zn  Zn²⁺ + 2e^- Fe  Fe²⁺ + 2e^- Co  Co²⁺ + 2e^- Ni  Ni²⁺ + 2e^- Cu  Cu²⁺ + 2e^-

Given the accompanying partial activity series, which element(s) can reduce copper(II) to elemental copper? Zn  Zn²⁺ + 2e^- Fe  Fe²⁺ + 2e^- Co  Co²⁺ + 2e^- Ni  Ni²⁺ + 2e^- Cu  Cu²⁺ + 2e^-

Given the accompanying partial activity series, which element(s) will NOT react with acid? Zn  Zn²⁺ + 2e^- Fe  Fe²⁺ + 2e^- Ni  Ni²⁺ + 2e^- H₂  2H⁺ + 2e^- Cu  Cu²⁺ + 2e^- Ag  Ag⁺ + e^-

Which example does NOT illustrate a redox reaction?

What are the coefficients of the balanced equation that represents the reaction in a magnesium/iron electrochemical cell? Mg (s) + Fe²⁺ (aq)  Fe (s) + Mg²⁺ (aq)

What is the oxidation number of sulfur in the sulfite ion, SO₃^2-?

If the accompanying drawing of an electrochemical cell represents an iron-nickel cell, use the partial activity series included to select the half-reaction represented by the LEFT side of the cell. Zn  Zn²⁺ + 2e^- Fe  Fe²⁺ + 2e^- Co  Co²⁺ + 2e^- Ni  Ni²⁺ + 2e^- Cu  Cu²⁺ + 2e^-

What are the coefficients of the balanced equation that represents the reaction in a magnesium/aluminum electrochemical cell? Mg (s) + Al³⁺ (aq)  Al (s) + Mg²⁺ (aq)