Chemistry Atoms First2e
Chemistry Atoms First2e
2nd Edition
ISBN: 9781947172647
Author: OpenStax
Publisher: OpenStax College
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Chapter 16, Problem 1E

Identify each half-reaction below as either oxidation or reduction.

Fe 3 + + 3 e Fe Cr Cr 3 + + 3 e MnO 4 2 MnO 4 + e Li + + e Li

Expert Solution
Check Mark
Interpretation Introduction

(a)

Interpretation:

The following half-reaction should be identified as either oxidation or reduction.

  Fe3++3eFe

Concept Introduction:

The chemical reaction in which a substance loses an electron is known as oxidation reaction. The chemical reaction in which a substance gains an electron is known as reduction reaction.

Answer to Problem 1E

The given half-reaction is a reduction reaction.

Explanation of Solution

The oxidation state of a substance increases in oxidation reaction while the oxidation state decreases in reduction reaction.

In the given half-reaction, the oxidation state of Fe decreases due to addition of electron. Therefore, the reduction of Fe takes place in the given reaction.

Thus, the given half-reaction is a reduction reaction.

Expert Solution
Check Mark
Interpretation Introduction

(b)

Interpretation:

The following half-reaction should be identified as either oxidation or reduction.

  CrCr3++3e

Concept Introduction:

The chemical reaction in which a substance loses an electron is known as oxidation reaction. The chemical reaction in which a substance gains an electron is known as reduction reaction.

Answer to Problem 1E

The given half-reaction is an oxidation reaction.

Explanation of Solution

The oxidation state of a substance increases in oxidation reaction while the oxidation state decreases in reduction reaction.

In the given half-reaction, the oxidation state of Cr increases due to loss of electron. Therefore, the oxidation of Cr takes place in the given reaction.

Thus, the given half-reaction is an oxidation reaction.

Expert Solution
Check Mark
Interpretation Introduction

(c)

Interpretation:

The following half-reaction should be identified as either oxidation or reduction.

  MnO42MnO4+e

Concept Introduction:

The chemical reaction in which a substance loses an electron is known as oxidation reaction. The chemical reaction in which a substance gains an electron is known as reduction reaction.

Answer to Problem 1E

The given half-reaction is an oxidation reaction.

Explanation of Solution

The oxidation state of a substance increases in oxidation reaction while the oxidation state decreases in reduction reaction.

In the given half-reaction, the oxidation state of Mn in MnO42 is +6 while in MnO4 is +7. The oxidation state of Mn increases due to loss of electron. Therefore, the oxidation of Mn takes place in the given reaction.

Thus, the given half-reaction is an oxidation reaction.

Expert Solution
Check Mark
Interpretation Introduction

(d)

Interpretation:

The following half-reaction should be identified as either oxidation or reduction.

  Li++eLi

Concept Introduction:

The chemical reaction in which a substance loses an electron is known as oxidation reaction. The chemical reaction in which a substance gains an electron is known as reduction reaction.

Answer to Problem 1E

The given half-reaction is a reduction reaction.

Explanation of Solution

The oxidation state of a substance increases in oxidation reaction while the oxidation state decreases in reduction reaction.

In the given half-reaction, the oxidation state of Li decreases due to addition of electron. Therefore, the reduction of Li takes place in the given reaction.

Thus, the given half-reaction is a reduction reaction.

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Chapter 16 Solutions

Chemistry Atoms First2e

Ch. 16 - Write cell schematics for the following cell...Ch. 16 - Assuming the schematics below represent galvanic...Ch. 16 - Write a balanced equation for the cell reaction of...Ch. 16 - Balance each reaction below, and write a cell...Ch. 16 - Identify the oxidant and reductant in each...Ch. 16 - From the information provided, use cell notation...Ch. 16 - Why is a salt bridge necessary in galvanic cell...Ch. 16 - An active (metal) electrode was found to gain mass...Ch. 16 - An active (metal) electrode was found to lose mass...Ch. 16 - The masses of three electrodes (A, B, and C), each...Ch. 16 - Calculate the standard cell potential for each...Ch. 16 - Calculate the standard cell potential for each...Ch. 16 - Write the balanced cell reaction for the cell...Ch. 16 - Determine the cell reaction and standard cell...Ch. 16 - Determine the cell reaction and standard cell...Ch. 16 - Write the balanced cell reaction for the cell...Ch. 16 - For each pair of standard cell potential and...Ch. 16 - For each pair of standard free energy change and...Ch. 16 - Determine the standard cell potential and the cell...Ch. 16 - Determine ∆G and ∆G for each of the reactions...Ch. 16 - Use the data in Appendix L to calculate...Ch. 16 - Consider a battery made from one half-cell that...Ch. 16 - Consider a battery with the overall reaction:...Ch. 16 - Why do batteries go dead, but fuel cells do not?Ch. 16 - Use the Nernst equation to explain the drop in...Ch. 16 - Using the information thus far in this chapter,...Ch. 16 - Which member of each pair of metals is more likely...Ch. 16 - Consider the following metals: Ag, Au, Mg, Ni, and...Ch. 16 - Aluminum (EoA13+/A1=-2.07V) is easily oxidized...Ch. 16 - If a sample of iron and a sample of zinc come into...Ch. 16 - Suppose you have three different metals. A, B, and...Ch. 16 - Why would a sacrificial anode made of lithium...Ch. 16 - If a 2.5 A current flows through a circuit for 35...Ch. 16 - For the scenario in the previous question, how...Ch. 16 - Write the half-reactions and cell reaction...Ch. 16 - What mass of each product is produced in each of...Ch. 16 - How long would it take to reduce 1 mole of each of...Ch. 16 - A Current of 2.345 A passes through the Shown in...Ch. 16 - An irregularly shaped metal part made from a...
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