Chapter 8.4, Problem 25PP

(a)

Interpretation Introduction

Interpretation: Identify the following as an oxidation or a reduction:

  ${\text{Na}}^{\text{+}}\left(\text{aq}\right){\text{ + e}}^{\text{-}}\to \text{Na}\left(\text{s}\right)$

Concept Introduction: Oxidation is the gain of electrons and reduction is the loss of electrons.

(b)

Interpretation Introduction

Interpretation: Identify the following as an oxidation or a reduction:

  $\text{Ni}\left(\text{s}\right)\to {\text{Ni}}^{\text{2+}}\left(\text{aq}\right){\text{ + 2e}}^{\text{-}}$

Concept Introduction: Oxidation is the gain of electrons and reduction is the loss of electrons.

(c)

Interpretation Introduction

Interpretation: Identify the following as an oxidation or a reduction:

  ${\text{Cr}}^{\text{3+}}\left(\text{aq}\right){\text{ + 3e}}^{\text{-}}\to \text{Cr}\left(\text{s}\right)$

Concept Introduction: Oxidation is the gain of electrons and reduction is the loss of electrons.

(d)

Interpretation Introduction

Interpretation: Identify the following as an oxidation or a reduction:

  ${\text{2H}}^{\text{+}}\left(\text{aq}\right){\text{ + e}}^{\text{-}}\to {\text{H}}_{\text{2}}\left(\text{g}\right)$

Concept Introduction: Oxidation is the gain of electrons and reduction is the loss of electrons.