Chapter 4, Problem 4.95P

(a)

Interpretation Introduction

Interpretation:

The oxidizing agent and the reducing agent in the following reaction are to be determined.

${\text{8H}}^{+}\left(aq\right)+{\text{Cr}}_{\text{2}}{\text{O}}_7^{2-}\left(aq\right)+3{\text{SO}}_3^{2-}\left(aq\right)\to 2{\text{Cr}}^{3+}\left(aq\right)+3{\text{SO}}_4^{2-}\left(g\right)+4{\text{H}}_2\text{O}\left(l\right)$

Concept introduction:

A redox reaction is a type of reaction that involves the change in oxidation number of a molecule, atom or ion changes due to the transfer of an electron from one species to another.

An oxidizing agent is a substance that oxidizes another species and itself gets reduced in a chemical reaction. A reducing agent is the one that reduces another species and itself gets oxidized in a chemical reaction.

(b)

Interpretation Introduction

Interpretation:

The oxidizing agent and the reducing agent in the following reaction are to be determined.

${\text{NO}}_3^{-}\left(aq\right)+4\text{Zn}\left(s\right)+7{\text{OH}}^{-}\left(aq\right)+6{\text{H}}_2\text{O}\left(l\right)\to 4\text{Zn}{\left(\text{OH}\right)}_4^{2-}\left(aq\right)+{\text{NH}}_3\left(aq\right)$

Concept introduction:

A redox reaction is a type of reaction that involves the change in oxidation number of a molecule, atom or ion changes due to the transfer of an electron from one species to another.

An oxidizing agent is a substance that oxidizes another species and itself gets reduced in a chemical reaction. A reducing agent is the one that reduces another species and itself gets oxidized in a chemical reaction.