Chapter 4, Problem 4.81QP

Interpretation Introduction

Interpretation:

Whether the given ${\text{Cr}}_{\text{(s)}}\stackrel{}{\to }{\text{ Cr}}^{3+}{}_{\text{(aq)}}{\text{ +3e}}^{-}$ equation represents oxidation reaction or reduction reaction has to be given. Also what is occuring in the reaction has to be described.

Concept Introduction:

Oxidation-Reduction reactions:

The transfer of negative charge (one or more electrons) from one reactant to other reactant results in oxidation-reduction reactions.  When a subtance/species lose electrons during a reaction, then it is a oxidation reaction.  When a subtance/species gain electrons during a reaction, then it is a reduction reaction.

Oxidation reaction and reduction reaction are complementary reactions and are called as redox reactions.