Chapter 14, Problem 43QP

The nickel-cadmium battery is used in portable appliances and power tools Unbalanced half-reactions that occur in this battery are

$\begin{array}{l}\text{ Cd}\left(s\right)+{\text{2OH}}^{-}\left(aq\right)\to \text{Cd}{\left(\text{OH}\right)}_{\text{2}}\left(s\right)\\ {\text{NiO}}_{\text{2}}\left(s\right)+{\text{2H}}_{\text{2}}\text{O}\left(l\right)\to \text{Ni}{\left(\text{OH}\right)}_{\text{2}}\left(s\right)+{\text{2OH}}^{-}\left(aq\right)\end{array}$

Which equation represents the oxidation half-reaction? Which represents the reduction half-reaction? Add electrons to the appropriate side of each equation to account for the chance in oxidation number.