Chapter 15, Problem 33RE

REFLECT AND APPLY The following half reactions play important roles in metabolism.

$\begin{array}{l}{}^1{/}_2{\text{O}}_2+2{\text{H}}^{+}+2e^{-}\to {\text{H}}_{\text{2}}\text{O}\\ \text{NADH}+{\text{H}}^{+}\to {\text{NAD}}^{+}+2{\text{H}}^{+}+2e^{-}\end{array}$

Which of these two is a half reaction of oxidation? Which one is a half reaction of reduction? Write the equation for the overall re- action. Which reagent is the oxidizing agent (electron acceptor)? Which reagent is the reducing agent (electron donor)?