For 10 points, name this class of reactions which involve a change in oxidation number, named for the fact that they consist of reduction and oxidation.
Free radicals act as messengers in the namesake "signaling" of these reactions. Disproportionation (DIS-pro-por-shun-AY-shun) reactions occur when different atoms of the same element undergo both half-reactions of this class of reactions. The two half-reactions which make up these reactions take place in the two half-cells of an electrochemical (ee-LECK-tro-KEM-ih-kul) cell. For 10 points, name this class of reactions which involve a change in oxidation number, named for the fact that they consist of reduction and oxidation.
Free radicals act as messengers in the namesake "signaling" of these reactions.
{redox} reactions [or {oxidation}-{reduction} reactions before "{reduction}"; or {reduction}-{oxidation}