half-reaction


half-reaction
A portion of an oxidation-reduction reactionA reaction in which one reactant is oxidized (loses electrons) and one reactant is reduced (gains electrons), also called "redox reaction." involving only oxidationThat part of a chemical reaction in which a reactant loses electrons; simultaneous reduction of a reactant must occur. or only reduction. An oxidation half-reactionA portion of an oxidation-reduction reaction involving only oxidation or only reduction. An oxidation half-reaction can be combined with a reduction half-reaction to give an overall equation; this is useful in balancing oxidation-reduction reactions. Each half-reaction can be assigned its own standard reduction potential; cell potentials can be calculated by combining these half-reaction potentials. can be combined with a reduction half-reaction to give an overall equation; this is useful in balancing oxidation-reduction reactions. Each half-reaction can be assigned its own standard reduction potentialThe voltage attributed to a reduction half-reaction under standard conditions; its value is given referenced to the standard hydrogen electrode. Also called standard electrode potential.; cell potentials can be calculated by combining these half-reaction potentials.