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What is the difference between an oxidation-reduction reaction and a half-reaction?
Oxidation-reductions reactions always have an electron transfer from the oxidized species to the reduced species. When the oxidized species is separated from the reduced species, a balanced reaction can be written for each process (oxidation or reduction) that is called a half-reaction. All half-reactions must have electrons either as reactants (for reduction half-reactions) or products (for oxidation half-reactions).