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What are redox half-reactions?

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John McCann answered

It is either the oxidation or the reduction reaction component.

Example from the standard Galvanic reaction.

Full equation.

Zn(s) + CuSO4(aq) --> ZnSO4(aq) + Cu(s)

Oxidation.

Zn(s) --> Zn^2+ + 2e^-

Reduction.

Cu^2+ + 2e^- --> Cu(s)

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