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Oxidation is loss of electrons (OIL) reduction is
gain of electrons (RIG) this can be remembered

Electrolysis only occurs in molten liquids and
solutions. In an electrolytic cell the anode is
positive and the cathode is negative. Anions
migrate to the anode and cations migrate to the

Page 2

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Electrons are released to the external circuit at
the anode, e.g.

CL-(aq) ½Cl2(g)+ e-
Cu(s) Cu2+ + 2e-
Oxidation therefore takes place at the anode.


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