summary of electrochemistry

a summary of the key points needed for As chemistry on electrochemistry

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Oxidation is loss of electrons (OIL) reduction is
gain of electrons (RIG) this can be remembered
as OILRIG.
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
cathode.
Electrons from the external circuit are used in
the discharge of positive ions at the cathode.
E.g.
Cu2+(aq)+2e- Cu(s)
Reduction takes place at the cathode

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Electrons are released to the external circuit at
the anode, e.g.
CL-(aq) ½Cl2(g)+ e-
Or
Cu(s) Cu2+ + 2e-
Oxidation therefore takes place at the anode.…read more

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