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Half equations



Loss of electrons



Gain of electrons

They show just part of a reaction, from the point of view of one of the
substances present.
They are easily recognisable because they always have an electron (e-) in
Eg. Na Na+ + e- (oxidation…

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+ Cations are attracted to the cathode

- Anions are attracted to the anode

Electrolysis of lead (II) bromide

When the lead bromide is solid, nothing happens.
When the lead bromide melts:
o The bulb lights up, showing that an electric current is flowing.
o Brown bubbles are seen around…

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Electrolysis of dilute sulphuric acid:

At the cathode : 2H+ + 2e- H2

At the anode: 4OH- 2H2O + O2 + 4e-

For every 4 electrons that flow round the circuit, 1 mole of oxygen is produces
by 2 moles of hydrogen.

Therefore twice the volume of hydrogen.

Electrolysis calculations…


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