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Extraction of Metals
Electrolysis of Lead Bromide.
bromide must be heated until it is molten
before it will conduct electricity. Electrolysis
separates the molten ionic compound into its elements.
The reactions at each electrode are called half
The half equations are written so that the same number
of electrons occur in each equation.
Pb2+ + 2e-
metal at the (-)cathode).
2Br- - 2e- Br2 (bromine gas at the (+)anode).
electrons (reduction) to form
Bromide ions lose electrons (oxidation) to form bromine atoms.
The bromine atoms combine to form molecules of bromine gas.
The overall reaction is
PbBr2(l) Pb(s) + Br2(g)
See some other examples of electrolysis.
Links Electrolysis Revision Questions
gcsescience.com The Periodic Table Index Metal Quiz gcsescience.com
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