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Extraction of Metals
Electrolysis of Zinc Chloride.
can be extracted from
zinc oxide by heating with
or from zinc chloride by electrolysis.
chloride must be
heated until it is molten
before it will conduct electricity. Electrolysis
separates the molten ionic compound into its elements.
The half equations are
Zn2+ + 2e-
metal at the (-)cathode).
2Cl- - 2e- Cl2 (chlorine gas at the (+)anode).
electrons (reduction) to form
Chloride ions lose electrons (oxidation) to form chlorine atoms.
The chlorine atoms combine to form molecules of chlorine gas.
The overall reaction is
ZnCl2(l) Zn(s) + Cl2(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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