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3.3 Elements of the Sea

Electrolysis as Redox Reactions
When electricity is passed through molten or aqueous compounds (only these as they contain free
electrons) the compound is broken down by electrolysis
Molten compounds
If ionic compounds are melted their charged ions become free to move and carry a

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Electrolysis of Water
Water takes part in electrolysis also so it can be hard to predict the products at the
Reaction at anode (oxidation) :

4OH 2H2O + O
2 + 4e

Reaction at cathode (reduction) :

2H+ +2e H2

Electrolysis products of group 1, 2 and Al compounds…


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