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What are the four stages in electrolysis?

-Electrical circuit has 2 electrodes (often made of inert substance that doesn’t react with the products) that make contact with the electrolyte.

-Ions in electrolyte move to electrodes where they’re discharged to produce elements

-Positively charged ions attracted to neg electrode where they form metal or hydrogen
depending on ions in electrode.

-Neg ions attracted to pos electrode where they lose their charge to form non-metallic elements.
i.e. when molten lead bromide is electrolysed: -lead produced at neg electrode, bromine at pos.

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Describe the process of electroplating?

The object to be plated is used as the negative electrode.

The positive electrode is made from the plating metal. Electrolyte =solution containing ions of the plating metal.

At positive electrode: atoms of the plating metal lose electrons to form metal ions which go into the solution.

At negative electrode: metal ions from the solution gain electrons to form metal atoms which are deposited on the object to be plated

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