# Explain what happens at each electrode when molten lead bromide is electrolysed using inert electrodes.

> Edexcel GCSE Chemistry (1CH0) — 3.2 Electrolytic processes · Explain · 4 marks

> Lead bromide is an ionic compound. When solid, it does not conduct electricity. When melted, it can be electrolysed.

## Mark scheme (4 marks)

1. The cathode is the negative electrode where lead ions (Pb²⁺) are attracted
2. At the cathode, lead ions gain electrons (reduction) to form lead metal
3. The anode is the positive electrode where bromide ions (Br⁻) are attracted
4. At the anode, bromide ions lose electrons (oxidation) to form bromine gas

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