The table gives information about a cell used to electrolyse molten sodium iodide.
Molten sodium iodide contains Na+\text{Na}^+Na+ ions and I−\text{I}^-I− ions.
| Electrode | Connection to the direct current supply |
|---|---|
| Graphite electrode P | Negative terminal |
| Graphite electrode Q | Positive terminal |
State the product formed at each electrode.
Explain how the ions in molten sodium iodide form the products at electrodes P and Q.
76 exam-style questions on AQA GCSE Chemistry 4.3 Electrolysis, covering 4.3.1a The process of electrolysis, 4.3.1b Half equations in electrolysis, 4.3.2 Electrolysis of molten ionic compounds, 4.3.3 Using electrolysis to extract metals, 4.3.4 Electrolysis of aqueous solutions, and 4.3.5 Representation of reactions at electrodes as half equations. Each one has a worked solution and a mark scheme showing where the marks go.