During the industrial extraction of aluminium, molten aluminium oxide is electrolysed. At the cathode, aluminium ions, Al3+\text{Al}^{3+}Al3+, form neutral aluminium atoms.
Write the half equation for this reaction.
83 exam-style questions on Edexcel GCSE Chemistry 4.2 Electrolytic processes, covering 4.2.1 Electrolytes and the process of electrolysis, 4.2.2 Products of electrolysis using inert electrodes, 4.2.3 Half equations, oxidation and reduction in electrolysis, and 4.2.4 Electrolysis of copper sulfate and purifying copper. Each one has a worked solution and a mark scheme showing where the marks go.