Molten calcium bromide, CaBr2\text{CaBr}_2CaBr2, is electrolysed using inert electrodes. A student says, "The reaction at the positive electrode is not oxidation because bromide ions are negative."
Explain why the student's statement is wrong.
Write a half equation for the reaction at the positive electrode.
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.