Why is aluminium extracted by electrolysis rather than by heating aluminium oxide with carbon?
Aluminium is more reactive than carbon, so carbon cannot remove the oxygen
Aluminium oxide melts at a temperature too high for carbon to be used
Aluminium conducts electricity better than carbon does at high temperature
Aluminium oxide is ionic, so carbon cannot form a compound with its ions
40 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.