CAIE A Level Chemistry 9701 · Electrochemistry
Compare the products formed at the electrodes when molten aluminium oxide is electrolysed with the products formed when aqueous aluminium sulfate is electrolysed. In your answer, refer to the ions present and the electrode reactions that occur in each case.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.