(HT only) Explain that reduction happens at the cathode because positive ions gain electrons.

In the subtopic Representation of reactions at electrodes as half equations (HT only), this learning objective focuses on (HT only) Explain that reduction happens at the cathode because positive ions gain electrons. It sits within Electrolysis for AQA GCSE Chemistry 8462 Unit 4.4, so the explanation must stay anchored to chemical changes rather than drifting into a general chemistry idea. Approved keywords to use include HT only, cathode, reduction, electron, ion. Reduction. means the gain of electrons by an ion or molecule, occurring at the cathode in electrolysis Avoid the mistake of students often confuse reduction with oxidation and incorrectly state that positive ions lose electrons at the cathode; instead, remember that reduction involves the gain of electrons. At the cathode, positive ions gain electrons, leading to a decrease in their charge For exam answers, remember that reduction occurs at the cathode where positive ions gain electrons during electrolysis Keep acid, alkali and base distinct; keep oxidation and reduction distinct; do not mix reduction with displacement; keep electrolysis separate from electroplating; distinguish anode from cathode, positive ions from negative ions, oxidation state from ionic charge, and strong acid from concentrated acid.