GCSE Combined Science

At the cathode (−): hydrogen is produced if the metal is more reactive than hydrogen . Otherwise the metal is produced (copper, silver).
At the anode (+): oxygen is produced unless the solution contains halide ions (Cl⁻, Br⁻, I⁻), when the halogen is produced.

AQA Combined Science: Trilogy (8464). Biology, Chemistry and Physics in one course. Reused science lessons are selected for Trilogy, with a new six-paper practice set for each tier.