OCR GCSE Combined Science A · J250
Specification C1 · Biology Paper 1, Biology Paper 2, Chemistry Paper 1, Chemistry Paper 2, Physics Paper 1, Physics Paper 2
Revise: ElectrolysisA useful school investigation is the electrolysis of brine, a sodium chloride solution. A clamped U-shaped test tube keeps the regions around the two electrodes apart, making local changes easier to see. Two carbon, or graphite, electrodes conduct electricity and act as inert electrodes: they do not take part in the intended reaction.