Master Topic C3 of OCR Gateway Science A GCSE Chemistry (J248): conservation of mass and balanced equations, the mole and reacting masses, exothermic and endothermic reactions, reaction profiles and activation energy, oxidation and reduction, acids, bases and the pH scale, the reactions of acids and making salts, and electrolysis. Worked calculations, required-practical method steps, exam tips and graded model answers for Foundation and Higher tiers.
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