Master Topic C5 of OCR Gateway Combined Science A (J250): rates of reaction and collision theory, the factors affecting rate, measuring and calculating rates, catalysts and enzymes, and reversible reactions and dynamic equilibrium. Worked calculations, required-practical methods, exam tips and Mid/Stronger/Top-band model answers for the Foundation and Higher tiers. (Titration calculations, percentage yield, atom economy and gas-volume calculations are separate-science only and are not covered.)
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