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The Rate of Reaction

OCR AS-level ChemistryReaction RatesLesson 1 of 10

The rate of a reaction is measured by the change in concentration over time. The rate of reaction is how fast the reactants are being used up or how fast a product is formed. The rate of reaction is fastest at the start of a reaction then decreases at the reactants are used up and their concentrations fall. Once all the reactant are used up the reaction ends and the rate is equal to zero.

Diagram

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