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The Order of a Reaction

OCR A-level ChemistryRate of ReactionLesson 5 of 11

The order of a reaction with respect to a reactant is the power to which the concentration of the reactant is raised in the rate equation.

If the order is zero with respect to a reactant then the rate is unaffected by a change in the concentration of that reactant.

Diagram

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Key terms in this lesson

rate equation
An equation that shows how the rate of a reaction depends on the concentration of each reactant, each raised to a power called its order.

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