The Order of a Reaction
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.

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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.
More in Rate of Reaction
- The Rate of a Reaction
- Measuring Reaction Rates
- Experimental Determination of the Rate of Reaction
- The Rate Equation
- The Rate Constant k
- Worked Example
- Half-Lives and Reaction Rate Graphs
- The Rate Determining Step
All 11 lessons in Rate of Reaction · All OCR A-level Chemistry topics