BRAINCAKEThe Rate of Reaction
The rate of reaction is the change in the amount or concentration of a reactant or product per unit time.
rate = change in concentration ÷ time taken
When concentration is in mol dm-3 and time is in seconds, the units of rate are mol dm-3 s-1. Other units are used when a different quantity is followed, for example cm3 s-1 for a volume of gas or g s-1 for a loss in mass.
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Key terms in this lesson
- colorimeter
- An instrument that measures the intensity of colour in a solution, used to follow the concentration of a coloured species over time.
More in Reaction Rates
- Collision Theory
- Activation Energy
- Steric Hindrance
- Effect of Concentration
- Effect of Pressure
- Effect of Surface Area
- Maxwell-Boltzmann Distribution Curve
- Effect of Temperature
All 12 lessons in Reaction Rates · All Edexcel AS-level Chemistry topics