GCSE Chemistry (AQA)

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Concentration, Pressure & Rate

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The rate and extent of chemical change Rate of reaction

Concentration, Pressure & Rate

3:42 Factors Affecting Rate of Reaction
Spec 4.6.1.2 4.6.1.3
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  • Increasing concentration of reactants in solution or pressure of reacting gases increases the rate of reaction.
  • Reaction rate measures how quickly reactants are used up or products are made.
  • Graphs can track reaction rates, with time on the x-axis and product amount on the y-axis.
  • Higher concentration or pressure results in a steeper graph, indicating a higher rate of reaction.
  • Lower concentration or pressure results in a shallower curve, indicating a lower rate of reaction.
  • Increasing concentration or pressure results in more reactant particles in a given area.
  • More reactant particles increase the frequency of collisions.
  • Collision theory states particles must collide to react.
  • More particles in the same volume increase the likelihood of collisions.
  • Increased collisions lead to more frequent successful reactions.
  • Higher concentration or pressure results in more successful collisions overall, increasing the reaction rate.

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