GCSE Combined Science (AQA)

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Collision Theory & Reaction Rate

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The rate and extent of chemical change Rate of reaction

Collision Theory & Reaction Rate

3:47 Factors Affecting Rate of Reaction
Spec 4.6.1.2 4.6.1.3
Previous Calculating Rate from Graphs Next Surface Area & Rate
  • In chemical reactions, three main factors can be changed: concentration or pressure of reactions, temperature, and surface area of solid reactants.
  • These factors affect the rate of reaction.
  • Collision theory states that chemical reactions occur when reactant particles collide with sufficient energy.
  • The minimum energy required for particles to react is called activation energy.
  • Not all collisions result in a reaction; only those with energy equal to or above the activation energy do.
  • Reaction rates can be increased by increasing the number of collisions or the energy of the particles.
  • More successful collisions lead to a higher reaction rate.
  • Understanding collision theory helps in determining how to change conditions to affect reaction rates.

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