GCSE Combined Science (AQA)

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Collision Theory

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Organisation Animal Tissues, Organs and Organ Systems

Collision Theory

1:54 Collision Theory and Rate of Reaction
Spec 4.2.2.1
Previous Lipids & Lipases Next Enzymes & Temperature
  • Different models can be used to describe enzyme action.
  • Lock and key theory is commonly used to explain enzyme action.
  • Collision theory is another model that explains enzyme action.
  • Collision theory states that for a reaction to occur, the enzyme's active site must successfully collide with its substrate.
  • No reaction occurs if there is no collision between the enzyme's active site and the substrate.
  • The number of successful collisions affects the level of enzyme activity.
  • Factors influencing the number of collisions include temperature and enzyme concentration.
  • As temperature increases, enzymes and substrates move more, leading to more frequent collisions.
  • Increased temperature results in molecules having more kinetic energy, thus colliding more often.
  • Higher temperatures can increase the rate of enzyme-controlled reactions.
  • Increasing the concentration of enzymes also increases the chances of successful collisions.
  • Higher enzyme concentration leads to more frequent and successful collisions.

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