Collision theory

• Factors that affect the rate of a chemical reaction

  • Temperature
  • Concentration (or pressure for gas)
  • Surface area (for solids)
• Articles must collide with enough energy in order to react
• Collision theory

  • The collision frequency of reacting particles (how often they collide)
  • The energy transferred during a collision. Particles have to collide with enough energy for the collision to be successful
• More successful collisions


  Higher the rate of reaction
• Increasing the concentration (or pressure)


  Increases the rate of reaction
• Not every collision results in a reaction (otherwise known as the 'activation energy')