collision theory

• What does collision theory state about chemical reactions?

  Reactions only occur when reacting particles collide with sufficient energy
• What is activation energy?

  Minimum amount of energy required for particles to react
• What are the four important factors affecting the rate of reaction?


  1. Concentration of reactants
  2. Pressure of reacting gases
  3. Surface area of solid reactants
  4. Temperature
• How does increasing the concentration of reactants affect the rate of reaction?

  It increases collision frequency and reaction rate
• Why does higher concentration lead to more successful collisions?

  Particles are closer together and collide more often
• How does increasing the pressure of reacting gases affect the rate of reaction?


  It increases collision frequency and reaction rate
• What happens to the number of particles when pressure is increased?

  More particles are in a smaller volume
• How does increasing the surface area of solid reactants affect the rate of reaction?

  It increases collision frequency and reaction rate
• Why do smaller pieces of solid reactants react faster?


  They have a larger surface area compared to volume
• How does increasing temperature affect the rate of reaction?


  It increases collision frequency and energy
• What occurs in a hot reaction mixture regarding particle movement?


  Particles move more quickly and collide more often with greater energy
• What is the result of more energetic collisions in a reaction?


  More collisions are successful