Rate of reaction

• What is the formula for mean rate of reaction?


  Quantity of product formed/time taken or quantity of reactant used/ time taken.
• What does the collision theory state?

  Chemical reactions can only take place when the reacting particles collide with each other with sufficient energy.
• What is the rate of a chemical reaction determined by?

  The frequency of successful collisons.
• The rate of reaction is proportional to the concentration
• What happens to the rate of reaction if we increase the surface area?

  Increases.
• What is activation energy?

  Activation energy is the minimum amount of energy required for a chemical reaction to occur.
• The rate of reaction is proportional to the temperature.
• What do catalysts do?

  Increase the rate of reaction without being used up in the reaction.
• Whats an advantage of catalysts?


  They allow us to carry out reactions without needing to increase the temperature saving us money.
• As catalysts aren't used up in a reaction they can be used again and again.
• How do catalysts increase the rate of reaction?

  Catalysts increase the rate of reaction by lowering the activation energy required for the reaction to occur.
• Why don't we include catalysts in the chemical equation for a reaction?

  They are not used in a reaction.
• Different reactions need different catalysts.