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Rates of Reaction The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. It is measured by the time taken of the reaction¯1. The speed of a reaction can be increased by: 1. Raising the Temperature 2. Adding a Catalyst 3. Increasing the concentration 4. Increasing the Pressure (gases) 5. Increasing Surface Area All of these raise the speed of reaction because of the particle collision theory. Particle Collision Theory For a reaction to occur particles have to collide with each other. Only a small percent result in a reaction. This is due to the energy barrier to overcome. Only particles with enough energy to overcome the barrier will react after colliding. The minimum energy that a particle must have to overcome the barrier is called the activation energy, or Ea. The size of this activation energy is different for different reactions. If the frequency...

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