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Collision Theory Collisions needed to provide energy required for a particle to change (i.e. a bond to break) and to bring the reactants into contact Reaction Rate Reaction needs sufficient kinetic energy Minimum energy is activation energy In order to react, particles must… Collide with each other With sufficient energy In the correct geometrical alignment (steric factor) Effect of concentration Increasing the concentration will….. The same effect is seen with pressure for gases Effect of surface area Which will react faster, powder or lumps ? What must be kept the same if we are doing an investigation into this ? Effect of Temperature Why does increasing the temperature increase the rate ? Maxwell- Boltzmann Distribution Maxwell Boltzmann Distribution Activation energy important Effect of catalyst Effect of light Excitation of reactants or breaking of bonds e.g. Silver halides Orientation Geometry of reaction can be important