Reaction Rates


Collison theory

Collision theory explains how reactions occur and why they occur at different rates.

The minimum requirements for a reaction to happen are the following : particles must collide, the energy of particles must exceed the activation energy.

We can increase the rate of reaction by increasing number of collisions and/or the energy of reactant particles.

We can do this by changing the four main factors:

  • Temperature
  • Pressure ( for gases)
  • Surface area
  • Concentration

Plotting Reaction Rates

The rate of reaction can be analysed by plotting a graph.

The gradient of the line is equal to the rate of reaction:

  • The steeper the line, the greater the rate of reaction
  • rate of…


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