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Factors Affecting Reaction Rates

Different chemical reactions go at different rates.

Studying reaction kinetics helps chemists to find ways of speeding up or slowing down
chemical processes in industry. It also helps them to make predictions about important
reactions such as those that occur between gases in the atmosphere, and…

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The Collision Theory of Reactants
We can explain the effect of these factors using a simple collision theory.

The basic idea is that reactions occur when the particles of reactants collide, provided
they collide with a certain minimum kinetic energy.




For example:
Two particles, an ozone molecule and a chlorine…

Page 3

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Enthalpy Profiles




Plots, as shown above, are a useful way of picturing the energy changes that take place as a
reaction proceeds.

The curved line is the energy pathway for a pair of colliding molecules ­ it is called the
energy (or enthalpy) profile for the reaction.

In going from…

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