4.2+Collision+Theory

The rate of reaction is affected by four things:
 * Temperature
 * Concentration or Pressure
 * Surface Area
 * Pressence of a Catalyst

A reaction can only take palce when the two or more reactants collide with enough energy to start the reaction off. The smallest amount of energy they must have to react is called the activation energy. If you icrease the amount of energy something has then there is more of a chance that they will collide.

Surface Area can make a big difference, for example if you are lighting a fire and you use smaller logs to start off with there is more wood to react with the air maknig it easier to light the fire.

To the right as you can see there is a picture that is a whole cube and the particles on the outside can only hit the outside. (This picture is very arousing)

As you can see on this picture the reaction will be faster because the particles can hit the inside as well so there is more to hit. (This picture might not be as arousing because the blocks are smaller)

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