C2(ii) - Rates of Reaction 4.

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Collision Theory.

Reactions rates are explained perfectly be collision theory. It's really simple. It just says that the rate of a reaction simply depends on how often and how hard the reacting particles collide with each other. The basic idea is that particles have to collide in order to react, and they have to collide hard enough (with enough energy).

More Collisions Increase the Rate of Reaction.

All four methods of increasing rate of reactions can be explained in terms of increasing the number of successful collisions between the reacting particles:

1) HIGHER TEMPERATURE increases collisions.

When the temperature is increased the particles all move quicker. If they're moving quicker, they're going to have more collisions.

2) HIGHER CONCENTRATION (or PRESSURE) increases collisions.

If a solution is made more concentrated it means there are…


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