Collision theory states that reactions occur when particles collide and have enough energy for a successful collision. The rate of reaction depends on the number of effective collisions between particles, with more effective collisions generally leading to a faster reaction, although other factors can also influence the reaction rate.

1. Collision Theory
Reaction takes place when particles collide.
Animation:
http://
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2. Collision Theory
In general, the more collisions, the
faster is the reaction.
However, this is not always true.
Why?
http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gate

3. As we can see … …
Collisions
Successful Unsuccessful
or or
Effective Ineffective

4. Therefore … …
 An effective (successful) collision will occur
if the particles are colliding with sufficient
amount of energy
 The more effective collisions there are, the
faster the reaction.