Headings Search Questions 
Collision Theory.
Collision theory says
that a chemical reaction can
only occur
between particles when they
collide (hit each other).
Particles may be atoms, ions
or molecules.
There is a minimum amount of energy
which colliding particles need in
order to react with each other.
If the colliding particles have less
than this minimum energy
then they just bounce off each other
and no reaction occurs.
This minimum energy is called the activation energy.
The faster the particles
are going, the more energy they
have.
Fast moving particles are more
likely to react when they collide.
You can make particles move
more quickly by heating them up
(raising
the temperature).
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