Rates of Reaction

What is 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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