Collision theory - higher tier

For a chemical reaction to occur, the reactant particles must collide with each other.

Two pairs of particles move towards each other

1. Two pairs of particles move towards each other

However, a collision with too little energy will not produce a reaction. The colliding particles must have enough energy for the collision to be successful or effective in producing a reaction.

The minimum amount of energy for a collision to be successful is called the activation energy.

The rate of a reaction depends on the rate of successful collisions between reactant particles. The more successful collisions there are, the faster the rate of reaction.

Two pairs of particles move towards each other

1. Two pairs of particles move towards each other.