Chemical reactions vary in speed. The rate of reaction measures how much product is made in a given time. For reactions to occur, reactant particles must collide.
For a chemical reaction to occur, the reactant particles must collide with each other.
1. Two pairs of particles move towards each other
2. The pairs collide and reform so that each member of the original pair joins with a member of the other pair, forming two new pairs
3. The new pairs are now moving away from each other