Collision Theory

Chemical reactions only occur when reacting particles collide with each other with sufficent energy.

Activation energy is the minimum amount of energy required to create a chemical reaction

4 factors that effect the rate of reaction ; Temperature,Surface area , Concentration and catalysts.

Temperature //
-In a hot reaction mixture the particles move more quickly therefore they collide more regularly with greater energy, more collisions are successful

Concentration//
-At higher concentration, the particles are crowded closer together therefore they collide more often and there are more successful collisions
-Increasing the pressure of the reacting gasses also increases the frequency of collisions
( Required Practical)

Surface area //
-Small pieces of solid reactant have a large surface area in relation to their volume

• More particles are exposed and available for collisions , so there are more collisions and a faster reaction