Important Definitions:

Active Molecules:

  • Those molecules which attain the minimum energy required for a chemical reaction.

Activation Energy:

  • Minimum amount of energy required by a reactant molecule to participate in a reaction is called Activation energy.

Threshold Energy:

  • Minimum amount of energy which must be associated with the molecules so that their collision results into product formation.
  • Threshold energy = Activation energy + Energy Possessed by molecules.


Collision Frequency:

The number of collisions taking place per second per unit volume of the        reaction mixture is known as Collision Frequency Z.
Incase of binary collision Z = 1025   to   1028.

According to collision theory

  • Reacting species must possess the adequate energy to overcome the energy barrier
  • Reacting species must be properly oriented at the time of collision.
  • Reactant → Activated Complex → Product
  • The molecule which have sufficient activation energy from activated complex which decompose in product.
  • Orientation of molecule:-


« Click Here for Previous Topic Click Here for Next Topic »

Class 12 Chemistry Chemical Kinetics All Topics Notes CBSE Class 12 Chemistry All Chapters Notes

You wish to report grammatical or factual errors within our online articles, you can let us know using the article feedback form.