Define collision frequency. Write short note on collision theory of chemical reactions.

Explanation

According to this theory, the reactant molecules are assumed to be hard spheres and reaction is supposed to occur when molecules collide with each other. The number of collisions per second per unit volume of the reaction mixture is known as collision frequency (Z). The collisions in which molecules collide with sufficient kinetic energy, called threshold energy, and proper orientation so as to make it easy for reacting species to break bonds and form new bonds, are called as effective collisions. If the reacting species, at the time of collision do not have proper orientation they simply bounce back and no product is formed even if they have sufficient kinetic energy collision theory has certain drawbacks. It assumes atoms/molecules to be hard spheres and ignores.their actual structure.