Question

Define the following terms: (A) collision frequency (B) effective collision and (C) Thersold energy

Answer 1

Fast/instantaneous reactions Chemical reaction which completes in less than Ips (10-12 s) time, IS known as fast reaction. It IS practically impossible to measure the speed of such reactions, e.g., ionic reactions. organic substitution reactions.

Slow reactions Chemical re actions which completes in a long time from some minutes to some years are called slow reactions. e.g., rusting of iron. transformation of diamond etc.

Moderately slow reactions Chemical reactions which are intermediate between slow and fast reactions are called moderately slow reactions.

Rate of Reaction

Rate of a chemical reaction IS the change in the concentration of any one of the reactants or products per unit time. It is expressed in mol L-1 s-1 or Ms-1 or atm time-1 units.

Answer 2

COLLISION FREQUENCY-average rate in which two reactants collide for a given system

EFFECTIVE COLLISON-collision which converts reactants into products

THRESHOLD ENERGY-minimum amount of energy must possessed by the reactant molecules to overcome the energy barrier

hope this help u.........have a great day