Lattice energy A measure of the energy contained in the crystal lattice of a compound,equal to the energy that would be released if the component ions were brought together from infinity.
HYDRATION ENERGY :-
THE AMOUNT OF ENERGY RELEASED DURING DISSOLUTION OF ONE MOLE OF COMPOUND INTO WATER IS CALLED HYDRATION ENERGY.
IF HYDRATION ENERGY IS GREATER THAN LATTICE ENERGY ,THEN COMPOUND IS SOLUBLE IN WATER AND IF HYDRATION ENERGY IS LESS THAN LATTICE ENERGY ,THEN COMPOUND INSOLUBLE IN WATER. These in chapter solution
Collisional Frequency is the average rate in which two reactants collide for a given system and is used to express the average number of collisions per unit of time in a defined system.
mean free path
the average distance travelled by a gas molecule or other particle between collisions with other particles.
These in chapter chemical kinetics