This video lecture from Reaction Kinetics (F.Sc. first year Chemistry) covers the use of potential energy diagram for the reaction mechanism. Potential energy, which is associated with bonding energy is plotted on the vertical axis and x axis shows the reaction path. The peaks in the potential energy diagram highlight the number of steps involved in the reaction with highest peak (i.e. maximum activation energy), given by the rate determining step. The enthalpy of reaction can also be estimated through the potential energy diagram. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.