This lecture covers the second-order kinetics in chemical reactions, focusing on the hyperbolic decrease of reactant concentration over time, the integration of rate laws, and the determination of reaction orders through methods like integral method, half-life determination, and Van't Hoff method. Examples include dimerization reactions and the alkaline hydrolysis of para-nitrosodimethylaniline. The lecture also discusses pseudo-orders of reactions, determination of global and partial reaction orders, and the role of collisions in chemical kinetics.