The first text to cover both molecular reaction dynamics and chemical kinetics and their respective theories in a single source. After introductory material, the monograph goes on to cover interaction potentials; relative motion and the collisional approach for chemical reaction in the gas phase; partition functions; transition state theory; unimolecualr reactions; molecular reactions calculations; non-adiabatic transitions; surface kinetics; chemical reactions in solution; energetic changes in solvating a molecule; transition state theory in solution; models for diffusion; Kramers' theory of viscosity of solvent in chemical reactions; and electronic transfer reactions in solution. Also includes problems and solved exercises.