Thermodynamics and Chemical Equilibrium introduces physical chemistry by developing the principles of chemical equilibrium from the perspectives of chemical kinetics, classical thermodynamics, and statistical thermodynamics. The central objective is to develop the ideas that are necessary to produce the equilibrium-constant expression from each of these perspectives. The emphasis is on the basic ideas that underlie these subjects. The presentation assumes familiarity with the calculus and the basics of chemistry and physics. The author earned a B.A. from Carleton College and a Ph.D. in physical chemistry from Northwestern University. He taught for several years at the University of California at Riverside, and then spent many years in industrial research and industrial research management. Following his retirement, he presented a college-level physical chemistry course for several years at The Oklahoma School of Science and Mathematics.