Physical Chemistry, Reason and Experiment, is a textbook designed for undergraduate students of physical chemistry. Theory and experiment are woven together into a single resource especially well suited for faculty teaching both the lecture and lab courses in physical chemistry and for the students enrolled in both courses. Readers progress logically along a framework of atomic and molecular quantum mechanics through statistical mechanics into thermodynamics. The theoretical and mathematical beauty of the framework is manifest in experimental observations of molecular symmetry, spectroscopy, kinetics, phase equilibria, and electrochemistry providing a rich basis for growth toward graduate study.