Physical Chemistry is a groundbreaking new text that explains core topics in depth with a focus on basic principles, applications, and modern research. The authors hone in on key concepts and cover them thoroughly and in detail as opposed to the general, encyclopedic approach competing textbooks take. Excessive math formalism is avoided to keep students focused on the most important concepts and to provide greater clarity. Applications woven throughout each chapter demonstrate to students how chemical theories are used to solve real-world chemical problems in biology, environmental science, and material science. Extensive coverage of modern research and new developments in the field get students excited about this dynamic branch of science. The text has been designed in such a way that it can be used for either "Quantum first" or "Thermo first" courses. The combined text is arranged for a traditional "Thermo first" course; the split texts are organized to facilitate "Quantum first" courses.