Physical Chemistry app provide the information, explanation, and guidance you need to master the subject. The content divided into three parts: Part 1: of the app develops the concepts that are needed for the discussion of equilibria in chemistry. Equilibria include physical change, such as fusion and vaporization, and chemical change, including electrochemistry. The discussion is in terms of thermodynamics, and particularly in terms of enthalpy and entropy. We see that we can obtain a unified v