8. As a substance is subjected to pressure and/or temperature changes, it may undergo condensation, deposition, freezing, melting, sublimation, or vaporization. (a) Consider the phase diagram shown below and state the changes that take place upon going from points A to B to C to D. (b) Is the transition from A to B exothermic or endothermic? CHEM 1P92 Assignment 12B. Liquids, Solids, and Intermolecular Forces B Pressure D A Temperature