PDF SECTION 17.1 THE FLOW OF ENERGY HEAT AND WORK (pages 505-510) SECTION 17.2 MEASURING AND EXPRESSING ENTHALPY CHANGES (pages 511-517) This section explains how to construct equations and perform calculations that show enthalpy changes for chemical and physical processes. Calorimetry (pages 511-513) 1. The property that is useful for keeping track of heat transfers in chemical