a. Exothermic b. Exothermic c. Endothermic d. Endothermic
Work Step by Step
a. Because the combustion in a car engine releases heat energy, the process is an exothermic process. b. The condensation of water is the transformation of water from a gas phase to a liquid phase. Therefore, water loses energy in this phase change, an exothermic process. c. The sublimation of a substance requires energy to be absorbed by the system. Therefore, this process is an endothermic process. d. This process involves the breaking of the F-F bond which requires the absorption of energy. Therefore, this process is endothermic.