Answer
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.
