Physical Chemistry Chapter 2 Heat: the transfer of energy as disorderly motion as e the result of a temperature difference between the system and its surroundings exothermic: a process that releases energy as heat (all combustion reactions endothermic: processes that adsorb energy as heat (the vaporization of water an adiabatic system a)an an endothermic exothermic process process 1010 exothermic: a process that releases energy as heat (all combustion reactions) endothermic: processes that adsorb energy as heat (the vaporization of water) Heat: the transfer of energy as disorderly motion as the result of a temperature difference between the system and its surroundings. (a) (b) Physical Chemistry Chapter 2 an adiabatic system (a) an endothermic process (b) an exothermic process