(a) a moving car; (b) an inflated balloon; (c) a pitched baseball just as it is being released by the pitcher; (d) a flashlight battery; (e) a frozen lake; (f ) a car as it moves along the highway. Which of the following illustrate the concept of potential energy, and which illustrate kinetic energy? Which of the following processes are exothermic? Endothermic? How can you tell? (a) burning gasoline; (b) freezing ice cream; (c) melting chocolate; (d) cooling hot water; (e) condensing water vapor; (f ) burning a match. Which of the following processes are exothermic? Endothermic? How can you tell?