Georgia Military CollegeCHE 105Thermodynamics answer key.

1. Define the following: a) System the part of the universe on which we are interested in. b) Surroundings: everything in the universe surrounding thermodynamic system c) Universe: the system and the surroundings in which energy is constant. d) State functions: variables that define the state of a system; independent of the pathway 2. True or False: a) The amount of Energy will depend on the initial and final states. TRUE b) A closed system exchanges energy and matter with the surrounding. FALSE. A closed system exchanges energy (not matter) with the surroundings. c) Energy flows between the system and the surrounds, but remains constant. TRUE d) State function are always extensive. FALSE. State functions can be either intensive or extensive. properties becomes an intensive property for example density or molar mass. 3. Does the energy change associated with a physical change depend on the initial and final states? Explain. Yes. The energy change of a physical change will vary depending on where the initial and final states are. If you are freezing water to form ice, the warmer the water is initially will determine how much energy change will be required to lower the temperature to form ice. If the water is cooler to begin with, a lower energy change will be required. 4. If an MP3 player does 200 KJ of work and released 100 kJ of heat, what is thechange in internal energy for the MP3 player?