Multiple Choice. (15 points) Choose the best answer and write the letter (upper case) on your submission. 1. An ideal gas is in a closed system with non-rigid walls. Which of the following is possible? A. Electrical work B. Polytropic process work C. Work by a paddle-wheel D. All of the above E. None of the above 2. A gas in a piston-cylinder expands in a quasiequilbrium process. A. The pressure of the gas is equal to the pressure of the surroundings during the entire process B. The path of the process can be shown in a pressure vs. volume plot of the gas C. The expansion can be described by a polytropic process D. All of the above E. None of the above 3. A closed system can go from State 1 to State 2 using different processes. Which of the following is always TRUE whenever the system goes from State 1 to State 2 ? A. The Work involved is always the same B. The change in internal energy is always the same C. The Heat involved is always the same D. All of the above E. None of the above 4. Which of the following can be seen in a phase diagram of a pure substance? A. The pressure where solid, liquid, and gas are in equilibrium B. The temperature and pressure where the properties of the liquid and vapor are the same C. Information on whether the solid is less dense than the liquid D. All of the above E. None of the above 5. Saturated water vapor in a piston-cylinder is cooled at constant pressure until it becomes saturated liquid. Which of the following is TRUE during the process? A. The temperature decreases B. The quality increases C. The change in enthalpy is equal to the heat removed D. All of the above E. None of the above