Question

1. A gas absorbs 0.0 J of heat and then performs 30.8 J of work. The change in internal energy of the gas is a. 61.6 J. b. 30.8 J. c. -61.6 J. d.-30.8 J. e. none of these 2. Which of the following statements correctly describes the signs of q and w for the following exothermic process at P= 1 atm and T = 370 K? H2O(g) → H2O(1) a. q and w are negative. b. is positive, wis negative. c. q is negative, w is positive. d. q and w are both positive. e. q and w are both zero. 3. For a particular process q = 20 kJ and w = 15 kJ. Which of the following statements is true? a. Heat flows from the system to the surroundings. b. The system does work on the surroundings. c. AE = 35 kJ. d. All of the above are true. e. None of the above are true. 4. Which of the following statements is correct? a. The internal energy of a system increases when more work is done by the system than heat was flowing into the system. b. The internal energy of a system decreases when work is done on the system and heat is flowing into the system. c. The system does work on the surroundings when an ideal gas expands against a constant external pressure. d. All statements are true. e. All statements are false.

Answer 1

1.

Etw = -30.8 0 2 . qenve cc) W- tve & I - qtw - 20115 35 ki 4 co is correct