Review_Questionsrevised - APSC 132 MULTIPLE CHOICE REVIEW...

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APSC 132 MULTIPLE CHOICE REVIEW 1. A gas absorbs 0.0 J of heat and then performs 15.2 J of work. The change in internal energy of the gas is: (a) -24.8 J (b) 14.8 J (c) 55.2 J (d) -15.2 J (e) none of these 2. Under conditions of constant pressure, the heat flow that occurs during a chemical change is equal to: (a) E (b) T (c) H (d) V (e) w 3. Which of the statements correctly describes the signs of q and w for the following exothermic process at P = 1 atm and T = 370 K? H 2 O (g) H 2 O (l) (a) q and w are negative (b) q is positive, w is negative (c) q is negative, w is positive (d) q and w are both positive (e) q and w are both zero 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.
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5. Consider a process in which you add 45 J of heat to a system, let it do 10 J of expansion work, then return it to its initial state by cooling and compression. Which statement below is true for this process? (a) H < E (b) The work done in compressing the system must exactly equal the work done by the system in the expansion step. (c) H = 70 J (d) The change in internal energy for the process described above is zero. 6. For the reaction H 2 O (l) H 2 O (g) at 298 K, 1.0 atm, H is more positive than E by 2.5 kJ/mol. This quantity of energy can be considered to be: (a) the heat flow required to maintain a constant temperature (b) the work done by system in pushing back the atmosphere. (c) The difference in the H-O bond energy in H 2 O (l) compared to H 2 O (g). (d) The value of H itself. (e) None of these. 7. For which process is S negative? (a) evaporation of 1 mol of CCl 4 (l). (b) mixing 5 mL of ethanol with 25 mL of water (c) compressing 1 mol Ne at constant temperature from 0.5 atm to 1.5 atm (d) raising the temperature of 100 g cu from 275 K to 295 K. (e) grinding a large crystal of KCl to power 8. Which statement is true? (a) All real processes are irreversible (b) A thermodynamically reversible process takes place infinitely fast. (c) In a reversible process, the state functions of the system are always much greater than those of the surroundings. (d) There is always more heat given off to the surroundings in a reversible process than in an irreversible process. (e) All statements (a-d) are true. 9. A 100 mL sample of water is placed in a coffee cup calorimeter. When 1.0 g of an ionic solid is added, the temperature decreases from 21.5 ° C to 20.8 ° C as the solid dissolves. For the dissolving of the solid (a) H > 0 (b) S univ > 0 (c) S sys < 0 (d) S suit > 0 (e) none of these is true
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10. A chemical reaction is most likely to be spontaneous if it is accompanied
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This note was uploaded on 12/01/2010 for the course APPLIED SC 131 taught by Professor Professornewstead during the Fall '09 term at Queens University.

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Review_Questionsrevised - APSC 132 MULTIPLE CHOICE REVIEW...

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