Ch12_TestBank - Chapter 12, The Laws of Thermodynamics...

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Chapter 12, The Laws of Thermodynamics 168 C HAPTER 12 12.1 Work in Thermodynamic Processes 1. The volume of an ideal gas changes from 0.40 to 0.55 m 3 although its pressure remains constant at 50 000 Pa. What work is done on the system by its environment? a. –7 500 J b. - 200 000 J c. 7 500 J d. 200 000 J 2. During an isobaric process which one of the following does not change? a. volume b. temperature c. internal energy d. pressure 3. Area on a P-V diagram has units associated with: a. energy. b. momentum. c. temperature. d. change in temperature. 4. What is the work done on the gas as it expands from pressure P 1 and volume V 1 to pressure P 2 and volume V 2 along the indicated straight line? a. ( P 1 + P 2 )( V 1 - V 2 )/2 b. ( P 1 + P 2 ) ( V 1 - V 2 ) c. ( P 1 + P 2 ) ( V 1 - V 2 )/2 d. ( P 1 - P 2 ) ( V 1 + V 2 ) 5. On a P-V diagram, an ______________ process is represented by a horizontal line. a. isobaric b. isothermal c. isovolumetric d. adiabatic P P 2 P V V 2 V 1 P 1
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Chapter 12, The Laws of Thermodynamics 169 6. In an isobaric process 4.5 × 10 4 J of work is done on a quantity of gas while its volume changes from 2.6 m 3 to 1.1 m 3 . What is the pressure during this process? a. 1.2 × 10 4 Pa b. 2.4 × 10 4 Pa c. 3.0 × 10 4 Pa d. 4.1 × 10 4 Pa 12.2 The First Law of Thermodynamics 7. A system is acted on by its surroundings in such a way that it receives 50 J of heat while simultaneously doing 20 J of work. What is its net change in internal energy? a. 70 J b. 30 J c. zero d. - 30 J 8. In an isothermal process for an ideal gas system (where the internal energy doesn’t change), which of the following choices best corresponds to the value of the work done on the system? a. its heat intake b. twice its heat intake c. the negative of its heat intake d. twice the negative of its heat intake 9. According to the first law of thermodynamics, the sum of the heat gained by a system and the work done on that same system is equivalent to which of the following? a. entropy change b. internal energy change c. temperature change d. specific heat 10. If an ideal gas does positive work on its surroundings, we may assume, with regard to the gas: a. temperature increases. b. volume increases. c. pressure increases. d. internal energy decreases.
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Chapter 12, The Laws of Thermodynamics 170 11. In an isovolumetric process by an ideal gas, the system's heat gain is equivalent to a change in: a. temperature. b. volume. c. pressure. d. internal energy. 12. A 2.0-mol ideal gas system is maintained at a constant volume of 4.0 L. If 100 J of heat is added, what is the work done on the system? a. zero b. 5.0 J c. –6.7 J d. 20 J 13. A closed 2.0-L container holds 3.0 mol of an ideal gas. If 200 J of heat is added, what is the change in internal energy of the system? a. zero
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This note was uploaded on 02/23/2010 for the course PHY 2043 taught by Professor Isac during the Fall '09 term at University of Florida.

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Ch12_TestBank - Chapter 12, The Laws of Thermodynamics...

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