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Spontaneous change

Page history last edited by Joe Redish 9 years, 7 months ago

7.3.3.P5

 

1. A subsystem A is in thermal contact with its environment B, which together comprise an isolated system. Which of the above four situations can actually occur in the real world? (Choose all that apply.)

  1. Entropy of A increases by 5 J/K; entropy of B decreases by 5 J/K.
  2. Entropy of A increases by 5 J/K; entropy of B decreases by 3 J/K.
  3. Entropy of A increases by 3 J/K; entropy of B decreases by 5 J/K.
  4. Entropy of A decreases by 3 J/K; entropy of B increases by 5 J/K.

 

2. Which of the following conditions are necessary for a system to undergo a spontaneous process, if the system is held at constant temperature and pressure?

  1. ΔGsys < 0
  2. ΔGsys > 0
  3. ΔGsys < 0, ΔSsys > 0
  4. ΔGsys < 0, ΔSsys < 0
  5. ΔGsys < 0, ΔSsys = 0
  6. ΔGsys > 0, ΔSsys > 0

 

 

 

Ben Geller, Ben Dreyfus, and Joe Redish 5/21/12 

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