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First Law of Thermodynamics

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First Law of Thermodynamics Answer Key

Which of the following terms comprises the surroundings and the system involved in the study of thermodynamics?
  1. an open system
  2. a closed system
  3. an isolated system
  4. the universe
Which of the following equations is used to represent the First Law of Thermodynamics for a closed system, according to the IUPAC convention?
  1. [math]DeltaU=Q+W[/math]
  2. [math]DeltaU=W-Q[/math]
  3. [math]DeltaU=Q-W[/math]
  4. [math]DeltaU=Q+2W[/math]
Which of the following systems does not allow for energy or matter to be exchanged with the surroundings?
  1. Open
  2. Closed
  3. Adiabatic
  4. Isolated
Which of the following systems only allows for the exchange of energy with the surroundings?
  1. Closed
  2. Isolated
  3. Open
  4. None of the above
Which system permits energy and matter to be exchanged with the surroundings?
  1. Isolated
  2. Open
  3. Adiabatic
  4. Closed
In which of the following cases would [math]∆U[/math] in [math]∆U=Q+W[/math] be less than zero?
  1. Work is done on the system.
  2. Work is done by the system.
  3. The magnitudes of heat and work are equivalent.
  4. The magnitude of heat is greater than that of the work.
Which of the following expressions correctly characterizes an isolated system?
  1. [math]∆U<0[/math]
  2. [math]∆U=0[/math]
  3. [math]∆U>0[/math]
  4. None of the above
Which equation is associated with heat in a system that is thermally isolated?
  1. Q<0
  2. Q>0
  3. Q>W
  4. Q=0
Complete the following equation for a mechanically isolated system: [math]∆U=[/math]Q.
If a process is endothermic, the value of q is less than zero.
  1. True
  2. False
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