Multiple choice

Which of the following statements are FALSE?

  1. The system does work on the surroundings when an ideal gas expands against a constant external pressure.
  2. The change in internal energy, ∆E, for a process is equal to the amount of heat absorbed at constant pressure qp.
  3. If qp for a process is negative, the process is endothermic.
  4. The freezing of water is an example of an exothermic reaction.

  1. 1 and 2

  2. 1 and 4

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is the correct answer. Both statements 2 and 3 are false. The change in internal energy, ∆E, for a process is equal to the amount of heat absorbed at constant volume qv. The change in enthalpy, ∆H, for a process is equal to the amount of heat absorbed at constant pressure qp. If qp for a process is negative, the process is exothermic.

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