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May 24, 2015

Homework Help: (2-8) Chemistry - Science (Dr. Bob222)

Posted by Ana on Sunday, May 11, 2014 at 3:59pm.

Which of the following statements is correct?
A) The internal energy of a system increases when more work is done by the system than the heat that flows into the system.
B) The system does work on the surroundings when an ideal gas expands against a constant external pressure.
C) The internal energy of a system decreases when work is done on the system and heat flows into the system.
D) The internal energy of the system cannot change if T does not change.
E) All the statements are false.

The correct answer is B, but I wonder why D is not considered correct? I guess I am confused with the wording

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