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# When heat energy is added to a system which of the following observations usuall...

### Question

When heat energy is added to a system which of the following observations usually occur:

(1) The internal energy of the system increases;

(2) Work may be done on the surroundings;

(3) The volume of system is directly proportional to the temperature.

### Options

A)
1 and 2 only
B)
1, 2 and 3
C)
3 only
D)
None of the above.