2) Which of the following processes always results in an increase in the energy

Question

2) Which of the following processes always results in an increase in the energy of a system?
A) The system loses heat and has to work done on it by the surroundings
B) The system gains heat and does work on the surroundings?
C) The system gains heat and has work done on it by the surroundings
D) None of these is always true
E) The system loses heat and does work on the surroundings

3) Deviations from the ideal gas law are greater at
A) low temperature and low pressures
B) high temperatures and low pressures
C) high temperatures and high pressures
D) low temperatures and high pressures

Explanation / Answer

Answer – 2) We need to look for the system which processes always results in an increase in the energy of a system. We know the increase in the energy of a system means the system absorbing the heat from the surrounding or external source and work done on surrounding.

So answer for this one is C) The system gains heat and has work done on it by the surroundings.

3) We know as we increase the temperature their kinetic energy of gas molecule increase and they go apart from each other and there is no much longer intermolecular force and as we decrease the pressure gas molecules again goes apart from each other and there is no much longer intermolecular force. When gas molecules are separating from to each other, then there are not obeying the ideal law means there is showing deviation.

So answer for this one is B) high temperatures and low pressures

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