Question

The value of $\Delta E$ for an open and isolated system respectively is

• A. zero; non-zero
• B. zero
• C. non-zero; zero
• D. non-zero

Answer 1

Answer: (C)

For an open system; exchange of matter as well as energy with its surroundings can takes place.
Thus, $\Delta E\ne 0$, whereas an isolated system exchanges neither matter nor energy with the surroundings and, therefore $\Delta E=0$.