Which of the following processes would be expected to have a positive sign for D S _system?
I. Hot air expanding.
II. A piece of wax melting.
III. Alcohol evaporating.

Question

Which of the following processes would be expected to have a positive sign for D S _system? I. Hot air expanding. II. A piece of wax melting. III. Alcohol evaporating.

Quizplus · Accepted Answer

All of these processes involve a transition to a more disordered state: hot air expanding increases the disorder by spreading out, wax melting from solid to liquid increases disorder, and alcohol evaporating from liquid to gas greatly increases disorder. Thus, all have a positive change in entropy ($ \Delta S > 0 $).

Which of the Following Processes Would Be Expected to Have