Question

Which of the following statements concerning entropy is/are CORRECT?

1. The entropy of a substance increases when converted from a liquid to a solid.
2. The entropy of a substance decreases as its temperature increases.
3. All substances have positive standard molar entropies at temperatures above 0 K.

a. 1 only
b. 2 only
c. 3 only
d. 1 and 2
e. 1, 2, and 3

Answer 1

c. 3 only

Step-by-step explanation:

The entropy of a perfect crystal at 0 K is zero. As you increase the temperature, the atoms begin to move more vigorously, and energy is distributed among more possible energy levels.

1 is wrong. The entropy of a liquid decreases when it is converted to a solid.

2 is wrong. The entropy of a substance increases as its temperature increases.