Asubstance has a freezing point of 24 °c. which of the following is true for the substance?

a. it will also change from a solid to a liquid at 24 °c while the solid loses energy
b. it will also change from a solid to a liquid at 24 °c while the solid gains energy
c. it will also change from a solid to a gas at 24 °c while the solid loses energy
d. it will also change from a solid to a gas at 24 °c while the solid gains energy

A phase change is a change in the states of matter. For example, a solid may become a liquid. This phase change is called melting. When a solid changes into a gas, it is called sublimation.

Explanation:

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.