Classify the following bonds as ionic, polar
covalent, or nonpolar covalent, and explain:
(a) the CaO bond in CaO, (b) the CC bond in C13CCC13,
(c) the CCl bond in C13CCC13,
(d) the SeCl bond
in SeCl2.

c, liquids evaporate, creating a gas

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.