00:01
Typically, if we have what's called volume contraction upon mixing, then we have an exothermic mixing where heat is released, which means that the molecules of x are more attracted to y than each other, and the molecules of y are more attracted to x than each other, allowing heat to be released upon mixing.
00:32
A says either compound's x or y is polar while the other is nonpolar.
00:38
This is false because if that were the case, then mixing wouldn't occur at all.
00:44
B says compound y molecules have stronger attractive forces to one another than to x molecules, and this would be false, or unless entropy takes over, mixing wouldn't occur at all.
00:59
If y wants to be attracted to y, it'll be attracted to y and won't mix by being attracted to x.
01:08
C says compounds x and y are more miscible in one another at low temperatures.
01:14
Well, if the mixing process x plus y resulting in solution is exothermic, then heat is released.
01:26
If heat is released, then if we decrease temperature, we'll allow more of the solution to form.
01:33
So compounds x and y do become more miscible in one another at low temperatures...