Rank the materials from most effective (coldest) to least effective (warmest) at keeping the cans cold. Materials:
6 Cans of Seltzer - All the same flavor, brand and size.
Wool Sock
Cotton Sock
Aluminum Foil
Paper Towel
Plastic Wrap

the awnser is group 12

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.