Coal, oil, and natural gas
a.
are renewable natural resources.
b.
are in very short supply for consumers.
c.
release carbon dioxide when they are burned.
d.
are clean fuels that contribute little to pollution.

answer: i have one answer

acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (h+) ions

explanation:

hope this and sorry i could only come up with one answer!

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.