He added ¼ cup of room-temperature water to one glass and ¼ cup of room-temperature vinegar to the other. Before you see Koby's results, make a hypothesis about each combination. Will combining water and baking soda result in a chemical reaction? Will combining vinegar and baking soda result in a chemical reaction?

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

what are the statements

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.