Which order shows the materials having the highest to lowest temperature after 15 minutes of being under the lamps?

air, soil, sand, water
sand, air, water, soil
soil, water, air, sand
water, sand, soil, air

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

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.