Which of the following changes would show a decrease in energy? a. gas to plasma b. solid to gas c. liquid to gas d. liquid to solid which of the following is true about a change from a solid to a liquid? a. the particles speed up. b. the particles slow down. c. the particles remain at the same energy level. d. the particles get closer together.

I heard of this before I think I know the answers.

1st one, I'm thinking D. Because Turning Liquid into a Solid means like it would take energy out since its freezing.

2nd one, I would choose A
 B and C why would they slow down if they were still in a solid. they attracted one another, but they stood still(Didn't move). D is explaining how Liquid turns into a Solid, so this is definitely incorrect. So I would choose A. 

I really do hope this helps you out. (Idk about the 1st, but 2nd I think its the answer)

Must be negative.substance increases