Help! Need answers for #1-5.

For number 1 you can put The substance appeared to have a physical change. And for number 2 ice changes to water by a process that is called melting and for number 3 state of matter and for number 4 when something dissolves it is a solid turning to a liquid and for number 5 It has horizontal lines to represent the change hope that helps :)

6.38 (m/s^2)

Explanation:

Acceleartion is simply Δv/Δt, which we are both given. 26.8/4.2 = 6.38