Question

Which of the following are phase changes? (Select all that apply.)

melting
gases
sublimation
reactions

Answer 1

melting and sublimation ! melting (changing from a solid into a gas) and sublimation (changing straight from a solid into a gas) :)

Answer 2

- melting

- sublimation

Step-by-step explanation:

A phase change is a, well, change between phases. Solid to liquid. Gas to solid. Etc. Gases is a phase, but not a change. Reactions is a change, but not a phase change. This leaves us with melting (solid to liquid) and sublimation (solid to gas).

Have a nice day!

I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather