They can;
Gases
Change of state.
The change from one state of matter to another is called a phase transition.
phase change.
a chemical change
by changing it
No
Matter I think I'm not 100% shure but it say in my book matter in one state often can change to another state by adding or removing thermal energy
The most important is the liquefaction of gases.
Pressurised gases will eventually liquify.
Gas is a state and liquid is a state. To go from one of these states to another is condensation.
tempature