Question

do all substances change from solid to liquid and liquid to gas on heating ?explain

Answer 1

In many cases, yes. But we have some substance as sublime substances, they change directly from solid to gas and vice versa.
Some examples are :-
Iodine
Camphor
Dry ice
etc.

Answer 2

1. No,All substances do not change from solid to liquid and from liquid to gas.
2. Substances such as camphor and ammonium chloride change from solid to gaseous state of on heating.
3. Solid camphor on heating changes to directly from solid state to gaseous state and vice versa without passing through liquid state.
4. This phenomenon is called "sublimation".