Physical changes are changes that don't change the structure of the individual molecules. Though heating a liquid to a gas will change how the molecules are bound to each other, the individual molecules will not change. This is contrasted from a chemical change, where the atoms of the molecules are rearranged.
All states of matter do not necessarily have molecules. The noble gases consist of individual atoms, and ionic compounds consist of ions, or formula units. All states of matter must contain atoms, molecules, or ions, because matter is made of atoms, molecules, and ions.
If by matter you mean molecules / atoms then no. Physical change is when the look / shape of something is changed but not its chemical structure, chemical change is when the molecules that make up the object n question are changed.
No, it depends on the degree of compactment of its individual molecules or matter.
The three states of matter are different in terms of the attraction force on the individual molecules. The attraction force on the solids molecules is the greatest while the attraction force between the molecules in the gaseous state is he weakest.
heat, heat can change the state of matter therefore speeding up molecules.
the state of matter changes from liquid to gas, so the molecules spread out.
the denseness of the molecules change(compact=solid, really far=gas, in the middle=liquid)
There are empty spaces between the particles of matter that are very large and that can be used to identify a substance because they never change.