How does the state of matter change with the change in temperature?

Answer 1

Generally speaking, the state of matter tends to reflect the dissociation of bonds with increasing temperature. As you warm ice above 0 degrees Celcius, the fixed bonds of matter in the solid state disappear where one particular molecule is bonded to another specific molecule, and the matter turns into liquid. The intermolecular forces still exist, but the molecules do not associate with any particular other molecule anymore. When it turns to a gas above 100 degrees, the bond energy between molecules is no longer significant, and the molecules are free to roam in the gaseous state. Similar is true of transition with the bonds between atoms in the atomic lattice.

This is a slight simplification as there are other states, for example there are intermediate states, also, at extremely low / cold temperatures the Einstein-Bose condensate may form where separate atoms may assume the same quantum state, and at extremely high temperatures, the electrons may dissociate from their nuclei and the matter enters the plasma state.