Final answer:
If a substance is in the solid phase and its particles gain kinetic energy and get more disordered, it is likely to change into the liquid phase.
Step-by-step explanation:
The state of a substance depends on the balance between the kinetic energy of the individual particles (molecules or atoms) and the attractive forces between molecules, called intermolecular forces. Heating and cooling can change the kinetic energy of the particles in a substance, and so, we can change the physical state of a substance by heating or cooling it. In this case, if a substance is in the solid phase and its particles gain kinetic energy and get more disordered, it is likely to change into the liquid phase.