Final answer:
Heating a substance typically results in increased average kinetic energy of its particles, resulting in higher entropy and potential phase changes from solid to liquid to gas.
Step-by-step explanation:
When a substance is heated up and the temperature increases, this means that there is an increase in the average kinetic energy of its particles according to the kinetic-molecular theory. This results in more extensive vibrations of the particles in solids, and more rapid translations of the particles in liquids and gases. As the temperature rises, the entropy, or disorder, of the system increases due to the broader distribution of kinetic energies among the particles. Moreover, a phase change can occur from solid to liquid to gas with increasing temperature.