As a substance melts its temperature remains constant, even though heat is still being applied.Describe the energies involved in the change of phase.

When a substance melts, it undergoes a phase change from solid to liquid. During this process, the temperature of the substance remains constant, despite the continuous application of heat. This is because the energy supplied is used to overcome the forces of attraction between the particles of the substance, rather than to increase the kinetic energy of the particles (which would raise the temperature).

Here are the energies involved in this process:

1. Kinetic Energy: This is the energy of motion. In the context of a substance, it refers to the movement of its particles. When heat is applied, the kinetic energy of the particles increases, causing them to move faster. However, during the phase change, the kinetic energy remains constant as the temperature does not increase.

2. Potential Energy: This is the energy stored in the substance due to the forces of attraction between its particles. When heat is applied, this energy increases as the particles move apart during the melting process. The increase in potential energy is equal to the heat energy supplied, which is why the temperature remains constant.

3. Heat Energy: This is the energy supplied to the substance to cause the phase change. It is used to increase the potential energy of the substance, i.e., to overcome the forces of attraction between the particles, allowing the substance to change from solid to liquid.

In summary, during the phase change from solid to liquid, the heat energy supplied is used to increase the potential energy of the substance, rather than its kinetic energy. This is why the temperature remains constant during the melting process.