Question

what happens when you heat a solid? heating a substance increases its thermal energy. when the particles in a solid have more thermal energy, they vibrate more quickly, and the temperature of the substance goes up. once the substance reaches a certain temperature, called its melting point, the substance can begin to change state. as more thermal energy is added to the substance, its particles gain enough thermal energy to move around more freely. the particles remain close together, but they are able to slide past one another. when all of the particles have broken out of their fixed positions, the substance has changed state. which of the following happen during this change of state? select all that apply. the particles in the substance move far apart. the number of particles in the substance increases. the substance melts and becomes a liquid.

Explanation:

• When a solid melts to become a liquid, the particles gain enough thermal energy to move around more freely but still remain close together (so the statement "The particles in the substance move far apart" is incorrect as that occurs when a liquid turns to a gas).
• The number of particles in the substance does not increase during a change of state (it is a physical change, not a chemical change that would involve a change in the number of particles).
• When a solid reaches its melting point and enough thermal energy is added, it melts and becomes a liquid.

Answer:

The substance melts and becomes a liquid.