Question

When a solid is ______, its molecule gains kinetic energy and becomes very active.

Answer 1

• The heating of the substance will increase the kinetic energy of atoms or molecules.
• An increase in kinetic energy increases the vibration of molecules or atoms of the substance and becomes very active.
• This increase in vibration results in an increase in space between atoms.
• As the space between atoms and molecules increases the state of matter will change.

Therefore, When a solid is heated, its molecule gains kinetic energy and becomes very active.