Does matter contract when it is heated?

Heat causes matter to expand. Matter absorbs energy when heated, and when a substance's kinetic energy rises, the solid liquefies and turns into a liquid that eventually turns into a gas.

An increase in energy, such as that caused by heating, can break bonds and result in a chemical reaction or a change in state.

Temperature is a measure of kinetic energy; the more kinetic energy, the more motion there is in the matter. Heating, as an increase in energy, more frequently causes an increase in temperature.

Adding heat that causes a phase change will typically cause the matter to expand because an increase in motion causes the molecules to move apart, which causes the matter to expand whether it is a solid, liquid, or gas.

Yes, matter generally expands when heated and contracts when cooled. This is due to the increase or decrease in the average kinetic energy of its particles, causing them to move farther apart when heated and closer together when cooled.