When a substance freezes, heat energy is released as water molecules combine and form hydrogen bonds. The formation of hydrogen bonds helps the hexagonal crystal structure form. When the substance melts, heat energy is absorbed as water molecules separate from each other and break hydrogen bonds.

Sort the following statements based on whether they describe water freezing, water melting, or water both freezing and melting.

At 0 ?C, molecules enter the phase.

At 0 ?C, molecules are lost from the phase.

Removal of heat energy stabilizes the phase.

Water molecules move toward each other to form hydrogen bonds.

Addition of heat energy stabilizes the phase.

Molecules arrange in a hexagonal crystal structure.

Water molecules move away from each other to break hydrogen bonds.

1.Freezing of water

2.Melting of water

3.Both freezing and melting of water