Final answer:
Covalent bonds remain intact when hydrogen bonds break during the melting of ice or boiling of water.
Step-by-step explanation:
When hydrogen bonds break during the melting of ice or the boiling of water, the covalent bonds remain intact. Covalent bonds are formed when atoms share electrons, and they hold the water molecules together. The breaking of hydrogen bonds allows the water molecules to move more freely, transitioning from a solid to a liquid or a liquid to a gas state.