Question

multiple choice question during the melting of ice, the added heat ______. raises the temperature of the ice - water mixture increases the speed of molecular motion locks the water molecules in a fixed, three - dimensional pattern breaks hydrogen bonds

Explanation:

When ice melts, it is a phase - change process at a constant temperature (0°C at standard pressure). The added heat is used to break the hydrogen bonds that hold water molecules in the rigid, ordered structure of ice. Temperature remains constant during melting, so it doesn't raise the temperature of the ice - water mixture. Molecular motion speed doesn't increase during melting as temperature is constant. And melting doesn't lock water molecules but rather frees them from the fixed pattern.

Answer:

D. breaks hydrogen bonds