Question

assignment
multiple - choice question
what is the heat of fusion?
extra energy to turn ice into water
extra energy to turn water to ice
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Explanation:

The heat of fusion is the amount of energy required to change a substance from a solid to a liquid (melting). For water, it's the extra energy needed to turn ice into water. Turning water to ice is the opposite process (freezing) and involves the heat of solidification.

Answer:

A. extra energy to turn ice into water