While ice at 0 degrees Celsius is melting, the heat supplied
- A. raises its temperature steadily
- B. breaks the bonds of the solid structure without changing the temperature
- C. is lost to the surroundings entirely
- D. lowers the internal energy
Explanation
The latent heat of fusion goes entirely into overcoming the forces holding the lattice, so the temperature stays at the melting point until all the ice has gone. This is why a mixture of ice and water is a reliable fixed point for calibrating a thermometer. The internal energy rises even though the temperature does not.