Heat of Fusion Worksheet
Explore the concept of heat of fusion, latent heat, and phase changes between solid and liquid states.
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Heat of Fusion Worksheet
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Read each question carefully and answer to the best of your ability. Show all calculations where necessary.
1. What is the definition of heat of fusion?
The energy required to raise the temperature of a substance.
The energy released when a substance freezes.
The energy required to change a solid into a liquid at its melting point.
The energy required to change a liquid into a gas at its boiling point.
2. Which of the following best describes latent heat?
Heat that causes a change in temperature.
Heat that causes a change in phase without a change in temperature.
Heat that is lost to the surroundings.
Heat that is gained from the surroundings.
3. The melting point of a substance is the temperature at which it changes from a to a .
4. When a substance melts, the added energy is used to overcome the forces between particles, rather than increasing their kinetic energy.
5. The heat of fusion for a given substance is always a positive value.
True
False
6. Explain why the temperature of a substance does not change during a phase transition, even though heat is being added or removed.
7. Calculate the amount of heat energy required to melt 250 grams of ice at 0°C. The heat of fusion for water is 334 J/g.