Heat of Fusion Worksheet
This worksheet covers the concept of heat of fusion, including calculations and real-world applications.
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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 your work for calculation problems.
1. What is the heat of fusion?
The energy required to raise the temperature of a substance.
The energy absorbed during a phase change from liquid to gas.
The energy required to change a substance from solid to liquid at its melting point.
The energy released during a chemical reaction.
2. Which of the following statements is true regarding the temperature of a substance during melting?
The temperature increases steadily.
The temperature decreases steadily.
The temperature remains constant.
The temperature fluctuates unpredictably.
3. The SI unit for heat of fusion is .
4. When a substance freezes, it energy, which is equivalent to its heat of fusion.
5. Calculate the amount of heat energy required to melt 250 grams of ice at 0°C. (Heat of fusion of ice = 334 J/g)
6. Explain why the temperature of a substance does not change during the phase transition from solid to liquid, even though heat energy is being added.
7. The heat of fusion is an intensive property.
True
False
8. Different substances have the same heat of fusion values.
True
False
9. A 500 g sample of an unknown substance requires 150,000 J of heat energy to melt completely at its melting point. Calculate the heat of fusion for this substance.