8 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Heat of Fusion 4 questions
Heat of Fusion
New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.
Use q = mHf for melting at the melting point. For the ice in this worksheet, Hf = 334 J/g.
Question 1
How much heat melts 10.0 g of ice at 0 °C to liquid water at 0 °C?
- 33.4 J
- 334 J
- 3,340 J
- 33,400 J
Question 2
For an ice sample that melts, explain why q for the sample is positive.
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Question 3
A sample at its melting point absorbs 1,670 J of heat entirely as it melts. What mass of ice melts?
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Question 4
Which equation models a temperature increase while a substance remains solid?
- q = mHf
- q = mHv
- q = mcΔT
- P₁V₁ = P₂V₂
Melting Ice in a Model 4 questions
Melting Ice in a Model
Use the information below to answer the questions.
A heater supplies the indicated energy to each pure ice sample with negligible loss. All samples begin at 0 °C. A sample remains at 0 °C while ice and liquid water coexist.
| Sample | Ice mass (g) | Energy supplied (J) |
|---|---|---|
| P | 20.0 | 3,340 |
| Q | 20.0 | 6,680 |
| R | 10.0 | 6,680 |
Question 5
Which sample still contains ice after receiving its listed energy?
- P only
- Q only
- R only
- All three
Question 6
Calculate how many grams of ice melt in P. Use its supplied energy and the heat of fusion.
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Question 7
Which sample just finishes melting with no energy left to warm the liquid?
- P
- Q
- R
- None
Question 8
Explain why the final liquid in R can be warmer than 0 °C. Refer to its melting requirement.
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