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Reading Melt Fractions at One Temperature 4 questions
Reading Melt Fractions at One Temperature
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A display begins with two 10 g solid samples at their respective melting points. Both melting points are 30 °C. The model holds a sample at 30 °C while it is partly melted and treats all heat supplied during that time as melting energy. The two solids require different energy per gram to melt.
| Sample | Energy needed to melt 1 g (J) | Energy supplied so far (J) |
|---|---|---|
| P | 20 | 120 |
| Q | 40 | 120 |
Question 1
Which sample can melt more mass with the energy supplied so far?
- P only
- Q only
- Both melt the same mass.
- The shared temperature prevents a comparison.
Question 2
Calculate the melted mass of each sample and compare the fractions melted.
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Question 3
A student says the equal temperature readings show that the samples are at the same stage of melting. Evaluate the claim using the masses.
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The display now adds more energy only to Q. It wants Q to match P’s current melted fraction without melting the whole sample.
Question 4
Find the additional energy Q needs to reach the target.
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