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Reading Two Heating Curves That Cross 4 questions
Reading Two Heating Curves That Cross
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A classroom model heats two solid samples. Neither changes phase. Each receives energy from its heater at 10 J per minute, and each loses negligible energy to the surroundings. The graph records the temperature of each sample. The heat capacity of a sample is the energy required to raise that entire sample by 1 °C.
Question 1
At which recorded time do the two samples have the same temperature?
- 2 min
- 4 min
- 6 min
- 8 min
Question 2
Use the first six minutes of the graph to compare the average temperature increase per minute for the two samples.
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Question 3
At six minutes the samples have the same temperature. Explain why their temperature changes and the energy supplied show that B has the greater heat capacity.
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The class repeats the test with B. It changes the rate of energy transfer from B’s heater while keeping the sample and the other conditions the same.
Question 4
What heater energy transfer rate would make B warm at the same rate that A warmed in the first test? Show your reasoning.
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