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Calibrating a Cup for Heat Measurements 4 questions
Calibrating a Cup for Heat Measurements
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class measures heat transfer in an insulated cup. It puts 100.0 g of water at 20.0 °C in a cup that is also at 20.0 °C. Students pour in 50.0 g of water at 50.0 °C. The stirred mixture and cup reach 29.0 °C. The model ignores energy exchange with the surroundings. Use 4.18 J/(g·°C) for the specific heat of liquid water.
Question 1
Which statement describes the directions of energy transfer while the temperatures approach 29.0 °C?
- Both portions of water lose energy to the cup.
- The warm water loses energy and the cool water and cup gain energy.
- The warm water gains energy from the cooler cup.
- The cup transfers energy to both portions of water.
Question 2
Calculate how much heat the 100.0 g portion of water gains. Show your setup.
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Question 3
Calculate the heat gained by the cup. Use the loss from the warm water and the gain by the cool water.
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In a second test, a reaction warms the same cup by 4.5 °C and the water gains 2.50 kJ. Use a model in which the heat absorbed by the cup is proportional to its temperature change.
Question 4
Estimate the total heat released by the reaction. Show how you used the temperature change and the result from the calibration.
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