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Checking Heat With a Melting Ice Cup 4 questions
Checking Heat With a Melting Ice Cup
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A display uses a cup containing ice and liquid water at 0 °C. The temperature stays at 0 °C as long as both phases remain. A transfer of 334 J into the cup can melt 1.00 g of ice in the model. The class measures how much ice melts while two warm objects cool separately in identical cups. The cups exchange no heat with the room.
| Warm object | Ice melted (g) | Final cup temperature (°C) |
|---|---|---|
| P | 2.0 | 0 |
| Q | 5.0 | 0 |
Question 1
Which object transfers more energy to its cup?
- P, because it melts less ice.
- Q, because it melts more ice.
- Both transfer the same energy because both end at 0 °C.
- Neither transfers energy while the cup stays at 0 °C.
Question 2
Calculate how many more joules Q transfers than P. Show how the ice masses enter the calculation.
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In a repeat, Q cools while transferring energy to both the ice cup and a second metal plate. The cup still contains ice and water at 0 °C after the test, but only 3.0 g melts. A separate measurement shows the plate gains 668 J. No energy is exchanged with the room.
Question 3
Use both the melted ice and the plate reading to calculate the total energy transferred out of Q in the repeat.
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Question 4
A student claims Q transfers less energy in the repeat because less ice melts. Evaluate the claim using the original and repeat records.
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