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Testing Heat-Sealed Air Samples 4 questions
Testing Heat-Sealed Air Samples
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A school lab tests two rigid containers holding air. Each container has the same fixed volume. At first the containers and their air samples are both at 300 K and 100 kPa absolute pressure. They warm to 330 K and are then returned to 300 K. The same pressure gauge is used throughout.
| Stage | Container R (kPa absolute) | Container S (kPa absolute) |
|---|---|---|
| Before warming | 100 | 100 |
| After warming | 110 | 99 |
| Back at 300 K | 100 | 90 |
Question 1
Use the original pressure and temperature to predict the pressure at 330 K if the amount of gas stays fixed. Show your setup.
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Question 2
At 330 K, container S has a lower pressure than R. A student concludes the particles in S have a lower average kinetic energy. Use the particle model to evaluate that conclusion.
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A student suggests that S might still contain its original amount of air and that the lower final pressure could be due solely to cooling back to 300 K.
Question 3
Which two measurements best test that explanation? State what they imply about S.
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Question 4
Under the model, what fraction of S’s initial amount of air remains when it returns to 300 K?
- 0.10
- 0.90
- 1.00
- 1.10
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