Find the pressure–temperature relationship at fixed volume
Three steps, the way the exam actually works: work through the lab, write down your own measurements, then answer a 6-point free response. What you recorded goes to the grader with your writing, so a conclusion that does not follow from your own numbers will cost you the point — exactly as it would with a real reader.
Run the investigation
- 1Set the volume slider to 2.40 and do not move it again — the container volume must stay constant.
- 2Set the temperature slider to 0.50 and record the relative pressure.
- 3Repeat at temperature 1.00, 1.50, and 2.00, recording the relative pressure each time.
- 4After recording all four, try moving the volume slider and watch what the pressure does — you will need this for part (d).
Booting the lab…
Record what you measured
These are your numbers, not ours. The grader sees them, so your conclusions have to follow from what you actually recorded.
| Relative pressure at T = 0.50 | |
|---|---|
| Relative pressure at T = 1.00 | |
| Relative pressure at T = 1.50 | |
| Relative pressure at T = 2.00 |
Answer the free response
You held the volume and the amount of gas constant and varied only the temperature. (a) State the mathematical relationship between pressure and temperature that your data support, and cite specific values from your table as evidence. (b) Explain the relationship using the kinetic molecular theory, addressing both how often particles strike the walls and how hard they strike. (c) Show how your relationship follows from the ideal gas law. (d) Predict what happens to the pressure if you now increase the container volume while holding temperature constant, and explain why in terms of collisions with the walls.
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