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Checking Which Bubble Feeds the Other 4 questions
Checking Which Bubble Feeds the Other
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A display models two soap bubbles with the same film composition. The inside pressure exceeds the outside pressure by 8 Pa·cm divided by the radius in centimeters. All readings are relative to the same room pressure, which is marked 0 Pa. A negative reading means the pressure is below room pressure. Compare initial readings before the bubbles change size.
| Bubble | Radius (cm) | Outside reading relative to room (Pa) |
|---|---|---|
| P | 1.0 | 0 |
| Q | 2.0 | 0 |
Question 1
Calculate the inside pressure reading for each bubble relative to the room. Include the outside reading.
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Question 2
The display opens a gas path between the bubbles. Which way does gas initially flow in the model?
- From P to Q
- From Q to P
- No net flow
- The two pressures are insufficient
Question 3
A student says equal outside pressures guarantee equal inside pressures. Evaluate the claim using both radii.
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A repeat starts with the same two radii. The outside reading around Q stays at 0 Pa. The class changes the outside pressure around P before connecting them.
Question 4
Find the outside reading around P that makes the inside pressures equal before connection. Give it relative to the room.
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