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Reading Water Rise in Two Model Tubes 4 questions
Reading Water Rise in Two Model Tubes
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class models water rising above a reservoir in narrow glass tubes. For two tubes with the same surface, the model predicts that the final rise is inversely proportional to the inside radius. A coating can change the attraction between water and the wall. The reservoir level is the zero mark.
| Tube | Radius (mm) | Inside surface | Height at 2 s (mm) | Final height (mm) |
|---|---|---|---|---|
| A | 0.50 | Bare | 8 | 24 |
| B | 1.00 | Bare | 9 | 12 |
| C | 0.50 | Coated | 9 | 10 |
Question 1
Which pair isolates the effect of changing the surface?
- A and B
- A and C
- B and C
- All three tubes together
Question 2
Use the bare-tube model to predict the final rise in a bare tube of radius 0.75 mm. Show your work.
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Question 3
A student looks only at the 2 s data and says B and C have identical water–wall attractions. Explain how the table and model limit that inference.
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A fourth tube has the coating used in C and a radius of 1.00 mm. Its final rise is 5 mm.
Question 4
Use C and the fourth tube to evaluate whether the inverse-radius pattern also fits the coated tubes.
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