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Reading a Bond Model After Isotope Replacement 4 questions
Reading a Bond Model After Isotope Replacement
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A display models a molecule with a hydrogen atom bonded to chlorine. It can replace the hydrogen with a heavier isotope of hydrogen. In this model the connection and the strength of its restoring pull stay the same. A heavier atom at one end makes the bond vibrate fewer times per second.
| Model | Hydrogen isotope | Mass number of hydrogen | Vibration rate (model units) |
|---|---|---|---|
| P | Hydrogen-1 | 1 | 12 |
| Q | Hydrogen-2 | 2 | 9 |
Question 1
Which model has the slower vibration?
- P only
- Q only
- They vibrate equally fast.
- The rate is not given.
Question 2
Explain how Q can have a different vibration rate while its two bonded elements stay the same.
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Question 3
A student sees only the slower rate and concludes that the chlorine bond was replaced with a weaker bond. Evaluate the claim using the supplied model.
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A mixed display contains some P molecules and some Q molecules. A detector can resolve both model vibration rates separately.
Question 4
Predict which rates it should show. Explain why an average reading of 10.5 would not be a third molecular model.
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