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Comparing Attraction in Two Ionic Contacts 4 questions
Comparing Attraction in Two Ionic Contacts
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
An exhibit shows a model of neighboring ions in three solids. The model compares one pair at a time. Opposite charges attract. For pairs with the same charge magnitudes, a smaller separation gives a stronger attraction.
| Pair | Positive ion charge | Negative ion charge | Center-to-center separation (model units) |
|---|---|---|---|
| J | +2 | −2 | 3 |
| K | +2 | −2 | 4 |
| L | +1 | −1 | 3 |
Question 1
Which pair of records isolates a difference in separation while keeping both charges fixed?
- J and K
- J and L
- K and L
- All three records together
Question 2
Compare the attractions in J and K. Use the charge and separation evidence.
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A student proposes using the separation rule alone to compare K and L. In that comparison both charge magnitude and separation differ.
Question 3
Explain why the stated distance rule alone does not settle that comparison.
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Question 4
A student reverses the sign of the negative charge in model J and keeps everything else fixed. What happens to the direction of the interaction? Explain.
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