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Tracking Bridge Ions as a Cell Runs 4 questions
Tracking Bridge Ions as a Cell Runs
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A cell model uses a zinc electrode in one compartment and a copper electrode in another. Electrons move through a wire. A bridge supplies positive and negative ions to the liquids. In the model the bridge offsets the liquid charge changes without adding zinc or copper ions.
Zn → Zn2+ + 2 e-
Cu2+ + 2 e- → Cu
| Compartment record | Count in one interval |
|---|---|
| Zn2+ added to the zinc liquid | 3 |
| Cu2+ removed from the copper liquid | 3 |
Question 1
What charge change in the zinc liquid must the bridge offset?
- −6 charge units
- −3 charge units
- +3 charge units
- +6 charge units
Question 2
Use the two liquid changes to explain which sign of bridge ion must enter each compartment.
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One bridge supplies +1 ions and −1 ions. A second bridge supplies +1 ions and −2 ions. Assume the liquid changes are the same in both runs and that the bridge ions do not react.
Question 3
Compare how many negative bridge ions enter the zinc compartment with the two bridges.
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Question 4
A student says the second bridge must allow fewer electrons through the wire because it sends fewer negative particles into the zinc liquid. Evaluate the claim.
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