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Checking Current Through a Coated Strip 4 questions
Checking Current Through a Coated Strip
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A display uses a metal strip covered by a thin coating. The class places two electrical contacts at opposite ends. The model can expose the metal at either contact without changing the metal between the contacts. Each test uses the same voltage.
| Test | Metal exposed at left contact | Metal exposed at right contact | Current detected |
|---|---|---|---|
| P | No | No | No |
| Q | Yes | No | No |
| R | Yes | Yes | Yes |
Question 1
Which pair isolates the effect of exposing metal at the right contact while the left is already exposed?
- P and Q
- P and R
- Q and R
- All three together
Question 2
Explain why test P alone cannot establish that the metal inside the strip fails to conduct.
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Question 3
A student says removing the coating at just one end is enough to measure the metal’s conduction. Evaluate the claim using Q and R.
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Question 4
Describe a separate test of whether the coating by itself carries current in the model.
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