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Tracking Copper Under a Silver Deposit 4 questions
Tracking Copper Under a Silver Deposit
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class studies a model in which dissolved silver ions meet a copper strip. Silver atoms collect on the strip while copper atoms enter the solution as Cu2+. The model assumes the deposited silver stays attached and no other solid changes mass.
Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s)
Question 1
Which change in the equation represents oxidation?
- Ag⁺ becomes Ag.
- Cu becomes Cu²⁺.
- Ag⁺ gains an electron.
- Cu²⁺ becomes Cu.
Question 2
Explain why two silver ions are needed for each copper atom that becomes Cu²⁺.
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In one model run, 0.0100 mol of copper leaves a strip that initially weighs 10.00 g. Use molar masses of 63.5 g/mol for Cu and 107.9 g/mol for Ag.
Question 3
Predict the final mass of the strip with its attached silver. Show how both the copper loss and silver gain enter the calculation.
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Question 4
A student argues that an increase in the strip’s total mass proves no copper left it. Explain why the result does not establish that claim.
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