Apentix/AP Chemistry/Unit 9: Applications of Thermodynamics/Question

AP Chemistrymediummcq1 pt

During steady operation of a Daniell cell (Zn|Zn²⁺||Cu²⁺|Cu), what happens to the two electrode masses?

A.The zinc anode loses mass while the copper cathode gains mass

B.Both electrodes steadily gain mass

C.The zinc anode gains mass while the copper cathode loses mass

D.Neither mass changes because electrons merely pass through

Explanation

Core Concept

At the anode, Zn(s) → Zn²⁺(aq) + 2 e⁻ pulls zinc atoms off the strip into solution, shrinking its mass. At the cathode, Cu²⁺(aq) + 2 e⁻ → Cu(s) plates dissolved copper onto its strip, growing it. Equal charge flows through both electrodes, so after scaling by molar masses, zinc lost matches copper gained.

Correct Answer

AThe zinc anode loses mass while the copper cathode gains mass

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