Apentix/AP Chemistry/Unit 9: Applications of Thermodynamics/Question
AP Chemistrymediummcq1 pt

While a car battery is being recharged, what kind of electrochemical cell is it operating as, and why?

A.An electrolytic cell, because the charger forces the discharge reaction to run backward
B.A galvanic cell, because the same electrodes and acid remain in place
C.A concentration cell, because internal ion gradients supply the charging current
D.A fuel cell, because energy streams in continuously

Explanation

Core Concept

Discharging is spontaneous with negative ΔG, so recharging must drive the exact reverse process, which is nonspontaneous. The external charger pushes current backward through the battery, swapping which electrode acts as anode and cathode, exactly how an electrolytic cell operates. Unplugged again, the battery reverts to galvanic behavior whenever it delivers current.

Correct Answer

AAn electrolytic cell, because the charger forces the discharge reaction to run backward

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