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

What most distinguishes a hydrogen-oxygen fuel cell from an ordinary primary battery?

A.Reactants are fed continuously from outside, so output lasts as long as fuel is supplied
B.It burns hydrogen in a combustion chamber to spin a generator
C.Its voltage climbs steadily as discharge proceeds
D.All of its reactants are sealed inside at manufacture

Explanation

Core Concept

A fuel cell is still galvanic: the overall reaction 2 H₂ + O₂ → 2 H₂O is spontaneous and delivers a current. The difference is architectural, because H₂ and O₂ stream in from external tanks while water exits as the product. Capacity is limited by fuel supply rather than by what fits inside the casing, unlike sealed batteries with finite stored reagents.

Correct Answer

AReactants are fed continuously from outside, so output lasts as long as fuel is supplied

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