AP Environmental Science : Hydrogen and Fuel Cells

Study concepts, example questions & explanations for AP Environmental Science

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Example Questions

Example Question #1 : Hydrogen And Fuel Cells

Which of the following is NOT a drawback of utilizing hydrogen as a fuel source?

Possible Answers:

The input of energy to produce hydrogen is often greater than the energy of the resulting hydrogen.

Existing infrastructure for manufacturing and transporting hydrogen is minimal to nonexistent.

Hydrogen has a low energy density by volume.

Hydrogen has a low energy density by weight.

Hydrogen is very challenging and dangerous to transport.

Correct answer:

Hydrogen has a low energy density by weight.


Hydrogen is very challenging to transport and it requires a large energy investment to produce it. While hydrogen has a low energy density by volume, it actually has a very high energy density by weight. This has to do with the fact that hydrogen, discussed in this context, is a gas.

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