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6. why are hydrogen fuel cells good for the environment?
- cheap
- does not require electrical energy
- fewer dangerous chemicals
- lower energy use
7. what does a chemical cell contain?
- a nucleus, cytoplasm and cell membrane
- chloroplasts, vacuole and cell wall
- chemicals which react to produce electricity
- chemicals which react to produce gases
8. fuel cells are supplied by...
- an external source of fuel, or oxygen, or air
- an external source of fuel, and oxygen or air
- an external source of fuel, and hydrogen gas
- an internal source of fuel, and oxygen or air
9. fuel cells produce a potential difference when..
- the fuel is oxidised within the fuel cell
- the fuel is reduced within the fuel cell