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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