1. fuel cells produce a potential difference when..
- the fuel is oxidised within the fuel cell
- the fuel is reduced within the fuel cell
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2. why are other cells rechargeable?
- the chemical reaction involved is reversible
- they can be reused
- there are always free ions available
3. 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
4. why are some cells non-rechargeable?
- the reactants do not stay in the cell after being used
- the chemical reactions stop after one of the reactants is used up
- they can only be used once
5. fuel cells are supplied by...
- an external source of fuel, and oxygen or air
- an external source of fuel, or oxygen, or air
- an internal source of fuel, and oxygen or air
- an external source of fuel, and hydrogen gas