CAIE IGCSE Chemistry 4.2 Hydrogen Oxygen Fuel Cells Topic Practice

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Question 1

[Maximum number: 1]

Hydrogen is used as a fuel in rockets and is also used in hydrogen fuel cells.
Which statements are correct?
1 Both uses produce water vapour.
2 Burning hydrogen produces polluting gases.
3 A fuel cell produces electricity.

A

1, 2 and 3

B

1 and 3 only

C

1 only

D

2 and 3 only

Question 2

[Maximum number: 1]

Which statement about fuels is correct?

A

Heat energy is only produced by burning fuels.

B

Hydrogen is used as a fuel although it is difficult to store.

C

Methane is a good fuel because it produces only water when burned.

D

Uranium is burned in air to produce energy.

Question 3

[Maximum number: 1]

Which equation represents a reaction that takes place in a fuel cell?

A

C+O2→CO2\mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}

B

2H2+O2→2H2O2 \mathrm{H}_{2}+\mathrm{O}_{2} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}

C

CH4+2O2→CO2+2H2O\mathrm{CH}_{4}+2 \mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}+2 \mathrm{H}_{2} \mathrm{O}

D

C3H8+5O2→3CO2+4H2O\mathrm{C}_{3} \mathrm{H}_{8}+5 \mathrm{O}_{2} \rightarrow 3 \mathrm{CO}_{2}+4 \mathrm{H}_{2} \mathrm{O}

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