Question
Hydrogen fuel cells can be used to power cars.
Which statements about a fuel cell are correct?
1 The balanced equation for the reaction is H2 + O2 = H2O.
2 The fuel cell generates electricity.
3 In the fuel cell hydrogen is reduced.
4 The reactants are gases at room temperature.
A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4
Answer/Explanation
Ans: C
Question
Which equation represents a reaction that takes place in a fuel cell?
A \(C + O_2 \rightarrow CO_2\)
B \(2H_2 + O_2 \rightarrow 2H_2O\)
C \(CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O\)
D \(C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O\)
Answer/Explanation
Ans: B
Question
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
Answer/Explanation
Ans: B
Question
Which statement about the hydrogen fuel cell is not correct?
A. Chemical energy is converted into electrical energy.
B. Hydrogen is oxidised.
C. The reaction that takes place is endothermic.
D. Water is the only product.
Answer/Explanation
Ans:
C