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.
1, 2 and 3
1 and 3 only
1 only
2 and 3 only
B
Which statement about fuels is correct?
Heat energy is only produced by burning fuels.
Hydrogen is used as a fuel although it is difficult to store.
Methane is a good fuel because it produces only water when burned.
Uranium is burned in air to produce energy.
B
Which statement about electrolysis is correct?
Electrons move through the electrolyte from the cathode to the anode.
Electrons move in the external circuit towards the cathode.
Negative ions move in the external circuit towards the anode.
Positive ions move through the electrolyte towards the anode.
B
Which substance is not produced during the electrolysis of concentrated aqueous sodium chloride?
chlorine
hydrogen
sodium
sodium hydroxide
C