Q.1
When we use hydrocarbons as fuels they produce particulates (small particles of solids e.g. soot). What environmental problem is caused by the release of these solids?
  • Global dimming
  • Global warming
  • Acid rain
  • Ozone depletion
Q.2
Which of these is the correct equation for the complete combustion of propane?
  • CH4 + 2O2 → CO2 + H2 O
  • 2C2 H4 + 6O2 → 2CO2 + 2H2 O
  • C3 H8 + 5O2 → 3CO2 + 4H2 O
  • 2C3 H8 + 7O2 → 6CO + 8H2 O
Q.3
Which of the following is a product of burning hydrocarbons as fuels?
  • Carbon monoxide
  • Water vapour
  • Oxygen
  • Carbon dioxide
Q.4
During the combustion of hydrocarbons, what happens to the carbon and hydrogen atoms?
  • They change into new elements
  • They are destroyed completely
  • They are reduced
  • They are oxidised
Q.5
16g of methane required 64g of oxygen to burn completely producing 44g of carbon dioxide. How many grams of water were produced?
  • 72
  • 44
  • 36
  • 22
Q.6
Some properties of hydrocarbons depend on the size of their molecules. These properties influence how hydrocarbons are used as fuels. A hydrocarbon with 30 carbon atoms is unlikely to be used as a fuel in vehicles. Why not?
  • Because it is a solid
  • Because it is a liquid
  • Because it is a gas
  • Because it is not possible to burn it
Q.7
Soot is mainly particles of what?
  • Unburned hydrocarbons
  • Sulfur
  • Carbon
  • Solidified nitrogen oxides
Q.8
There are environmental costs when using hydrocarbons as fuels. Using them in this way produces a number of pollutants. Which one of the following contributes to acid rain?
  • Carbon monoxide
  • Carbon dioxide
  • Methane
  • Sulfur dioxide
Q.9
Which of the following is an alkane?
  • C2H2
  • C4H6
  • C6H12
  • C8H18
Q.10
What is a hydrocarbon?
  • A compound containing only hydrogen and carbon
  • A compound containing mainly hydrogen and carbon
  • A compound containing only hydrogen, carbon and oxygen
  • The only type of chemical that we ever use as a fuel
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