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GCSE
Gcse Science
Chemistry - Hydrocarbons And Fuels (Aqa)
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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?
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Global dimming
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Global warming
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Acid rain
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Ozone depletion
Q.2
Which of these is the correct equation for the complete combustion of propane?
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CH4 + 2O2 → CO2 + H2 O
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2C2 H4 + 6O2 → 2CO2 + 2H2 O
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C3 H8 + 5O2 → 3CO2 + 4H2 O
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2C3 H8 + 7O2 → 6CO + 8H2 O
Q.3
Which of the following is a product of burning hydrocarbons as fuels?
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Carbon monoxide
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Water vapour
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Oxygen
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Carbon dioxide
Q.4
During the combustion of hydrocarbons, what happens to the carbon and hydrogen atoms?
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They change into new elements
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They are destroyed completely
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They are reduced
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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?
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72
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44
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36
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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?
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Because it is a solid
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Because it is a liquid
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Because it is a gas
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Because it is not possible to burn it
Q.7
Soot is mainly particles of what?
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Unburned hydrocarbons
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Sulfur
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Carbon
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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?
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Carbon monoxide
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Carbon dioxide
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Methane
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Sulfur dioxide
Q.9
Which of the following is an alkane?
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C2H2
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C4H6
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C6H12
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C8H18
Q.10
What is a hydrocarbon?
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A compound containing only hydrogen and carbon
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A compound containing mainly hydrogen and carbon
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A compound containing only hydrogen, carbon and oxygen
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The only type of chemical that we ever use as a fuel
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