O LevelChemistryCambridgeExam Questions11. Organic Chemistry11.3. Fuels

. Fuels (Cambridge O Level Chemistry)

Exam Questions

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11.3. Fuels

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11.3. Fuels

1a4 marks

Natural gas, which is mainly methane, is a fossil fuel.

 
i)
What is meant by the term fuel?
 
[1]
 
ii)
Name two other fossil fuels.
 
[2]
 
iii)
Name a solid fuel which is not a fossil fuel.
 
[1]

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1b4 marks
Fossil fuels are formed by the anaerobic decomposition of organic matter. Anaerobic means in the absence of oxygen.
 
i)
The organic matter contains hydrogen and carbon. Suggest the products that would be formed if the decomposition occurred in the presence of oxygen.
 
[2]
 
ii)
What are the two main disadvantages in the widespread use of fossil fuels?
 
[2]

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2a2 marks

A major source of energy is the combustion of fossil fuels.

i)
Name a solid fossil fuel.
 
[1]
 
ii)
Name a gaseous fossil fuel.
 
[1]

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2b5 marks
Petroleum is separated into more useful fractions by fractional distillation.
 

i)
Name two liquid fuels obtained from petroleum.
 
........................................ and ........................................
 
[2]
 
ii)
Name two other useful products obtained from petroleum that are not used as fuels.
 
........................................ and ........................................
 
[2]
 
iii)
Give another mixture of liquids that is separated on an industrial scale by fractional distillation.
 
[1]

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