Chemistry Unit C1 Worksheet - Study And Revision Pack (Foundation Paper) Page 31
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34Q3.
Fuels
The graph shows how the percentage of carbon dioxide in the atmosphere has changed over the
last 220 000 years.
(a) (i) Describe how the percentage of carbon dioxide has changed over the last 40 000 years.
(2)
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(ii) The percentage of carbon dioxide in the atmosphere has increased over the last 100 years.
Suggest a reason for this increase.
(1)
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(b) Alternative fuels, such as bioethanol, are being developed to replace fossil fuels, such as
petrol.
(i) Which of the following statements about petrol is true?
Put a cross ( ) in the box next to your answer.
A burning petrol does not release energy
B petrol availability is limited
C petrol burns to form hydrogen
D when petrol is burned, no carbon dioxide is formed
(1)
(ii) Bioethanol is a biofuel.
Describe why it is an advantage to use bioethanol rather than petrol as a fuel for car engines.
(2)
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