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Petrol and alternative fuels
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How is petrol obtained from crude oil?
By fractional distillation
In a petrol engine the mixture is ignited by a ____?
spark
What
used
to be added to petrol to stop the mixture auto-igniting?
Lead
What did auto-igniting cause the engine to do?
"knock"
The naptha fraction is ________ to produce the mixture of hydrocarbons needed to add to petrol?
reformed
What kind of molecules are found in petrol?
Alkanes, branched chain alkanes, cycloalkanes and aromatics
In petrol, why are smaller molcules used in winter than in summer?
As they need to evaporate more easily in the colder temperatures
Are fossil fuels finite or infinite?
Finite
What are the four alternative fuels?
Methanol, ethanol, biogas and hydrogen
How is ethanol made?
This is made by fermenting sugar cane
Is ethanol renewable?
Yes
Give one advantage and one disadvantage of methanol
Advantages
Carbon monoxide emissions are reduced
Benzene vapour or other aromatic hydrocarbons are not released into the air
Methanol is relatively cheap
Methanol is less volatile and so less likely to explode in a car collision
Disadvantages
Methanol is toxic
Methanol produces less energy than petrol
Methanol absorbs water to produce a corrosive mixture
It is difficult to get methanol to mix with petrol
How is biogas made?
This is made by anaerobic respiration / incomplete fermentation of some biological matter like plant and animal waste eg manure and straw
How can hydrogen be obtained?
By electrolysing water (using solar power)
What is the main advantage of burning hydrogen?
It only produces water when burned
Author
Anonymous
ID
117243
Card Set
Petrol and alternative fuels
Description
Higher Chemistry - Petrol and alternative fuels
Updated
11/16/2011, 5:41:28 PM
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