During the cracking of alkanes from crude oil, one of the products is:
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an alcohol
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an aldehyde
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an alkene
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an alkyne
Q.2.
Which of the fractions of oil is most often used to manufacture chemicals instead of being used as a fuel?
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Petrol
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Naptha
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Kerosene
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Residue
Q.3.
Ethanol can be added to petrol used in car engines. Why is this?
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It makes cars travel faster
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It is a good way of getting rid of the ethanol that we don't need
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It makes the fuel easier to burn than just using petrol on its own
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It burns more cleanly, reducing air pollution
Q.4.
What is the test used to detect an alkene and what is the result?
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Limewater/cloudy
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Litmus paper/bleached
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Bromine water/colourless
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Universal indicator/brown
Q.5.
What is the general formula for any alkene?
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CnH2n
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C2nHn+2
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CnH2n+2
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CnH2
Q.6.
Which of the following represents a carbon to carbon double bond in an alkene?
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CxC
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--CC
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C-d-C
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C=C
Q.7.
Why is the residue fraction often used for cracking?
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It is too sticky to use for anything else
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The molecules are very small
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It is the cheapest thing to do with it
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There is more produced than is used
Q.8.
Read the following passage. Which answer gives the missing words in the correct order? There are two good reasons for cracking oil __________. Firstly, there just aren't enough fuels like petrol or _________ in the original crude oil to meet demand. Secondly, _______ that are needed to manufacture other chemicals are found in oil but can be made from it. Cracking means the vast majority of crude oil can be turned into useful products and not just burnt as ______.
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portions, ethanol, alkanes, fuels
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fractions, diesel, alkenes, fuels
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elements, diesel, alkanes, water
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compounds, petrol, alkenes, hydrogen
Q.9.
Ethanol can be made by fermenting plants or from the ethene obtained by cracking crude oil. What would be a of making it from oil?
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It comes from a renewable source
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It comes from a non-renewable source
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It contains more impurities
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It doesn't mix as easily with petrol as the ethanol from plants
Q.10.
What is the key difference between the alkanes and the alkenes that are produced by cracking, and what is the cause?
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Alkenes are much more reactive as they are unsaturated
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Alkanes are much more reactive as they are suturated
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Alkenes have a smell because their chemical bonds are weak
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Alkenes are all coloured compounds because they polarise the light passing through them
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