Petrol and ethene are both obtained from crude oil - VCE - SSCE Chemistry - Question 7 - 2002 - Paper 1
Question 7
Petrol and ethene are both obtained from crude oil.
a. Name the process by which petrol is obtained from crude oil.
b. i. Name the process by which ethene is obtai... show full transcript
Worked Solution & Example Answer:Petrol and ethene are both obtained from crude oil - VCE - SSCE Chemistry - Question 7 - 2002 - Paper 1
Step 1
Name the process by which petrol is obtained from crude oil.
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Answer
The process by which petrol is obtained from crude oil is called fractional distillation.
Step 2
Name the process by which ethene is obtained from the hydrocarbons extracted from crude oil.
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Answer
The process by which ethene is obtained from the hydrocarbons extracted from crude oil is called cracking.
Step 3
Write a chemical equation for the production of ethene from this process, using octane, C₈H₁₈, as the hydrocarbon.
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The chemical equation for the production of ethene from cracking octane (C₈H₁₈) can be represented as:
C8H18(g)→C2H4(g)+C6H14(g)
Step 4
What is meant by unsaturated?
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In organic chemistry, unsaturated refers to compounds that contain at least one double bond or triple bond between carbon atoms. This means that these compounds can react with additional atoms or groups of atoms, allowing for the possibility of more complex structures.
Step 5
Write a balanced equation to show the burning of ethene in a large excess of air.
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The balanced equation for the complete combustion of ethene (C₂H₄) in a large excess of air is:
C2H4(g)+3O2(g)→2CO2(g)+2H2O(g)
Step 6
Write a chemical equation to show ethene undergoing an addition reaction.
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Answer
An example of an addition reaction involving ethene is its reaction with hydrogen (H₂) to form ethane (C₂H₆). The chemical equation for this process is:
