Paraffin oil contains a mixture of high molecular mass alkanes - VCE - SSCE Chemistry - Question 5 - 2007 - Paper 1
Question 5
Paraffin oil contains a mixture of high molecular mass alkanes. A gaseous mixture of ethene and other low molecular mass alkanes and alkenes can be produced in the l... show full transcript
Worked Solution & Example Answer:Paraffin oil contains a mixture of high molecular mass alkanes - VCE - SSCE Chemistry - Question 5 - 2007 - Paper 1
Step 1
What is the general name given to this process?
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Answer
The general name for this process is cracking, specifically thermal or catalytic cracking.
Step 2
Suggest the likely function of the alumina.
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Answer
Alumina acts as a catalyst in this reaction, increasing the rate at which the molecules break down into smaller alkanes and alkenes.
Step 3
If one of the components of paraffin oil is C17H36, write a balanced equation in which this component forms ethene and only one other product.
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The balanced equation for the conversion of C17H36 to ethene (C2H4) can be represented as follows:
C17H36→C2H4+C15H32
where C15H32 represents another alkane.
Step 4
addition of bromine (Br2)
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The balanced equation for the addition of bromine to ethene is as follows:
C2H4+Br2→C2H4Br2
Step 5
complete combustion
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The balanced equation for the complete combustion of ethene is:
C2H4+3O2→2CO2+2H2O
Step 6
heated with steam and a catalyst at 300°C
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The balanced equation for the reaction of ethene with steam, facilitated by a catalyst, is:
C2H4+H2O→C2H5OH
This reaction produces ethanol.
Step 7
Draw the structural formulas of compounds A and B.
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Compound A and B can be represented as follows:
Compound A:
Structural Formula:
![A: Structural Formula Here]
Systematic Name: 1,2-dibromoethane
Compound B:
Structural Formula:
![B: Structural Formula Here]
Systematic Name: 1,1-dibromoethane
Step 8
Draw the structural formula of compound C.
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Compound C, the acidic compound, can be represented as follows: