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Paraffin oil contains a mixture of high molecular mass alkanes - VCE - SSCE Chemistry - Question 5 - 2007 - Paper 1

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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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Answer

The balanced equation for the conversion of C17H36 to ethene (C2H4) can be represented as follows:

C17H36C2H4+C15H32C_{17}H_{36} \rightarrow C_{2}H_{4} + C_{15}H_{32}

where C15H32 represents another alkane.

Step 4

addition of bromine (Br2)

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Answer

The balanced equation for the addition of bromine to ethene is as follows:

C2H4+Br2C2H4Br2C_{2}H_{4} + Br_{2} \rightarrow C_{2}H_{4}Br_{2}

Step 5

complete combustion

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Answer

The balanced equation for the complete combustion of ethene is:

C2H4+3O22CO2+2H2OC_{2}H_{4} + 3O_{2} \rightarrow 2CO_{2} + 2H_{2}O

Step 6

heated with steam and a catalyst at 300°C

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Answer

The balanced equation for the reaction of ethene with steam, facilitated by a catalyst, is:

C2H4+H2OC2H5OHC_{2}H_{4} + H_{2}O \rightarrow C_{2}H_{5}OH

This reaction produces ethanol.

Step 7

Draw the structural formulas of compounds A and B.

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Answer

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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Answer

Compound C, the acidic compound, can be represented as follows:

  • Compound C:

    • Structural Formula:

    ![C: Structural Formula Here]

    • Systematic Name: Propanoic acid

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