Poly(butene) is a polymer made from crude oil in two stages - AQA - GCSE Chemistry - Question 7 - 2014 - Paper 1
Question 7
Poly(butene) is a polymer made from crude oil in two stages.
The first stage in making poly(butene) is to break down large hydrocarbon molecules from crude oil into... show full transcript
Worked Solution & Example Answer:Poly(butene) is a polymer made from crude oil in two stages - AQA - GCSE Chemistry - Question 7 - 2014 - Paper 1
Step 1
7 (a) (i) The products contain two types of hydrocarbon with different general formulae. Name the two types of hydrocarbon.
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Answer
The two types of hydrocarbon are alkanes and alkenes.
Step 2
7 (a) (ii) Describe the conditions in the reactor.
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The conditions in the reactor include high temperatures ranging from 300 °C to 900 °C, and the presence of a catalyst or steam to facilitate the reaction.
Step 3
7 (a) (iii) Suggest why air must not enter the reactor.
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Air must not enter the reactor because oxygen can react with the hydrocarbons, potentially causing an explosion.
Step 4
7 (a) (iv) Suggest a method that can be used to separate butene (C₄H₈) from the other hydrocarbons.
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Fractional distillation can be used to separate butene (C₄H₈) from the other hydrocarbons.
Step 5
7 (b) (i) Draw the displayed structure of a butene (C₄H₈) molecule.
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The displayed structure of a butene (C₄H₈) molecule is:
H H
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H - C - C = C - C - H
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H H
Step 6
7 (b) (ii) Describe how molecules of butene (C₄H₈) form poly(butene).
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Molecules of butene (C₄H₈) form poly(butene) through a process called polymerization, where many butene monomers undergo a reaction to join together, forming long chains or very large molecules.
