Molecules of plastics are long chains of repeating units. (i) Complete the sentence by putting a cross (X) in the box next to your answer. A substance that contains molecules that are long chains of repeating units is A an alkene B a biofuel C a polymer D a salt (ii) Describe how ethene molecules can form molecules that are long chains of repeating units.

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Molecules of plastics are long chains of repeating units - Edexcel - GCSE Chemistry - Question 4 - 2018 - Paper 1

Question 4

Molecules of plastics are long chains of repeating units. (i) Complete the sentence by putting a cross (X) in the box next to your answer. A substance that contain... show full transcript

Worked Solution & Example Answer:Molecules of plastics are long chains of repeating units - Edexcel - GCSE Chemistry - Question 4 - 2018 - Paper 1

Step 1

Complete the sentence by putting a cross (X) in the box next to your answer.

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Answer

The correct answer is C: a polymer. Polymers are substances made up of long chains of repeating units, which is characteristic of plastics.

Step 2

Describe how ethene molecules can form molecules that are long chains of repeating units.

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Answer

Ethene molecules can bond together to form long chains through a process called polymerization. In this process, the double bonds in the ethene monomers break apart, allowing the individual ethene molecules to link together. This leads to the formation of a polymer, where numerous ethene units connect to create a large macromolecule.

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