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 contains... 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 of large molecules that consist 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 form long chains of repeating units through a process known as polymerization. In this process:

The double bond in the ethene molecule breaks, allowing the molecule to link with other ethene molecules.
This linking process continues, resulting in a long chain of repeating ethylene units, creating a polymer, such as polyethylene.

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