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2.3 Properties of materials

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Question 18
F

Ethene, C2H4\mathrm{C_{2}H_{4}}C2​H4​, is a gas at room temperature. Poly(ethene) is made from ethene and is a solid at room temperature.

Both substances contain only covalent bonds.

Which statement explains why poly(ethene) is a solid but ethene is a gas?

[1]
A

Poly(ethene) is a giant covalent structure, so strong covalent bonds must be broken to melt it.

B

Poly(ethene) molecules are very long, so the intermolecular forces between them are much stronger than those between ethene molecules.

C

The covalent bonds in poly(ethene) are stronger than the covalent bonds in ethene, because ethene has a double bond.

D

Poly(ethene) contains ionic bonds between its chains, which hold the chains together in a solid.

Markscheme

2.3 Properties of materials Questions

  1. GCSE
  2. /Chemistry
  3. /2.3 Properties of materials

60 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.

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