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2.3 Properties of materials

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Question 15

In a cooling system, one mole of a simple molecular substance, R, changes from a liquid to a gas at its boiling point.

ChangeEnergy transferred for one mole of R (kJ)
Liquid R to gaseous R24
Breaking all the covalent bonds within the R molecules690
a.

Explain why the data do not support the claim that covalent bonds break when R boils.

[2]
b.

A second simple molecular substance, S, has larger molecules than R.

Explain which substance has the higher boiling point at the same pressure.

[2]
Markscheme

2.3 Properties of materials Questions

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

122 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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