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Covalent bonding

Covalent bonding

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Question 5

This question is about different allotropic structures of carbon: diamond and Buckminsterfullerene (C60\text{C}_{60}C60​).

a.

Name the type of chemical bond that exists between the carbon atoms within both diamond and Buckminsterfullerene.

[1]
b.

Explain, in terms of structure and bonding, why diamond has an extremely high melting point.

[2]
c.

Buckminsterfullerene has a simple molecular structure. Explain why it sublimes at a much lower temperature than diamond melts.

[2]
d.

Diamond and graphite are two different crystalline forms of carbon. They can be interconverted according to the equation:

C(diamond)⇌C(graphite)ΔH=−1.9 kJ/mol \text{C}(\text{diamond}) \rightleftharpoons \text{C}(\text{graphite}) \quad \Delta H = -1.9 \text{ kJ/mol} C(diamond)⇌C(graphite)ΔH=−1.9 kJ/mol

Would a low or a high temperature favour the conversion of diamond into graphite? Give a reason for your choice.

[2]
Markscheme

Covalent bonding Questions

  1. IGCSE
  2. /Chemistry
  3. /Covalent bonding

15 exam-style questions on Edexcel IGCSE Chemistry Covalent bonding. Each one has a worked solution and a mark scheme showing where the marks go.

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