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5 marksStructure and Bonding

CSEC Chemistry · May/June 2016 · Paper 2 · Question 4(c)

Sodium chloride and calcium oxide both have similar giant ionic crystalline structures with high melting points. However, the melting point of calcium oxide is higher than that of sodium chloride. Sketch the lattice structure for sodium chloride and suggest why its melting point would be lower than that of calcium oxide.

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  1. 4(a)Graphite and diamond are two allotropes of carbon. Define the term 'allotrope'. Illustrate your answer by drawing the lattice structures for both diamond and…[6 marks]
  2. 4(b)(i)Describe the bonding present in metals.[2 marks]
  3. 4(b)(ii)Explain, in terms of bonding, why graphite conducts electricity but diamond does NOT conduct electricity.[2 marks]

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