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Question 2
Medium
a.

Silicon dioxide (SiO2\text{SiO}_2SiO2​), iodine (I2\text{I}_2I2​), and poly(ethene) all contain covalent bonds.

Diagram showing three different chemical structures. Structure 1 represents a giant covalent network of silicon dioxide, with silicon atoms bonded tetrahedrally to four oxygen atoms. Structure 2 represents diatomic iodine molecules consisting of pairs of covalently bonded iodine atoms. Structure 3 represents polymer chains of poly(ethene), with long parallel chains of carbon atoms bonded to hydrogen atoms.

Explain which substance has the highest melting point. Use your knowledge of structure and bonding to support your answer.

[5]
b.

Sodium chloride is an ionic compound. Explain why ionic compounds can conduct electricity when dissolved in water, but not when solid.

[2]
c.

Construct the dot and cross diagram for the ions in sodium oxide, Na2O\text{Na}_2\text{O}Na2​O. Show the outer electron shells only.

[2]

Bonding Questions

  1. GCSE
  2. /Chemistry
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