Periodicity of Period 3 Oxides: Properties, Reactions, and Bonding, Slides of Chemistry

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11. Periodicity

Periodicity 11. 11.1 Period 3 oxides summary 11.2 Reactions of Period 3 oxides 11.3 Structure and bonding in Period 3 oxides

11.1. Period 3 oxides summary

Periodicity 11.1. Complete the diagram showing the formulae of the period 3 oxides, their pH in water, the nature of the oxide and the species present in the solution. Oxide pH in water Nature of oxide Species present in water Na 2 O 14 Basic MgO Al 2 O 3 - SiO 2 Acidic - P 4 O 10 SO 2 SO 3 0 H 2 SO 4

11.3. Structure & bonding in Period 3 oxides

Periodicity 11.3.

1. Complete the table to show the bonding present in the period 3 oxides. Oxide Na 2 O MgO Al 2 O 3 SiO 2 P 4 O 10 SO 2 SO 3 Bonding (4 marks) (a) Explain why Al 2 O 3 displays amphoteric properties with reference to the ions present. (2 marks) (b) In water, SiO 2 maintains a pH of 7. With reference to the structure and bonding in SiO 2 explain this observation. (1 mark) (c) Na 2 O reacts with water to give a solution with a pH of 14 whereas MgO reacts with water to give a solution with a pH of 10. Write equations for both reactions and explain the observed differences in pH. (3 marks)

11. Answers

Periodicity answers.

Oxide pH in water Nature of oxide Species present in water Na 2 O 14 Basic NaOH MgO 10 Mg(OH) 2 Al 2 O 3 7 Amphoteric - SiO 2 7 Acidic - P 4 O 10 0 H 3 PO 4 SO 2 3 H 2 SO 3 SO 3 0 H 2 SO 4 11.