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
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Periodicity of Period 3 Oxides: Properties, Reactions, and Bonding, Slides of Chemistry
A comprehensive analysis of Period 3 oxides, including their formulas, pH values, nature, and species present in water. It also covers the balanced equations for their reactions with water, acids, and bases, as well as explanations for their amphoteric or basic properties. The document concludes with an explanation of the bonding present in each oxide.
What you will learn
- What is the nature of Na2O and why does it have a pH of 14 when it reacts with water?
- Why does Al2O3 display amphoteric properties and how does this relate to the ions present?
- Explain the observation that SiO2 maintains a pH of 7 in water and how this relates to its structure and bonding.
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2021/2022
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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.