11. Periodicity

11. Periodicity

11. Periodicity 11.1 Period 3 oxides summary 11.2 Reactions of Period 3 oxides 11.3 Structure and bonding in Period 3 oxides Periodicity 11. 11.1. Period 3 oxides summary 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 O 14 Basic 2 MgO Al O - 2 3 SiO Acidic - 2 P O 4 10 SO 2 SO 0 H SO 3 2 4 Periodicity 11.1. 11.2. Reactions of Period 3 oxides Write balanced equations for the following reactions illustrating the reactions of period 3 oxides with water, acids and bases. 1. Phosphorus oxide with water 2. Sulfur dioxide with water 3. Sulfur trioxide with water 4. Sodium oxide with hydrochloric acid 5. Magnesium oxide with sulphuric acid 6. Aluminium oxide with sulphuric acid 7. Aluminium oxide with sodium hydroxide 8. Silicon dioxide with sodium hydroxide 9. Phosphorus oxide with sodium hydroxide 10. Sulphur dioxide with sodium carbonate Periodicity 11.2. 11.3. Structure & bonding in Period 3 oxides 1. Complete the table to show the bonding present in the period 3 oxides. Oxide Na O MgO Al O SiO P O SO SO 2 2 3 2 4 10 2 3 Bonding (4 marks) (a) Explain why Al O displays amphoteric properties with reference to the ions present. (2 marks) 2 3 (b) In water, SiO maintains a pH of 7. With reference to the structure and bonding in SiO explain this 2 2 observation. (1 mark) (c) Na O reacts with water to give a solution with a pH of 14 whereas MgO reacts with water to give a 2 solution with a pH of 10. Write equations for both reactions and explain the observed differences in pH. (3 marks) Periodicity 11.3. 11. Answers 11.1 Oxide pH in water Nature of oxide Species present in water Na O 14 Basic NaOH 2 MgO 10 Mg(OH) 2 Al O 7 Amphoteric - 2 3 SiO 7 Acidic - 2 P O 0 H PO 4 10 3 4 SO 3 H SO 2 2 3 SO 0 H SO 3 2 4 11.2 Periodicity answers. 11. Answers 11.3 Oxide Na O MgO Al O SiO P O SO SO 2 2 3 2 4 10 2 3 Bonding (Giant) ionic (Giant) ionic with (Giant) covalent (Simple) covalent covalent character macromolecular molecular 3+ (a) Al ion is small and highly charged (1 mark) and polarises the oxide ion (1 mark) (b) SiO has a covalent macromolecular structure so is insoluble in water (1 mark) 2 (c) Na O + H O 2NaOH (1 mark) MgO + H O Mg(OH) (1 mark) MgO is only sparingly soluble/is 2 2 2 2 less soluble (1 mark) Periodicity answers. .

View Full Text

Details

  • File Type
    pdf
  • Upload Time
    -
  • Content Languages
    English
  • Upload User
    Anonymous/Not logged-in
  • File Pages
    6 Page
  • File Size
    -

Download

Channel Download Status
Express Download Enable

Copyright

We respect the copyrights and intellectual property rights of all users. All uploaded documents are either original works of the uploader or authorized works of the rightful owners.

  • Not to be reproduced or distributed without explicit permission.
  • Not used for commercial purposes outside of approved use cases.
  • Not used to infringe on the rights of the original creators.
  • If you believe any content infringes your copyright, please contact us immediately.

Support

For help with questions, suggestions, or problems, please contact us