Land and its resources

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  • 1. Minerals in the Earth’s Crust
  • 2. Elements in the Earth’s crust
  • 3. Gold
    Silver
    Platinum
    Natural elements
  • 4. Natural compounds- oxides
    Haematite –
    iron oxide
    Cassiterite –
    tin oxide
  • 5. Natural compounds - carbonate
    Calcite –
    calcium carbonate
    Malachite –
    copper carbonate
  • 6. Natural compounds - sulphides
    Iron pyrite –
    Iron sulphide
    Galena –
    Lead sulphide
  • 7. Hardness of minerals
    Solubility of minerals in water
    Action of heat on minerals
    Properties of minerals
  • 8. Can be measured using Mohs’ scale
    The hardest is diamond (10)
    The softest is talc (1)
    Hardness of minerals
  • 9. Most minerals are insoluble in water
    Only oxides, sulphates and carbonates of potassium and sodium are soluble in water
    Solubility in water
  • 10. Most metal oxides are stable, do not break down when heated, except less reactive metals.
    Mercuric oxide mercury +
    oxygen
    Effect of heat
  • 11. Very hard except oxides of potassium, sodium, calcium and magnesium
    Donot dissolve in water
    Do not decompose on heating except mercury oxide
    Metal oxides
  • 12. Break down into metal oxide and sulphur dioxide when heated
    Iron sulphide iron oxide +
    sulphur dioxide
    Sulphur dioxide bleaches acidified potassium manganate(VII) solution from purple to colourless
    Metal sulphide
  • 13. Metal carbonate break down into metal oxide and carbon dioxide when heated
    Calcium carbonate calcium oxide +
    carbon dioxide
    Metal carbonates