Elements, Mixtures And Compounds

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  • 1. Elements, mixtures and compounds By the end of the lesson you should be able to:
    • Recognise and classify elements, mixtures and compounds
    • Recall some chemical symbols
    • Write word/symbol equations
    • Give some uses of rock salt
    • Describe how rock salt is purified
  • 2. Starter
    • Work in pairs
    • Sort the cards so into 6 rows. Each row should have in it:
      • A picture (at the start)
      • A card that says what that picture shows
      • A card that explains your choice (at the end)
      • e.g.
    THIS PICTURE IS AN ELEMENT BECAUSE ALL THE ATOMS ARE THE SAME
  • 3. 8E Making marvellous molecules!
  • 4. Word and Symbol Equations
    • An equation is short way of describing a chemical reaction
    • E.G. When carbon reacts with oxygen, carbon dioxide is made
    • Carbon + Oxygen  Carbon dioxide
    • C + O 2  CO 2
    Reactants Products
  • 5. Separating Rock Salt Crush Rock Salt Add Water Filter mixture Evaporate Water Salt is left behind
  • 6. Uses of Salt Pure Salt Rock Salt De-icing Roads Electrolysis Food use, dyeing, dishwasher salt, preservatives, bath salts Solvay Process Sodium Carbonate Making glass, soaps, paper, dyes Hydrogen – fuel, making margarine Sodium Hydroxide - making paper, soaps, fibres, detergents Chlorine – killing germs in water, bleaches