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Properties of Compounds - Ionic, Covalent and Metallic
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Properties of Compounds - Ionic, Covalent and Metallic

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  • 1. Recap, we have learnt
    • 2 types of bonds exist between compounds
    • Covalent Bonds
    • - Electrons are shared
    • Ionic Bonds
    • - Electrons are Transferred
    - Balancing charges
  • 2.
    • (D) Properties of Ionic Compounds:
    • made of crystals
    • have high melting points
    • often soluble in water
    • conduct electricity in water
  • 3. They are crystalline solids 2D Image
  • 4. Why do ionic compounds have high melting points? Opposite charges attract , forming strong ionic bonds . Thus a lot of energy is needed to separate the ions.
  • 5. Why do ionic compounds dissolve in water? The electrons in H 2 O molecule are not evenly spread. One end of the molecule is slightly negative compared to the other end.
  • 6.
    • The water molecules are attracted to the ions and pull them from the giant structure.
    • The compound dissolves.
    • Its ions are now free to move around  able to conduct electricity.
  • 7.
    • Electrical Conductivity:
    • Ionic compounds when solid do not conduct electricity .
    • The ions are tightly held in place in the lattice structure and are unable to carry charges.
    • However, when molten or dissolved in water , they can conduct electricity because the crystal lattice has broken down and the ions can move .
    Do covalent compounds dissolve and conduct electricity too?
  • 8.
    • (D) Metallic Bonding
    • Metals generally have the following properties:
    • High melting and boiling points
    • Conduct electricity and heat
    • Hard and dense
    • Can be hammered into shapes ( malleable )
    • Can be drawn out into wires ( ductile )
  • 9. Metal atoms (or ions) are held together by a sea of electrons. Each metal atom gives up electrons from its outer shell into the sea or cloud of electrons .
  • 10. These free electrons explain how electricity can pass through solid metals.
  • 11. Lets Compare the 3 types of compounds – Covalent, Ionic & Metallic
    • Watch the video and answer these questions
    • Covalent Compound
    • = Naphthalene
    • Ionic Compound
    • = NaCl
    • Metallic Compound
    • = Tin
  • 12. Questions : Copy these onto your notes
    • Which substance conducts electricity when solid?
    • Which substance conducts when dissolved in water?
    • Which substance does not dissolve in water?
  • 13. Summary
    • Today we have touched on
    • The properties of ionic compounds
    • Metallic bonding (sea of electrons)
    • Some differences between the 3 types of compounds.

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