Bonding

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  • Created by: Ikram
  • Created on: 15-04-13 12:00
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  • BONDING
    • IONIC
      • Metals lose electrons. Non metals gain.
      • High melting points
      • Ions are free to move when molten so they carry electric current
      • Strong electrostatic forces of attraction
    • METTALIC
      • Free electrons
        • conduct heat + electricity
        • hold the atoms together in a regular structure
        • Strong electrostatic forces of attraction
        • Allow layers to slide over each other so the metal can be bent
      • Alloys
        • Different sized atoms so the layers are distorted and they can't slide over each other
    • COVALENT
      • GIANT COVALENT
        • Very high melting + boiling points
          • Don't conduct electricity
            • Graphite - 3 covalent bonds, slide over each other, pencil lead
              • Silica - Sand, each grain is a giant structure of silicon and oxygen
                • Diamond - 4 covalent bonds, rigid, hardest natural substance, drill tips
      • SIMPLE MOLECULAR
        • Weak forces of attraction
          • Low melting + boiling points
  • Most are gases and liquids at room temp
    • Low melting + boiling points
    • Don't conduct electricity because there are no ions
  • Silica - Sand, each grain is a giant structure of silicon and oxygen
    • Diamond - 4 covalent bonds, rigid, hardest natural substance, drill tips

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