Giant Ionic Structures

  • Created by: LShahid3
  • Created on: 12-09-18 21:35
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  • Giant ionic structures
    • It takes a lot of energy to break up a giant lattice structure- there are strong ionic bonds to break.
      • To separate the ions to have to overcome all the electrostatic forces of attraction in all directions.
        • This                       means that ionic compounds have high melting a boiling points. They are all solids at room temperature.
      • Once enough energy is supplied to separate the ions from the lattice, they become mobile- this is when an ionic solid becomes liquid.
        • They are attracted to oppositely charged electrodes in the molten compound.
          • Therefore, they can carry the electrical charge through the liquid.
        • A solid ionic compound cannot conduct electricity when because it's ions are in fixed positions and cannot move- they can only vibrate on the spot.
      • Many ionic compounds dissolve in water and when dissolved, the lattice is split up by water molecules.
        • Then, the ions are free to move in the solution formed, they can carry their charge to the opp. electrodes in the solution. Solutions of ionic compounds will also conduct electricity.
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    • Ionic solid:        - ions in fixed position, vibrate but cannot move   - it does not conduct electricity
    • Molten ionic compound       - high temperature gives enough energy to overcome strong attractive forces between ions- ions are free to move around in the molten compound       - it does conduct electricity
    • Ionic compound in water solution   - water molecules separate ion from lattice, makes them free to move around in the solution             - does conduct electricity
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