chemical bonding, structure and properties

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  • Created by: Nadia
  • Created on: 22-12-12 17:08
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  • chemical bonding, structure and properties
    • metals, ionic compounds, simple molecular covalent substances and giant covalent substances have different properties
      • 'sea' of delocalised electrons  /lattice of positive ions have structural model for metals explain their physical properties
    • the electronic structure of atoms can help to explain how ions are formed
      • dot and cross diagrams  can show how ionic bonding takes place in simple binary compounds formed from group 1/2 and 6/7 elements
        • dot and cross diagrams can show the covalent bonding in simple molecules including double bonds
      • the structural model for giant ionic structures explain the physical properties of ionic substances
      • electronic structure of atoms can help explain the physical properties of simple molecular substances
      • intermolecular bonding structural model for simple molecular structures can explain the physical properties of simple molecular substances
    • the structures +properties of diamond, graphite  and carbon nanotubes can be described in terms of their bonding and structure
    • the properties and uses of carbon nanotubes relate to their bonding and structure
    • smart materials have properties which change reversibly to a stimulus (change) in the enviornment
      • thermochromic pigments change colour with changing temperature
      • photochromic pigments change colour with changing light intensity
      • hydrogels absorb/expel water and shrink/swell up to 1000x their volume due to changes in pH or temperature
      • shape-memory alloys regain their original shape when heated
      • shape-memory polymers regain their original shape when heated
      • uses of smart materials depend on their properties

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