Chemical Classification

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  • chemical classification
    • ionic substances
      • bonding
        • atoms gain or lose electrons to form ions
        • strong bonds between ions
      • electricity
        • conduct when molten or dissolved in water
          • ions can move around
        • don't conduct when solid
      • melting and boiling points
        • high
          • strong forces holding ions together
        • solid at room temp
      • solubility
        • many dissolve in water
    • simple molecular substances
      • bonding
        • atoms share electrons to gain full outer shell
        • strong bonds between atoms in molecules
        • weak forces between separate molecules
      • electricity
        • dont conduct
          • no charged particles that can move
      • melting and boiling points
        • low
          • weak forces of attration between molecules
        • most are liquid or gas at room temp
      • solubility
        • some dissolve in water
    • giant molecular covalent substances
      • bonding
        • atoms share electrons to gain full outer  shell
        • strong bonds between all atoms
      • melting and boiling points
        • high
          • strong forces between atoms
          • solids at room temp
    • metals
      • bonding
        • positive ions held together by sea of delocalised electrons
        • strength is different in different meals
      • electricity
        • conduct
          • when solid and liquid
          • delocalised electrons can move between ions
      • melting and boliing points
        • medium to high
        • all metals are solids at room temp
      • insoluble
    • classifying substances
      • melting point
        • liquid or gas = simple molecular covalant substance
        • if a substance is solid, heat on a bunsen
          • substance melts easily = simple molecular covalent
          • substance takes longer to melt = metal or giant molecular covakent substance
          • cannot be melted = giant ionic substance
      • conducting electricity
        • use battery bulb and wires
          • if it conducts electricity = metal or graphite
          • doesn't conduct then dissolve in water
            • if it dissolves and conducts = ionic substance

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