chemical changes

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  • Chemical Changes
    • Reactions of metals and acids
      • Oxydation =   gaining oxygen            Reduction = losing oxygen
      • When a metal reacts with an acid it produces a salt plus hydrogen gas
        • metal + acid / salt + hydrogen
        • The salt produced depends on the kind of metal and type of  acid used in the reaction
          • hydrochloric acid = metal chloride
          • sulfuric acid = metal sulfate
          • nitric acid = metal nitrate
      • metal carbonate: metal carbonate + acid / salt + carbon dioxide +water
      • metal oxide: metal oxide + acide / salt + water
    • a more reactive metal will displace a less reactive metal from its compound
    • in group 1 all the elements have just one electron on the outer shell.
      • as you go down the group the elements get more reactive
    • Extraction of metals
      • an ore is a type of of rock that contains sufficient minerals with importantelements including metals
      • iron ore = hermatite  aluminium ore =  bauxtite   coppeer ore =  malachitr
      • Electrolysis
        • as ionic compounds are made of charged ions, they can conduct electricity but only if the can move
          • if it's molten or dissolved it can move
        • anions are positively charged while cations are negatively charged
        • metal ions are positively charged so are attracted to the cation and non-metal ions are negatively charged so are attracted to the anion


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