C4f- The Transition Elements

C4f- The Transition Elements

1. Colours of Transition Metals Compounds

   • Copper- Blue
   • Iron (II)- Light Green
   • Iron (III)- Orange/Brown

2. Transition Elements and their compounds are often used as Catalysts

   • Iron in Haber Process
   • Nickel in the Manufacture of Margarine

3. Thermal Decomposition

   • Metal Carbonate --> Metal Oxide + Carbon Dioxide
   • IN ALL OF THESE REACTIONS A COLOUR CHANGE OCCURS, A METAL OXIDE AND CARBON DIOXIDE IS PRODUCED
   • Iron Carbonate  Iron Oxide + Carbon Dioxide FeCO3  FeO +CO2
   • Copper Carbonate  Copper Oxide + Carbon Dioxide CuCO3  CuO +CO2
   • Manganese Carbonate  Manganese Oxide + Carbon Dioxide MnCO3  MnO +CO2
   • Zinc Carbonate  Zinc Oxide + Carbon Dioxide ZnCO3  ZnO +CO2

4. Precipitation Reactions

   • Sodium Hydroxide solution is used to identify the presence of a transition metal ion in solution. The solids formed are called PRECIPITATES
   • Cu2+ - Blue
   • Fe2+ - Grey/Green
   • Fe3+ - Orange/Brown
   • MN+ + NOH- --> M(OH)N
   • Cu2+ +2OH- -->Cu (OH) 2
   • Fe2+ + 2OH- -->Fe (OH) 2
   • Fe3+ + 3OH- Fe (OH) 3