Transition elements

Need to know:

• Appearance and uses of transition elements

• Thermal decomposition of transition metal carbonates - equations

• Identification of TM ions using precipitation

Compounds of transition elements

Copper sulphate Iron II sulphate Iron III oxide

Compounds of transition elements are often ________

This makes them good for . . . .

Compounds of transition elements

Copper sulphate Iron II sulphate Iron III oxide

Compounds of transition elements are often coloured

This makes them good for pigments and dyes

Transition elements and their compounds can also be used as a

e.g.

Iron in the Haber process

Nickel in the manufacture of margarine

Thermal decomposition of carbonates of transition elements

Note:Colour change

Copper carbonate → ______ _____+ _____ _______

Thermal decomposition of carbonates of transition elements

Note:Colour change

Copper carbonate → copper oxide + carbon dioxide

video

http://www.google.co.uk/url?sa=i&rct=j&q=thermal+decomposition&source=images&cd=&cad=rja&docid=BnX3KVh5M32bWM&tbnid=nfMzb0HPhl5oDM:&ved=0CAUQjRw&url=http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel/materials_from_earth/calcium_carbonaterev3.shtml&ei=sTBKUe_fCuuY0QWStoGQCg&bvm=bv.44011176,d.d2k&psig=AFQjCNG-FdkvZWqFwN3GCyd8-kBgcMOYEA&ust=1363903020553170

Try these equations for thermal decomposition. . .

• Iron carbonate →

• Copper carbonate →

• Manganese carbonate →

• Zinc carbonate →

Try these equations for thermal decomposition. . .

• Iron carbonate → iron oxide + carbon dioxide

• Copper carbonate → copper oxide + carbon dioxide

• Manganese carbonate → manganese oxide + carbon dioxide

• Zinc carbonate → zinc oxide + carbon dioxide

Try these equations for thermal decomposition. . .

• 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

How can you identify transition metal ions?

Precipitation reactions

Colour of precipitates

formed

Transition metal ions in solution

Precipitate formed when mixed with sodium hydroxide

solution

Colour of the precipitate

Cu2+ Copper hydroxide Blue

Fe2+ Iron(II)hydroxide Grey/green

Fe3+ Iron(III)hydroxide Orange/red

video

Extension : write balanced ionic equations for the precipitation reactions

Cu2+ + OH- →

Fe2+ + OH- →

Fe3+ + OH- →

Extension : write balanced ionic equations for the precipitation reactions

Cu2+ + 2OH- → Cu(OH)2

Fe2+ + 2OH- → Fe(OH)2

Fe3+ + 3OH- → Fe(OH)3

Need to know:

• Appearance and uses of transition elements

• Thermal decomposition of transition metal carbonates - equations

• Identification of TM ions using precipitation