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Question

Give reasons for the following:

The reaction of Iron (III) oxide[Fe2O3] with heated Aluminium is used to join cracked machine parts.


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Solution

Reaction between Iron(III) oxide and Aluminium:

  • The reaction taking place between Fe2O3 and Aluminium (Al)is a thermite reaction.
  • This is an exothermic reaction, which generates a great amount of heat and results in the formation of molten iron metal, which is used to join the rails.
  • The reaction proceeds as follows:

Fe2O3(s)Iron(III)Oxide+2Al(s)AluminiumAl2O3(s)Aluminiumoxide+2Fe(l)MoltenIron+Heat

Thus, The reaction of iron (III) oxide[Fe2O3] with heated aluminium is used to join cracked machine parts.


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