Question

Why the reaction of Fe2o3 with aluminium is used to join cracked iron parts of machines

Answer 1

Hi !

Thermite reaction :-

It is the reduction of metal oxide to form metal , by using aluminium powder as a reducing agent.

These reaction (metal oxide with aluminium) are highly exothermic(large amount of heat is released ).

Due to the large amount of heat produced , the metals are produced in molten state.

This reduction property of aluminium is used in welding broken pieces of heavy iron objects like railway tracks.

Here is the chemical reaction that takes place,

Fe₂O₃ + 2Al     -----> 2Fe + Al₂O₃

Here , molten iron is formed ,which is poured between the broken iron pieces to weld them.

Answer 2

Answer:

Here the Iron is poured into the broken parts or the crevices so as to seal them. As iron hardens after some time all those cracks and crevices would be fixed!

Hope this helps you!

:)