Why is the displacement reaction of Aluminium with Iron Oxide used for welding?
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This reaction is called Thermite reaction. Thermite reaction is used to join cracked iron parts of machines. A mixture of iron oxide Fe2O3 and aluminum powder. When it is ignited the aluminum powder reacts with the O3 part of Fe2O3 in a highly exothermic reaction, the resulting product is molten iron. Thermite is commonly used in welding, because the molten iron has the ability to seep into cracks in metal.
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It is used to produce white hot molten (liquid) iron in remote locations for welding. A lot of heat is needed to start the reaction, but then it releases an incredible amount of heat, enough to melt the iron. Because aluminium is more reactive than iron, it displaces iron from iron(III) oxide. ... aluminium is oxidised......
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