Thermite
 

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A thermite reaction (a type of aluminothermic reaction) is one in which aluminium metal is oxidized by the oxide of another metal, most commonly iron oxide. The name thermite is also used to refer to a mixture of two such chemicals. The products are aluminium oxide, free elemental iron, and a great deal of heat. The reactants are commonly powdered and mixed with a binder to keep the material solid and prevent separation.

Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(s);    ΔH = -851.5 kJ/mol