The thermite reaction,
Fe2O3 + Al S Al2O3 + Fe
produces so much heat that the Fe product melts. This reaction
is used industrially to weld metal parts under water,
where a torch cannot be employed. It is also a favorite chemical
demonstration in the lecture hall (on a small scale).
(d) If you performed the reverse reaction— aluminum oxide
plus iron makes iron oxide plus aluminum—would that
reaction have heat as a reactant or a product?
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Master Endothermic & Exothermic Reactions with a bite sized video explanation from Jules Bruno