Thermite Reaction

 A Thermite Reaction is when iron oxide and aluminum undergo reduction oxidation and form iron and aluminum oxide. The reaction is so exothermic that is melts the iron thus making it useful for underwater welding on pipelines.

The Reaction:

Fe₂O₃(s) + 2 Al(s) Al₂O₃(s) + 2 Fe(l)

Iron Oxide plus Aluminum gives Aluminum oxide and Iron

Another Single Replacement Reaction:

Zn + CuCl₂  ZnCl₂ + Cu

Zinc plus Copper Chloride gives Zinc Chloride and Copper