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Perkaratan besi
4Fe(s) + 3O2(g) 2Fe2O3(s)
Oksidasi glukosa dalam tubuh
C6H12(ag) + 6O2(g) 6CO2(g) + 2H2O
Pembakaran gas alam
CH4(g) + 2O(g) CO2(g) + 2H2O(l)
Contoh:
Fe2O3(s) + 3CO(s) 2Fe(s) + 3CO2(g)
Reduksi tembaga oleh oksigen
CuO(s) + H2(g) Cu(s) + H2O(g)