Page 24 - Analytical Chemistry I E-book

d) Combustion reaction :
it is a reaction in which a substance reacts with oxygen, usually with
the rapid release of heat to produce a flame. The products include
one or more oxides, i.e. oxygen changes oxidation number from 0 to -
2.
e) g.
1- Organic compounds burn in O2 or air to yield CO2 & H2O
2C4H10 (g) + 13O2 (g) → 8CO2 (g) + 10H2O(l)

2- Many metals burn in air, too, such as Fe wool
4Fe (s) + 3O2 (g) → 2 Fe2O3 (s)