Combustion reactions always involve molecular oxygen O2. Anytime anything burns (in the usual sense), it is a combustion reaction. Combustion reactions are almost always exothermic (i.e., they give off heat). For example when wood burns, it must do so in the presence of O2 and a lot of heat is produced:
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Combustion - Wikipedia, the free encyclopedia
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Combustion or burning is the sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species. The release of heat ca...
en.wikipedia.org/wiki/Combustion
Gas chromatography using a 6' molecular sieve column was then employed to separate and identify the products of the combustion reactions in an attempt to determine the mass balance for each of the various reaction mixtures.
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The combustion reactions commonly seen on the AP exam are reactions of hydrocarbons (C, H) or C, H, O compounds in excess oxygen. There have also been reactions of nonmetal hydrides with oxygen or metal sulfides.
intro.chem.okstate.edu/AP/Combustion.html intro.chem.okstate.edu/AP/Combustion.html
Combustion turns out to be a complex interaction between molecules—even the burning of a simple five-atom molecule can involve more than 100 individual chemical reactions.
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Combustion reactions occur when compounds rapidly combine with oxygen and require some kind of ignition like a flame. Other Tips: Seven frequently used elements occur naturally as diatomic molecules: H2, O2, N2, Cl2, Br2, I2.
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Combustion reactions of methane, hydrogen, hexane, and natural gas in chlorine are demonstrated. ... Combustion of Methane ... Methane combustion in balloons, a Bunsen burner flame, and methane combustion in chlorine are demonstrated.
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Real-time synchrotron diffraction has been used to monitor the phase transformations of highly exothermic, fast self-propagating solid combustion reactions on a subsecond time scale down to 100 milliseconds and in some instances to 10 milliseconds.
www.sciencemag.org/cgi/content/abstract/249/4975/1406
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