Elemente si combinatii chimice
Elemente si combinatii chimice
Elemente si combinatii chimice
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Burns<br />
Some elements reacts energetically with oxygen with<br />
relea<strong>si</strong>ng of a lot of heat and light (live burns). These<br />
reactions are even more violent in pure O2 than are in<br />
air. From nonmetals, phosphorus, carbon and sulfur<br />
burns ea<strong>si</strong>ly in O2, and between metals Mg, Al, Fe (when<br />
are heat to incandescence).<br />
Burn of fos<strong>si</strong>l coals and of hydrocarbons is the main<br />
source of heating.<br />
Burn of H2 or hydrocarbons with O2 or air is a explo<strong>si</strong>ve<br />
reaction (the mechanism is of chain-reaction type,<br />
through free atoms and radicals, with a initiation phase<br />
with spark or flame).
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