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importanta si utilizarea oxigenului

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by

maria lavinia

on 16 January 2014

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Transcript of importanta si utilizarea oxigenului

Proprietati chimice
Importanta si utilizareaoxigenului
Utilizari
In stare libera
Importanta oxigenului
Proprietati fizice
Despre Oxigen

descperit de Carl Wilhelm Scheele
in anul 1772
si de Joseph Priestley
in anul 1774
Simbol : O2
Reprezinta 21% din aer
Element esential pentru supravietuire
Cel mai raspandit element de pe planeta
Se gaseste in stare libera dar si in compusi
In aerul atmosferic 21 %
In compusi : -apa
-oxizi
-saruri
-sub forma de minereuri
-plante
-animale
Este un gaz :
Incolor
Inodor ( fara miros)
Insipid (fara gust)
Partial solubil
Are densitatea mai amre decat aerul
Oxidarile pot fii :
1. Lente - au loc in timp indelungat
-nu au loc cu degajarea de caldura si lumina
2.Vii : - au loc in timp scurt
-au loc cu degajarea de lumina si caldura
Este utilizat in diferite domenii :
medicina
rachete
intretine viata
pentru sudarea metalelor
obtinerea otelului
Full transcript