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Importanta si utilizarile oxigenului

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campean lorena

on 8 January 2014

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Transcript of Importanta si utilizarile oxigenului

Importanta si utilizarile oxigenului
Oxigenul
- sbol chimic : O
-1 mol O = 16 g
-pozitii in S.P : -grupa a-VI-a A
-perioada a-2-a
-caracter electrochimic: electronegativ
-caracter chimic: nemetal
-valenta: 2
-formula chimica : O2 - molecula atomica
-exista 3 izotopi
Importanta oxigenului pentru mentinerea vietii
reprezinta 21 % din aer
element esential pentru supravietuirea tuturor vietuitoarelor de pe Pamant
bacterii care pot trai fara oxigen : bacterii sulfuroase
Proprietati fizice
* ambalarea in atmosfera modificata
*pastrarea si transportul pestelui
* imbogatirea aerului si cresterea temperaturilor de combustie in furnalele deschise
* inlocuirea sau imbogatirea aerului, marind temperaturile de combustie in productia
metalelor feroase si neferoase
* a mari capacitatea si eficienta distructiva a incineratoarelor de reziduuri
*a imbunatati combustia in cuptoarele de sticla, reducand emisiile de oxid azotic
(NOx)
*pentru resuscitare sau, in combinatie cu alte gaze, pentru anesteziere
*pentru transformarea carbunelui in electricitate

incolor
inodor
insipid
putin solubil in apa
de 1,1 ori mai greu decat aerul
se lichefiaza foarte greu
Full transcript