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Importanta si utilizarile Oxigenului!

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Georgiana Dragomir

on 24 November 2013

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Transcript of Importanta si utilizarile Oxigenului!

Oxigenul
Oxigenul este un element chimic din tabelul periodic avand simbolul O si numarul atomic 8. Este un gaz.
Oxigenul (O2) reprezinta 21% din aer si este un element esential pentru supravietuirea tuturor vietuitoarelor de pe Pamant. Exista totusi bacterii care pot trai fara prezenta oxigenului (de exemplu, bacteriile sulfuroase).
Image by Tom Mooring
Importanta si utilizarile Oxigenului!
Importanta oxigenului pentru mentinerea vietii


Intrebuintari!
Oxigenul intretine viata si arderea. Se utilizeaza in medicina, aparat autonom de respirat sub apa in circuit inchis pentru scafandri de lupta, albirea tesaturilor, sudura, taierea metalelor, sinteza acizilor, motoare, obtinerea experimentelor.
Oxigenul a fost descoperit ca element chimic in anul 1771 de catre englezul Joseph Priestly. Peroxidul de hidrogen a fost descoperit in 1818 de catre chimistul francez Louis Jacques Thenard.
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