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ID number:566378
 
Author:
Evaluation:
Published: 13.06.2011.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

Ka kaitigais kimiskais faktors izplatitakas neorganiskas vielas ir metali, metaloidi un to
savienojumi, neorganiskas gazes, skabes un sarmi, neorganiskie halogenu savienojumi.
Atseviška grupa ir mazškistošie silicijsaturošie putekli, kas galvenokart tiek aiztureti elpcelos,
kur paradas to kaitiga iedarbiba. Metali ir vielas ar stabilizetu katjonu un neitralu atomu
strukturu, ko sava starpa saista brivie (kopigie) elektroni. To raksturigakas ipašibas ir metalisks
spidums, cietiba, laba elektrovaditspeja un siltumvaditspeja. Metaloidi pec savam fizikalam
ipašibam ir lidzigi metaliem, bet savienojumos tie veido kovalento saiti. Parasti ir sastopama šo
elementu metaliska un nemetaliska modifikacija, tipiskakie parstavji – bors, silicijs, arsens,
selens. Metali un metaloidi var ieklut organisma, tos galvenokart ieelpojot puteklu un dumu
veida dažados parstrades un metalapstrades procesos, ari kalnrupnieciba, celtniecibas darbos un
kimiska rupnieciba.
Svins ir viens no izplatitakajiem toksiskiem metaliem. Ar to saskaramies dažadas
ražošanas.…

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