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Chemistry

 Sērs un slāpeklis
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ID number:876007
 
Author:
Evaluation:
Published: 10.12.2006.
Language: Latvian
Level: Secondary school
Literature: 2 units
References: Not used
Extract

Īpašības.
Sērs ir dzeltena kristāliska viela, kas ūdenī praktiski nešķīst, bet labi šķīst benzolā, toluolā, sērogleklī, anilīnā. Parastajos apstākļos sēra atomi veido molekulas S8, kurām ir vainaga veids. Šīs molekulas izveido rombiskus vai adatveida kristālus. Tie ir sēra stabilākie alotropiskie veidi.
Ja izkausētu sēru ielej aukstā ūdenī, iegūst brūnu, staipīgu, gumijai līdzīgu masu – plastisko sēru, jo S8 molekulu gredzeni karsējot deformējas vai pārtrūkst. …

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