Download - презентация1 molec
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Cea mai mica particula dintr-o substanta, care
mai pastreaza proprietatile substantei din care
face parte se numeste MOLECULA.
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CUM SE FORMEAZA MOLECULELE ?
Prin punere in comun de electroni.
( Clorul isi pune in comun un electron deci are covalenta 1.)
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CUM SE CLASIFICA MOLECULELE ?
CRITERII:Dupa felul atomilor: molecule formate din atomi identici; molecule formate din atomi diferiti;Dupa numarul atomilor: molecule monoatomice; molecule diatomice; molecule poliatomice;
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Unde sunt situate in SP gazele rare ?
Precizati o caracteristica a atomilor gazelor rare.
Exemple:
Moleculele gazelor rare
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H
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este o macromolecula.
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PROPRIETATILE MOLECULELOR
-particule materiale;
-neutre din punct de vedere electric;
-au masa si dimensiuni reduse;
-sunt in continua miscare (miscarea browniana);
-intre molecule exista spatii intermoleculare;
-participa la reactii chimice;
-intre molecule se exercita forte de coeziune.
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Miscarea browniana
Este o miscare dezordonata;
Viteza de miscare depinde de temperatura.
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Miscarea moleculelor explica fenomenul de
DIFUZIUNE.
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