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Amestecuri

Corpuri, energie, lumină

TermDefinition
amestec prin punerea împreună(combinarea) a două sau mai multe substanțe
amestec omogen substanța obținută are aceleași proprietăți și aceeași compoziție în toată masa ( saramura-apă+ sare, siropul- apă +zahăr, apă +oțet)
amestec neomogen fiecare substanță din amestec își păstrează aceeași structură și aceleași proprietăți (apă + ulei, apă + pietriș)
Metode de separare a amestecurilor decantare filtrare cristalizare magnetizare distilare
decantare scurgerea lichidului dintr-un amestec neomogen ( apă+nisip), după ce particulele respective s-au separat de apă, depunându-se pe fundul vasului
filtrare trecerea amestecului printr-un filtru ( separarea plantelor din ceaiuri, strecurarea supelor, separarea resturilor menajere din chiuvetă de apa care se scurge)
cristalizare separarea unei substanțe sub influența căldurii, sub formă de cristale (separarea sării din apa de mare, fabricarea zahărului în instalații speciale)
magnetizare separarea unor obiecte din fier din amestecuri cu ajutorul magneților
distilare separarea substanțelor dintr-un amestec prin fierbere(vaporizare), urmată de condensare ( obținerea alcoolului, a benzinei, motorinei)
Created by: PLory
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