cl.7 ,, Substanțe pure și amestecuri,,
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Chemistry
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Professional Development
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Practice Problem
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Substanța pură este alcătuită din:
atomi, molecule, ioni din aceeași clasă de substanțe
atomi, molecule, ioni de aceeași substanță
atomi, molecule, ioni de diferite substanțe
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Amestecurile conțin
atomi, molecule, ioni de aceeași substanță
atomi, molecule, ioni de diferite substanțe
atomi, molecule, ioni de substanțe lichide
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
În calitate de amestec natural poate fi:
Apa distilată
Apa de izvor
Sticla
Creta
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Amestec omogen este:
apa cu sare
apa cu ulei
apa cu aer
apa cu cretă
5.
OPEN ENDED QUESTION
1 min • Ungraded
Scrie un exemplu de amestec neomogen
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6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Evaporarea, filtrarea, sedimentarea sînt metode de:
formarea amestecurilor
prelucrarea amestecurilor
separarea amestecurilor
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
decantarea este metodă de separare a:
amestecurilor omogene
amestecurilor eterogene
a substanțelor solide
a substanțelor gazoase
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