Este adevarata afirmatia:
Solutii. Concentratia

Quiz
•
Chemistry
•
7th Grade
•
Hard
OANA MUNTEANU
Used 207+ times
FREE Resource
12 questions
Show all answers
1.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Concentratia procentuala reprezinta cantitatea de substanta dizolvata in 1000 grame solutie;
Masa solutie se noteaza cu md
md reprezinta masa dizolvantului
Concentratia procentuala are urmatoarea relatie de calcul:
c% = md*100/ms
2.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Intr-un pahar Berzelius cu apă se adaugă o spatulă de pilitură de fer şi una de zahăr.
Separarea celor două substanţe se realizează prin
filtrare si cristalizare
decantare si cristalizare
distilare si filtrare
magnet si fitrare
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
In functie de masa dizolvatului masa solutiei poate fi scrisa ca fiind suma dintre :
md + m apa
ms + m apa
md + ms
4.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Soluţiile sunt amestecuri omogene formate din 2 sau mai multe substanţe între care………….fenomene chimice
Au loc
Nu au loc
5.
MULTIPLE SELECT QUESTION
2 mins • 1 pt
In 600 g solutie se gasesc 50 g sare de bucatarie. Concentratia solutiei este:
83%
8,33%
83,3%
8%
6.
MULTIPLE SELECT QUESTION
2 mins • 1 pt
Calculeaza concentratia procentuala obtinuta prin dizolvarea a 65 g zahar in 135 g apa.
3,25%
65%
32,5%
7.
MULTIPLE SELECT QUESTION
3 mins • 1 pt
Calculeaza masa de substanta dizolvata necesara pentru a obtine 500 g solutie de concentratie 50 %.
250g
25g
0,25Kg
2,5 kg
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