
Grandeurs
Quiz
•
Chemistry
•
4th Grade
•
Practice Problem
•
Hard
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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Combien d'atomes y a-t-il dans la molécule de Ca3(PO4)2 ?
3
5
11
13
Answer explanation
Il y a 3 atomes Calcium, 2 atomes Phosphore et 8 atomes Oxygène, soit 13 atomes au total
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Quel est le volume de 2 moles de dioxygène dans les CNTP ?
22,4 L
44,8 L
11,2 L
Answer explanation
n = 2 mol
Vm (CNTP) = 22,4 L/mol
V = n.Vm = 2.22,4 = 44,8 L
3.
MULTIPLE CHOICE QUESTION
2 mins • 2 pts
Quelle est la masse de 3 moles de dioxyde de carbone ?
44,01 g
132,03 g
88,02 g
Answer explanation
M(CO2) = 44,01 g/mol
m = n.M = 3.44,01 = 132,03 g
4.
MULTIPLE CHOICE QUESTION
2 mins • 2 pts
Quelle est la quantité de matière contenue dans 90 g d'eau ?
4,99 mol
0,2 mol
10 mol
Answer explanation
M(H2O) = 18,02 g/mol
n = m/M = 90/18,02 = 4,99 mol
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Combien d'atomes contiennent 2 moles de sodium ?
6.1023 atomes
1,2.1024 atomes
3.1023 atomes
Answer explanation
n = 2 mol
N = n.NA = 2.6.1023 = 1,2.1024 atomes
6.
MULTIPLE CHOICE QUESTION
3 mins • 3 pts
On dissout 8,5 g de chlorure de sodium dans 250 mL d'eau.
Quelle est la concentration molaire de la solution ?
0,25 mol/L
0,60 mol/L
0,34 mol/L
Answer explanation
m = 8,5 g
V = 0,25 L
M(NaCl) = 58,44 g/mol
n = m/M = 8,5/58,44 = 0,15 mol
c = n/V = 0,15/0,25 = 0,6 mol/L
7.
MULTIPLE CHOICE QUESTION
3 mins • 3 pts
On veut préparer 1,5 L d'une solution de sulfate de cuivre (II) de 0,2 mol/L.
Quelle masse de soluté doit-on peser ?
23,9 g
31,9 g
47,89 g
Answer explanation
V = 1,5 L
C = 0,2 mol/L
M(CuSO4) = 159,62 g/mol
n = C.V = 0,2.1,5 = 0,3 mol
m = n.M = 0,3.159,62 = 47,89 g
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