
SP10 Chimie
Authored by Defne Guzey
Chemistry
10th Grade
Used 3+ times

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12 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Lorsque 90g de X et 45 g de Y réagissent, 75 g de Z et une certaine quantité de T se forment. 15 g de Y reste en excès. Combien grammes de T se forme?
15
30
45
60
2.
FILL IN THE BLANK QUESTION
1 min • 5 pts
La loi de la conversation de la masse est énoncée par
3.
MULTIPLE CHOICE QUESTION
3 mins • 5 pts
On fait réagir 73 g de HCl sur 100 g de Zn impur. On obtient 95 g de ZnCl2 et 2 g de H2. Trouver la pourcentage d'impureté de Zn.
20
24
28
32
4.
FILL IN THE BLANK QUESTION
3 mins • 5 pts
Dans le composé X4Y3, le rapport des masses mx/my=3/1. Si la masse molaire du composé est 144 g, quelles sont est la masse atomique de X?
5.
FILL IN THE BLANK QUESTION
3 mins • 5 pts
Le 48% du composé XaY4 est l'élément X. On sait que Mx=32 My=26. Que vaut "a"?
6.
FILL IN THE BLANK QUESTION
2 mins • 5 pts
Le composé CaX2 contient 20% de calcium. Quelle est la masse atomique de X? (Ca: 40)
7.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
A la suite de la réaction en pleine d'efficacité de 40 g de A et de certaine quantité de Y, 120 g de AY3 est formé. 20 g de Y reste en excès. Quel est le pourcentage de Y qui ne réagit pas?
%20
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%30
%35
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