
RAN Chimie 24/10/2023
Authored by Germain Boissonnet
Chemistry
University
Used 1+ times

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5 questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Si la transformation suivante est totale, que vaut l’avancement de la réaction à l’état final ?
x = 0,10 mol
x = 0,20 mol
x = 0,40 mol
x = 0,70 mol
x = 0,30 mol
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Selon le tableau d’avancement de la réaction suivante, que valent a, b et c ?
a = 4 ; b = 7 ; c = 9
a = 12 ; b = 5 ; c = 3
a = 6 ; b = 7 ; c = 9
a = 4 ; b = 5 ; c = 3
a = 4 ; b = 5 ; c = 9
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
On considère la réaction suivante : H3PO4 (aq) + 3 H2O (l) ® PO43-(aq) + 3 H3O+(aq)
Quelle est l’expression correcte de la constante d’équilibre ?
K = [PO43-].[ H3O+]3 / [H3PO4]
K = [PO43-].[ H3O+] / [H3PO4]
K = [H3PO4] / [PO43-].[ H3O+]3
K = [PO43-].[ H3O+]3 / [H3PO4].[H2O]3
K = [H3PO4].[H2O] / [PO43-].[ H3O+]
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Ajuster les nombres stœchiométriques de la réaction suivante :
a C2H4 (g) + b O2 (g) = c CO2 (g) + d H2O (g)
Quels sont les nombres stœchiométriques corrects ?
a=3 b=2 c=2 d=4
a=1 b=3 c=1 d=2
a=1 b=3 c=2 d=2
a=2 b=4 c=4 d=2
a=2 b=3 c=2 d=4
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Le numéro atomique de l’élément sodium est Z=11. Prévoir le type d’ions que donnera le sodium pour satisfaire à la règle de l’octet.
ion Na 2-
ion Na+
ion Na 2+
ion Na -
ion Na 6-
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