
NDS10 Chimie
Authored by Château Château Eğitim
Chemistry
1st - 5th Grade
Used 3+ times

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7 questions
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1.
OPEN ENDED QUESTION
3 mins • Ungraded
Quelle masse de carbonate de calcium CaCO3 contiendra la même masse d’oxygène que 4,4g
de dioxyde carbone ?
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2.
OPEN ENDED QUESTION
3 mins • Ungraded
Dans le composé XY4 il y a 20% de l’élément X. Quel est le pourcentage l’élément X dans le
composé X2Y3 ?
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3.
OPEN ENDED QUESTION
3 mins • Ungraded
Un composé organique de masse molaire 90 g.mol-1 contient 40% de carbone, 6,66%
d’hydrogène et 53,33% d’oxygène. Quelle sera sa formule brute ? (C:12, H:1, O:16)
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4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
7g de l’élément A forment avec 16 g de B le composé AB4. 10,5g de A avec 18g de B forment
un deuxième composé. Quelle est sa formule ?
AB2
AB3
A2B3
AB4
5.
OPEN ENDED QUESTION
3 mins • Ungraded
Un composé contient 84% C et 16% H.Trouvez la formule.( C= 12,H=1)
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6.
OPEN ENDED QUESTION
3 mins • Ungraded
Dans l’oxyde de cuivre le rapport des masses est
mCu/mO=4. Quand on fait réagir les
mêmes masses de cuivre et d’oxygène, on obtient 25g d’oxyde de cuivre CuO. Quelle masse
de quel élément est en excès ?
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7.
OPEN ENDED QUESTION
3 mins • Ungraded
Dans les mêmes conditions de température et de pression, 1L du gaz CxH8 forment avec yL de
gaz hydrogène un volume de 1L du gaz C5H12. Quelles sont les valeurs de « x » et « y » ?
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