
03. TC1P3
Authored by Emmanuel Libberecht
Chemistry
University
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
La loi de Hess fait intervenir :
Des variations d'enthalpie standard de formation
Des énergies de liaison
Des capacités calorifiques
Des variations d'enthalpie standard de changement d'état
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
La loi de Hess permet de calculer la variation d'enthalpie standard de réaction :
de n'importe quelle réaction chimique
uniquement des réactions chimiques en phase gaz
des réactions sans coefficients stœchiométriques seulement
des réactions de changement d'état uniquement
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Pour quelle réaction le ΔrH° peut-il être calculé seulement à l'aide des énergies de liaison ?
C(s) + O2(g) → CO2(g)
Na+(aq) + Cl-(aq) → NaCl(s)
1/2N2(g) + 3/2O2(g) → NH3(g)
H2O(l) → H2O(g)
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Lequel de ces corps a une variation d'enthalpie standard de formation nulle ?
Le dioxyde de carbone
L'eau liquide
Le diazote liquide
Le dihydrogène gazeux
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Quelle est l'expression correcte de ΔrH° pour la réaction suivante :
C(g) + O2(g) → CO2(g)
ΔrH° = ΔrH°f(CO2(g))
ΔrH° = ΔrH°f(CO2(g)) - ΔrH°f(O2(g))
ΔrH° = ΔrH°f(CO2(g)) - 1/2 ΔrH°f(O2(g)) - ΔrH°f(C(s))
ΔrH° = ΔrH°f(CO2(g)) - ΔrH°f(C(g))
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