
SP - Juin - Séance 10
Chemistry
University
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15 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Une base est d’autant plus forte :
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Quelle est l’écriture la plus correcte ?
HCl → H+ + Cl-
HCl + H2O → H+ + Cl-
HCl → H+ + Cl-
HCl + H2O → H+ + Cl-
HCl + H2O → H3O+ + Cl-
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Quelle est l’écriture la plus correcte pour illustrer l’ionisation de l’acide phosphorique dans l’eau ?
H3PO4 + H2O→ H2PO4- + H3O+
H3PO4 + H2O → H2PO4- + H3O+
H3PO4 → PO43- + 3 H+
H3PO4 + H2O → PO43- + 3 H+
H3PO4 → PO43- + 3 H+
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Quelle est l’écriture la plus correcte pour illustrer l’ionisation de l’ammoniac dans l’eau ?
NH4OH → NH4+ + OH-
NH4OH → NH4+ + OH-
NH3 → NH4+ + OH-
NH3 + H2O → NH4+ + OH-
NH3 + H2O → NH4+ + OH-
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Quel est le couple acide/base conjugués qui n’est pas correct ?
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Le couple HCN/CN- a un Ka = 10-9,3 et le couple HAc / Ac- : Ka = 10-4,76. Choisis la proposition correcte :
force de HCN > force de HAc et force de CN- > force de Ac-
force de HCN > force de HAc et force de CN- < force de Ac-
force de HCN < force de HAc et force de CN- > force de Ac-
force de HCN < force de HAc et force de CN- < force de Ac-
force de HCN = force de HAc et force de CN- = force de Ac-
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Classer les acides suivants par ordre d’acidité croissante :
A. HNO2 pKb = 10,6
B. H3PO3 pKb = 12,2
C. H3BO3 pKa = 9,2
D. H3PO4 pKa = 2,1
E. HCOOH pKb = 10,2
B < C < D < E < A
B < A < E < C < D
D < C < E < A < B
C < E < A < D < B
B < D < A < E < C
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