XI US Before exam - Ciayou
Authored by Juli Novita Sari
Science
9th - 12th Grade
Used 2+ times
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15 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 2 pts
1. In the same concentration, of the following compounds, which has the strongest acidic properties ?
H2S
HCl
H2SO4
HF
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
This symbol indicates that a reaction is _____
reversible
irreversible
3.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
The equilibrium constant expression for the reaction BrF5(g) —> Br2(g) + F2(g) is
Kc = [Br2] [F2] / [BrF5]
Kc = [BrF5]2 / [Br2][F2]5
Kc = [Br2] [F2]5 / [BrF5]2
Kc = 2[BrF5]2 / ([Br2] × 5[F2]5)
Kc = [Br2] [F2]2 / [BrF5]5
4.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Which is the correct equilibrium constant expression for the following reaction?
Fe2O3(s) + 3H2(g) —> 2Fe(s) + 3H2O(g)
K = [H2O]3 / [H2]3
K = [Fe2O3] [H2]3 / [Fe]2[H2O]3
K = [Fe]2[H2O]3 / [Fe2O3] [H2]3
K= [Fe] [H2O] / [Fe2O3] [H2]
K = [H2] / [H2O]
5.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science. CO2(g) + H2O(l) —> H2CO3(aq)
Which one of the following is the correct equilibrium constant expression (Kc) for this reaction?
Kc= 1/ [H2CO3]
Kc= [CO2]/ [H2CO3]
Kc= [H2CO3] / [CO2]
Kc= [CO2] [H2O] / [H2CO3]
Kc= [H2CO3] / [CO2] [H2O]
6.
MULTIPLE CHOICE QUESTION
2 mins • 2 pts
Which of the following changes will shift the position of the equilibrium to the left?
Increasing the temperature of an exothermic reaction.
Increasing the pressure of a reaction that has the same number of moles of gas on both sides
Adding a catalyst to a reaction
Adding more concentrations to the reactants
7.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
At equilibrium, the rate of the forward reaction is ________ the rate of the backward reaction
Greater than
Equal to
Less than
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