Welcome to the Quiz!
This quiz contains 12 questions from a mix of 1 subtopics.
According to Le Châtelier's principle, if a reaction is endothermic and the temperature is decreased, what will happen to the equilibrium position?
it will move to the right
it will stay the same
it will move to the left
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What effect does increasing the temperature have on the equilibrium constant for an exothermic reaction?
it increases
it stays the same
it decreases
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If Kc for a reaction is much greater than 1, what can be said about the position of equilibrium?
reactants predominate over products
the equilibrium position is in the middle
the equilibrium position cannot be determined
products predominate over reactants
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What is the effect of a catalyst on the equilibrium constant and the position of equilibrium?
it increases the equilibrium constant and moves the equilibrium to the right
it decreases the equilibrium constant and moves the equilibrium to the left
it has no effect on the equilibrium constant or the position of equilibrium
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In an endothermic reaction, Kc when the temperature is increased.
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In an exothermic reaction, Kc when temperature is decreased.
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How does Kc change when the concentration of products in a reaction at equilibirum are increased?
Kc increases
Kc stays the same
Kc decreases
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The following reaction takes place at equilibrium:
A + B ⇌ C ΔrH = -10 kJ mol-1
Select ALL of the changes to conditions that could be made without altering the value of Kc.
add a catalyst
increase the temperature
increase the concentration of A
decrease the temperature
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What is the most likely value of Kc for a reaction that does not take place at all?
10-10
1
1010
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The following reaction takes place at equilibrium:
2A(g) + 3B(g) ⇌ 3C(g) + D(g) ΔHr = +50 kJ mol-1
Select ALL of the changes to conditions which would shift the position of equilibrium to the right.
decrease the temperature
increase the temperature
decrease the pressure
increase the pressure
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The following reaction takes place at equilibrium:
4A(g) + B(g) ⇌ 2C(g) + 3D(g) ΔrH = +70 kJ mol-1
Select the change to conditions which would shift the position of equilibrium to the left.
decrease the pressure
increase the pressure
increase the temperature
decrease the temperature
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Select ALL of the conditions that could be changed in a reaction at equilibrium without altering the value of Kc.
catalyst
concentration
pressure
temperature
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