Q. For the equilibrium reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what happens if SO3 is removed?
A.
Equilibrium shifts to the right
B.
Equilibrium shifts to the left
C.
No change in equilibrium
D.
Reaction stops
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Solution
Removing SO3 decreases its concentration, causing the equilibrium to shift to the right to produce more SO3 and restore balance.
Correct Answer:
A
— Equilibrium shifts to the right
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Q. For the equilibrium reaction A(g) + B(g) ⇌ C(g), if the temperature is decreased and the reaction is endothermic, what will happen?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Reaction stops
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Solution
Decreasing the temperature of an endothermic reaction shifts the equilibrium to the right, favoring the formation of products.
Correct Answer:
A
— Shift to the right
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Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what will happen if H2 is removed?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Reaction stops
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Solution
Removing H2 will shift the equilibrium to the left to produce more reactants, according to Le Chatelier's Principle.
Correct Answer:
B
— Shift to the left
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Q. If a reaction is at equilibrium and the volume of the container is decreased, what will happen?
A.
Shift to the side with more moles of gas
B.
Shift to the side with fewer moles of gas
C.
No effect
D.
Reaction stops
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Solution
Decreasing the volume increases the pressure, which shifts the equilibrium towards the side with fewer moles of gas.
Correct Answer:
B
— Shift to the side with fewer moles of gas
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Q. If the temperature of an exothermic reaction is increased, what will happen to the equilibrium?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Reaction rate increases
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Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants, as the system tries to absorb the added heat.
Correct Answer:
B
— Shift to the left
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Q. In a reaction at equilibrium, what happens if the pressure is increased?
A.
Shifts to the side with more moles of gas
B.
Shifts to the side with fewer moles of gas
C.
No effect
D.
Reaction stops
Show solution
Solution
Increasing the pressure will shift the equilibrium position towards the side with fewer moles of gas, according to Le Chatelier's Principle.
Correct Answer:
B
— Shifts to the side with fewer moles of gas
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Q. In the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what will happen if SO3 is added?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Reaction stops
Show solution
Solution
Adding SO3 will shift the equilibrium to the left to favor the formation of reactants, according to Le Chatelier's Principle.
Correct Answer:
B
— Shift to the left
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Q. What is the effect of adding a strong acid to a reaction at equilibrium involving a weak base?
A.
Shifts equilibrium to the right
B.
Shifts equilibrium to the left
C.
No effect on equilibrium
D.
Increases reaction rate
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Solution
Adding a strong acid increases the concentration of H+ ions, which can react with the weak base, shifting the equilibrium to the left to favor the formation of reactants.
Correct Answer:
B
— Shifts equilibrium to the left
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