AnswersMO-Physical Science A-CRShifts in Equilibrium

Shifts in Equilibrium Answers

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Consider the following chemical equation in equilibrium. H2SO4(aq) 2H+ + SO42– What will happen to the chemical equilibrium if HCl is added to the system?

Question illustration
A
The chemical equilibrium will shift to the right.
B
The chemical equilibrium will be lost permanently.
C
The chemical equilibrium will not be affected.
D
The chemical equilibrium will shift to the left.
2
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Consider the reaction H2(g) + I2(g) HI(g) with an equilibrium constant of 46.3 and a reaction quotient of 525. Which direction will the system shift to?

Question illustration
A
The equilibrium will shift to the left to favor the reactants.
B
The equilibrium will shift to the right to favor the products.
C
The equilibrium will not shift in any direction.
D
The equilibrium will shift to the forward reaction.
3

According to Le Chatelier’s principle, what happens to the equilibrium constant (K) when the concentration of the reactants is doubled?

A
The value of the equilibrium constant (K) is doubled.
B
The value of the equilibrium constant (K) is halved.
C
The value of the equilibrium constant (K) remains the same.
D
The value of the equilibrium constant (K) changes unpredictably.
4

Consider the reaction in chemical equilibrium. COCl2(g) CO(g) + Cl2(g) Which is the correct equation for K?

Question illustration
A
Upper K = StartFraction left-bracket Upper C Upper O Upper C l Subscript 2 Baseline right-bracket Superscript 2 Over left-bracket Upper C Upper O right-bracket left-bracket Upper C l Subscript 2 Baseline right-bracket EndFraction
Option A
B
Upper K = StartFraction left-bracket Upper C Upper O Upper C l Subscript 2 Baseline right-bracket Over left-bracket Upper C Upper O right-bracket left-bracket Upper C l Subscript 2 Baseline right-bracket EndFraction
Option B
C
Upper K = StartFraction left-bracket Upper C Upper O right-bracket left-bracket Upper C l Subscript 2 Baseline right-bracket Over left-bracket Upper C Upper O Upper C l Subscript 2 Baseline right-bracket EndFraction
Option C
D
Upper K = StartFraction left-bracket Upper C Upper O right-bracket left-bracket Upper C l Subscript 2 Baseline right-bracket Over left-bracket Upper C Upper O Upper C l Subscript 2 Baseline right-bracket Superscript 2 EndFraction
Option D
5

Consider the chemical equilibrium of the reaction. AgCl(s) Ag+(aq) + Cl–(aq) What will happen to the chemical equilibrium if AgNO3 is added?

Question illustration
A
There is no shift in the chemical equilibrium of the system.
B
The chemical equilibrium of the system shifts to the right.
C
The chemical equilibrium of the system shifts to the left.
D
The chemical equilibrium of the system is destroyed.
6

Consider the following chemical reaction in equilibrium. CH3COOH CH3COO–(aq) + H+(aq) What will happen to the chemical equilibrium if MgCl2 is added?

Question illustration
A
The chemical equilibrium of the system will be unaffected.
B
The chemical equilibrium of the system will shift to the right to favor the forward reaction.
C
The chemical equilibrium of the system will shift to the left to favor the reverse reaction.
D
The chemical equilibrium of the system will be damaged irreversibly.
7

Consider the chemical equation in equilibrium. 2H2(g) + O2(g) 2H2O(g) What will happen if the pressure of the system is increased?

Question illustration
A
The reaction will not change.
B
The reverse reaction will be favored.
C
The reaction will stop completely.
D
The forward reaction will be favored.
8

Consider the chemical equation in equilibrium. CH4(g) + H2O(g) CO(g) + 3H2(g) What will happen to the equilibrium of this reaction if the pressure is increased?

Question illustration
A
The equilibrium will shift to the left to favor the reverse reaction.
B
The equilibrium will shift to the right to favor the forward reaction.
C
The equilibrium will not be affected by changing the pressure.
D
The equilibrium will not be reestablished after this kind of stress.
9

According to Le Chatelier’s principle, which statement is true?

A
The equilibrium constant is unchanged by temperature changes.
B
The equilibrium constant changes with a change in temperature.
C
The equilibrium constant increases with the concentration of reactants.
D
The equilibrium constant decreases with the concentration of products.
10

According to Le Chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that

A
reduces the stress.
B
normalizes the stress.
C
increases the stress.
D
changes the stress.

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