AnswersIA-Chemistry A Survey of Chemistry AShifts in Equilibrium

Shifts in Equilibrium Answers

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

r
reduces the stress.
n
normalizes the stress.
i
increases the stress.
c
changes the stress.
2
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According to Le Chatelier’s principle, what always happens to the equilibrium of a reaction when the temperature is reduced?

I
It shifts to the right.
I
It shifts to the left.
I
It shifts in the exothermic direction.
I
It shifts in the endothermic direction.
3

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

T
The value of the equilibrium constant (K) is doubled.
T
The value of the equilibrium constant (K) is halved.
T
The value of the equilibrium constant (K) remains the same.
T
The value of the equilibrium constant (K) changes unpredictably.
4

Change

Question illustration
v
value of K does not change
v
value of K increases
v
value of K decreases
v
value of K oscillates
5

What is the definition of a common ion as it applies to Le Chatelier’s principle?

a
an ion that is found in a wide variety of compounds
a
an ion that is present in every sample of pure water
a
an ion that is found dissolved in most aqueous solutions that are widely used in labs
a
an ion that is present in an equilibrium system and a compound added to the system
6

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
T
The equilibrium will shift to the left to favor the reactants.
T
The equilibrium will shift to the right to favor the products.
T
The equilibrium will not shift in any direction.
T
The equilibrium will shift to the forward reaction.
7

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
T
The chemical equilibrium of the system will be unaffected.
T
The chemical equilibrium of the system will shift to the right to favor the forward reaction.
T
The chemical equilibrium of the system will shift to the left to favor the reverse reaction.
T
The chemical equilibrium of the system will be damaged irreversibly.
8

Consider the following chemical reaction at equilibrium. H2SO4(aq) 2H+(aq) + SO42–(aq) The addition of which compound will cause a shift in equilibrium because of a common ion effect?

Question illustration
N
NaCl
K
KNO3
M
MgSO4
F
FeCl3
9

true

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

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
T
The chemical equilibrium will shift to the right.
T
The chemical equilibrium will be lost permanently.
T
The chemical equilibrium will not be affected.
T
The chemical equilibrium will shift to the left.

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