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Study Quiz 3
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1
Which of the following is true if the reaction quotient is greater than Kc?
A)The system is at equilibrium.
B)Equilibrium will be achieved by moving to the right.
C)Products are favoured.
D)The system must move to the left to achieve equilibrium.
2
Which of the following is true if Kc = 0.30 and Qc = 12.5?
A)The concentrations of substances on the left side of the reaction equation must be greater than the concentrations at equilibrium.
B)The concentrations of substances on the right side of the reaction equation must be greater than the concentrations at equilibrium.
C)The system must move to the right to reach equilibrium.
D)The system favours products.
3
What effect will increasing the temperature have on an endothermic reaction?
A)It will decrease the value of Kc and the equilibrium will shift toward the reactants.
B)It will increase the value of Kc and the equilibrium will shift toward the products.
C)It will decrease the value of Kc and the equilibrium will shift toward the products.
D)It will increase the value of Kc and the equilibrium will shift toward the reactants.
4
What effect will adding an ionic solid have on an equilibrium solution if one of the ions in the solid is already present as a reactant?
A)There will be no effect on Kc and the equilibrium will shift toward the reactants.
B)There will be an increase in the value of Kc and the equilibrium will shift toward the products.
C)There will be no effect on Kc and the equilibrium will shift toward the products.
D)There will be a decrease in the value of Kc and the equilibrium will shift toward the products.
5
What effect will increasing the volume of a container at constant temperature have on an equilibrium system?
A)A reaction with more gaseous product molecules than reactant gaseous molecules will shift toward the products.
B)A reaction with fewer gaseous product molecules than reactant gaseous molecules will shift toward the products.
C)The value of Kc for a reaction with fewer gaseous product molecules than reactant gaseous molecules will increase.
D)The value of Kc for a reaction with more gaseous product molecules than reactant gaseous molecules will increase.
6
The reaction below absorbs thermal energy in the forward direction. Which of the following changes will cause the equilibrium to shift to the right?

C(s) + CO2(g) ⇔ 2CO(g)

A)Increasing the temperature
B)Removing C(s)
C)Increasing pressure by decreasing the volume of the reaction container
D)Removing CO(g)
7
In the reaction below, which of the following changes will not cause a shift in the equilibrium?

C(s) + CO2(g) ⇔ 2CO(g) ∆H° = 172 kJ

A)Using a catalyst
B)Adding CO2(g)
C)Removing CO(g)
D)Decreasing the temperature
8
Which of the following equilibrium systems will shift to the right as a result of increasing the volume of the reaction container?
A)2SO2(g) + O2(g) ⇔ 2SO3(g)
B)4NH3(g) + 5O2(g) ⇔ 4NO(g) + 6H2O(g)
C)H2(g) + CO2(g) ⇔ H2O(g) + CO(g)
D)H2(g) + I2(g) ⇔ 2HI(g)
9
The synthesis reaction of ammonia shown below is exothermic. What is the function of the catalyst used?

N2(g) + 3H2(g) ⇔ 2NH2(g)

A)To increase the yield
B)To decrease the temperature of the reaction
C)To allow the reaction to occur at a faster rate
D)To allow the reaction to occur at a slower rate





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