31) When you open a bottle of a soft drink and leave it open, the drink eventually goes flat. This happens because the equilibrium between carbonic acid and carbon dioxide shifts to produce
A) more carbonic acid.
B) more water.
C) more oxygen.
D) more carbon dioxide.
E) more hydrogen ions.
32) Iron metal reacts with oxygen gas to produce iron(III) oxide. What will be the effect of increasing the pressure of oxygen gas in a closed reaction vessel?
A) Less reaction will take place.
B) More iron oxide will be produced.
C) The reaction mixture will catch fire.
D) There is no effect; a catalyst is needed.
E) The rate of production of iron oxide will slow down.
33) In the following gas phase reaction, what is the effect on the direction of the reaction if more SO3 is added to the reaction mixture?
2SO2(g) + O2(g) ? 2SO3(g)
A) The equilibrium shifts to produce more products.
B) The position of the equilibrium remains unchanged.
C) The rate of formation of products is increased.
D) The equilibrium shifts to produce more reactants.
E) The catalyst for the reaction is used up.
34) In the reaction of nitrogen gas with oxygen gas to produce nitrogen oxide, what is the effect of adding more oxygen gas to the initial reaction mixture? The reaction is shown below.
N2(g) + O2(g) ? 2NO(g)
A) The equilibrium shifts to produce more N2.
B) The equilibrium shifts to produce more NO.
C) The equilibrium is not affected.
D) Extra catalyst is required to reach equilibrium.
E) The temperature of the reaction mixture is raised.
35) The reaction of hemoglobin with oxygen can be written as follows.
Hb + O2 ? HbO2
If the amount of oxygen available to the blood decreases significantly, what happens to the individual involved?
A) Hypoxia results.
B) Anemia results.
C) Nitrogen narcosis results.
D) Oxygen poisoning results.
E) Acclimatization results.
36) The equilibrium for the reaction for the decomposition of PCl5 to chlorine and PCl3 is 0.042.
PCl5(g) ? PCl3(g)+ Cl2(g)
If the equilibrium concentrations are [PCl3] = 0.010 M, [Cl2] = 0.10 M, what is the value of [PCl5]?
A) 0.010 M
B) 0.0020 M
C) 0.042 M
D) 0.024 M
E) 0.0010 M
37) PCl5 (g) ? PCl3 (g)+ Cl2 (g)
For the reaction at equilibrium, if the volume of the container is increased, the amount of PCl5 present will
A) decrease.
B) increase.
C) double.
D) stay the same.
E) triple.
38) Treatment of carbon monoxide poisoning can be accomplished by the use of pure oxygen for breathing. This is an example of the use of __________ in a clinical setting.
A) the ideal gas law
B) Le Chatelier’s principle
C) Henry’s law
D) conservation of mass
E) a precipitation reaction
39) In the reaction of carbon dioxide with water to give carbonic acid, the only gaseous component is the carbon dioxide. What will happen to the equilibrium concentration of carbonic acid if the pressure of carbon dioxide is increased in the container?
A) The concentration of carbonic acid will increase.
B) The carbonic acid concentration will decrease.
C) The carbonic acid concentration will stay the same.
D) There will be twice as much carbonic acid as carbon dioxide.
E) There will be more water available for the reaction.
40) In an exothermic reaction, heat can be considered a __________.
A) reactant
B) product
C) rate
D) catalyst
E) determinant
41) For the reaction of carbon with carbon dioxide to make carbon monoxide, the reaction is as follows.
C(s) + CO2(g) ? 2CO(g)
Adding additional C(s) to the reaction container will cause __________ to occur.
A) the formation of more CO
B) the formation of more CO2
C) a decrease in the amount of CO
D) B and C
E) no change in the amounts of CO and CO2
42) For the following reaction, the equilibrium constant Kc is 2.0 at a certain temperature. The reaction is endothermic. What do you expect to happen to the concentration of NO if the temperature is doubled?
2NOBr(g) ? 2NO(g) + Br2(g)
A) The concentration of NO will increase.
B) The concentration of NO will decrease.
C) There will be no change in [NO].
D) A catalyst will be needed to make a change in concentration.
E) The change in concentration of [NO] will depend on the size of the vessel.
43) For the following reaction, the equilibrium constant Kc is 2.0 at a certain temperature. Bromine can be liquefied easily and removed from the reaction vessel as it is formed. If this is done, how will it affect the equilibrium reaction?
2NOBr(g) ? 2NO(g) + Br2(g)
A) More products will be made as Br2 is removed.
B) There will be a larger proportion NOBr in the vessel when equilibrium is reached.
C) Less NO will be made.
D) The pressure in the vessel will increase.
E) The equilibrium constant will change.
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