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1. A reaction is found to stop just before all reactants are converted to products. Which of the following could be true about this reaction?
2. What is the equilibrium expression for the reaction Cu2SO4 (s) ? 2 Cu+ (aq) + SO42- (aq)?
3. Carbonated beverages are produced by dissolving carbon dioxide in water to produce carbonic acid:
CO2 (g) + H2O (l) ? H2CO3 (aq)
When a bottle containing carbonated water is opened, the taste of the beverage gradually changes as the carbonation is lost. Which of the following statements best explains this phenomenon?
4. What is the proper equilibrium expression for the reaction below?
2 NO2 (g) + 4 H2 (g) ? N2 (g) + 4 H2O (g)
5. If Kc ? 1:
6. Acetic acid dissociates in solution according to the following equation:
CH3COOH ? CH3COO– + H+
If sodium acetate is added to a solution of acetic acid in excess water, which of the following effects would be observed in the solution?
7. Given the reaction below:
FeI (aq) + I2 (g) → FeI3 (aq)
Which of the following would increase the formation of product?
8. If the reaction FeI (aq) + I2 (g) → FeI3 (aq) were exothermic, what effect would decreasing the temperature have on the equilibrium?
9. Which of the following actions does NOT affect the equilibrium position of a reaction?
10. In a sealed 1 L container, 1 mole of nitrogen gas reacts with 3 moles of hydrogen gas to form 0.05 moles of NH3 at equilibrium. Which of the following is closest to the Kc of the reaction?
11. Increasing temperature can alter the Keq of a reaction. Why might increasing temperature indefinitely be unfavorable for changing reaction conditions?
12. Which of the following is true of equilibrium reactions?
I. An increase in k1 results in a decrease in k–1.
II. As the concentration of products increases, the concentrations of reactants decreases.
III. The equilibrium constant is altered by changes in temperature.
13. Compound A has a Ka (equilibrium constant of acid dissociation) of approximately 10–4. Which of the following compounds is most likely to react with a solution of compound A?
14. Consider the following two reactions:
3 A + 2 B ? 3 C + 4 D (Reaction 1)
4 D + 3 C ? 3 A + 2 B (Reaction 2)
If Keq for reaction 1 is equal to 0.1, what is Keq for reaction 2?
15. Which of the following statements best describes the effect of lowering the temperature of the following reaction?
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