Chapter 9 - Chemical Equilibrium

Chemical Equilibrium

Quiz

 

1. Which of the following is true for a reaction at equilibrium?
   
   1.   The rate of the forward reaction is greater than the rate of the reverse reaction.
   2.   The rate of the forward reaction is less than the rate of the reverse reaction
   3.   The rate of the forward reaction is equal to the rate of the reverse reaction.
   4.   The concentrations of reactants and products are equal.
2. What does the equilibrium constant (K) indicate about a reaction?
   
   1.   The amount of reactants at equilibrium
   2.   The amount of products at equilibrium
   3.   The ratio of the concentrations of products to reactants at equilibrium
   4.   The speed of the reaction
3. Which of the following expressions correctly represents the equilibrium constant \( K_c \) for the reaction \( N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g) \)?
   1.   \( K_c = \frac{[N_2][H_2]^3}{[NH_3]^2} \)
   2.   \( K_c = \frac{[NH_3]^2}{[N_2][H_2]^3} \)
   3.   \( K_c = \frac{[NH_3]}{[N_2][H_2]^3} \)
   4.   \( K_c = \frac{[N_2][H_2]^3}{[NH_3]} \)
4. Which of the following factors does not affect the equilibrium position of a reaction?
   1.   Concentration of reactants
   2.   Temperature
   3.   Pressure
   4.   Catalyst
5. What will happen to the equilibrium position if the concentration of a reactant is increased?
   1.   It will shift to the right
   2.   It will shift to the left
   3.   It will remain unchanged
   4.   It will reach a new equilibrium at the same position
6. According to Le Chatelier's principle, what is the effect of increasing the temperature on an exothermic reaction at equilibrium?
   1.   The equilibrium will shift to the right
   2.   The equilibrium will shift to the left
   3.   There will be no change
   4.   The rate of the reaction will decrease
7. For the reaction \( 2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g) \), what is the effect of increasing the pressure on the equilibrium position?
   1.   It shifts to the left
   2.   It shifts to the right
   3.   No effect
   4.   The reaction rate increases
8. In a chemical equilibrium, the concentration of products and reactants are
   1.   Always equal
   2.   Always constant
   3.   Continuously changing
   4.   None of the above
9. None of the above
   1.   \( K_p = \frac{P_{CH_3OH}}{P_{CO}P_{H_2}^2} \)
   2.   \( K_p = \frac{P_{CO}P_{H_2}^2}{P_{CH_3OH}} \)
   3.   \( K_p = \frac{P_{CO}}{P_{CH_3OH}P_{H_2}^2} \)
   4.   \( K_p = \frac{P_{CO}}{P_{CH_3OH}P_{H_2}^2} \)
10. If the value of \( K_c \) is very large, what does this indicate about the reaction?
    1.   The reactants are favored
    2.   The products are favored
    3.   The reaction is at equilibrium
    4.   The reaction is very fast