Which of the following statements is TRUE? A) If Q K, it means the forward react

Question

Which of the following statements is TRUE? A) If Q K, it means the forward reaction will proceed to form more products. C) If Q = K, it means the reaction is not at equilibrium. D) All of the above are true. E) None of the above is true. Consider the following reaction at equilibrium. Which will happen if the volume increased? 4 FeS_2 (s) + 11 O_2 (g) 2 Fe_2 O_3 (s) + 8 SO_2 (g) A) The equilibrium constant will increase. B) The equilibrium will change in the direction of the reactants. C) The equilibrium will change in the direction of the products. D) No change in equilibrium is observed. E) The equilibrium constant will decrease. Consider the following reaction at equilibrium. What effect will increasing the temperature have on the system? Fe_3O_4 (s) + Co (g) 3 FeO (s) + CO_2 (g) Delta H degree = + 35.9 kJ A) The reaction will shift to the left in the direction of reactants. B) The equilibrium constant will increase. C) The equilibrium constant will decrease. D) No effect will be observed. E) The reaction will shift to the right in the direction of products. Which of the following is NOT a conjugate acid-base pair? A) NH^+_4/NH_3 B) H_3O^+/OH^- C) H_2SO_3/HSO^-_3 D) C_2H_3O^-_2/HC_2H_3O_2 E) All of the above are conjugate acid-base pairs. Which of the following solutions would have the highest pH? Assume that they are all 0.10 M in acid at 25 degree C. The acid is followed by its K_a value. A) HF, 3.5 times 10^-4 B) HCN, 4.9 times 10^--10 C) HNO_2 4.6 times 10^-4 D) HCHO_2, 1.8 times 10^-4 E) HClO_2, 1.1 times 10^-2 How many of the following are weak acids? HNO_2 HF HNO_3 H_3PI_4 A) 0 B) 1 C) 3 D) 4 E) 2

Explanation / Answer

4. A) Q < K, forward reaction will proceed to form more products

5. C) the equilibrium will change in the direction of products (Towards lesser number of gas molecules)

6. E) the reaction will shift to the right in the direction of the products

7. B) H3O+ /OH- (H3O+/H2O and H2O/OH- are conjugate acid base pairs)

8. B) HCN

9. E) 2 (HNO2 and HF are weak acids)

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