3. Write the equilibrium equations for the following reactions. a. H20 → H* + OH- Kw = 10-14 %3D b. Al3+ + 2 OH¯ + Al(OH)2+ Ka2 = 5x1018 c. CO2(g) + H2O → H2CO3 KH = 10-1.5

1. The shape of boron trihydride, BH3, is 2. In an exothermic reaction, the potential energy of the products is than the potential energy of the reactants. 3. A system at equilibrium always has forward and reverse reaction rates which are 4. A solution at 25°C with a pOH of 3.45 has a pH of 5. When nitric acid is titrated to an end point by lithium hydroxide, two products are and O 6. The standard reduction potential table lists the Evalues of half-cell reactions measured in combination with the standard half-cell.

What is the correct equilibrium constant expression for the balanced reaction shown below? PC13 (9) + PBr3 (9) PCl2Br (g) + PCIBr2(g) [PCl3] [PBr3] [PCl₂ Br][PCIBr₂] [PCIBr₂][PCl₂Br] [PCl3] [PBr3] [PCIBr₂][PCl3][PBr3] [PCl₂Br] [PCIBr₂]²[PCl₂Br]² [PCl3] [PBr3] [PCl3][PBr3] [PCIBr₂]²[PCl₂ Br]² O a. a O b.b OC.C O d.d O e.e a b C d e

20. What will happen to the equilibrium when more SO2 (g) is added to the following system? 2502(g) + O2(g) = 250(g) A. It will shift to the right. B. It will shift to the left C. no shift of equilibrium D. cannot be determined 21. For the reaction 2A+B2C the appropriate form for the equilibrium constant expression is: A. [A][B12/ [C] B. [AB]/[C12 C. [C]2/[A][B] D. [ABRIC] 22. Calculate K for the following reaction given the following equilibrium concentrations of H2, CO, and H₂O. PCl3(g) + Cl₂(g) K=? Equilibrium Concentrations (M): PCIs(g) .200 .040 .080 A. 0.16 B.0.016 C.1.6 D.16 23. Which of the following is not omitted when writing the equilibrium constant expression? D. all of the choices A. gas C. solid B. liquid 24. When can we say that the reaction is already at equilibrium? A. When Q is not equal to K. C. When Q is greater than K. D. When Q is lesser than K. B. When Q is equal to K. 25. Where will the equilibrium shift when we increase the pressure of the system? B. towards…