1. N 2 (g) + 3H 2 (g)  2NH 3 (g) K p = 4.51x10 -5 at 450 C All three gases are placed in an evacuated chamber with pressures of N 2 =1.5 atm, H 2 =1.75 atm, and NH 3 =1.5atm. A. Is this reaction at equilibrium? If not, which direction will it proceed? Justify with calculations. B. If the equilibrium pressure of hydrogen is 2.85 atm, what is the equilibrium pressure of ammonia? C. What is the total pressure at equilibrium?

2. For the reaction: A(g) + 2B(g)  2C(g), the Kp at 250 K is known to be 0.0050. a. A, B, and C are placed into a 3.0 liter flask, each at a pressure of 1.25 atm. To which direction will this reaction shift to reaction equilibrium? Justify your answer with calculations. b. What is the equilibrium pressure of C?

3. You are studying a 1.25 M solution of X that has Kb=2.22x 10 -6. (a)Is X an acid or a base? Cite evidence. (Answer in a complete sentence.) (b)Write the equilibrium reaction for X. (c)What is the pH of the solution?

4. Endo or Exo? Co(H 2 O) 6 2+ + 4Cl -  CoCl 4 2- + 6H 2 O Pink Blue Determine if the reaction is endothermic or exothermic by placing the reaction in a hot bath or an ice water bath. 1)Pick whether you want to put the reaction in a hot bath or an ice water bath. 2)Make a logic statements using this prompt: -If I put the reaction in (hot/cold) and the reaction is (endo/exo), I would observe ________. Conversely, if I see _____, I will know the reaction is (endo/exo). (The entire team must have this written down BEFORE you call me over.)

5. The value of equilibrium constant for the reaction below is Kc = 6.0E-6 at 430K. 2 A (g) ↔ B (g) + C (g)ΔH < 0 (molar mass for A= 52.8 g/mol; B= 31.0 g/mol; C= 74.5 g/mol) A.5.0 moles of A are added to a 2.0 L flask at 430 K. Calculate the concentration of B present at equilibrium. B.In a separate experiment, If 3.0 Moles of A and 2.0 moles of B are added to a 2.0 L flask at 430 K, calculate the equilibrium concentration of C. C.Using an initial system at equilibrium, state how the following change when equilibrium is reestablished. Mention if it shifts (left or right) and if things increase, decrease, or stay the same. 1.The equilibrium constant if more B is added. 2.The partial pressure of B if the temperature is increased. 3.The mass of A if B is removed. 4.The pressure of C if C is added.