Complete the following: Name _____________________________________________ Date____________ Le Chatelier’s Principle Worksheet For each of the following, indicate the direction the equilibrium would shift and what would happen to the concentrations of each substance in equilibrium. 1. The following equilibrium may be established with carbon dioxide and steam. CO(g) + H2O(g) ↔ CO2(g) + H2(g) + heat What would be the effect of each of the following on the equilibrium and concentrations? a.) The addition of more H2O? b.) The removal of some H2? d.) Increasing the pressure? e.) Addition of a catalyst? 2. What would be the effect of each of the following on the equilibrium involving the synthesis of methanol? CO(g) + 2H2(g) ↔ CH3OH(g) a.) The removal of CH3OH? b.) An increase in pressure? c.) Lowering the concentration of H2? d.) The addition of a catalyst? BVH Mr. Gracias Page 1 of 4 HOMEWORK c.) Raising the temperature? 3. A small percentage of nitrogen gas and oxygen gas in the air combine at high temperatures found in automobile engines to produce NO(g), which is an air pollutant. N2(g) + O2(g) + heat ↔ 2NO(g) a.) Higher engine temperatures are used to minimize carbon monoxide production. What effect does higher engine temperatures have on the production of NO(g)? Why? b.) What effect would high pressures have on the production of NO(g)? Why? C(s) + H2O(g) ↔ CO(g) + H2(g) a.) The addition of steam? b.) An increase in pressure? c.) The removal of H2 as it is produced? d.) The addition of a catalyst? HOMEWORK 4. What would be the effect of each of the following on the equilibrium involving the reaction of coke (C(s)) with steam to give CO(g) and H2(g)? 5. The binding of oxygen to hemoglobin (abbreviated Hb), giving oxyhemoglobin (HbO2) is partially regulated by the concentration of H+ and CO2 in the blood. Although the equilibrium is rather complicated it can be summarized as follows: HbO2 + H+ + CO2 ↔ CO2HbH+ + O2 According to Le Chatelier’s principle, what would be the effect of each of the following on the equilibrium: a.) The production of lactic acid (contains H+) and CO2 in a muscle during exercise? b.) Inhaling fresh oxygen enriched air? BVH Mr. Gracias Page 2 of 4 6 Predict what will happen when the reaction volume is decreased in each of the following, after balancing the reactions. a) ___ CO2 (g) + ___ H2O (l) ' ___ C6H12O6 (s) + ___ O2 (g) b) ___ PCl5 (g) ' ___ PCl3 (g) + ___ Cl2(g) c) ___ H2 (g) + ___ CO2 (g) ' ___H2O (g) + ___ CO (g) 7 Balance, the exothermic reaction below. ___ NO2 (g) ' ___ N2O4 (g) ΔH = -58.0 kJ a) add N2O4 b) remove NO2 c) increase the volume d) decrease the temperature e) Add N2 8. The equilibrium constant, KP, for the reaction H2 (g) + I2 (s) ' 2 HI (g) is 0.35 at 25o C. Decide if each of the following mixtures is at equilibrium, at 25o C. If it is not at equilibrium, decide which way the reaction will proceed to reach equilibrium. a) PH2 = 0.10 atm, PHI = 0.90 atm and there is solid I2 present b) PH2 = 0.55 atm, PHI = 0.44 atm, and there is solid I2 present c) PH2 = 0.25 atm, PHI = 0.15 atm and there is solid I2 present BVH Mr. Gracias Page 3 of 4 HOMEWORK Predict the effect of each of the following changes on this system at equilibrium (drive forward reaction, drive reverse reaction, no effect). Le Châtlier’s Principle Explain how the following changes in reaction conditions will affect the position of the equilibrium below, and explain your reasoning. A(g) + B(aq) C(s) 9. ΔHrxn= -453 kJ/mol The pressure of A in the reaction chamber is increased. 11. A catalyst is added to the system. 12. As the reaction progresses, more of compound B is steadily added to the reaction chamber. 13. An inhibitor is added to the reaction chamber. 14. Argon gas is added to the reaction chamber, doubling the pressure. BVH Mr. Gracias Page 4 of 4 HOMEWORK 10. The temperature of the reaction is increased by 200 C.
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