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ISU CHEM 178 - Practice exam

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Chapter 15:Le Chateliers Principle Supplemental InstructionIowa State UniversityLeader: KelseyCourse: Chemistry 178Instructor: VerkadeDate: 09/16/20101. For the reaction:CH3OH(g) + O2(g) HCOOH(g) + H2O(g)a. What direction does the equilibrium shift if more oxygen is added?b. What direction does the equilibrium shift is water is removed?c. How does the concentration of methanol (CH3OH) change if more oxygen is added?d. How does the concentration of methanol change if more water is added?e. How does the concentration of methanol change when more methanol is added?2. How does an increase in pressure affect the concentration of the first reactant in the following reactions?a. C2H4(g) + H2(g) C2H6(g)b. Xe(g) + 3 F2(g) XeF6(g)c. C(s) + 2 F2(g) CF4(g)d. H2S(g) + Hg(l) HgS(s) + H2(g)3. How does the concentration of the first reactant change if the temperature decreases?a. C2H4 + H2 C2H6 (exothermic)b. 2 NOCl 2 NO + Cl2 (endothermic)Supplemental Instruction1060 Hixson-Lied Student Success Center v 294-6624 v www.si.iastate.edu4. A flask is charged with 3.000 atm of N204(g) and 2.00 atm NO2(g) at 25 degrees Celsius, and the following equilibrium is achieved: N2O4(g )2 NO2(g )←→. After equilibrium is reached, the partial pressure of NO2 is 0.512 atm. What is the equilibrium partial pressure of N2O4?5. Write the balanced chemical equations for the endothermic reaction of OH2¿¿2+¿CO¿ in the presence of chloride ion in equilibrium with 2−¿CO Cl4¿ plus


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