# PCHEM - 1 An ideal gas expands isothermally and reversibly...

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1) An ideal gas expands isothermally and reversibly from 1 L to 5 L. Which of the following has happened? A) The system had work done on it. B) The change in internal energy ( Δ U) was positive. C) The maximum work was not gained from the system. D) The system has gained enough heat to equal the work it performed . 2) When one says that the standard free energy of formation of solid iron oxide is -741 kJ, one is referring to the free energy change that accompanies which reaction: A) 4 Fe (s) + 3 O 2(g) 2 Fe 2 O 3(s) B) 2 FeO (s) + O 2(g) Fe 2 O 3(s) C) 2 Fe (s) + 3/2 O 2(g) Fe 2 O 3(s) D) 4 Fe(OH) 3(s) 2 Fe 2 O 3(s) + 6 H 2 O (g) 3) Which statement about standard molar entropy is CORRECT? A) S o of 1 mol Br 2(g) < S o of 1 mol Br 2(l) B) S o of 1 mol O 2(g) in a 5 L container @ 273K > S o of 1 mol O 2(g) in a 1 L contianer @ 273K C) S o of 1 mol KCl (s) > S o of 1 mole KCl (aq) D) S o of 1 mol CH 4(g) > S o of 1 mole CH 3 CH 3(g) 4) The reaction below has a Δ G o of -1324 kJ. Which one of the following statements is NOT valid concerning this reaction at 298 K? X + Y A + B A) The reaction is thermodynamically favorable. B) The reaction is spontaneous as written. C) The reaction will proceed rapidly from left to right. D) The products are more stable than the reactants. 5) When dissolved in an aqueous solution, four of the salts below result in an increase in the pH of the solution. Which salt does NOT cause a rise in pH? A) CaF 2 B) Na 2 CO 3 C) Ag 2 SO 3 D) KClO 4 E) LiOH 6) When NaNO 2 is added to HNO 2(aq) , select the CORRECT statement: A) the equilibrium concentration of HNO does not change B) the pH of the solution does not change C) the equilibrium concentration of HNO 2(aq) increases D) the pH of the solution increases E) K a increases

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CHEM 230 2010-2011 Final Exam Problem Bank Key p2 7) Consider a galvanic cell prepared with 1.0M CuCl 2 , a copper electrode, 1.0 M AgNO 3 , a silver electrode, an external circuit, and a salt bridge. If water is added to the CuCl 2 solution, will the voltage of the cell be affected? If so, how? A) no change in voltage B) voltage will decrease C) voltage will increase 8) An isotope undergoes α decay and forms 231 Th. What is the isotope? A) 235 Pu B) 235 U C) 235 Th D) 237 U E) 231 Pa 9) ( 4 points each row ) Put an “x” in the appropriate box indicating the influence of the following actions on the equilibrium: CO (g) + Cl 2(g) COCl 2(g) Δ H = -204 kJ Shift the Equilibrium Toward Reactants Shift Equilibrium Toward Product No Changes in Equilibrium Add CO (g) X Remove COCl 2(g) X Decrease the volume of the container X Raise temperature of reaction vessel X Add equal amounts of CO and Cl 2 X Add a catalyst X 10) Three solutions are prepared by dissolving 1 mole of a salt in 1kg of water. All of the salts dissolve completely and there is no heat exchanged with the surroundings.
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## This note was uploaded on 02/18/2011 for the course CHEMISTRY 230 taught by Professor Gottfried during the Spring '10 term at University of Michigan.

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PCHEM - 1 An ideal gas expands isothermally and reversibly...

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