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: 3) Which statement about standard molar entropy is CORRECT? 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 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:
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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? 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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