UB CHE 102LEC - Test_4_Review (3 pages)

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Test_4_Review



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Test_4_Review

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Pages:
3
School:
University at Buffalo-SUNY
Course:
Che 102lec - General Chemistry Lecture
General Chemistry Lecture Documents

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Chemistry 102 REVIEW QUESTIONS Final Exam 1 Which oxidizing agent shown below will oxidize Br but not Cl a HNO3 b K2Cr2O7 in acid c KMnO4 in acid 2 The equilibrium constant Kc for the reaction shown below is 9 1 X 10 6 at 25oC What is Go for this reaction at this temperature 2Fe3 aq Hg22 aq 2Fe2 aq 2 Hg2 aq 3 Write half reactions and cell notation for a cell that has the following overall reaction Zn s 2HCl aq ZnCl2 aq H2 g 4 Calculate the equilibrium constant K for the following reaction at 25oC from standard electrode potentials 2 Fe s 6 H aq 2 Fe3 aq 3 H2 g Chemistry 102 5 The free energy change G for the reaction A g B g is zero under certain conditions The standard free energy change G for this reaction is 42 5 kJ Which of the statements below must be true about this reaction a The concentration of the product is greater than the concentration of the reactant b The reaction is at equilibrium c The concentration of the reactant is greater than the concentration of the product 6 Calculate the cell potential of a cell of a cell operating with the following reaction at 25oC in which VO2 0 010M H 1 0M Ni2 2 0 M and VO2 2 0 M Ni s 2 VO2 aq 4 H aq Ni2 aq 2 VO2 aq 2 H2O l 7 Which process is spontaneous at 298 K Hint Use data in appendix II in your text to calculate G and then calculate G for non standard non standard conditions a H2O l H2O g 1 atm b H2O l H2O g 0 10 atm c H2O l H2O g 0 010 atm Chemistry 102 ANSWERS 1 K2Cr2O7 in acid 2 29 kJ 3 Zn s Zn2 aq H aq H2 g Pt 4 K 4 5x103 5 a 6 1 08 V 7 c



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