april 25th morning - Calc E then K 9(1 point(s What is the...

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Unformatted text preview: . Calc E then K 9 (1 point(s)) What is the value of the equilibrium constant at 25 oC for the reaction between the pair: Br2(l) and I(aq) ­ Use the reduction potential values for Br 2(l) of +1.07 V and for I(s) of +0.53 V 2 Give your answer using E­notation with NO decimal places (e.g., 2 x 10­2 would be 2E­2; and 2.12 x 10­2 would also be 2E­2.). Do NOT include spaces, units, punctuation or anything else silly! 2. Calc E then G 15 (1 point(s)) What is the value of DG o in kJ at 25 C for the reaction between the pair: o Cu(s) and Cr3+ (aq) to give Cr(s) and Cu + 2 (aq) Use the reduction potentials for Cr(aq) is ­0.74 V and for Cu (aq) is +0.34 V. 3+ 2+ Title: Apr 25­8:52 AM (1 of 7) 3. Nernst 2 (1 point(s)) A voltaic cell consists of an Ni/Ni 2+ half­cell and a Co/Co + 2 half­cell. Calculate E when [Ni + cell 2 ] = 0.688 M and [Co2+ = 0.00605 M. You should use the reduction potentials for Ni 2+ is ­0.247 V and for Co is ­0.277 V. 2+ Title: Apr 25­8:55 AM (2 of 7) 4. Nernst Concentrations 3 (1 point(s)) A voltaic cell consists of an Ni/Ni 2+ half­cell and a Co/Co + 2 half­cell. Calculate [Co ] when [Ni + 2+ 2 ] = 0.882 M and Ecell = 0.03830 M. Use reduction potential values of Ni 2+ = ­0.25 V and for Co2+ = ­0.28 V. Use scientific (E) notation with 2 numbers after the decimal point. Title: Apr 25­8:55 AM (3 of 7) 5. Electrolysis Molten 13 (1 point(s)) In the electrolysis of molten NaCl, which product forms at the anode? 1. H2(g) 2. Na(l) 3. Cl2(g) 4. O2(g) 8. Electrolysis Aqueous 19 (1 point(s)) What product(s) forms at the anode in the electrolysis of an aqueous solution of Cu(HCO 3)2? 1. H2 and OH­ 2. carbon 3. O2 and H+ 4. Cu Title: Apr 25­8:55 AM (4 of 7) 10. Electrolysis Aqueous 16 (1 point(s)) What product(s) forms at the cathode in the electrolysis of an aqueous solution of ZnBr 2? 1. H2 and OH­ 2. O2 and H+ 3. Zn 4. Bromine Title: Apr 25­8:56 AM (5 of 7) 11. Electrolysis g to time 1 (1 point(s)) Electrolysis of molten MgCl 2 is the final production step in the isolation of magnesium from seawater by the Dow process. If 64.1 g of Mg are obtained, how long (in hours) must a current of 2.82 amps be passed? 12. Electrolysis C to g 37 (1 point(s)) How many grams of vanadium may be formed by the passage of 79,277 C through an electrolytic cell that contains an aqueous V(V) salt. Title: Apr 25­8:56 AM (6 of 7) Title: Apr 25­9:00 AM (7 of 7) ...
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This note was uploaded on 08/16/2011 for the course BIOL 1361-1362 taught by Professor Any during the Spring '08 term at University of Houston.

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