anotherpracticeexamkey - 1. Multiple Choice (4 pts. each):...

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Unformatted text preview: 1. Multiple Choice (4 pts. each): a. For an electrochemical cell to be galvanic, what must be true: A. Eceu<0 AG<0 C. K=1 D. n=2 b. The potential of interaction between an electron and which of the following species will be greatest in magnitude for the following: A. H B. He+ (3)14+2 D. He c. The electron configuration 1322s22p63s23p64sz3d5 corresponds to: A: Tc C: Fe D: Cr d. Which element has the electronic structure [Ar]4sz3d6: A: V B: Cr © Fe D: Ru e. The workfunction of Nb is 6.67 X 10'19 J. This corresponds to which of the following wavelengths: A. 459 nm B. 287 nm @298 nm D. 320 nm Page 2 Multiple choice (cont) f. No currently known element contains electrons in “g orbitals,” but we may find such elements one day. How many electrons can be incorporated into a set of g orbitals: A: 10 14 C: 18 D: 20 g. Which of the following is not an allowed set of quantum numbers for the H atom (given in the form {n, 1, m1}): A: {3,1,1} B: {2, o, 0} @{0, o, 0} D: {1, 0, 0} h. What is the ionization energy for the H atom? A: 5.3x106J/mol @13x1061/m01 C: 2.6X106 J/mol D: 2.1x106J/m01 j. If n = 3 and 1 = 2, how many ml levels are there: A: 1 B: 3 © 5 D: 10 k. Sodium losing an electron is a process, and fluorine losing an electron is a process. A: endothermic, exothermic ® endothermic, endothermic C: exothermic, endothermic D: exothermic, exothermic Page 3 Section II: Long—Answer/Numerical Questions 2 (20 pts.) Lewis Dot Structures. Write the Lewis dot structures for the following compounds. Include all structural isomers, resonance structures, and formal charges for each structure. Underline the one you believe is the most—reasonable structure. Finally, using VESPR describe the 3D geometry of your most— reasonable structure. An example is provided below: Ex: 03 H H “ 5 o . , x \ haiku ’o/ I? lo” 9/.\ W "1 geometry . a) BrO2 ‘i' , “I” ‘B__E>r———E)I lBF‘O-‘gl “l. :l m‘ 0 0 "'l ‘_____________ geometry b) SF4 .. \F‘ _ i F_‘ IS _ i \E‘ \F\ " geometry fl SAW . C) ONF ‘ - H M .. -\ //0\ // \ ° 0 ’Qo 5‘6 ‘E f E‘ - e 6 N " ’ \\(—-\ ’0’ V9 “f H / «I \ , ._- “2- - | | + geometry . Page 4 3 (10 pts.) What wavelength of light corresponds to electron relaxation from n = 4 ton=1in1£2? K—e 2:3 if = Fm 46mm - 1% i _ J. ‘ * l\7%xtb J1? W1 2) fimg‘ W:ll\b\hk ,9) 'Q113xw1J(q)(1- J.) 4 a, ‘5 {.84xL61J Page 5 4. A proposed fuel cell involves the following reaction: Gag) + gong) a Gong) Given the standard thermodynamic data below, determine the half—cell potential for the oxidation of CO(g) in aqueous media. ‘ Fifi/$7 J CLAluJA'b» Abow 0 MM =’ Aw" (can _ All; (col = 4% kl A32“, = smog —6(Cel — 35W) ’ «0.0%» J Page 6 More room for problem 4 P o r -Albm 257,000J *3? mama/wag ) 2 Law uu—Qsz,‘ H U _. ‘0 o H”? taut t'§’(C°qC°£) *EVZQJ?%A 11735) {M Madam) u 0 M o.tb\/ = Ev} (Cay—x031) \g Page 7 5a. Consider the following electrochemical cell: Cr(s)|Cr +3(aq)||1vo;(aq)|N0(g) (with 21 Pt electrode) Write a balanced reaction for the above reaction occurring in acidic solution and determine the cell potential. CF’ “A C4“- 3+ 33,. Elia 2 0"‘(4v 7 36_+4‘H+ + no; _+ no + gauge 9,; a 0.ch dr + Mos" “WW die“ + Mo +290 Page 7 5b. A precipitating reagent is added to the anode side of the electrochemical cell and the cell potential increases to 1.9 V. Determine the concentration of the original ionic anode species after the addition of the precipitating reagent. ‘ 117' Amie.) mug, 3W8 [6 Cr}— 5 3 Wm} euqu‘VX‘W/‘fi Larva} lLQcLUuQfiL Qr+3 awe“, e 0.05th ECO/H : Em; ‘ T [07 ()3 LS Q 1.7V —- 0.039”! p “’5‘ [‘79 mu.) Q : [—015] Page 9 Standard Electrode (Half-Cell) Potentials (298 K) Skeletal Half Reaction (as Reduction)* E° 1V2 C0+3 (aq)/Co+2 (aq) +1.82 Au+3(aq)/Au(s) +1.50 02(g)/H20(1) +1.23 Br2 (1)/ ZBr' (aq) +1.07 NO3' (aq)/NO (g) +0.96 NO3' (aq)/N204 (g) +0.83 Ag+ (ag)/Ag (8) +0.80 02(g)/OH'(aq) +0.40 Cu+2 (aq)/Cu (3) +0.34 2H+ (aq)/H2 (g) 0.00 Sn+2 (aq)/Sn (s) -0. 14 Cd+2 (aq)/Cd (s) -040 Fe+2 (aq)/Fe (s) —0.44 Cr+3 (aq)/Cr (s) -0.74 Zn” (aq)/Zn (s) —0.76 Mg+2 (aq)/Mg (s) —1. 18 Na+ (aq)/Na (s) —2.71 7 *All reactions are written as reductions. Water/H+/OH'/e‘ needed to create a balanced half-cell reaction are suppressed. mew 0A MN. “I My A14 mu "2 cc“? -- Page 10 ...
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This note was uploaded on 01/25/2012 for the course CHEM CHEM 152 taught by Professor Daruwala during the Spring '09 term at University of Washington.

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anotherpracticeexamkey - 1. Multiple Choice (4 pts. each):...

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