Ch115_T3B_F06_Key - Page i of6 B Name Q Please Print...

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Unformatted text preview: Page i of6 B Name Q Please Print) Student Number Chem 115 - Section 1 Hour Examination III December 11, 2006 This test consists of six (6) pages, including this cover page. Be sure your copy is complete before beginning your work. Ifthis test packet is defective, ask for another one. A separate copy of the periodic table will be distributed with this test packet. Feel flee to use it in conjunction with any test question. DO NOT WRITE BELOW THIS LINE TOTAL Robert L. Carter, Ph.D © 2010 ocw.umb.edu B l. a. Page 2 of 6 bknne______lS:Eii¥L_‘_____;______________ (36 points; 3 points each) Circle the correct answer to each of the following. The following sets of three digits represent values of n, I, and m,, respectively. Which set is not permissible? 2,1,4 2, 0, 0 4, 3, 2 5,2, 0 . Which one of the following is not a ground state configuration of an atom? [Ne]3.s'23p2 1322522}; 132252 152232;)“ . Who proposed that in the ground state of an atom electrons in the same subsheil will tend to occupy separate degenerate orbitals with their spins parallel, to the extent possible? Pauli Schrodinger deBroglie Heisenberg . Which one of the following orbitals has one node? 45 Is 3s 3d,], . Which one 'of the following has the largest lattice energy? (351 K20 A1203 BaS Which one of the following configurations would result in a paramagnetic atom or ion? 1522322p‘ [Ne]3s2 [Ar]3d'°4s’ [M432 Which one of the following atoms or ions is smallest? Kr @ Co 002+ Br' . Which one of the following would have the largest first ionization energy? I As Te In Robert L. Carter, Ph.D © 2010 ocw.umb.edu Page 3 of6 9 Name_{e¥__ i. Considering the Lewis-dot representations of the following species, in which one would the central atom be considered to be electron deficient? (:02 13H; 3(er P125 j. Which one of the following represents a 3d”, orbital? it; is is .n k. Judging from trends in electronegativity, Which one of the following bonds would be most polar? F—F O—N Cl—Br Cl—N l. The two Kekulé resonance forms of benzene are shown below. On the basis of these forms, which one of the following best describes the real state of the carbon-carbon bonds in benzene? All carbon-carbon bonds are the same — about the same length as a C—C single bond. All carbon-carbon bonds are the same — about the same length as a C=C double bond. All carbon-carbon bonds are the same — longer than a C—C single bond and shorter than a C=C double bond. All carbon-carbon bonds are the same -— shorter than a C—C single bond and longer than a C=C double bond. Benzene has two bond lengths — a longer single bond and a shorter double bond. Robert L. Carter, Ph.D © 2010 ocw.umb.edu Page 4 of6 a Name l4 8.? 2. (15 points; 3 points each) Fill in the blanks with the correct answers. Do not use noble gas core notation; e.g., [Ne], and do not include closed subshells that are not part of the valence configuration. a. The symbol for the element whose valence electronic configuration is 4.924};3 is EL. b. The valence configuration of24Cr is 55543 . (0Q ate; 3&9) c. In the space below draw the orbital diagram ("line-and—anow" notation; e.g., 1 l ) for the valence configuration of 25Mn. Be sure to label the subshells (e.g., 3d, 4S). 1L was so: 5' d. The valence configuration of the 25Mn2+ cation is 3 fig . G. e. The valence configuration of the 3gSez‘ anion is q‘fpl‘l’g . 3. (10 points; 5 points each) Write the complete electronic configuration (152232...) for each of the following. Do not use noble gas core notation; e.g., [Ne]. However, you may write these either in aufbau or shell order. Shell 5181:. 19‘24-1 21:" 34-15159 eé‘oqg’qreal‘o $23-$11"3 9"" 3sz ‘5‘24”: “5&5 “M'Oqccr macaw?” €5L§F°€§d "90.6919; mam as“?‘5L2-9L1r63‘93e‘4é‘w‘°‘*e‘5&44‘0‘55 d: l 0“ r 5).“) lSklsi’lebifiezafb‘t‘ei’figg'oéf‘r’gsl'étoi ”SfbésVWHQJ‘DeFl Robert L. Carter, Ph.D @ 2010 ocw.umb.edu Page 5 of 6 ii Name 4. (24 points, 8 points each) Draw Lewis dot structures, showing all valence electrons, for each of the following. Your work should show a count of the total number of valence electrons. I? Note: Atoms whose symbol is indicated with a subscript are separately bonded to the atom immediately following or preceding in the formula. (You do not need to assign formal charges for these.) 31.303} ,aflg-5l 1 so " I “ 3018 IQ! 21k u. b. HONO (The atoms are linked together in the given order.) 2:; H_a§—§—6. => H~§—§=e> NT-g- -(1‘.C5"€ 5316*6“ '(e‘KysIJ WOOL-9Q c. XeF4 Hef‘ Xe ‘3 \‘f:__}g;'.——:F_\ e953». “ "\ $0 on Robert L. Carter, Ph.D (:5 2010 ocw.umb.edu Page 6 of6 I3 Name_k<47/— 5. (15 points + 4 points bonus) The isocyanate ion, OCN', can be represented by three resonance forms, one of which is shown below. 6‘) Draw Lewis structures for the other two resonance forms (8 points); assign formal charges for all three forms, including thejbrm shown above (4 points); and circle the form that is the least important contributor to the resonance description of the bondin in OCN“. (3 points). [=6—CEN:] _ BONUS QUESTIONS (4 points) Carbon suboxide, C302, is an evil smelling gas. The principal resonance form is :0:c=c=c=i'): There are two lesser contributing resonance forms. Draw them with their formal charge assignments. wary—ca C.—~23 +~> \o—vtEQflQE o: <9 é?) o 6) Robert L. Carter, Ph.D (:5 2010 ocw.umb.edu ...
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