Ch115_T3C_F06_Key - Page 1 of 6 7 Name K cf, E’lease...

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Unformatted text preview: Page 1 of 6 7 Name K cf, E’lease 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. If this test packet is defective, ask for another one. A separate copy of the periodic table will be distributed with this test packet. Feel free to use it in conjunction with any test question. DO NOT WRITE BELOW THIS LINE TOTAL Robert. L. Carter, ?h.D 9.310 ocw.umb.edu Page 2 of6 Name as . (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 mi, respectively. Which set is not permissible? 2,1,1 3,2,0 3,1,—1 3,0,0 . Which one of the following is not a ground state configuration of an atorn? 132252211!)3 ” [Ne]3sz3p"3d5 1522522}?6 . Who developed the wave equation description for the one—electron atom? 1522.5" [Ne]3s' Pauli Hund deBroglie HeiSenberg . Which one of the following orbitals has two nodes? 43 15 2px 2: 3d” . Which one of the following has the largest lattice energy? Csl CaO K20 BaS . Which one of the following configurations would result in a paramagnetic atom or ion? 13223221? [m13d'0432 [Ar]3d“’ [M432 . Which one of the following atoms or ions is smallest? / - Kr Ca ( (303+ (202+ Br- . Which one of the following would have the largest first ionization energy? / ED 1 As Se Ca k Robert L. Carter, Ph.D G 2010 ocw.umb.edu Page 3 of6 T Name K 63.?! _ i. Considering the Lewis-dot representations of the following species, in which one would the central atom be considered to be electron deficient? j. Which one of the following represents a 361;"); orbital? Bot; Xer PF5 k. Judging from trends in electronegativity, which one of the following bonds would be most polar? l. The two Kekulé resonance forms of benzene are shown below. 0%: On the basis of these forms, which one of the following best describes the real state of the carbon—carbon bonds in benzene? O—N I—I Cl-Br Cl—N Benzene has two bond lengths — a longer single bond and a shorter double bond. M... . .u/ i C=C double bond. M- 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 — about the same length as a C=C double bond. All carbon-carbon bonds are the same — about the same length as a (la-C single bond. Robert L. Carter, In All carbon-carbon bonds are the same — shorter than a c_C bond and long@ Ph.D G 2010 ocw.umb.edu Page 4 of6 1' Name 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 4.924192 is G‘ a. . (—4 i A .g, b. The valence configuration of 24Cr is (a . C 0 l2 at (all c. In the space below draw the orbital diagram ("line-and-arrow" notation; e.g., 1 L l for the valence configuration of 2TCo. Be sure to label the subshells (e.g., 3d, 45). it: fiiJ—LLL 45 Av...“th v Kat d. The valence configuration of the 23-,C03+ cati0n is 3X. ?L e. The valence configuration of the “582' anion is 3 5L 555 . 3. (10 points; 5 points each) Write the compiete electronic configuration (132252...) 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. Sl/VC“ snsn lgllézlg‘DBC-nl 36'; 50930 L’r‘aL‘legtpl-‘X Avg $18 $2" Drag-er MP0 lfillfiil-gbfigbgéaplm’tbl 54* IDA-FWS—S‘LS {.gA‘ObQ—fial ‘1' q 2 1 é 'L I L hwfgbm sobm lfizlszz—f“ 75‘: 36bit?) Bd'oq-f S‘a Ltch’gq; or er 84P0 ‘93“ is?" if 5%sltbdvbfitsz'5dmtt 62" scram! ‘° 56 ‘° ac} CH ‘Lrgpt'aényfi Robert L. Carter, Ph.D 6 2010 ocw.umb.edu Page 5 of 6 1, Name \< 97/ 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. If 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.) ' 31.903} \BHPJQ 5 PS ’“ l %ot8 \91 3:3; 20, b. HONO (The atoms are linked together in the given order.) H II n N "" __ H r, —-- \' 2.011 H'flcfimmfig ‘9 HEQWNH’O/ Ni -P”c,l' elseizpbt £4me marital 1% 0‘ a; C. Br]: H F—w :‘ 3 I \E wbr“ K‘l Br? } "H 28 '" Robert, L. Carter, Ph.D G 2010 ocw.umb.edu Page 6 of 6 Y Tiarne E; g: 3! 5. (15 points + 4 points bonus) The thiocyanate ion, SCN‘, can be represented by three resonance forms, one of which is shown below- [gem] - Draw Lewis structures for the other two resonance forms (8 points); assign formal charges for all three forms, inc-fading theform shown above (4 points); and circle the form that is the least important contributor to the resonance description of the bonding in SCN‘. (3 points)- BONUS QUESTIONS (4 points) Carbon suboxide, C302, is an evil smelling gas. The principal resonance form is =6=C=C=C=6= There are two lesser contributing resonance forms. Draw them with their formal charge assignments. ill :, Quezofla 4—- l0'”C)E.C.“"Q“-E.O¢ (ED 0 (-9 {—3 Robert L. Carter, Ph.D (-3 2010 ocw.umb.edu ...
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Ch115_T3C_F06_Key - Page 1 of 6 7 Name K cf, E’lease...

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