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Unformatted text preview: Name ___&‘d_________ I ID Number Chemistry 14A - Summer Semester A 2001 Midterm #1 Question 1: “9 Question 2: 'Qfi Question 3: LC) Question 4: a it Question 5: 34; Total: You have 50 minutes to complete the midterm. This is a closed-book midterm. You can only use an SAT-approved calculator. Please circle your Discussion TA’s name below. Make sure the appropriate significant figures are used Show all work to receive full credit. Circle your Discussion Sections: ~ T Th 8:00 — 8:50 am Keith O’Doherty T Th 12:00 — 12:50 am Tom Miller W F 9:00 — 9:50 am Gil Afonso W F 10:00 — 10:50 am Mo Arellanes Please sign your name Good Luck and Remember to BREATHE!!!! 1. (16)Use the electron diagram below to answer the following questions. a. Using the atomic energy level diagram above, draw the ground—state electron configuration for the element gallium. b. Write the complete electron configuration for the gallium atom below. Also, circle the valence shell. ‘3 7. 251 Zvlsgs‘SP" 3 dm 3‘49‘ c. Determine the most probable oxidation state for gallium and write the short-hand electron configuration for this gallium ion. cm” [Adam J L... 3 t g 7. , 7, d. For the orbital labeled “*” in the diagram above, write a set of quantum numbers that properly describes the electron in the labeled orbital. “ *3. n=3’ QM, Mg: (3 Jm‘=_1 4‘ 2 2. (20)Draw all possible structures for the molecule, N20, based on the Lewis Dot Rules. Determine the most probable structure using formal charge analysis. Also, draw all resonance structures, if appropriate. '3 AW : 15199. "H 0% onm e-‘s ‘. \(5 on 1N=N= ’3: b) KiEN~<§z 3 e) 3 “ . . 'H p Peas—(“*éiL9330 Tor sway; 1N=¥l=dt 3: ~ 1 — "FA. 2 .FQ_5_<LH§U*»=_‘ Pc 5 to 10m 4| ‘ 2 1| -\ RSWQ}. NE N_~6:(—-Fc=g-cg-+LQL)3=-l FQ‘S‘Q--§(c)3=o "’9 T h -“ FQ35-(0*5i8))=+( 3 Tut‘s . ‘3' fl *‘ « FQ=S-((* {1(1)}:a—~J It — FQ‘$"CD* {aha-q 3} 3. (10)Explain the following atomic and ionic trends. a. The first ionization energies for magnesium and aluminum are 738.1 kJ/mol and 577.9 kJ/mol, respectively. H3 .. lsiz‘tzFflggl M ‘50.»; 0.55.944; \31 W... A‘ 1 ‘31 B1..ng 33L3?\ ‘5 WM “Ma “th‘e‘um Qka. m M b. The ionic radii for lithium and beryllium are 0.60 A and 0.31 A, respectively. Ll.» vs 3:13 I On :13, 30:. w W Mal. L3"; \e' {a W. 15.9“ M11. Goa \m'?r5t°.~'u._. 9) L‘ W 152:» New ze-QIQ-Pw'tm VGA-1:?“ L:\7'*Mb W 9-91 7.6 913W) ’3‘- Wh...m¢wg .‘U- :r'. 4. (24)Many metals react with halogens to give metal halides. For example, iron metal gives iron(III) chloride upon reaction with molecular chlorine. a. Write the balanced chemical equation for this reaction. 29-. Q Fe~ BQl‘* 93:10 < 2t \ 3 \t—nuqu‘) b. Calculate the mass of iron(III) chloride that is produced when 10.0 grams of iron reacts 14.6 grams of molecular chlorine and determine the limiting reagent. Show all work to receive full credit. (5.0% F: x \-+°~Ft = 0".” at”, Qua—.934:ng gawk—F1 = QA‘IQ TfiF‘QS one—«mack x tux-la Fem; _ ' Pic-)3 -=. ZQ-Oq‘ FLQJ-s 91‘s“ l0.0%:§](‘. ,‘ ‘H—D- Cl: = o ’74:>.‘ia git "‘05 N-QQLL): aw-Wchs \.: O.\ ~69 3 HQQ\I 3.7 RQLs ‘ RQLS z 2.2-3 3 RQsfit-cn-lkkqull—j‘l LiHl'tthngl‘E-kcqem 3 Q\ 3! MAX HAsc or RCA: PEODDL‘EB‘, 22.33r :l l c. Calculate the percent yield if only 4.5 grams of iron(III) chloride is experimentally obtained. Show all work to receive full credit. actual \ ‘8 90 yield. '“Ji— X\QO‘. ' Mfr—Tied yield = us - E3;— >c \o-o 9. u. 90 3 3 (1. Calculate the mass of excess reagent that remains at the end of the reaction. Show all work to receive full credit. l I “Mr Q‘w— " “MG =o.?_06 week a: L4H“ = o. B751; F: 70350.. 3-...QQt‘ O'r37v—v9-Flgy Q5 4:: . l R 75-73:: mg :1 e U3 .ng F _. w= lgggakggc L '2_ 5. (20)Leaded gasoline contains an additive to prevent engine “knocking.” On analysis, the additive compound is found to contain carbon, hydrogen, and lead (That is why it is called “leaded” gasoline). When 51.36 g of this compound are burned with oxygen, 55.90 g of ' carbon dioxide and 28.61 g of water are produced. Determine the empirical formula of the gasoline additive. Show all work to receive full credit. FPbxcy “z‘ 015—“ c131" H‘L—Q $3.953 Q01, Isa-1(1); =. \.2:70-——.9. on x \b-vflQ ‘LD‘gQ‘. ‘P‘inO‘Q‘QOL I lMlQO‘f l‘f'o-LQ_ - m 59:: 2%. \ H . a, thorn-go .flfi' =3.?_Ot%\.\ \ 593’ MOM via: l-Z70~o-9.Q \- ‘ELQ. Q.lS%&._..n_1>\° ‘ Hug j 7.. 3 a . . Q 411% we“: 2., H TM i”me O-\$%%h—o—°~'Pk [—pk J?- ‘\L——3 ...
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This note was uploaded on 02/08/2012 for the course CHEM 14A 142042200 taught by Professor Lavelle during the Spring '10 term at UCLA.

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summer 01 - Name ___&amp;amp;‘d_________ I ID Number...

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