summer 2011 - Name Kg ¥ ID Number Chemistry 14A - Summer...

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Unformatted text preview: Name Kg ¥ ID Number Chemistry 14A - Summer Semester A 2001 Midterm #2 Question 1: '3: 2 Question 2: ‘3 Question 3: 16 Question 4: at Total: 95 (95) You have 50 minutes to complete the midterm. Equations and Constants; This is a closed—book midterm. PV = nRT PiVi/niTI = Pfo/nfTf You can only use an SAT-approved calculator. d=MP/RT PA=XAPM Please circle your Discussion TA’s name below. R = 0.08206 L-atrn/mol-K Make sure the appropriate significant figures are used. 1 atm = 760 mmHg = 760 torr 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, Breathe, and PLEASE RELAX!!!! 1. (37)We will consider the chlorine molecule, C12, in this problem. a. (20)Draw and label the molecular orbital diagram for the C12 valence electrons only. r ( I i /___‘6§P’® ‘14:. 4V W’EEBxL 1L :1}: A—< /_d___‘/ Ah 1]... \\‘AL 111.! (( 3 Q3? \(\ 1T3p®f ( {E 6% r“ 4“ / égym / 11L. / / y.‘ / 2$®~ \ L27 1'2 “ z 35 3 \ G) 5 ( \~\ M, /r Q 635 b. (6)Write the complete molecular electron configuration for the chlorine molecule. (6 \531 (6 13* >1 (633 L C62: >‘ (<3 JOE»)? TL: >362? <6 33 )7- L (g :5 3L (6 3‘32 (W3 93‘? UV??? @ 4 P15 C3 #1“ Leif—1‘ Chg—n1 VMW%“TMEZL~3, c. (6)Calculate the bond order for the chlorine molecule. Does the bond order agree with the number of bonds in the chlorine molecule as predicted by Lewis dot structure? Explain. ._ zfl-W 9-94—4330.“ . Eton "3'00 : ¥¢ l r_______.‘”"\‘ %%o . Clitofimh~ sfiérgo :\ M Q Clo-Twang ’10 : “5’16” WMWM 6‘ Cam-Yjfiwahsu I _— Eficl‘ é luvs. d. (5)]ustify whether the ion, C122} exists using molecular orbital theory. ma exme“ cfy Ci:— Cnlc H-O ALW, Sets 504m.) om Mb. _ I Q\:— MMMQL, (AR M-O.W%\Cll— ¢M 2. (18)Predict which of the molecules, CH3F or SiH3F, is polar. Support your answer by drawing the VSEPR structures. If both molecules are polar, determine which molecule is more polar and explain. Show the bond angles and the direction of the net dipole moment for each molecule in support of your answer. toms“ l (C was“ \ \ \ ‘ ‘\‘ H‘ \ _ A ’9 H l [:3 {lax H ‘4 H 3. (16)Certain metal carbonates decompose to form a metal oxide and carbon dioxide. The general balanced chemical equation for this type of reaction is given below where M I'CpI'CSCIltS a metal atom. MCO3(s) —> MO(s) + C02(g) A 00902 g of a white, solid metal carbonate is heated and the carbon dioxide product is captured in a 285 mL flask at a pressure of 69.8 mmHg and 25.0 °C. Identify M. n = % : (0.0m8cd'u—3CQ.’L%SL3 _ aozgms be“ _3 (0.0%LOB L’Nth- qu_ ~ 14.95 L-u‘k_. = \.OB‘\%xtb KHQBL \SK) 5 do Q01 1.0g \ '3 W °\YS)<O »&%Cozxw3_: 3 LOGS: Xtc; ~93. HQO lwcoi \®\~3 C). OQOH “C03 1.09m |O_3u~_..u_ MC03 = *W b e 3 - $4.3m %/_.,Q M 0’“ “i Q03 ~ 40 OOQL‘/% Mass o? M = 84 3t 359‘ ~ Moss's tree Mass a? H: H33“ 3 Q) . (24)For the following problem, refer to the coordination complex below: [Co(NH3)4(N02)Cl]Cl a. (6)Name the complex above. (Note: Spelling does count.) jefilowmnmmmumm Q3 Q3 ® ® Q Q G3 b. (4)Determine the coordination number of the complex above. Justify your answer. Q) . mmme—a “new m...“ A \‘iadahg‘, L4 HH3)\M01\ \Ql“) Wang? Tu... (Ll—MAO @ c. (6)Determine the hybridization of the metal center in the complex. Justify your answer. (Hint: Drawing a rough sketch fie complex would help GREATLY but not required.) m Ce; sfd? TWOAQL d. (8)Determine the orbitals involved in the bonding between the metal center and one of the NH3 ligands. Explain. o n c3: 33>3A“ car-mtg. .363 TMNMMH‘gBMr:- {L "a 3 e. is Awe Axse VSEIKN). @jW)W\Cc—NSH3 (Came—31am “kn-+33% SEBAL \u‘lmicL orb—th 'Co 37:3 Mbriamktm.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 2011 - Name Kg ¥ ID Number Chemistry 14A - Summer...

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