105as07_e4_key

105as07_e4_key - Chem 105a Examq- Last First Initial...

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Unformatted text preview: Chem 105a Examq- Last First Initial Tuesday, April 17, 2007 Last 4 digits Student ID# __ _ _ __ Professor Stephens Lab TA’s Name Lab Day & Time: Major WPlease sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature: INSTRUCTIONS 1. You must show your work to receive credit. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). . YOU MUST Use non-eraseable ink. . There are 6 problems on pages 2-9. Please count them before you begin. Aw (15 pts) The following is the molecular orbital level diagram for NO: 9;: W29 r 4+ 63p «‘2? * «is 1? 6.25 a) Label each orbital (es): (extreme? (rte? c) Write down the electronic configuration for N0+ (“3.92 (of; ) 2 C “29 )¥ (0‘29 )7- d) Write down the electronic configuration for NO' (03:)2 (at: )1 (szyp (62? )1 (“:9 )2 e) Which of the following molecules/ions are paramagnetic? NO / L w 9 «(a \ (hc‘wb - O ch.\.P{\ Q‘CQ‘V‘V‘é NO' \/ Q. wc:w1\ (Morrow: 4- 4— “in? i) What are the bond orders in the following molecules/ions? I NO 2 , 5 NO“ 3 NO‘ 2, “,5, ,-2..,»~«V;u,~ gm; w.“ .-.. y, 2 id '51.. ...t;:;&” azifluzmwm 7, - mus; I . 1- (r. = c w s. 4 mr.’ {:73 w; .1 4,; {an a ~, v , “mamas; a» :22. 4 - (20 pts) What are the Lewis structures and geometn'es based on VSEPR of the following molecules?What are the hybridizations of the central atoms in those molecules? a) BF3 ' " F E {s ,fifzjf; 11': u dspg - ' mm kblm'éiacg (24 pts) What are the Lewis structures, and geometries based on VSEPR of the following organic molecules? What are the hybridizations of the C atoms in these molecules? a) Czfis H H H 'H \c c/ u» ." .' ‘. LL" ’ "' H09. 9’“ H H Q’ hMNMk ’- BM C eh m g?2 b) C2H4 “r. "H “\Csc, 1+ 'c:°- 9. / ‘H (12 pts) What types of inter-atomic/molecular/ionic forces are predominant in the following solids? a) calcium fluoride \0 NC. b) carbon dioxide (dry ice) Vau-(S-u- WQb/L-WAQK N29“?wa c) iron NW0 / C WG—KLvA" d) water (ice) \AAJOKVOW" 3) graphite _ 9 CcNvaA— C‘“ 2‘) ) 2.) Wwv'Mr- VJde / tomb“ mpg“... (h; an! DMm‘uw) 7 (16 pts) In each of the following groups of substances, pick the one with the given property. Explain your answer. a) highest bpiling point: HBr, Kr, C12 HQ‘r ’ New. km ma; fimm c) lowest freezing point: N2, C0, C02 CO Lo, Bunk—6de (fun-.4 N NZ k-Ds kWAOw Aqflnfl'mn 2. (W CO; k0“? LWAJ-A 6‘19..an m»: EWMME‘M \L. N; (move, Q—uLCQz) d) lowest boiling point: CH4, C2H6, C3Hg QAQA \Mduwh. “’7 “‘3 L‘Mh“ 6Q &\‘°v~ ifiiwufl CH1;- C‘hfy‘; *6... JMM out/14.va MR {at W 1“: “l- e- S “a (.e_,_ w-uluov 6. (6 pts) Draw the phase diagram of water. Indicate: a) The triple point; b) the critical point, c) the boiling point at 1 atm pressure. | Cl"sz P 0 ...
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105as07_e4_key - Chem 105a Examq- Last First Initial...

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