Exam1.M05

Exam1.M05 - (+1) Lone pair rcpulsiom [5 [e55 # PM.“ purw...

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Unformatted text preview: (+1) Lone pair rcpulsiom [5 [e55 # PM.“ purw apm‘,’ q-f- {30° vs ?fl C+3\) 1. (12 points) For each of the following molecules, write the lewis structure, predict the molecular geometry, and if the molecule is polar indicate the overall direction of the dipole moment. V 2 pay-S MW (gram) Pf. 54 66w Lewis Structure Molecular Geometr Di ole Direction PCl' ,' -, u 2 a: 'I I ' C_\ ct: .C-j + Tnijfih‘tl 1 H30+ E , \ l P farm H H “a H '6 (N'. I CHEF; H \Q/ Te‘l‘mhfidfaj \ r5/ (WU/Md} 8r ooh)th :; r“ 2, (6 points) Given the following possible structures, which would you expect to be more stable? Circle one and explain why below. What is the hybridization of the Br atom? clap; (W 540%!» 3. (12 points) Name the type of crystalline solid formed from each of the following substancesm ( A I W) a. Li d. Graphite (C) malailic Covalth he‘l’luork b- C02 e. KOH Molecular ionic C. SiOz 12 wwagm-i' nc'l'wafl‘k WORM/(«V 4. (9 points) The MO energies for F; follow the order: ,. ’1 3 (7 .1) 4 2 '3 a 5 (02§><czs*Xuzimixnzfi><02p*> a. What is the bond order? («5) 3.5 (HQ-53> i"? b. Based on this configuration, would you expect F; to b or diamagnetic? (Circle one) L; :L Unprntifoai 6 ’ c. Would you expect @ or F2' to have a shorter bond length? (Circle one) /7 (+9 / ‘\ V5 \l/ 4’. 1r}an er bola/i 2 5. (16 points) Complete the lewis structure of the following compounds. For each structure, calculate the number of 0' and 7!: bonds and determine whether or not all atoms are in the same plane. a. CH3 CN H .1 \QeCENi 6) H// H Ell) # ofO' bonds: <g) #offli bonds: 2 Q1 ) All atoms in same plane? Circle answer. YES (+90 #ofO' bonds: 3 # of7t bonds: :L (“t 9x) All atoms in same plane? Circle answer. @ NO 6. (12 points) What is the dominant intermolecular force? (+Aecwl4) a. CH3CH2CH2CH3 % SW LDF Cow Van (Jew WQ/q/IS) b. (:0 d‘ U ‘6‘, (6 IPO [PO c. C6H50H *‘l‘boHCi/‘nj d. H3CNH2 H-lOOmcHAj e. KBr \ovu‘c Cowoer ~clllpo/c accefl‘cdl f. CC14 LB? 7. (5 points) Consider the following amines and their boiling points: CH3 CHZCHzCHzNHz CH3 CHZCHzNI-Iz CH3CH2NH2 77°C 48°C 16.6°C a. What types of intermolecular forces are present in these molecules? H'bohd/‘n? b. What is the dominant intermolecular force? l"l ‘ b 0nd /’/)9 0. Why does the boiling point go down from left to right? 50 LDF‘ ) ngV—P/S ole are“ $3 ace/U 5(h2 [70/ ( (in? (Pod/H" +0 70 £001)”. (Bowl/r Lyra-Hr) dc (fééi/SCS 8. (13 points) Consider the following skeletal structure. Complete the structure, showing all C and H atoms, as well as all lone pairs of electrons. “My Ill C l/ H (’l’ / C \ Q/ H H \ C. \l ll C / C\ / \ H H C\ l H Indicate the hybridization on: [O ’., 3 \ Oxygen(l): 5 l) / c,\- M Carbon(2): 5 r) I H \ 3 H Carbon(3): 5 '0 Carbon(4): 5? Indicate the approximate bond angles about: Oxygen(l): 4' (051a Carbon(2): M i A 0° Carbon(3): ~ I Ocl ” Carbon(4): / l ‘80 d 6% too (10 points) 24gramiof liquid water is placed into an evacuated 2L flask, sealed, and heated to 90°C. For water, AHYap = 40.7 kJ/mol. Show all work. (No work = no credit) 9. a. What is the vapor pressure of water at this temperature? ( l at; - H0700 37ml ,_ _ ~ i” (—15» \>" 8.311%mLK. 363 $43 (or WSchl +0r"\ b. What percentage of the water has turned into a gas? (HINT: See ideal gas law on last page) PvinRT— (o'ofitéalmw L = n(0.08;o(, ,LW'Df‘Lleswk) n: 0.0LH08W/ (Locwg WI —_ 03%?! ° 0.9%, 10. (5 points) Consider the following vapor pressure versus temperature plot for three different substances A, B, and C. If the three substances are CH4, SiH4, and NH3, match each curve to the correct substance. Y A B C fl 3 CHL‘ wwl‘ [5+ I'D]: 635*“: WM“ WP 953" C 1 NH; H’lQMdS ——--———-—> Tem‘oeml'urfl ...
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This note was uploaded on 03/21/2010 for the course CHEM 1C taught by Professor Hooker during the Spring '06 term at UCSB.

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Exam1.M05 - (+1) Lone pair rcpulsiom [5 [e55 # PM.“ purw...

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