H2AF09Ex2Key

H2AF09Ex2Key - [\ Name HOLV‘O‘A page 1 . 2 Chem H2A -...

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Unformatted text preview: [\ Name HOLV‘O‘A page 1 . 2 Chem H2A - Exam #2 11/20/09 -- R. Corn You have fifty minutes to complete the exam, but d_o look over all the problems before diving in. Please show all of your work; no credit can be given just for the answer. Some information that you might find useful: Avogadro Constant = N A = 6.022 x 1023 molecules Mass ofan electron = Ine = 9.109 x 10'31 kg Charge of an electron = e = 1.602 x 10'19 C Speed of light = c = 2.998 x 108 m s-1 Planck's Constant = h = 6.626 x 10'34 J 5 Electron Volt = 1 eV = 1.602 x 10-19 J 1 _ (40 points) 2 __ (40 points) 3 __ (40 points) 4 __ (40 points) 5__ (40 points) Total __ (200 points) Name page 2 1) Lewis Dot Structures and VSEPR Geometries (40 points) For the following molecules, please: a) draw the Lewis Structure; b) write the VSEPR formula (AXnEm) and name the molecular geometry; 0) draw the molecule with approximate bond angles and the direct of the molecular dipole moment (if there is one) M A) SiCl4 W— H 7%: 747342 :61} " n I‘ H :(I: a) ,é/ ~§rCfll2 AME; Cl :07 :C’ [J WC]: ., Tcwwtlml " .C, ' 0M aijLS ’07‘50 W0 divolk B) T604 6 +73 : EH l; l, Ax E L\ a) 2.6] an; an M " ‘ C) ’7’: H :‘CTI: gee Saw c: Cl \0 Name page 3 2) VB Theory, Isomers, Electronegativig and Dipole Moments (40 points) Consider the molecule difluoro,dichloroethene (C2F2C12). a) What is the hybridization of the carbon atoms in this molecule 3?} b) Draw any isomers for this molecule that have NO dipole moment. 0) Draw any isomers that DO have dipole moments, along with the dipole moment direction. Name 3) VSEPR Geometries and Infrared Spectroscopy (40 points) Consider the IR vibrational spectrum of ammonia (N H3). a) Name the VSEPR formula and draw the structure of the NH3 molecule. I r ’20 +V‘lfiov‘m YljfaW/VJ“\ /Nx 4 H H b) How many vibrational modes does the ammonia molecule ave? 3M-6 : Sui—6 —— 6 l b c) Is the symmetric N-H stretch observed in the infrared spectrum? M lo Lit/AN“ >43 A ‘5 Chaim-fl ,4 / f \ page 4 Name page 5 4) Infrared Spectroscopy (40 points) The OH radical is an important gas phase species in atmospheric chemistry. The radical 16OH has an OH stretching infrared vibrational frequency of 3546 cm—1. Calculate the frequency you expect for the OD stretch of the radical 16OD. onemqw H:- Loceo l3: 2mm , ,, I ,4 M 35%CW"l = 1320140 7cm at m ; 7.3mm!) m ‘— 7\ 0 (00cm c} c M ‘11:“ C: 2V ’V= A = (.0633 "0 “Z A! _ {6,1‘1‘7‘1'l0073 0” 1577471+loo$ J. \L ’L W; 2“ Ex (2n?) "/(A T K 30,3‘13'26 qmu = Ommm- [dog-104,7 SW3 CW" I<= 703,; u/M 92W I5?“- 2.0M W '3 ,, '— m - , held“: O\‘ M WW‘iwoM — "7333amu: 2.770340%? {or ' l‘— '3 7*“ 237034047 ‘ 7,7‘1640' Hz J L 7. /V Z (VoH M014 0D _‘ Mm) Name page 6 5) Molecular Orbital Theory (50 points) Consider the gas phase diatomic molecule 02+. Please draw the MO energy level diagram for this molecule orbital correlation energy diagram for this molecule, and write down: a) The valence shell electron configuration, b) The bond order of this molecule, c) The number of electrons in the HOMO, d) Whether the molecule is diamagnetic or paramagnetic, e) An estimate of the IP. (Hint: the IP for atomic Oxygen is 13.61 eV) 02 = lQ'l e- : \\ i w!" I #l ___<.~ 4— 6A) 20:126> 20'P 2177, err, .1“; 3H? / _ ‘ \O) 3(35’3) : 5/2. /.—u—.\ “I g“ c) 4, ...
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This note was uploaded on 01/31/2012 for the course CHEM 1 taught by Professor Liu during the Spring '11 term at UC Davis.

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H2AF09Ex2Key - [\ Name HOLV‘O‘A page 1 . 2 Chem H2A -...

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