2010 Exam 1 Crib - Name TA Chemistry 241 Spring 20 1 0 Exam...

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Unformatted text preview: Name TA Chemistry 241 Spring 20 1 0 Exam 1 CH Section You are responsible for all information on this page. Show all work on the exam, and write answers in ink. Clearly indicate your answer and mark through any writing that should be ignored in grading. There are five questions and one bonus question. You should also have a Periodic Table. Potentially Helpful Information E = ~(l 3.6 Zz)/(n)2 Energies of a hydrogen-like atom in eV E = hv = hell A hydrogenic orbital has n — 1 total nodes of which (are non-radial nodes. 0 = 2.998 x108 m s“1 h = 6.626 X 10'34 J 3 mass e' = 9.1094 x 10‘31 kg 1 J molecule1 = 6.242 x 10:8 eV molecule“ Slater’s Rules Z c 0i = 1.00 for e‘ in (n—2) shell or lower oi = 0.85 for e‘ in (n—l) shell Ui = 0.35 for e‘ in same (ns,np) shell 0i = 0.00 for e' in (n+1) shell 1. (16 points.) Orbitals of the hydrogen atom. A. The 2p(y) orbital of the hydrogen atom has one angular node. Sketch a contour of the orbital on the axes provided below and shade appropriately. B. Sketch a contour of the 3d(yz) orbital. Show all lobes, and indicate the algebraic sign of the wave function for each. Also identifl the not: surfaces. ‘w’ XEQEQfl/AL QM C. Draw the angnkfl'd stribution functions for the 2p(y) and 3d(yz) orbitals on the coordinate system provided below. Be sure to show any difference(s) in the two plots. Also identify allradialnodes. Z? 244 ‘20 cadrde .3_,L__L 1 O \\ (18 points.) Atomic structure and periodicity. Identify the atom (or ion) associated with each of the following electron configurations: 5 3+ i) [may (a M“ ion) Cv ii) [Ne]3323p4 iii) [m13d10452 2 .4 iv) ‘ [He]2s22p6 (M‘ ion) - ‘1 The following is a scrambled list of second ionization energies (M+ —’ Mfi) for the three elements Na, Mg, and Al. Assign the correct ionization energy to each M+ ion and explain your reasoning. 15.04 W, 18.83 eV, 47.29 eV Nair are} 252$ I f M EH23 252 iii 3% Ml i l“, i A64” ZSIZQQ 33L l8~33w E63 F“ M filth/“5+ 3‘3 6 HME‘M «(Sum/«6% LNQVCV temofii CW elm- 3. (16 points) Complete and balance the following reactions: A. Mg3N2(s) + 6) H200) a "5 Mg [62) ML (full #- Q N H5 B. BaC2(s) + QHZOU) * Ba (at) flail Jr #CCH , . i _ c. K(s) + H20(l)-* K mien " L “L. D. Lime) + 04g) 4 A LL 10(5) 4. (16 points) Draw Lewis structures for the following and predict the structure expected for each isolated molecule or ion. D. XeOF2 l "x 7&9": F l 5. (14 points) In the gas phase, it is possible to isolate and study Sr2+ complexed to various numbers of water molecules, e. g., [Sr(OH2)x]2+, x = 1—20, in a mass spectrometer. The structures below represent theoretically predicted structures for three of the species. A. Ra 'onalize the three structures shown ab ve. For example, if one\‘f the B. Propose a sensible structure for the x F 14 complex. Be as detailed as you can and explain your reasoning. / ‘N k“ We Cm Co“ ‘ H 3 “LC \‘i'DWiv ‘ a 06) “to” [tw- “let/“Swim SW We“ troll». . waif/t3 W M' q fink V‘ “‘1 Pr Bonus. (2 points) Radiation with a wavelength of 58.4 nm interacts with a hydrogen atom and induces the ejection of an electron. What is the kinetic energy of the departing electron in eV? l8 . ' ‘ ‘ eU » 3‘; x (WSW - sth KC— .3 ...
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This note was uploaded on 03/20/2012 for the course CHM 24100 taught by Professor Professordavidr.mcmillin during the Spring '10 term at Purdue University-West Lafayette.

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2010 Exam 1 Crib - Name TA Chemistry 241 Spring 20 1 0 Exam...

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