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Midterm answer key chem173A 2009

Midterm answer key chem173A 2009 - 0a 30 2009 Name Mar...

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Unformatted text preview: 0a. 30, 2009 Name: Mar. Midterm Chemistry 173A/268A Fall 2009 l. (2 points) A few atoms of a new element were recently identified as a product from the fusion of 48Ca with 242Pu. (a) Write a nuclear chemical equation for the formation of this element. (b) What is the product formed if this element undergoes alpha—decay? l‘: "2 ea) “‘2': (A vakflye MmeM 19:7 Mmm '19 Q Q? “L? _ 35:} 0 it t ‘07 “WAVE,” 'me‘k‘} ii»: i: fig Mesh 1W ”IL me 2. (4 points) The electron configuration of cerium (Z = 58) is [Xe36sz4fi5d15 whereas that of praseodymium (Z w 59) is [Xe]6sz4f3. Rationalize why the eiectron configuration of Pris neither [Xe] 6324iQSd1 nor [Xe] 6324f15d2? f- A m LEQ Oféiwgwhh mfg. iidafl’éfi.‘ (Sm-fig“ fimrife‘kl‘“? 25‘ imm‘ Aggflgf‘ 2:35; . £5 . . 6 ML . M Cfifw’l QZ WameM 'QNV‘W- Lt"; ”:9 Lea ) MiflMM 5 éewggemtn-Vt Q’Q-leA-W Mag Kg“ g & Esfléfiflmfi‘ (we t‘EL’k “Ml/i 19%;“ if lever» in g) i AS SMJ‘U M [M ee We Wife! we aMM MMMMM east M MW % a; lair 3. (6 points) Which 3 X 3 matrix describes the foilowing symmetry operations: (a) C2 along the x axis (b) C; along they axis (c) 82 along the x axis I: “ l: , Oct. 30, 2009 Name: 4. (6 points) Plots of ‘atomic radius vs. 2’ and ‘ionization energy vs. 2’ are shown beiow. Each exhibits a series of peaks and troughs. Explain Why this is the case. Atomic radius, r/ pm ionization energy, lfev Atomic: number, Z 050;“? dwtfwfif‘s as me 5. (4 points) In order for a set of elements to form a mathematical group several requirements need to be met. List one of these requirements. f m Jr... View :2; twig M g“ g t” i 1m» i t Na. it». LIV egg“; 'ibwf'r ham-‘1 ‘2».- ‘ (Q . i flew-“323g" tie ewe-smeifi w/ 6%“ Withers 6M 64$ i. l . Eng; 5"”, vi!" 3? ... . fiw/tenri‘. . Mai (L) em deem . E .r’ 1 16- \2 "“‘ is“ gs r {es ,tC P L_ «J r Oct. 30, 2009 Name: 6. (6 points) Draw the Lewis dot structures of the following moiecules, and use VSEPR to predict their molecular shape. (a) Ker Ff I I x 14’: \ MW“ e \r‘, I F (b) 861312; (43? {J M fig: 9 “3M ' flew“) ‘éw’ E W (C) 03' !J \ ‘\©‘:’LO .3: .3 bfimf‘F Oct. 30, 2009 Name: 8. (12 points) (a) draw the symmetry operations and determine the point groups of the following molecules: (b) (1 point) Which, if any, are chiral. Oct. 30, 2009 _ Name: 9. (8 points) (a) BB is a highly reactive gas—phase species. Qra_w the orbital combinations and the molecular orbital diagram of BH arising from interaction of the is atomic orbital of H, and the 2p atomic orbitals of B. Assume that no 3—1) mixing on boron occurs and assume the boron 2s orbital is non-bonding. Label the resulting molecular orbitals as either 6 or TC and as bonding or anti-bonding. if) a K H flow was“ H ”Jrif 0/ Mimi (El/74%“ 1 ~ - i étmqhb' ‘4'? 2.3 e «{3} H ml 9 (b) (1 point) What is the B~H bond order? gm . “C3 agriwngfi (c) (I point) is BH paramagnetic or diamagnetic? 33% am.m mm are? e k (d) (4 points) The first ionization energy of H IS I3 60 eV and that of B is 8. 29 eV, however the first ionization energy of BH was determined to be 9. 77 eV is this value expected based on your MO diagram? Why? NV f if W‘W [5.1; «6 2i {3an imi’i/‘A. €65 - {1“ u ‘ ,. fir 5..er iii if...) r} i “More “319% WQWQ “ah/E’WM (f “lib-(«mm ii i if}; L “NV/WEE A‘Sflqflawflf {g ‘0“) likable? : J ’ mi) gp tom-W9; iflfi [is afletv‘lf‘h Ci J if} “3 «if E Q 4’: {1 J b ‘35/ A (”3: :_ 915"“! art , 0., E193 {:fixflfi 5 E54”??? {6“ iflzgngfi We... Vii i W 5'! ...
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