test_1a - 3.091' Fall Term 2004 Test #]A 1 page 2 Problem...

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Unformatted text preview: 3.091' Fall Term 2004 Test #]A 1 page 2 Problem #1 (29%) (a) In box notation, give the complete ground-state electron configuration of each of the following gas-phase species. You may use noble-gas abbreviations for the inner shells, if you wish. (i) Na3" (b) Give the chemical identity of the species with these ground-state electron configurations: (i) a neutral atom with [Xe]4j‘”5d'“6526,9'!2 (ii) an atom with net charge 3— and [Ar]3d'04524p6 3 (iii) an atom with net charge 4+ and the PBS spectrum shown (c) For each of the following pairs, (I) identify the larger atom or ion and (2) give a brief explanation justifying your choice. (i)KandK+ ( (.3. A?“ m [73% M 14 WW [6* x: [H M9 “3 We (ii)ArandK+ .1072, mm éflMflmm W ("L M fifl+ W $W/‘ngf ‘,_ ref-W Mm #0. 6" => fir NW 3.091 Fall Term 2004 Test #IA page 3 Problem #2 (14%) (a) Sommerfeld introduced two new quantum numbers, I and m, to address certain shortcomings of the Bohr model. By invoking either if or m, explain the observation of Michelson and Morley that in atomic hydrogen the line associated with the transition from n = 3 to n = 2 is in fact a doublet (pair of lines at almost identical wavelength). ? we flew WWW We MM aim (m :w éwfl/ meme“ flay] final/M1 >4 3hr Mm 395’ dEé «m. if. dgfal an Chara: (b) Making reference to the underlying physical principle, describe how a beam of palladium anions (Pd‘) would behave in the Stern-Gerlach experiment (passage of a beam of atoms through a divergent magnetic field). 3.09} Fall Term 2004 Test #)'A page 4 Problem #3 (34 %) (a) The first ionization energy of neon is determined by photoelectron spectroscopy (PES). Calculate the wavenumbcr (v) of incident radiation that will result in the production of photoelectrons with de Broglie wavelength (7L3) equal to 3.091 X 10—10 m. film‘de mag 23 m @ Mars efiww W W " é-aM/m: Em» +5“? "' 9/" 2.. %¢W— 2”“, ?’m :6?“ at: ’% ZM/LJL X "E: «42' IE. => 517~=(’4: +179- CV XIIA: + '2'”\3 JG, .7. ._ 7;: C65)”; 3*) 2' +(Zl- EPXAGX/O-i/écwo-yicBX/o‘j ,2): Wit/6'39: awn"? =- Stow/07¢", (b) In the emission Spectrum of He+ calculate the shortest wavelength (7L) involving electron transitions between 11 = 3, 4, and 5. K ’1 ' WM >l-=>WAE 11 ES" : I “I 5* u—L” 22 W”! I )i 47* Q $2. ’7;- -I 5:3 3 :/.lK/07(l)z J; - I; 3 5 :1" 3.10X/D m- 3.09! Full Term. 2004 Test #114 page 5 Problem #4 (23 %) The reaction of alumina (A1303) with carbon (C) can produce aluminum (Al) along with carbon monoxide (CO). A reactor is charged with 99.9 kg 01" A1203 and 22.2 kg of carbon, and the reaction is driven to Completion. Calculate how much of each species is present at the end of the reaction. Express your answer in kg. 46203 743$ Fe- 2A£+3€o ,«m. ’46:. 26.98 4903 == rev/fie 0-: '00 C 5 (2“?! @ = 2—8-0/ 77, 7,? 4403 + 22.2% c, %.,L?,ma I; erg/9160 939 W 49?? MW 9650.- AWQ = /.-/87 c: /:3 dw‘mfl (3 72mm «,4 % %03W :9 C It: Jim .1 We, mfgomiglfm C @913 W a m‘// we; «Wde flég fi/bdacz agxxg¢gmm$ ’izzxazw 4% M Jé’Vg’W 60-58271 -C’0 ‘aécé 979+”; = /z2-/ ...
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This note was uploaded on 11/02/2009 for the course CHEMISTRY 3.091 taught by Professor Donsadoway during the Fall '04 term at MIT.

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test_1a - 3.091' Fall Term 2004 Test #]A 1 page 2 Problem...

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