chem321.exam4answers.summer2014.PDF

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Unformatted text preview: This examination has 7 pages, none W“ blank CHECK YOUR COPY! You may tear oil the last page, which conta relevant equations, to be used for your reference. The examination will be 1 hour 35 minutes (95 minutes) ong starting at 10:00am and ending at 11:35 am. This is a dosed-book, closed-notes examination - rm programmable calculators are permitted and may be necessary for some prob ems. Regradereq estsareduewitbino eweekaltertbeexom' re MW— Please indicate if your answers are on the back of any of the foil rnedtoyo . wing pages by re tbs, a y u i i ohecldng the box next to each page of the examination. l yo or answers you write on the bark of any pagewil fro" Fgll e . Page 1:. D lageSd' D ‘ “_PageZ . D5. Pageéi D Page3 _D .Jagel D . . ldi Pagel D Problem number Point value 1: Atomic spectroscopy 20 2: Mass spectrometxy _/20 3:0hromatography 90 20 Has chromatography 94420 PMS bx : owxol Mots - I Q _ Spectr 'ii ii iii iii Why is it important is have a constant temperature for iii-ABS? Why is temperaturesontssinotimportaniioriiiiii 3 Name om We??? WWW? WWW mm c. Why do atom abso tio spectrometers spectraliniiiissismse‘isimisonprsb bieminatsmisemis ssiosspestsometers .What' is sestraiinteriersnse? . ~ gpwimkws WEJIMW m ierensfinan method WW; m Semis M twusi‘ mi N iigssssaiiyisassssusiiiewise nsoiuoi W :4 - MCN‘ «W - ' ' We. camerasW‘ chem a M X Wadi WSQWAS ix) asmLtfi s-i aisles-cw wired wiles) “‘0 am Hi kw W+ is m a Maw ..__ sin-9 a fit» “WW“ 03w ‘W fess 59 “it. {or awoufig f um) wmmm o , "5 Lo missveifi‘vs; .‘P‘i masks; UM? ‘ 0n the last page of the exam is the El mass specnum of isopropyl bromide - CH3CH[Br)CHa or Cal'err. a. Write the balanced equation for the M+ peak at m/z = 122, making sure tha any cations, radicals, or radical cations are written as such. b. How does the peak at m/z = 124 indicate the presence of bromine in the molecule? c What is the most probable structure for the species detected at m/z = 43? Clearly indicate whether the species is a cation, a radical, or a radical cation. (or) ‘ [CZHaQVl ‘l‘ e“ --—a [Cgugcfll’ e is i) I“ u "M ' WNW s SW19: ll: aw»: djhlllililllghll‘llllllllflllllllhllllfilll - ® speller. t (L) R (N (moving «r [C Hall‘- leg ‘Efi a lbv ‘loclly Why are El and Ci methods not suitable for high mvmcxlfr weight lleCii-‘Sfi .. EllC'l «13qu M Winkle-l Qméfivti plank «7“«4’1 l I pn‘pv 'lv tow-10W“) cowl longs MW £91?!”an m mlcil‘lL meow W 3’ llllllllllll ll lll xv Elma-om dud. l _ Lilly l Consider the chromatogdem on the right Which column has fewer theoretical plates? 1 2 ne'ther Which column has a larger relative retention? 1 2 neither Which column gives lower resolution? 1 2 neither Which column has bettfr efficiency? [email protected] 2 1 neither Which column has a larger H? , 1 1 Which compound has a greater partition coefficient. A B ne' e Which compound has a larger retention factor? % IE: “genre if you halved the length of column 1, how would N, H, and R change? N K limb-col H um dnaxmsLoQ. l), okay-cam s Sketch a Van Deemter plot, being sure to label both axes of the the Van Deemter plot does equilibration and mass transfer beco l E:lw=hc/l FOMILAS T h:6.626x10'34Is;c=3.00x10“m/s Spectruphotome Plancksequafion: 2- h. I In I co :l% -=2 S whereNispopflafiunandgisdegeneracy k=1.38xlfl'?3]/K m . Chroma graphy: K = [XJSP partition coefficient Din“? capacity factor '51:! 171W 6: = tRb = tR=b—tM selectivitgr factor 41- . tR.a tM _ _ m fljeoretical plates N — 1 ' w2 1. plate height H = ; resolufion R = A R = —N 219-— 1) W vg 4 tra. Van Deemter equation H = 453 + E + C 11. >5 #1 9 GD 60 4.4 .5. 0’ .2 +1 .9. 40 0 DC 20 10 20 30 40 50 60 70 30 30 100 110 120 m/z ...
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