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Midterm1Key - Midterm 1 Chemistry 129A Lab lr”...

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Unformatted text preview: Midterm 1 Chemistry 129A Lab January 20, 2011 lr” Name ,__l\_d'>(_____.___—_———— Middle Initial (Please Print) Last First lStudent ID # l 7 a 9 10 N O F Ne 14 16 19 20 15 16 17 18 P S Cl Ar 31 32 35 4o 34 35 36 Se Br Kr 79 so 84 53 54 I Xe 127131 Show all work to receive full credit. 1. Exam consists of 5 pages IO 3. Ambiguous answers will be docked points. 4. Be clear and concise. "4" J"4 4XT 4’4484 ”14711;; c.4c4'u~"74" 4 94 1. Please define and state what the acronym means (,5 pts. each). MSDS- 4‘" 4......» 4 34414447 '0. 44. 544% 1 1 4 ”4:. 10\‘r£‘ . 14“!» IE" “1"4I 14444243 Mg (120“‘f (4 Cuba; A. ,. 5,. f,( L) Q F464 ( I44; [‘7 <2) I'ILV' v I". I” ”if/)2 / (4'3/‘1'4-(1 ‘ ‘(,"‘It 4L7 g l‘xe‘A'IH' 4W4 'ILS/C,(f5 I. 5.4 41,4; (:gfl (:2 f", 1/ Hazard— 44 (A) 44 q €44 . 1.1.1... , 41"} i4; LLc't-«uf Irr/ P, (3ij 47/4446 flukkn Column Holdup- . \ . i . )_: 4:14 ‘1: LV4"" .44‘ (j 4 L‘L‘C)'I‘;{IC\I[ ( [\Q( (141(‘4 (I, 4, I614 1" 4 4 41 4. 445.1444... , 4. . I: (-mwu—«j’nm 4 / ~————-~\c (1‘34 ( 142‘ Q )IIS‘I‘ 44:44 + I)“: . y 4, 1 Bumping— a”). k4 (- Vow . 4,0,... 14411.41? __'4::_4:4:: . 4. r‘-~>;‘" , ICU )1? Lkv‘vd‘ki'lI’ ) 0L \‘ L: 415/41 (4‘4 4' x. ." 4' I 4 \m ”MI“ 44 444: 1%, 4(444e( 6-. ( 44 0+ —\-—~— We“ __ 1, .. -_..\K” k C“ “(C } le‘L IL, 44L. .)< HETP- ““““““““ msfi_~_ “MN“ / ’;1|i\)I\ k 1,2.LLL14"LJ(.IC£1I 'fgj (1 I‘i‘a’glf e (\‘Cm‘* }) I 1 . . 91" _ ' £ :34 4‘.)I7i4“t Q ( (EW‘WIKHIV) £.’¥ ])\?.\‘1Kl’4‘) 71"“ I‘C’,’ , g‘l ,\ «(L 44' 4. C 4‘ 4 4:4 ; , 4‘ ., 3 5,).1 1-1 *9.» .. (task 4‘“) r. Itpl'I‘ ‘1.“ (HQ +4410 f t' < 7L; Q 1. I Astudent was doing a distillation on an unknown mixture and received the following raph from his data. How many components are in his mixture? (4 pts) (JO 4‘) ”“7 / 'l‘cmperalure Volume A student was distilling an unknown % composition of a mixture and knew the b01lin g component of one compound to be 465 K and the other compound to be 375 K. He then found that the distillation took place at 340 K well below the boiling point of each component. What can you conclude about the % composition of the d1st1llate°h(‘lr(_)hpts) 7444c / Cc 141,6 3,4 c 4‘ 444 I z: r 4 ’ ‘ ‘Ih' )4 in: Cl /‘ <>II 4,41! 4', 4&5 It)! k’ C) (”"44“ f: ‘ 4 I, ll (9 (I4 IIC)‘II /( (11"'4(’:) )xI‘; CA '44; H X‘ I? K . \ \ ‘ ‘ v 4 MI X44”? 6" (”3 £1 yes/44 44 «4‘ ‘14 1 1 ‘1. 4. A student was assigned to set up a reaction and the student found that he only had 3 mL of CH31, which has a density of 2.28 g/mL and 2 mL of 1,2-cyclohexandiol, which has a density of 0.986 g/mL. Given the equation please determine the limiting reagent ’ i and provide the mass of the product if the reaction gave a 60% percent yield. (10 points) 7 g OH OCHa . - ,, i . , i its; CE ___.CH3' 0: C H 2. L 3 ML X 23.91} ‘x 311‘ ..... a 4L “4" :~ i" OH OCH3 l ML '2 41‘ 1} Vim“ ., . . a ’ '2 I ( 7- ML 9 ‘ ‘ me, Is; Lu’ ‘ a!) _ A ML {x .L._'=_.._IZC;_,‘JJ K ,iLJ—L x L/L‘u'f i: C C M“ g l M L 'lQ} I yMJC Ll? [1,}CL ,- l f g“ i .f .1» (, ‘3 Q " ‘ k “it‘ll i‘) — CYI it ’hcx‘u’t (Lie. rmW. _ _ I i i . - ‘ X ' , ,a—J—MH.‘ -~ 1 1-" i . k ”N I r‘; ix :6» ,- (,iiL'Ll 7‘ I’KUI’C J, (I. {d’ I; /‘\1A'{gl ~.—......_, m, , r, __ ’ j 5. List 2 ways to raise the boiling point of water?(6 pts). Infili‘c,‘ lame-hurl” ”ii i“, gdglciL’c‘ (0‘9 w i? i); .J.“ C I .; “BL rtu‘ % ’.,'_ SS“ _, g C Q Hw is :7: (gjx A": 6. What is the most effective way to dry 21 solid substance? (4 pts) W” . M ("gig V 'V" )‘L'i’o’l &’ '."" ‘r, i ’ ii i u Len—t \ L ( L( Vle/LL.1> 'lgr- ll»; 3 .i i. .i i ii; 5‘ ,_ $9 C): C L t. if‘ 7. List 3 purification techniques other than distillation? (15 pts) ww—fi-W--M.—MN it ”MON“ .4 _‘ t \ \. h: " Mr "c h t\\’ \... t j W l I . .1 ,m 1 7 Q h, ”[7“. "-‘W /K‘Q ( {7 g ’2, l/I/ (‘c‘llc-M/K j) l: x'f‘. ~. ( fl ( '7 if (it: i)li.'1r\q+/u.\ 8. What happens to the boiling point if you? (10 pts) 1. Decreased the pressure? Lemon's 1L“; b p 2. Added a mechanical impurity? y i an” at , ,i L, M, c “5le 20 10 0 80 w :50 cc: '7» EC ”in L ‘C 11" [PrecentComposition (‘70) Use the graph to the to answer the following questions. Mixture (AB), “A” being the lower and “B” the higher boiling point components were distilled. (26pm) 3‘5? ~ . *3 l. A distilland 0f 80% “A” would have what boiling point? '0 (a -—- ’L g) l” L 2. The distillate of this distilland would be comprised of what % .. composition? ~ 11¢) «A? K, 13, 3. What temperature would this distillate be collected? V“ ’0 11:) i» it l '24; - (31%”L 4. If the distillate was coming over at 125 degrees Celcius, What is its composition? v, I“ 3. ‘ , 1 2);“) {c b 3L7 i“ 5. If the distillate was coming over at 125 degrees Celcius, What is the composition of the distilland? W ‘ ‘ v” n "J l E; / g r 32 A A .. , 1 l in, Y. b ‘ ' ‘55" 10. Use the Nomograh to answer the questions. Part A. A hydrocarbon has a boiling point of 450 degrees Celsius, what would its boiling point be at a pressure of 20 mm Hg? Part B. If a hydrocarbon containing 30 carbons was going to be distilled over and it had a boiling point of 500 degrees Celsius at what pressure would it need to be distilled over at a temperature of 200 degrees Celsius? (6 pts.) ° C 400 -—_ I: °c E 700‘: r: soc—i aoo—g :: 500—: E 400-? 200:; E 3 300 ‘z zoo—i 100-3: 100—: 2; Boiling Hydrocarbons Pressure .3 Point at E ‘60 mm Hg ()3 B0111“: P011" at reduced pressure Equation Page from Chapters 1—7 Pr = PA"XA YA = PA/Total Vapor Pressure Enrichment factor = (VA/VB) / (LA/LB) Number theoretical plates for standard separation = 1.53 / log (enrichment factor) Number theoretical plates for standard separation = 120/ T2-T1 Corrected Temp. 2 0.00015 (Tread —Tavg)N bp at reduced P = bp at 760 — [(273 + bp at 760)(76O — P)/10,000] log(760/P) = 5.46[(bp at 760/T) — 1] ...
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