Exam 1 key_B - Cisswos “' Exam 1 Version E [19 February...

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Unformatted text preview: Cisswos “' Exam 1 Version E [19 February 213% Multiple Choice Section: ‘ 1. Which of the following compounds should have the highest melting point? 2. The heat capacity of liquid water is 4.13 Jig-T o e heat of WE: J“... vaporization is 40.? kJImoI. How monv ' ' of heat must be gm 1:: ' provided to convert 1.00 g of liquid water at EIT°C into 1.00 g of steam “1 100°” 6) his ice Q s (5mg,ij i5. Slit; x351): 1'58 3 v 7+ v.1 » 22.? k: :- xi-Ffir‘ltu vzo H : Lib E 1:) 4D 3 K] O EbJ—"rifl “Imam-*1 the - @3100 J I is d}40.BJ view:- area it?) Dir 2.4a: a] 2-2 M 3. The vapor pressure of pure water at 26 ”C is 25.21 torr. What is the vapor pressure of a solution that contains 16.5 g of glucose {CEHHDQ dissolved in 83 g of water? a} 0.49torr 9' L. x {9“ b) 25.4 torr '* l h" a E if c} 16.8torr _ m “it” _14.1torr )éa be“th '1‘" ' fiafl e) 4.? torr cacti-Lint) .aa (ALL-11+ m1 hair OgiS‘EW-e i c: {3.5‘1250 'i. {)5 ._._ @fi‘iflfllfifzi) .2 2%.? Jim“ C I 36Wfifi ExMfl] Versien B {19 February.r 2W6 4. 4. Use The graph of vapor- pressure To deTer-mine The normal boiling peinT __——-—-—-" efflz. L211 W a. Vapor Pressure- Tntm] "HI- T6 TM an 32 3d 36 5-! 9D 92 94 TEMP TH] e92 K @e K c 38 K d) 84 K e} 02 deesnr‘r boil because ET is always a gas. 5. Which one of The T’s-“owing subsTances wili have beTh disPersien h C isswos Exam 1 Version B [)9 February 21396 ‘ I md-Joi fluwfiflw 6. The most significant force between“ particles in a dilute aqueous MgCl2 solution is WWW l“ 'S'G‘Mhsn (trail d..'L.r’~s.soln ) C harge~dipole interaction dispersion forces fight} haw d) hydrogen bonding ““m "—1’ Eiffgh T lit-2.0 it 1”“ ' 3.;ch k}? ?. The osmotic pressure of a {1.82 M HC] solution is 35. atm t 18 “C. Calculate the uan't Hoff factor for HCI at this conce tion. a)1?.2 ’Ti-r: LMRT 12 H;\ - or . b ___ LCU‘SZ‘)LDEQ&Q_H LcJ'I-"fi E 1.83 cm can... 1. cl . - . ~ 32% L___|L_LE_)5 MWPWS. L42.- 3. Which of the following compoumls should be soluble in CCh? if)! WIFE? oat—Near ion-“L We hum? b)-Hze— all“ cyHeGH— W" “L r Jr 3H1S = Womb“ Hush h-sl’i‘l‘j id‘s-I‘m m N None of These a. mum HS 1.9”} sum Smithy" 9. De amine the rate constant for a first ordEP reaction that has a alt-life 26.? miss—rt a} I'l'r'lil'l'lfl lll'r'"i. 11h '- b)19.3min1 k :1 .W c) 18.5 min'1 st : Jiflhnrl Mm *- ~13 d] 9.25 l'l"l'll'I‘1 t) 'WE‘D e 01326 min'1 ' C136W06 Em i ‘v'ersion B U9 February zoos it}. If the rate of the reaction PClsé PCI3 + Cl; is increased by a factor of four when the PCI5 concentration doubles, the rate iaw for this reaction must be a first order with respect to PCis 345% f j my second order with respect to PCls aw Ed 5 : ,, c} fourth order with respect to PCI5 “‘1 2‘ d} dependent on the PCI3 and Cl; concentrations 11. Which of the following properties indicates the presence of strong intermoleculor forces in o iiquid? ;1| F .I. Ilbfimgmw low vapor“ pressure .QW W I oWboiiing—poim. ‘1‘“ W dare—iow-crificoi-tempeveeeee e) None of the obove. 12. A catalvst is effective because a] itvsrsppitesenergvto-the—reattant‘nmfetules, allowing more of them to achieve energies in excess of the activation energy for the reaction b) .' ' molecules in the reaction mixture t lowers the activation energv of the reaction by providing a lower energv mechanism or pathway d) ‘ ‘ ‘ ions between molecules 13. The number of oforns in o body-centered cubic unit celi i5 (1)1 . - @2 i no Lew as A, d}4 e318 EWWfi i: li‘M IL... C l 36W06 Exam ] 1ia'eirsicin E 09 February 20015 I4,Which of The fallawing is‘naT True wiTh regard Ta wafer? a) WaTer has a high head capaciTy, 1f" 1:} WaTer has an unusnally high bailing painTE”, c) WaTer can form hydrogen hands. J Gd} ICe is mere dense Than Eiquid waTer. e} WaTer is a polar malecule, ff 15.Ca|cu|aTe The percenT by mass of paTassium niTraTe in a saIuTian made from 45.0 g KN03 and 295 mL of waTer. The densiT'y af waTer is 0.99? me. a . . g m‘lesM—hfl mi“ :ZhTffieo a} 1.51%; ML “L0 £2015? e [ UH; O @33 $3 I - 3 - ' SJ 2 I“ ' if cause “:1, ix” “30 ’5 '3 C 2'1»? "4‘ Lisa) e) Nane af These 16. 1|iianadiarri crysTailizes in a hadg-cenTered cubic IaTTice, and The iengTh of The edge af a uniT celi is 305 pm. haT is The cziensiTig.»r of W #23 a La N": 3062c ib“‘“e--:)3: 2.5.1:}: HQ .96 gfcrn‘q' 2 Mi we I. x.» b) 2.98 gfi‘ern3 I ’ ll 1 ‘eI-lx “SEED-v3 Lfllwfinww' I. 1W .5) 5 9.5 X 10—30 gitma MM . a) 11.9 gram3 e) 2.93 x 1045 gfcma ear-Te) 31m} 1?. An increase in The TemperaTure af The reacTanTs causes an increase in The raTe of reacTian. The besT expianaTian far This behavior is ThaT as The TemperaTure increases, A. ihe-eoneenTraTion-of—Peeciezusjflgmses. _'—'—-u. BI i . . I [ C. iThe cailisian frequency increases. 0. The fracTian af callisians wiTh TaTaI kineTic energy 3 Eu increases. 1; WWWEE CIEEWUE Exam ] Version E 139 Ftrizlruarg.f EDGE- 18. Far the reaction 4 NH3[g} + 5 D; (g) "3* 4 Nfllg) + 6 HleQ), *aWHflXat = 215 x 10'3 Ws at a particular time. 1lr'il'hat is the value of —a[02]fat at the same instant? a) 2-1x10-3MIS MIL}! jiwnhc’iflz- bl 1.3x 10'2ws ] C 5.2 x 1'3!2 MKS buckle-3,01 .. #gfirg __'§ 51mg; cl 3.3):10'3Ms F'" r If, air—f . ‘ “l H e} 2.6 x 10‘3 His a+ Li. was as as 19. Using the fellpwing phase diagram fpr substance Q, predict what happens when pressure is applied to the substance at point A. E 1.! E. a] 5 3 H U! I” I— CL [I 11313 2131] 3GB 40]] EEEEI fiflfl Tarn pera’ture tam; Substance Q C3 freezes S #2} {L melts c) vaporizes cl} cpndenses e} sublimes C i36Wflo Exam 1 Version E DE} Februaryr EDGE- 20.For what order reaction does the haif-iife get ionger as the initial concentration increases? 1 a [:1 r be 312 @EroTh order 4: in- # 9%; {4 I1 CA ,. B. first order he; is 0%?“ J WM 0.9 [bi-1:: _ F- .1. C. second order IL!!!- 2 :3 I I bl”; {PL CHIC: I I r E). none of them because alt-iife is-aiwaars-independent of the initiai concentration gas in i535 DFM‘ 21. The soiubiiity of gases in water usually decreases with a} increasing pressure. @increasing temperature. c decreasing temperature 22. Which of the - for thefoilowi a - a) Rate a 1<[A1 '5, a) Rate = k[C][D] 1‘ Z?“_ c) Rate = I<[A][B]2 @Rete = kEA][B] e) not enough information L': 1i 23.When 12.1 g of the Sugar sucrose {a nonelectrolyte) are dissolved in exactly,r 300 g of water, the solution has a freezing point of -0.082°C. What is the molar mass of sucrose? K1: of water is 1.3mm. (1)4259 [5‘11 .3 'L kg? m- biggéag 5-051: {LL-“3i: >m m 3"» c 1? g H __ a}zsog me: o, Quid: nit njofimujieu: {3.0139525 @439 1 L5) .31 "x --= 23%;) C136Wfl6 Exam 1 Version B G? Februaryr zoos 4. 24_Which one of The following changes would alTer The raTe consTonT (k) for The reacTion 2A + B —:- producTs? A. increasing The concenTraTion of A (shit) b. 'T I B, increasing The concenTraTion of B k 633 increasing The TemperaTure D. measuring k again afTer The reacTion has run for a while 25.C0nsicler a soluTion made from a nonvolaTile soluTe and a volaTile solvenT. Which sToTemenT is True? A. The vapor pressure of The soluTic-n is olways-greoTer-Than The vapor pressure of The pure solvenT. The boiling poinT of The soluTion is always greaTer Than The boiling poinT of The pure solvenT. C. The freezing poinT of The soluTion is always-grea'l'er Than The freezing poinT of The pure solvenT, 26_Which one of The following crvsTallizes in a rneTaIIic laTTice? a} c “- va'l' Weev— Tunic 69 d} NoMnm mania e) LiClD4 wav- KL» 2T.Which of The following gives The moiariTv of a 1?.0‘353 by mass soluTion of sodium aceTaTe, CchDONa {molar mass = 82.0 gfmol) in waTer'? The densiTv of The soluTion is 1.09 gme. r E: I r all ital-p.115,” 114’.) ‘L-cfi '1 1"”th I L- " lm.D¢EIEG‘1:: Trev“: ELENA ’2.me n. 2.26 x1043 a e. DEWM CIEEWGG Exam 1 Varsion B D? Fcbmwjr 2W6 28.For the reaction X + ‘9' —+ Z, the reaction rote is found to depend only upon the concentration of X. A plot of UK verses time gives o 5W“— 5E timefs} What is the rote Fow for this reaction? :1) rate = k [X] @ote = k We c) rote: Mxm] s) rote : k [mam (31360306 Exam 1 li."c:i*sic+n i3 [)9 ircrlsrusijir 2006 Free form [10 points} Border caps in Detroit stop a car coming over from Windsor. In the car, they find a small bag of white powder. Cops suspect The powder- is heroin (C21H23N05, 3159.42 gfmol}. A small sample is sent to a forensics lab for analysis. A scientist in the lab dissolves 0.0100 g of the substance in 2.00 g of benzene. The solution freezes at 5.43“ , Can the scientist conclude the substance is heroin or not? Explain. (A ‘fES or NO answer will receive no credit even if it is correct. You must justify your answer |Iiiiith a mathematical solution.) The normal freezing point of benzene is 550°C and K; for benzene is 5.12°Ci’m) I. 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This note was uploaded on 04/11/2008 for the course CHEM 136 taught by Professor Smith during the Winter '08 term at University of Michigan.

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Exam 1 key_B - Cisswos “' Exam 1 Version E [19 February...

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