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Unformatted text preview: Student ID # Q, Signature Lab TA’s name Lab Section- MIDTERM EXAM Chemistry 102, Winter 2008 .Please read the entire page of directions before you begin. Do not begin until you are instructed to do so by your TA. You will have 2 hours to complete this exam. YOU MUST FILL OUT THE BUBBLE PAGE NAME (last, first) and ID Number WITH BUBBLES YOU MUST FILL OUT THE FOLLOWING VERSION NUMBER CODE ON THE BUBBLE FORM BY FILLING IN THE APPROPRIATE BUBBLES THIS TEST IS VERSION 02 VERSION NUMBER ENTERED UNDER DAY BIRTHDATE DAY 02 At the completion of this exam, you will hand in this exam and the bubble sheet into separate piles, with bubbles page face down. Every student MUST turn in both a test and their bubble sheet. The periodic table is at the back of the exam. You may separate that page carefully once you have begun working. Choose the best answer for each question. R: 8.3145 Jmoi"1<:"1 , 0.08206 Latm mom-1 at : 2dsin6 Na: 6.022 x1023 molecuies/Inol 1 atm = 760 Torr (=760 mm Hg) 71.” 1‘ ii/lJJRT m£_ AH; i_i Asz—lemJ AszlemJ P, R I; 10 PS 2 XSPS" AS , :—R(nAlnxA +113 lan) P : Xpo m [X I 1‘) Given that the bond energy of a C=C is 611 kJ/ mol and the bond energy of a C—C is 347 kJ/ mol. What is the best estimate of the bond energy for a Cfl? 1200le 1 "‘ @800 kJ/mncii 3L3“) “' 105” c) 600 kJ/ mol d) 650 kJ/ mol N3“ N3 MW 06 W“ e) 1000 kJ/Inol 2.) Given the following two surfaces for a graduated cylinders, what would water’s meniscus look like? (Concave down is the meniscus for Hg in glass.) H30 mitewcdcsgw vol I So mean/cup ‘ H11) Rwlrcwwis mares l. a) Water’s meniscus is always concave down WI iM'F W SWQ‘IE ‘ b) Water’s meniscus is always concave up 50 £5an dew \A c) Water’s meniscus is concave down in cylinder I and concave up in cylinder II @Water’s meniscus is concave up in cylinder I and concave down in cylinder II e) Water’s meniscus is flat 3.) What is the formal charge on the center iodine in {13]‘? :j‘: a) —2 0 ' -1 CD @0 $9" FCs‘J—Ji‘ib‘Lfi’ d) +1 e) +2 ._ 1-. =- gram)- 0 = -—\ .a 4.) What is the order of expected freezing points (greatest to least) for the following aqueous solutions? a) Tfi)(HCI) > Tfp(sugar) > Tfp(CH3COOH) b) Tflsugar) > raster) > Tfp(cu3c00H) TQKHCI) > Tfp(CH3COOH) > Tfp(sugar) ; )ifplflflsggolfli TMHCU ?.4Irp(sssar) (F) Tfp(sugar) >“ffp(cfigt:oofij '> T¢(HC1/)/‘ X 5.) Which of the following has the largest bond angle? .j;\ ,1: . . ‘ Elan-YA}: (bah/n . if " (9,1 -- 'A ,2?“ e14 wkmvmm ms 51/ \f: 1% .. 13) A313 ‘l’UWLNATd 4.1ms— - ,. '__: I: :1) $612 meMa-Q 4‘. tom: “.l'. éé. ti: '4'- )NH3 1—0? Mal 4 ".."' .. fl e) All the bond angles grtggt'iivalent ‘0‘, ' S" H/ 3:" H 6.) What is the hybridization of a AXlgEg? E a) SP x I x b) sz ism-(a \A{\ 0) sp3 ' )L/ t X (1 spsd . , aw 5 7.) Ice, 20.0g, was happily sitting at 0 °C. Then an unknown amount of heat, increased the temperature to 25 0C. What amount of heat was added to the system? M 100’ - .77 k] ”sf-V“ A“ b) 2.10 k] SW5: 45+“ _ ’5 +3 c) 122kJ * a 1. d) 31.6kJ __ '5 ’-' labile?” e) 6.79 k} g, v6%fi‘h( (9m \4- MIA 8.) A 102 chemistry student drew the following Lewis Dot structures for C3N3H7. Which is the best? ONHZ | 0 D D _0 Hac—m—Cm—CZN: 9.) Which of the following has the longest bond length? “ \OWbOVh‘ OVA»? s4 H co co as" of“ a) co- He." -—- 0“" -—‘ -- ,. ._ b) CO 10:: “:01" 4‘42"- ”if '__ .. __ c) CO+ __ .— 1T 41 fl; 0e se :5“ 4’31 43” en my e) Not enough information 312, 4" 4y. 41': 30': E—E Lag]; file-=3 '44-'35 {9,2, 10.) Why do you put salt on the roads%fier a snog'storm 7" 7" " ,7- ‘f ’- L a) Tire traction b) The salt absorbs the water 0) Energy is released upon its ionization to melt the snow d Salt forbids snow 3 existence 9 alt depresses snow 5; freezing Upoint 11.) What do you know to be true from the following graph? Norma} Boiling Point Xv»? Xv A Mole Fraction .0138 3 fi)’ Mole flaotion of the vapor phase equals mole fraction of liquid phase )9)" Mole fraction of B in the vapor phase is less than in the liquid phase X K 4.. Xi - For the mole fraction of A to equal B, B has to be held at a higher tempera e a? 0 0 839A <PB¢~'t 'PT 60 V? A fi’PA 2 Pa in): be, p. \I'PE 12.) The portion of a heating curve where the slope equals zero ould ive you information about what physical quantity? @Hfus b) Cp(solid) c) Cp(iiquid) d) Cp(vapor) e) Not enough information given 13;) Determine the molecular weight of protein Y, given that a solution of 3.50 mg of protein Y in 5.00 rri of water had an osmotic pressure of 1.54 tori at 25.? OC? 8 1" a) 2.78 x 103 g/mol T‘i MET J "l . b) 8.56 x 105 g/mol c mo I'Y4-E" ,. A ‘30798g; 10g g/mol %0T9w' M -— U3 M koogzouafi‘ L) W. ._.—-"‘"" 3.45 x 103 g/mol VIM K .— auca 2-1 “IL. | . 14.) Pick the true statement about the vapor composition of a solution that is 75% A and 25% B given that the minimum azeotrope occurs at a liquid composition of 75%A d2'% B. an 3 La when. (‘13? \i‘buHr We a) The vapor composition is greater than 75% A W CD/nFD‘b‘JTl 0‘” b) The vapor composition is less than 75% A c) The vapor composition cannot be determined without a vapor pressure curve @116 vapor composition is 75% A e) The vapor composition is 25% A l5.) What is the absolute value of the difference between the AH when calculated with heats of formation versus bond energies for the following gas phase reaction? NH2 l s PIC/I \CH HC/ \CH 1 H + “2 --~——-+ I ll + HO OH HO OH NHS \C/ \C/ H H Al-l: = ewes m—ZbomlsQWN-eo '__Sl- are «um-18219» (scam) a) 71237915533 *5 6-H e (0443 *(a—m - lc- HW-‘CN'l' b) 447.63 kJ/mol 5 30$? 43(0- 414— 38‘? c) 377.37 kJ/mol @1163 kJ/moi c “(92 KS e) OkJ/mol 415$ _._ 45—03:}, L442); |\ in?) 16.) What is the definition of lattice energy? a) The energy required to dissolve a lattice in water b) The energy given off by combining free, gas phase ions into a lattice @flie energy required to break a lattice into its free, gas phase ions (1) The energy required to break the lattice in half e) The energy released when melting a lattice - if “it: WW —-I 2x10 cw. 17.) You have an unknown solid X that is composed of a Single atom. X—ray diffraction measurements inform you that solid X has an atomic radius of 142 pm and packs in a face centered cubic unit cell. You add 20.0 g of solid X into a graduated CW4; \‘z 1 31.7951". containing 50.000 mL of water and the liquid level increases to 51.735 mL. What atom -_ is solid X composed of? (Hint: Do not round until final value is obtained) L’HSQM a) He V0\W . _ 4 r: a E b) Tb 6&9. —IO r c) Cu :5: Malawi: woe-6 2- “ Sb ea 2. 6:4.OZXID"3 om . \10\ .- e. 2: (9.41410 OM 1-5 20 (0.44110 “3-5:.1443 .12. g, 91%.!"3 ad a 405‘” to - 4'- , L1$SOW 4 me” 18.) Which of the followrng structures would you expect to have resonance? :9' :3: 5... H2. .44 —» CA a) CH3CN H—f—- LEN: ado) ‘ a b) [0131— H H H , ., a: calm) c) ongcnzcozn . ‘ 3 Na 10-. u. d) can4 9*?” f“ \35‘ 3 ' ' “Kc =51,“ @O) @NOJ ’* H " a “’ -- :0] *9 . ¢H\o . . a. , 19.) What is the normal boiling point of pentane'fw K—y I -—=: q— 3 am . , Temperature (0C) Pressure( u Hg) 25 :2 8.2 512.54 35 r- so = .1- 73 l'" (1%?) ’ An Hi. "ti-“.3 a) 14.9:C ' 612:?! Pu . ,L... ._ W63 C in (252.40% 8.84'5ivmv. (5057’ 945'1‘) c) 470°C d) 62.6%: ARuV= 2?%O‘S'.ta‘l'51m\ 919-“: \ [W .. W ,L. _. J— “ W0 MM " 3-514 "Imah T2- 2452' 20.) One day in lab Lisa made a SrS ionic cry al W = 119.69). A er collecting X-ray T __ 30"] .2" data, she learned it had an edge length of 342.95 pm and packed in a CsCl-like unit cell. 7' _ ' ' What is the density of this solid i crystalline form? C a __ m - <- - \_Cs + \ Om 2:42-01 "- mm ‘2 g . " ' %6 tin +aM b) 19.38 g/ cm3 s W's c) 9.69 g/ cm3 =%‘ilfl '3‘ '2 cm % 3 :, .. d) 0.208 g/ cm V0‘VWN. 'C = Laqqu-x i0 WM? g 4 ‘ DMX10’23V‘E e) 0.0520 g/ cm3 i AW.- =......_.W55 : ‘l‘i-Wflimut‘fi 'm .5 ~— M (9.02.1510 mg“) 4-034Xl0'7'5 M3 1: Li q staining 4.93 g/ cm3 21.) The following phase diagram is for UF6. Which of the following correctly identifies the labeled phase transitions? - 1000-. It at; ‘ : . .-I H”; :II :2 . E- m: _- {L :11" a... - 3 m in WI -. a... I} 25 "50' F52 NJ!) 125 155 115 21:30 225 __25{} .2335 _ Temperature {F} _ m ’= =' Dfi-Osition _ {a u Gonéeesafiefi mm 22.) Which has the highest precision for measuring molecular weight? t a) Melting point 1)) Boiling point c Freezing point smotic pressure e) Depends on the molecule 23.) What is the electron pair geometry of a see-saw molecule? ' a) trigonal planar b) tetrathedral /y\ 1gona1 b1pyram1dal , d) octahedral O \\X %N ug‘ e) square planar FL 24.) How many p-orbitals combine to form the deloealized molecular orbital(s) in the following molecule? Gimme; \C / 0 m :domimhmfl I :2 lODY’pfi'kflS a) 8 _ _ 10 ‘32 36 d) 14 e) 16 . 25.) How are molecular geometry and hybrid orbitals related? (Hint: Find counter examples.) 10 26.) Order the following three molecules from highest expected boiling point to lowest. N a) pra) > pral) > pran) > may) I has were e W Cfl‘: 330 b r (IV) > r (I) > T (n) >T (111) a. dial) > TbiiIII) > Rpm Sign 3” TEL ‘0 7 T” at) d) pran) > rbpat) > pra) > prCIV) (I) is \mmnr J50 H- We m (2 W e) prafl) > prUI) > praV) > prU) ‘HMM (IE) 69 Tb LIL 57T5Lm) 27.) You have a closed mayo jar with two test tubes. Test tube A IS filled with 25% benzene and 75% water (by volume) and test tube B 15 filled with 50% benzene and 50% water (by volume). Assuming ideal behavior, what would you expect to see at equilibrium? at“ VNPO r." %ab\e V ai Mole fraction of water in test tube A is greater than test tube“ 15 @ YWH‘W )‘ dole fraction of water in both test tubes is equivalent c) Mole fraction of water in test tube A IS less than test tube B d) Mole fraction of water in test tube A 15 1 ‘79va '" ova/E e) Mole fraction of water in test tube A is 0 o 9 a Xi’a‘fbj XHLOEMO -: Km???» Ab” 11 28.) Which of the following valid Lewis structures is NOT a valid resonance structure for [shelf-'2 29.) Which of the following is diamagnetic? s “e“ a BN‘ fife" ”flag-Fag @BN 83’ . fl:- 0" c) BN+ 4g” __’_ ..... ‘ d) BN2+G£ ._... r m B) All answers are paramagnetic __ 0.. am“ a»! 15W as“ C479 "f- "“ __.... ____:_._- A»: 'll {ll—3‘ l 4!- 4¥ 4y, 3;. 0.) in the following unlabeled molecular orbital diagram, which statement most accurately describes the orbitals in the box? a-lowfic. or Wk MD’s Del-Misc or b31136 a) The atomic orbitals that exist in the molecule b) The atomic orbitals that exist on one atom in the molecule The molecular orbitals that exist in the molecule The molecular orbitals that exist on one atom in the molecule @T he atomic orbitals that exist before the molecule is formed Mom were ma amt-m We. 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