122ch11b_002

122ch11b_002 - @ 43315 gm mcvg/ hirg'édfi? V ' wfx /5...

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Unformatted text preview: @ 43315 gm mcvg/ hirg'édfi? V ' wfx /5 7f§ % .. f j .28 ' ."Maza 0?:— _;.,. : 4W, _ . _ “a w _ 79¢ f H“ W ‘ M #5. ,g 1 366 E E 7% fan: #41??? 7‘0 797: . 21%;: was gfiéwg ‘3 mmng _ _, 4.? = ” ” A} '4 = a2. Log/K —'— 5:0,: ATM A4, —= 3?. 5'6 kw I O [I "a I ' H 537%,: fiwxfw—mflzi t (63??me MM 3 __ __ +£75€¢X 'K " W.- — 4» I ‘" 123%; f 925/ + {zaW'méj ' (1's; {3 ma) 735.0 "7?;ch /0"7’5Zg'- J... ..... can? agave/7L 7‘3 Ma’Jip/eaz) -. mgi —? /0:/é’_/f, :51- JT 495;»: 10’ T“; _"W_:::m “1—.-.” M! f. T — knwhflfifi. é fiézmaé" _L'.'"'..__-_____'_7 44m e - . a J [_ .zr é-firmrgra ________ A /"~ 1% _ - éd. 5: .. ______.___ _ % AeJ/fl‘ 57424 if , [wfiZK __.. -AMW £50“ 3. flffi»€__w____.. _._/c‘. 2. Q ' __ _ flwm; A; 2% / 5Mng Li: 4422. ‘ {702%}? : : ' fiéflguwflgggfigg_fl駧fifl),iéfi7&lw.. M gag; '.:1/,i¢)4>77{2_c g_ F____§ __ @efim’gfimwffm; ff“. ’3. _ _ _ _ _. 7L7 ...._____.__ :____ ...~Q2flL%WT—Effl/;M2 ,‘.z;s__r__22@%_‘dflm ;W ngfié/gééfiiéflm 722“: # """""" __j ___.:':.' efiéga‘i gagengbécé .4 Aux_'fié—wgéir__._.._._:::: .. ____ (1%) Vapor pressure would decrease with increasing intermolecular attractive forces ___________ "H_ because fewer molegtgdes would have sufficient kineticenergy to overcome the _ ____ v attractive forces and escape to the vapor phase. fflF MC. M}? 036' _____ _____ Vapor presSure increases with increasing temperature because avera e kine 'c “We- _ % reacan - - 4.. re are mrg ». w- energres of molecules increase ( we,” ,1? Fur mar/ea. £9 gs 4/22 p3 Q;mak_4[¢tar_m gauges/4% a9%¢ _ [ax/[gaze {Wager-fair} Max—'9': _ "Mop/W? faith; '- _ ___/A_M_(a) ‘ The less volatile compound. AsCi3. has the stronger intermolecular forces. in the _ _ l more volatile one, PCIS. more molecules have sufficient kinetic energy to overcome _ intermolecular attractive forces and escape to the gas phase. Since both compounds __ have the same distribution of kinetic energies at 25°C, the attractive forces must be —"__— stronger and harder to overcome in AsCia. This makes sense, because AsCl3 is '__ w‘ heavier and has stronger dispersion forces than PCI3. ASCI3 is also slightly more "WWW — ‘_— polar, but dispersion forces-account for most of the volatility difference between these "—— _#_ two compounds. {pjgagrél‘h farce; 15 firm/{gr 249mm :99)» 1mm firm) —__ —' fl . . . weaker IAF) —" __.__,_(b) PCI3, the more volatile compound has the higher vapor pressure. (___> A A” VP "m "mm/“(0) ASCI3; the less volatile compound requires a greater increase in temperature (kinetic fl" "" energy) to promote enough molecules to the gas phase so that vapor Pressure is H—“ w ' equal to atmospheric pressure. _ *' 'ower . , if $- __ (tin, < CHBra < CHzBrz < ‘CHzclz < CHscl < CH4 _ ,____. I- The weaker the intermolecular forces, the higher the vapor pressure, the more volatile the ' cempound. The order of increasing volatility is the order of decreasing strength of F intermolecular forces. By analogy to the boiling points of HCI and HBr (Section 11.2), the fi """" " " ti'end will be dominated by dispersion forces, even though four of the molecules (CHBr3, CHzBré. Cchlz-and CHacl) are polar. Thus, the order of increasing volatility is the order of ‘—"“—" ___—m4. decreasing molar mass and decreasing strength of dispersion forcesn. .Pi). The water in the two pans is at the same temperature, the boiling point of water'at the atmospheric pressure of the room. During a phase change, the temperature of a syStem is __ IIIII ___ _____________ m constant All energy gained from the surroundings is used to accomplish the transition. in this case to vaporize the liquid water. The pan of water that is boiling vigorously isgaining more ‘ energy and the liquid is being-vaporized more quickly than in the other pan, but the temperature of the phase-change is the same. ' H_________ The water vapor wculd defer?!- to form a solid at ’a pressure of around 4 torr. At ___m higher pressure, perhaps 5 atm or so, the solid would melt to form liquid water. This ____ _~ occurs because the rushing Egint of ice. which is 0°C at 1 atm,‘ decreases‘with increasing. grew. _ _. _ ' . 4232‘ -. n ' K fir. _ ._ ‘ .. d .. ._“_46rge&;_ . . L_é_fca~__7_&£ _L___ ______,_ _.[__‘ fizz..- aéz. “ a 5:9 as? -. AMEQJMJQMQL _# l i _ __.—._._._._....w... {m 4 Pres-Sure, atm (not to scale) Q5315) M" "Md/QT W ' .-m“w_'__"wi;._:::i 02(s) lsdenser than 02(l) because the solid-liquid line on the phase-diag’rahtmis I l 3 "normal! That is, as pressure increases, the melting twine Increases. [Note that the solid-liquid line for O2 is nearly vertical, indicating a small difference in the ————-I “a densities Of 02(5) and 02(01- «flawed 719 % I: Mun—"— 02(s) will melt when heated at a pressure of 1 atm. since this is a much greater ———?--— ———~# pressure than the pressure at the triple point. ' [A ES'E The unit cell is the building block of the crystal lattice. When repeated in three dimensions, __ u it produces the crystalline solid. It is a parallelepiped with characteristic distances and angles. * Unit cells can be primitive (lattice points only at the corners of the parallelepipedj or centered ___ (lattice points at the corners and at the middle of faces or the middle of the parallelepiped). {1 __ xii! I ,2 Mr / 9.41! A -' r r 75 . /" l J 2" A ./_II‘ I M . "'LT)/:Ei1_£2m}ZEZEZfZE@/fi " seer" ' 244"; _ " ' " [221: imam 7% we 1:" _ _- cmm __ _ _____.___.X_mamjfiflf’féami .. m.-. .f . . .. _ .... __. I ____ __ ._ _ da- _ 75?} g Mafia/M; xz"'“zgggmm [2935 m a: i— _ 25. 2 “"27 ML figm) ‘. ____~_.___j;A€ m i713 5 g/ng_f£:t_ ____ __.fi?4€m) m_ f u 79W}? JEQAJ,“...-/§ae77éi E) .__n____" .221 162 459344 (,1 4m (49. i/OZ v r: My; /‘ - r . ' I I m ¥ _ a 8 Q 297. J one / __ f“ 4F" 4)" 9L a / $7 [3’ ‘55: . ’1‘ I I 14.1 _—__*..__'m ’C at c ' . , ,___, 7—H“: aims? Mm. 1%.. 33;; 5,2- Egg-33,144 _ _ fianza‘WZu’vM x “1' —WW- m wa .7. 4.33;” , 4;" \/:: 3 5-5. / 476 5/6/ka ‘ ' = = #445 x A? "944“ 1/: (6!waan ...
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This note was uploaded on 07/17/2008 for the course CHEM 122 taught by Professor Zellmer during the Summer '07 term at Ohio State.

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122ch11b_002 - @ 43315 gm mcvg/ hirg'édfi? V ' wfx /5...

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