J09chem1063J09exam2key - Chem 1063 Exam 2 J-Term 2009 I...

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Unformatted text preview: Chem 1063. Exam 2. J-Term 2009 I Name 4" /¢ Show all work for credit! Remember sig figs! Useful information: q: stT, s: 4.17J/g-°C for water, R = 0.0821 L-atm/molK, 8.314 J] 2 (p... 911?)“; _ Rb) = ”RT u = [315" ratel = {Mn/2 moi-K, Pvznm', V , MW , rareZ MW] (1)(6 points)(a) How much energy would be required to heat 1000 kg of iron from 20 °C to its Felting oint (1540 °C)? For iron, 5:0.449 Jlg°C. “f fiWr’Q(/¢vw 3105,20? ) : a: lay/W : or; W’U l (b) What is the DHrn for the combustion oLcoal- (reaction below)? arr/=6" 5122'; U _ r 0(5) + 02(9) ----> COzigl ’W i 3 i 25“ ‘ 44“ Moll/m4) 5/3 735/4 gm #372. W (c) How much coal (in kg) would be required to heat the iron in part a? 5, 521/094] 4 31359” /, 721/;me ( M34 (”6'2 .'7 33 _ _ . / ”V WW2” 2.0% go" L. (2) List all intermolecular forces for the following molecules Show all work. (a) SlH2F2 H: {S}. H ”:6?! L3“ 4;; if; I i a (bus ’15 I ”t r]; drift" “‘ , I i__)! ” 0 (c) NH20H (N and O are bonded) QM $03” ll/ Op M I s _ A! '- Jygw [gm ,, , , , ,1 ’1 d? (mA/IZI’m/v énfl/ Jq M j 3 ”4/; . . (“Mr Kfljfc/Q.m£re2r 5‘7 ' “CV QWA/{9Q9 gr (3)Explaln (not just list) the type of solid being described The possibilities are; ionic f solid, network covalent solid, metallic solid, polar molecular solid, and nonpolar molecu— lar solid. (at) The solid has a high mp, does not conduct electricity, and does not dissolve. Alf% W .- (aw/r14 [LC/1,1! “A“; W. Willy '/: (Tug/k2 A”, i;- Wflffl‘fwjzdflpéz l" ’ Gulf/46 fiLLWé/AC ézm/jlu’f/Jsj;/LQ '- E497! Lef‘é (“a/“agar: (b) The solid dissolves in oil, does not conduct electricity, and has a low melting point. pftggdyigfig’v’t‘l :11 - Gin/7 Mfl’fl'r 5 0M Lflf Kai‘s?” rimming/email 4* bump '3’ CMjJYJEi/fi . (4)(6 points) Which of the following substances in each pair would have the higher melt- ing point and why. (3) CO2 [email protected] 6)4€/flé5}¢£:f{tq éa-ngfi 1 A (Eyép/ If? {/L '" thrh/ 41:51? ("5" a" 6’ “if (b) CH3F CHSOH ‘ C/jfi (if f /{é¢mg7 ,- Cid Feé’¢§fi%_ M157 /b:,..e--" f/V 54/“: I‘WSJ— (c) uartz r PCIs Masai web/é Era/Mi} 4W? WMA/ U #7 55 ”Zeb 5 , l‘ ”515131611 ’2’!” 52.24%} ~ (5)( 10 points) Which of the following substances would you expect to dissolve in water? Explain why. _ l“ )7 , @ 7&6" 1/7; A” é‘j’v’g“ Ain’t/”fr 4/3 ‘iiié'fis’l‘ci‘w .C‘/ (C) CHsCHgCH2CH3 113’. /% if IW/Z’x/c‘f’" fa I453) $14 4—4;”, 41,—; [£21 f‘ I . . I , Ii 1 . L” ’ I p , \ jléf‘filft (,‘W‘L— é¢v{S/dfl;§;’é)bfifz My? 50(3 a! , ii (8, Fe min/:2 cm is n {aw (6)(6 points) Answer the following questions using the phase diagram below. (a) What is the triple point of this compound? 43”?) a 52% (b) In what region is this compound a supercritical fluid? 61%“ (85)??an 434 9—33 dd (c) What phases are present at point G? ll'itvw-J a} j ‘32-? (d) Is the liquid or solid‘more dense for this compound? Slated! (e) If the compound is heated from conditions A to conditions B, what transition, if any, would occur? ’ ‘ ~ (f) If the pressure was increased from conditions F to conditions B, what transition, if any, wouid occur? 4 i , J , (Calif/r1. {4 A“ (y a) i) 150 atm. 0.50 am 45 ”C 233 °C ...
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