exam112.pdf - Chem 1721/1821 Exam 1 9:00 OR Dr Susan Bates 11:00 Name,< q TI=MRT psoln = Xsoiv 0 P 0 = msl'IT.Tb= Kb•m sul In(Pvapl = f.Hvap-h P vap2

exam112.pdf - Chem 1721/1821 Exam 1 9:00 OR Dr Susan Bates...

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Name TI=MRT Chem 1721/1821 Exam 1 Dr. Susan Bates February 14, 2013 ___ ,<.;:; _____ _ psoln = Xsoiv 0 P 0 sul\ !!.Tb= Kb•m In(Pvapl) = f!.Hvap(--h- _ -.]. ) P vap2 R f 2 l 1 9:00 OR 11:00 q = msl'IT I A II A Ill B IV B V B VI B VII B VIII I B II B Ill A IV A VA VI A VII A inert ~ ~ 1 H He 1 1.008 4.003 3 4 5 6 7 8 9 10 Li Be B c N 0 F Ne 6.941 9.012 10.81 12.01 14.01 16.00 1900 20.17 11 12 13 14 15 16 17 18 Na Mg Al Si p s Cl Ar 22.98 24.31 26.98 28.09 30.97 32.06 35.45 39.95 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti v Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 39.10 40.08 44.96 47.90 50.94 52.00 54.94 55.85 58.93 58.71 63.55 65.37 69.72 72.59 74.92 78.96 79.90 83.80 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Sr y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 85.46 87.62 88.91 91.22 92.91 95.94 98.91 101.0 102.9 106.4 107.8 112.4 114.8 118.6 121.8 127.6 126.9 131.3 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Cs Ba * La Hf Ta w Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 132.9 137.3 138.9 178.4 180.9 183.8 186.2 190.2 192.2 195.0 196.9 200.5 204.3 207.2 208.9 (210) (210) (222) 87 88 89 104 105 106 107 108 109 110 111 112 113 114 * Fr Ra Ac Rf Db Sg Bh Hs Mt (223) 226.0 (227) (261) (262) (263) (262) (265) (266) (269) (272) (277) ? (289) 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140.1 140.9 144.2 (147) 150.4 151.9 157.3 158.9 162.5 164.9 167.3 168.9 173.0 174.9 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa u Np Pu Am Cm Bk Cf Es Fm Md No Lr 232.0 (231) 238.0 (237) (242) (243) (247) (247) (251) (254) (253) (256) (254) (257)
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8 Chem 1721/1821: Exam 1 Part I: Short Answer (40 points). I. Consider the graph to the right that shows trends in the boiling points of hydrides. a. Explain why the boiling point of SiH 4 is greater than the boiling point of CH 4 . &~ o.rq_ ~"'f ~cu· : . h..~vt. o~ L\n\c:\o II\. ells pu-.s I CJ""- i1> r l '.s . LDP'J 1 )0 10(1 50 -100 1-F ". ::: j----1-------=- . -- - b. Explain why the boiling point of NH 3 is greater than the bp of PH 3 . 4 2. Consider the phase diagram shown to the right to answer the following questions. a. For this substance, is the density of the solid phase less than, greater than, or equal to the density of the liquid phase? le..ss +kt'IJ\- b. Put an X on the diagram at a T and P where only the gas phase of this substance exists. c. Estimate the pressure required for sublimation of this substance at 150 K. ...... 51)~-t»i - E - I'll - Q) ... :::i I/) I/) Q) ... a. 7.0 \ 5.0 " 3.0 1.0 0.75 x ... ·_,~- 0.25 0 0 100 300 500 Temperature (K) d. If this substance, initially at 300 Kand 3 .0 atm, is heated under increasing pressure until 500 Kand 5 .0 atm arc reached, what change of phase, if any, will occur? liquid-.. gas gas -.. solid solid -.. liquid liquid-.. supercritical fluid 3. Consider a laboratory experiment in which you measure how IA] changes as a function of time. If the relationship is defined by the equation given below, complete the table to identify how you would plot your experimental data. 1 [A] 1 k ---- [A]o tz ~)= --k(/~)+ ~) ~:::. ~)( -rb dependent variable independent variable slope y intercept j/[A] l/t.1- -~ 1 f[AJ 0 700 4. The normal boiling point of CHC1 3 is 6 l .2°C.
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