chem 102 old exam 2 (3)

chem 102 old exam 2 (3) - IVERSITY OF UN YLAND BA LT AR M...

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U M B C U N I V E R S I T Y O F M A R Y L A ND B A L T I M O R E C O U N T Y 1 9 6 6 UMBC Department of Chemistry and Biochemistry Principles of Chemistry II, Chem 102 http://ice9.chem.umbc.edu/Chem102 22 Oct 2004 Exam 2 Leave your exams closed until word is given to start. While waiting bubble in your name and social security number on the scantron sheet. This is version 0 of the exam . Mark column K of your computer scantron sheet accordingly. Keep your answers covered at all times except when making entries. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 (I) (II) (III) (IV) (V) (VI) (VII) (VIII) 1 2 H He 1 . 00794 4 . 0026 3 4 Atomic number 5 6 7 8 9 10 Li Be Symbol B C N O F Ne 6 . 941 9 . 0122 Atomic mass * 10 . 811 12 . 011 14 . 0067 15 . 9994 18 . 9984 20 . 1797 11 12 13 14 15 16 17 18 Na Mg Al Si P S Cl Ar 22 . 9898 24 . 3050 26 . 9815 28 . 0855 30 . 9738 32 . 066 35 . 4527 39 . 948 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 . 0983 40 . 078 44 . 9559 47 . 867 50 . 9415 51 . 9961 54 . 9380 55 . 845 58 . 9332 58 . 6934 63 . 546 65 . 39 69 . 723 72 . 61 74 . 9216 78 . 96 79 . 904 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 . 4678 87 . 62 88 . 9058 91 . 224 92 . 9064 95 . 94 (98) 101 . 07 102 . 9055 106 . 42 107 . 8682 112 . 411 114 . 818 118 . 710 121 . 760 127 . 60 126 . 9045 131 . 29 55 56 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 . 9054 137 . 327 Lu 178 . 49 180 . 9479 183 . 84 186 . 207 190 . 23 192 . 217 195 . 08 196 . 9665 200 . 59 204 . 3833 207 . 2 208 . 9804 (209) (210) (222) 87 88 104 105 106 107 108 109 ** Fr Ra Ac– Rf Db Sg Bh Hs Mt (223) (226) Lr (261) (262) (263) (262) (265) (266) 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 138 . 9055 140 . 115 140 . 9077 144 . 24 (145) 150 . 36 151 . 965 157 . 25 158 . 9253 162 . 50 164 . 9303 167 . 26 168 . 9342 173 . 04 174 . 967 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr (227) (232 . 04) (231 . 04) (238 . 03) (237) (239) (243) (247) (247) (251) (252) (257) (258) (259) (262) ln[ A ] t = - kt + ln[ A ] o k = Ae - Ea/RT 1 [ A ] t = kt + 1 [ A ] o ln k 1 k 2 = E a R 1 T 2 - 1 T 1 K p = K c ( RT ) Δ n half life = 0.693/k half life = 1/(k [A] 0 ) [H + ] = K a [HA] [A - ] R = 0 . 0820 l · atm · K - 1 · mol - 1 = 8 . 31 J · K - 1 · mol - 1 F = 96500 coulombs/mole Δ G = Δ H - T Δ S Δ G = Δ G o + RT ln Q Δ G o = - nFE o E = E o - RT nF ln Q E = E o - 0 . 0592 n log Q x = - b ± b 2 - 4 ac 2 a
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Part I – Multiple Choice. Answer the following questions on the multiple choice scantron answer sheet provided. Each question is worth 4 points. 1. A sodium chloride saline solution begins to freeze at - 1.13 C. Express the concentration of NaCl in this solution in mass percent. K f for water is 1.86 C · m - 1 . A) 3.43% B) 1.78% C) 0.870% D) 17.8% E) 8.90%
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