Exam2_Solutions - Make sure you are taking the right exam...

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Make sure you are taking the right exam. This is Dr. McCord’s MORNING course that is MWF from 11:00 - 12 noon, unique 53740. McCord MWF : 11am NO CALCULATORS!! 1 18 1A 8A 1 2 H 2 13 14 15 16 17 He 1.008 2A 3A 4A 5A 6A 7A 4.003 3 4 5 6 7 8 9 10 Li Be B C N O F Ne 6.94 9.01 10.81 12.01 14.01 16.00 19.00 20.18 11 12 13 14 15 16 17 18 Na Mg Al Si P S Cl Ar 22.99 24.30 3B 4B 5B 6B 7B ———8B——— 1B 2B 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 65.41 69.72 72.64 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 85.5 87.6 88.9 91.2 92.9 95.9 98.9 101.1 102.9 106.4 107.9 112.4 114.8 118.7 121.7 127.6 126.9 131.3 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 132.9 137.3 138.9 178.5 180.9 183.9 186.2 190.2 192.2 195.1 197.0 200.6 204.4 207.2 209.0 210.0 210.0 222.0 87 88 89 104 105 106 107 108 109 110 Fr Ra Ac Rf Db Sg Bh Hs Mt Ds (223) (226) (227) (261) (262) (266) (262) (277) (268) ( ) 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 140.1 141.0 144.2 145.0 150.3 152.0 157.2 158.9 162.5 164.9 167.3 168.9 173.0 175.0 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 232.0 231.0 238.0 (237) (244) (243) (247) (247) (251) (252) (257) (258) (259) (260)
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Version 377 – Exam 2 – McCord – (53740) 2 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A molecule AB 3 has eight shared electrons and follows the normal octet rule. The central atom is “A”. The atoms surrounding A are represented by B. Pick the true statement. 1. It must be an anion. 2. It has linear molecular shape. 3. It is a polar molecule. 4. It has two single bonds and two double bonds. 5. It is sp 3 hybridized. 6. It has one lone pair of electrons on A. 7. It exhibits resonance. correct Explanation: The structure for AB 3 is A B B B A molecule exhibits resonance if more than one Lewis structure can be drawn. In this case the double bond could be between the central atom and any of the B atoms. 002 10.0 points Give the molecular shape of each central atom: nitrogen, middle carbon, right carbon, respectively. H N C HO C H H H 1. linear, tetrahedral, tetrahedral 2. tetrahedral, tetrahedral, tetrahedral 3. trigonal planar, trigonal planar, tetrahe- dral 4. angular, angular, tetrahedral 5. linear, linear, linear 6. angular, trigonal planar, tetrahedral cor- rect 7. trigonal planar, trigonal planar, trigonal planar 8. linear, angular, tetrahedral Explanation: Consider the RHED on each of the atoms (three, three, and four, respectively); this specifies the electronic geometry and thus the molecular geometry. 003 10.0 points Which of the following is the correct Lewis formula for thionyl chloride (SOCl 2 )?
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