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CHM1045 Fall07 Final Exam v1

CHM1045 Fall07 Final Exam v1 - CHM 1045Finat Exam Fall2007...

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CHM 1045 Finat Exam Fall2007 Section # 01 - 07 and ll - l7 December 12, 2007 Wednesday Total points: 300Time: 2 hours Instructor: MASUD MOIYWAR, Ph.D. Name: Question # Score/ Question Student's Score 1 28 2 84 3 47 4 30 5 20 6 57 7 34 Total 300 This EXAM contains 7 questions. A periodic table, solability chart, acid-base table, determination of oxidation number rales and electronegativity table is provided with this exam. The equations, conversion factors and constants for numerical calculations are provided where necessary. SHOW ALL YOUR WORK IYHEN YOA ARE SOLWNG NUMERICAL PROBLEMS TO GET THE FULL CREDIT. MAKE SARE ALL YOAR DOTS ARE CLEARLY WSIBLE WHEN DRAWINGLEWIS STRUCTARES. Please turn over 1
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1. a. Calculate the formal charge of the atoms in CHCI3 molecule: fEquation: Fqrmal charge: Group Number- (LPE + V2BE) [2x3 :6] b. True shucture ofNOi is a resonance hybrid of the following two structures. Determine the N - O bond orderin the true structure. Show your work. l4l f .. . L'q.- N = Sil- I r t , , 1 lO-..N-O:l l- .. .. J c. Draw Lewis structure for the following compounds: NFg, HOBr d. Draw the molecular shape of NF3 andgive the name of the shape. [4x2:8] [4+2:6] Continued to page 3 ", L Name of the molecular shape:
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e. Determine the polarity of the following molecules (circle the correct answer): f2x2: 4f CO: polu I non-polar SOz: polar / non-polar 2. a. Write down the name of the following compounds, identiff them asionic and molecular and determine theirsolubility in water: [(2+2+2)x4:24] b. Balance the following reactions and identify them as gas-forming, precipitation, acid-base and oxidation-reduction reaction. t(8+4)x2:24) Ba(OH)z (aq) + HrPOr (aq) ---) Ba:(PO+)z (aq) + HzO 0) Type of reaction: NlI4Cl (aq)+ Ba(oH), (aq) ---) -NHr (e) + BaClz (aq) + -Hzo (l) Type of reaction: c. Give the balanced net ionic equation of the following reactions and identify the spectator ions: (if there is nol net ionic equation, write down 'NO NET IONIC EQUATION') [(4+4)x2:16] i) PbCl2 (aq) + 2KI (aq) -----------) PbIz (s) + 2 KCI (aq) Net Ionic Equation: Continued to page 4 ?
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