PAST EXAMS - FINAL - FALL 06

PAST EXAMS - FINAL - FALL 06 - CHM 2045 Final Exam (Form...

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CHM 2045 Final Exam (Form Code A) December 9, 2006 Instructions: This exam consists of 30 multiple choice questions each worth 10 points for a total maximum of 300 pts. You may retain your exam sheet (mark your answers on it). Turn in only the scantron. You may not use anything but your own calculator and pencil during this exam. Your name on this exam states the assertion: “ I hereby pledge that I have neither given nor received unauthorized aid during this exam.” Possibly useful info: Avogadro’s # = 6.022x10 23 mol -1 Rydberg constant = 1.097x10 7 m -1 Gas constant R = 8.3144 J/K mol R = 0.08206 L atm/K mol Specific heat capacity (C) of water = 4.184 J/g K Planck’s constant (h) = 6.626x10 -34 J s 1 atm = 760 torr = 760 mmHg speed of light (c) = 3x10 8 m/s 1. Which of these has the largest number of unpaired electrons ? (1) Cr 2+ (2) Mn 4+ (3) Co 2+ (4) Cu 2+ (5) Br - 2. Rank these in the order of increasing first ionization energy : Li, Be, B (1) B< Be< Li (2) B<Li<Be (3) Be<B<Li (4) Be<Li<B (5) Li<B<Be 3. Rank these in the order of increasing melting point: KCl, MgCl 2 , NCl 3 (1) KCl<MgCl 2 <NCl 3 (2) NCl 3 <KCl<MgCl 2 (3) NCl 3 <MgCl 2 <KCl (4) MgCl 2 <NCl 3 <KCl (5) MgCl 2 <KCl<NCl 3 4. For the molecule CH 3 -CH=C=O, the 3 carbons are hybridized as (left to right): (1)sp,sp 2 ,sp 2 (2) sp 2 ,sp,sp (3) sp 3 ,sp 2 ,sp 2 (4) sp 3 ,sp,sp 2 (5) sp 3 ,sp 2 ,sp 5. How many moles of CH 4 are required to heat 1.00 kg of water from25.0 0 C to 90.0 0 C by the reaction shown? Use 4.18 J/g 0 C as the specific heat of water CH 4 (g) + 2O 2 (g) CO 2 (g) + 2 H 2 O(g) Δ H = -1196 kJ/mol (1) 0.114 mol (2) 0.227 mol (3) 0.272 mol (3) 0.455 mol (5) 4.40 mol 6. A reaction has a rate constant of 10.6 s
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PAST EXAMS - FINAL - FALL 06 - CHM 2045 Final Exam (Form...

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