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Past Exam for CH 101 - Chemistry - A Molecular Science with Folmer at NC State (NCSU)

Exam Information

Material Type:Exam 2
Professor:Folmer
Class:CH 101 - Chemistry - A Molecular Science
Subject:Chemistry
University:North Carolina State University
Term:Spring 2009
Keywords:
  • Correct Statement
  • Either...or
  • Sp2 Hybridization
  • Combination
  • Single Bond
  • Carbon Atoms
  • Arrangement
  • Mercury (i)
  • Partial Credit
  • Ionic Bonding
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Sample Document Text

Question 1 Consider the molecule HNO2 (nitrous acid) Which of the following Lewis structures is the correct one? ER = 2 +3*8= 26 VE= 1+5+2*6=18  TP=9 shared 8  SP=4 LP= 9-4=5 The latter eliminates B . The C and D structures get awkward formal charges. A is correct: no formal charges A C H O N O B D H O N O H O O N H O O N E: none of the above Question 2 Consider the molecule hydrazine N2H4 Select the correct statement A. There is a single bond between the two N-atoms, they each have a lone pair and the H-N-H angle is about 109o. B. There is a double bond between the N-atoms and the H-N-H bond angle is about 120o. C. The hybridization on the N-atoms is sp3 and their oxidation number is -2 D. A + C are true E. B + C are true Correct answer is D. Partial credit for either A or C Question 3 Consider the molecule HCN Select the correct statement A. The H-C-N bond angle is 180o. B. There is a double bond between C and N-atoms and the H-C-N bond angle is about 120o. C. The formal charge on the C-...

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