CH195B~1 - CHEM 161-2009 CHAPTER 10 BONDING THEORY AND...

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CHEM 161-2009 CHAPTER 10 – BONDING THEORY AND MOLECULAR STRUCTURE PRACTICE PROBLEMS DR. ED TAVSS 43 Chem 161-2006 Final Exam Chapter 10 – Bonding theory and Molecular Structure (VSEPR) Molecular structure, angles and polarity (VSEPR) What is the electron group geometry for XeF4? A. tetrahedral B. trigonal planar C. trigonal bipyramidal D. octahedral E. linear . . : F : . . .. | . . : F ― Xe ― F : . . . . | . . : F : . . D 1
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23 Chem 161-2006 Final Exam Chapter 10 – Bonding theory and Molecular Structure (VSEPR) Molecular structure, angles and polarity (VSEPR) Rank the Cl-C-Cl bond angles in the compounds below from smallest to largest? (Smallest angle first, largest angle last) I. NCl 3 II. SiCl 4 III. Cl 2 O IV. BCl 3 A. IV<II<I<III B. I<IV<II<III C . III<I<II<IV D. I<II<III<IV E. II<IV<III<I . . : Cl : . . | . . <109.5 o : Cl ― N ― Cl : . . . . . . . . :Cl: . . | . . :Cl―Si―Cl : 109.5 o . . | . . :Cl: . . . . . . . . :Cl O Cl : <<109.5 o . . . . . . . . : Cl : . . | . . : Cl ― B ― Cl : 120 o . . . . C 2
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16 Chem 161-2006 Final Exam Chapter 10 – Bonding theory and Molecular Structure (VSEPR) Molecular structure, angles and polarity (VSEPR) The molecular geometries of POCl3 and PCl5 may be described as A. tetrahedral and trigonal bipyramidal B. octahedral and trigonal bipyramidal C. trigonal bipyramidal and see-saw D. square planar and trigonal bipyramidal E. tetrahedral and square pyramidal . . : Cl : . . | . . : Cl― P ― Cl : Tetrahedral . . | . . : O : . . . . . . : Cl : : Cl : . . . . : Cl ― P ― Cl : Trigonal bipyramidal . . | . . : Cl : . . A 3
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7 Chem 161-2006 Final Exam Chapter 10 – Bonding theory and Molecular Structure (VSEPR) Molecular structure, angles and polarity (VSEPR) Which of the following molecules is/are polar? BF 3 C C Cl H Cl H C C Cl H H Cl CO 2 1 2 3 4 5 PCl 3 A . 1 and 4 B. 1 and 3 C. 2, 3 and 5 D. 3 and 4 E. 1, 2, 3, 4 and 5 . . : Cl : . . | . . Polar : Cl ― P ― Cl : . . . . . . . . : F : . . | . . Non-polar : F ― B ― F : . . . . Cl H | | C = C Non-polar | | H Cl Cl Cl | | C = C Polar | | H H . . . . : O = C = O : Non-polar A 4
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Chem 161-2005 Hourly Exam III Chapter 8 – Bonding: General Concepts Molecular structure, angles, and polarity (VSEPR) What are the bond angles around each of the indicated atoms? CH 3 CH 2 CH N CH CH 3 OH .. .. N O A. 180 ° ~ 120 B. < 109.5 < 109.5 C. ~ 120 ~ 120 D. < 109.5 180 E . < 120 < 109.5 N has three effective electron pairs and is therefore trigonal planar, with bond angles of 120 o . However, since the pi electrons need a little extra room, the CNC bond angle is a little less than 120 o . Oxygen has four effective electron pairs around it. Therefore, the COH bond angle should be 109.5 o . However, since non-bonding electron pairs require a little extra room the COH bond angle is a little under 109.5 o . 5
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This document was uploaded on 11/02/2011 for the course GEN CHEM 162 at Rutgers.

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CH195B~1 - CHEM 161-2009 CHAPTER 10 BONDING THEORY AND...

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