OCHEM Exam 1 - Bocknack CH 310M/318M Spring 2007 Midterm...

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Bocknack CH 310M/318M – Spring 2007 – Midterm Exam #1 – Answer Key 2 Part I – All answers to questions on this page must be submitted on the bubble sheet, using a #2 pencil. Only answers submitted on the bubble sheet will be graded!!! PLEASE READ EACH QUESTION VERY CAREFULLY !!! To answer Questions 1 through 4, you will probably find it helpful to draw a Lewis structure for the molecular formula CCl 3 . Space is provided below for you to draw your Lewis structure, but only the answers to the questions relating to this structure will be graded! CCl 3 1. (2 points) What is the total number of valence electrons that should be shown explicitly as bonding pairs and/or lone pairs in the correct Lewis structure for CCl 3 ? A. 22 B. 23 C. 24 D. 25 E. 26 2. (4 points) What is the total number of electron groups surrounding the central carbon atom in the correct Lewis structure for CCl 3 ? Use the definition of “electron group” that we discussed when we talked about VSEPR theory! A. 2 B. 3 C. 4 3. (4 points) What is the geometrical arrangement of electron groups surrounding the central carbon atom in the correct Lewis structure for CCl 3 ? A. Trigonal planar B. Tetrahedral C. Linear 4. (4 points) Is this molecule polar or nonpolar ? The molecule is nonpolar if the net molecular dipole moment is zero. The molecule is polar if the net molecular dipole moment is not zero. A. Polar molecule B. Nonpolar molecule To answer Questions 5 through 8, you will probably find it helpful to draw a Lewis structure for the molecular formula C 2 Br 2 . The C atoms are bonded to each other and to one Br atom in this molecule. Space is provided below for you to draw your Lewis structure, but only the answers to the questions relating to this structure will be graded! C 2 Br 2 5. (2 points) What is the total number of valence electrons that should be shown explicitly as bonding pairs and/or lone pairs in the correct Lewis structure for C 2 Br 2 ? A. 22 B. 23 C. 24 D. 25 E. 26 Part I continues on Page 3… Cl C Cl Cl If Q2 answer = B, full credit for Q3 answer = A If Q3 answer = A, full credit for Q4 answer = B C C Br Br If Q6 answer = B, full credit for Q7 answer = A If Q6 answer = C, full credit for Q7 answer = B If Q7 answer = A or B, full credit for Q8 answer = A
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Bocknack CH 310M/318M – Spring 2007 – Midterm Exam #1 – Answer Key 3 Part I – All answers to questions on this page must be submitted on the bubble sheet, using a #2 pencil. Only answers submitted on the bubble sheet will be graded!!! PLEASE READ EACH QUESTION VERY CAREFULLY !!! 6. (4 points) Each carbon atom should be surrounded by the same number of electron groups if your Lewis structure is correct. What is the total number of electron groups surrounding each carbon atom in the correct Lewis structure for C 2 Br 2 ? Use the definition of “electron group” that we discussed when we talked about VSEPR theory! A.
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OCHEM Exam 1 - Bocknack CH 310M/318M Spring 2007 Midterm...

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