q3f08 - Version PREVIEW – Quiz 3 – JOHNSON –(53755 1...

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Unformatted text preview: Version PREVIEW – Quiz 3 – JOHNSON – (53755) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. LDE Identifying Bonds 001 001 10.0 points How many polar ionic, polar covalent and non-polar covalent bonds are present in the Lewis structure shown below? Base your an- swer on simple ΔEN considerations. B B F b b b b b b F b b b b b b N b b H H 1. 0; 3; 3 2. 2; 4; 0 3. 0; 5; 1 4. 2; 3; 1 correct 5. 0; 6; 0 Explanation: Based on the simple rule that ΔEN > 1 . 5 is ionic, only the two B—F bonds are ionic, for a total of 2. Based on the simple rule that 1 . 5 > ΔEN > 0 is polar covalent, the B—N bond and two N—H bonds are polar covalent, for a total of 3. Lastly, any bond between an atom and another of the same atom is non-polar covalent, so the one B—B bond is non-polar covalent, for a total of 1. VSEPR Electron Geometry 001 002 10.0 points In the Lewis structure for dimethylamine (CH 3 NHCH 3 ), what are the bond angles, hy- bridization and electronic geometry of the ni-...
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This note was uploaded on 03/04/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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q3f08 - Version PREVIEW – Quiz 3 – JOHNSON –(53755 1...

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