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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 EN 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 EN > 1 . 5 is ionic, only the two BF bonds are ionic, for a total of 2. Based on the simple rule that 1 . 5 > EN > 0 is polar covalent, the BN bond and two NH 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 BB 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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- Spring '07