exam 2 answers - Iype, Shelby Exam 2 Due: Oct 18 2007,...

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Iype, Shelby – Exam 2 – Due: Oct 18 2007, 11:00 pm – Inst: Vandenbout 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. VandenBout 2 PM ONLY ! ! 001 (part 1 oF 1) 10 points Which oF the Following will not have ionic bonds? 1. methane (CH 4 ) correct 2. magnesium chloride 3. calcium oxide 4. NaCl 5. KBr Explanation: All oF the options except CH 4 have ionic bonds, which are Formed between metals and nonmetals. CH 4 has only covalent (non- metal-nonmetal) bonds. 002 (part 1 oF 1) 10 points The bond angle in NH 3 is (smaller, larger) than the bond angle in CH 4 because 1. smaller; the unshared pair oF electrons on nitrogen is more repulsive to the bonded electron pairs. correct 2. larger; the hybridization oF nitrogen re- sults in larger bond angles than the hybridiza- tion oF carbon. 3. smaller; the bond angles in trigonal planar molecules are smaller than those in tetrahe- dral molecules. 4. smaller; nitrogen is smaller than carbon. 5. larger; the bond angles in trigonal planar molecules are larger than those in tetrahedral molecules. 6. larger; nitrogen is larger than carbon. 7. smaller; the hybridization oF nitrogen results in smaller bond angles than the hy- bridization oF carbon. Explanation: Lone pairs repel shared (bonding) pairs oF electrons more strongly. 003 (part 1 oF 1) 10 points The chemistry oF an element is largely deter- mined by 1. its mass. 2. its valence electrons. correct 3. its relative abundance. 4. its number oF total electrons. 5. its core electrons. Explanation: The chemistry oF an element is largely de- termined by its valence electrons. 004 (part 1 oF 1) 10 points Carbon has a valence oF Four in nearly all oF its compounds and can Form chains and rings oF C atoms. Consider the cyclopropene structure. C C C H H H H c a b What hybridizations would you expect For the carbon atoms identifed by a, b, and c, respectively? 1. sp 2 , sp, sp 2. sp 3 , sp 3 , sp 2
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Iype, Shelby – Exam 2 – Due: Oct 18 2007, 11:00 pm – Inst: Vandenbout 2 3. sp 3 , sp, sp 3 4. sp 3 , sp, sp 5. sp 2 , sp 2 , sp 3 correct 6. sp 3 , sp 2 , sp 3 7. sp 2 , sp, sp 2 Explanation: C C C H H H H sp 3 sp 2 sp 2 005 (part 1 of 1) 10 points What is the electronic geometry around ni- trogen in the molecule CH 3 CH 2 NH 2 ? 1.
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exam 2 answers - Iype, Shelby Exam 2 Due: Oct 18 2007,...

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