PracticeQuestionsChapter1-key

PracticeQuestionsChapter1-key - ANSWER KEY for Practice...

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1 ANSWER KEY for Practice Questions (Quiz 1 and Exam 1) 1. (15 pts) Fill in the empty boxes in this portion of the periodic table with the appropriate elements. 3A H Li Na Be 1A 8A 5A 4A He BCNOF Si P S Cl Br 2A 7A 6A 2. (6 pts) Give the indicated hybridization, geometry, and bond angles for the following molecule. H 3 C C OH O NH 2 Hybridization of the atom Hybridization of the atom Hybridization of the atom What type of orbital (hybridization) is the lone pair in? What is the H-N-H bond angle? What is the indicated bond angle sp 2 120° sp 3 109.5° sp 2 sp 2 3. (4 pts) Draw perspective formulas (using wedges and dashes to indicate in-plane and out-of plane bonds) for CH 2 Cl 2 and CCl 4 and use these drawing to indicate which of the two has a molecular dipole. CH 2 Cl 2 CCl 4 Cl Cl H H Cl Cl Cl Cl has a dipole cancel 4. (6 pts) Add formal charges to the following molecule and draw a second resonance structure where every atom has a closed shell configuration. Circle the resonance structure which is the major (most important) contributor. H O N O +– H O N O no formal charges On an exam, you would be doing this without referring to a periodic table.
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Practice Questions for Exam 1 2 5. (6 pts) Draw the Lewis structure for each of the following diatomic molecules where each atom possesses and octet (i.e., the best Lewis structure). NO + NO CO NO + CO + 6. (4 pts) Draw a Lewis structure for each molecule below. Circle the pair of molecules which have the same geometry (i.e. planar or pyramidal). N H H H O H H H + HC H H + NH 3 H 3 O + CH 3 + 7. (4 pts) Draw a Lewis structure for each molecule below. Indicate (circle) which molecules (if any) will have a molecular dipole. (Hint: consider the hybridization of the central atom) CO 2 NO 2 + NO 2 N O O C O O N O O + N is sp 2 hybridized bent geometry 8. (4 pts) Draw acceptable Lewis structures of the following uncharged compounds by adding all the necessary nonbonding electrons and multiple bonds.
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This note was uploaded on 04/21/2010 for the course CHEM 2261 taught by Professor Crowe during the Fall '08 term at LSU.

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PracticeQuestionsChapter1-key - ANSWER KEY for Practice...

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