CHEM301 F10 CA2 key

CHEM301 F10 CA2 key - CHEM301, Fall 2010 Dr. Ruder 1 Class...

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CHEM301, Fall 2010 Dr. Ruder 1 Class Activity 2 Resonance Structures Two or more Lewis structures differ only in the placement of electrons. Model 1: Resonance Structures for a Carbonyl Group O C H 3 C CH 3 O C H 3 C CH 3 I II Questions: 1 . (a). How many total electrons are in structures I (____ 24 ______) and II (__ 24 _______)? Is the total number of electrons in each structure the same? ( yes or no) (b). How many single bonds are in structures I (___ 9 _______) and II (____ 9 ______) ? Is the number of single bonds the same in each structure? ( yes or no) (c). How many lone pair electrons are in structures I (__ 4 ________) and II (____ 6 _______) ? Is the number of lone pair electrons the same in each structure? (yes or no ) (d). How many pi electrons are in structures I (___ 6 _______) and II (____ 6 ______) ? Is the number of pi electrons the same in each structure? ( yes or no) (e). Based on the answers above, describe what is different between structures I and II (in terms of electrons)? The placement of lone pair and double bond electrons is different. 2. Is the net charge of structure I the same as the net charge of structure II ? ( yes or no) 3. What do the curved arrows show in the above structure? Curved arrows show movement of electrons. Model 2: Rules for Drawing Resonance Structures: 1 . Move lone pair electrons on an atom to form a new double bond to that atom (arrow a). 2
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CHEM301 F10 CA2 key - CHEM301, Fall 2010 Dr. Ruder 1 Class...

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