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Chemistry 222 General Chemistry Problem Set 2 Answers

Chemistry 222 General Chemistry Problem Set 2 Answers -...

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Chemistry 222-500 Spring 2007 Hybrid Orbitals and Multiple Bonds 1. Consider the acetonitrile molecule: a. Predict the bond angles around each carbon atom. Approximately 109.5 o around the left C, and 180 o on the right C b. Give the hybridization at each of the carbon atoms. From left to right, they are sp 3 and sp c. Determine the total number of σ and π bonds in the molecule. Five σ bonds and two π bonds 2. Consider this structure of glycine, the simplest amino acid. Note: lone pair electrons are NOT shown in this structure. a. What are the approximate bond angles about each of the two carbon atoms, and what are their hybridizations? Approximately 109.5 o and sp 3 around the left C, and 120 o and sp 2 on the right C b. What are the hybridizations of the two oxygen atoms and the nitrogen atom, and what are the approximate bond angles at the nitrogen? The O with the double
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Unformatted text preview: bond is sp 2 hybridized, while the O with two single bonds is sp 3 hybridized. The N is sp 3 hybridized and has bond angles of approximately 109.5 o . c. What are the numbers of σ and π bonds in the molecule? Nine σ bonds and one π bond 3. The compound shown below is acetylsalicylic acid, better known as aspirin. Note: lone pair electrons are NOT shown in this structure. C N C H H H H N H C H H C O O H C C C C C C C O O H O C O C H H H H H H H 1 2 3 a. What are the approximate values of the bond angles marked 1, 2, and 3? The bond angles are 120 o , 120 o , and <109.5 o , respectively. b. What hybrid orbitals are used by the central atoms of each of these angles? In numerical order, they are sp 2 , sp 2 , and sp 3 hybridized c. How many σ bonds are in the molecule? Twenty one σ bonds...
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