Week_1_Answers

Week_1_Answers - 1 Lewis Structures Week 1 1. Draw complete...

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C H H H H OH C H H H Br C H H H C H H O H C H O HC N CC H H H H H C H H H O C H H H N H H N H H H H O H H H H H Lewis Structures 1. Draw complete Lewis structures, showing all atoms and lone pairs, for the following molecules. CH 4 CH 3 CH 3 CH 2 OH H 2 CO HCN C 2 H 2 CH 3 NH 2 OH CH 3 O NH 4 + H 3 O + C 2 H 4 1 Week 1
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CO H H H C C C C H H H H H H H H H H C H O H H C H N H N C C H H H H H H N C C H H H H H H H H CC C H H H PC CH 3 H 3 C 3 3 3 Formal Charge 1. Given the following Lewis structures, identify the formal charge on all the non-hydrogen atoms. You may assume that all atoms and lone pairs are shown completely and correctly. (anything not marked has a formal charge of zero) 2 Week 1
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H 3 C C CH 3 O H 3 C C O O H 3 C C NH 2 O C 3 H 3 C O 3 HC N H C H 3 C C C O 3 3 H 3 C C 3 O H 3 C C O O H 3 C C 2 O C 3 H 3 C O 3 N H C H 3 C C C O 3 3 Resonance 1. For each of the following, complete the Lewis structure by drawing in all the implied lone pairs. Then draw the single best alternate resonance structure. Then indicate which of the two structures is more stable, or if they are equally stable. + + + more stable + equally stable equally stable 3 Week 1
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CN H Orbitals and Hybridization 1. Each of the following species contains a carbon-nitrogen bond. Give the hybridization of both the carbon andnitrogenatoms ,descr ibehoweachoftheorb ita lsisused(for σ -bonding, π -bonding, lone pairs, etc.), and how these orbitals form the carbon-nitrogen bond. N C H H H H H N C H H H H H H H C H N H + C: sp 3 hybrid, used to make 4 σ -bonds. N: sp 3 hybrid, used for 3 σ -bonds and one lone pair. The C-N single bond is formed from the σ -bond between C and N. 3 σ -bonds. 3 hybrid, used for 4 σ -bonds. σ -bond between C and N. 2 hybrid, used to make 3 σ -bonds and 1 σ -bond. 2 hybrid, used for 2 σ -bonds, 1 π -bond, and 1 lone pair. The C-N double bond is formed fromthe σ -bond between C and N sp 2 orbitals, and the π -bond between the C and N unhybridized p-orbitals. C: sp hybrid, used to make 2 s-bonds and 2 p-bonds. N: sp hybrid, used for 1 s-bond, 2 p-bonds, and 1 lone pair. The C-N triple bond is formed fromthe s-bond between C and N sp orbitals, and the two p-bonds between the C and N unhybridized p-orbitals. 4 Week 1
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