PS1-key

PS1-key - Problem Set 1-Answer Key BILD1 FA 2008 1) Using...

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δ + H H O δ + δ - Problem Set 1-Answer Key BILD1 FA 2008 1) Using water as an example, explain what a polar molecule is. Using the stick diagram, label which atoms are positively or negatively polarized. Water, is a compound, that has a very electronegative (pulls electrons towards itself) atom ,Oxygen, that is covalently bonded to 2 Hydrogen atoms (not very electronegative), As a consequence of these covalent bonds – the shared electrons are pulled toward the Oxygen atom and causes Hydrogen to become positively (+) polarized. Oxygen, having drawn the the shared pair of electrons towards itself, becomes negatively polarized. The symbol - δ + and - is used to depict positively and negatively polarized atoms, respectively. NOTE: Because water is polar – it can H-Bond. 2) For each molecule shown, decide if it can accept a hydrogen bond, donate a hydrogen bond, do both, or do neither. Circle the H that acts as a donor H. Indicate the H’s that can not participate in H bonding with an arrow. a) CH 3 - CH 2 -O- CH 2 - CH 3 b) CH 3 -0H c) CH 3 - NH-CO-CH 3 d ) C H 3 - CH 2 - CH 2 - CH 3 e) CH 3 - CH0H-CHOH- CH 3 f) H 2 = Hydrogen that can not participate in H-Bonds = Donor Hydrogen a) accept only (Oxygen accepts) b) Donate Accept c) Donate and Accept (Nitrogen and oxygen d) No donor, no acceptor e) Donate and Accept f) No donor, no acceptor
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Accept only Donate and accept only
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This note was uploaded on 04/11/2010 for the course BILD 1 taught by Professor Boulanger during the Spring '08 term at UCSD.

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PS1-key - Problem Set 1-Answer Key BILD1 FA 2008 1) Using...

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