PS1-Key - Problem Set 1-Answer Key BILD1 FA 2009 1) Using...

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δ + H H O δ + δ - Problem Set 1-Answer Key BILD1 FA 2009 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 0 H b ) C H 3 -0- CH 3 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) Donate and Accept (Oxygen accepts) b) Accept only 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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This note was uploaded on 12/17/2009 for the course BIOL 1 taught by Professor Patrick during the Fall '09 term at CSU Northridge.

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PS1-Key - Problem Set 1-Answer Key BILD1 FA 2009 1) Using...

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