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02Water - Bio 20A-M Dalbey Assigned Reading WATER(Chapter 2...

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Bio 20A-M. Dalbey WATER (Chapter 2) 1/7/09 1 of 4 H O X H X 2-D Represen tations of the Water Molecule The represen tation on the le ft does notshow the2 e lectrons inthe1s orbi tal of Oxygen because they are no t "Valence Electrons" (ie. they do notparticipate in bonding ). These represen tations obscu re the true 3D te trahedral structure ofwater. H O H δ +0.33 ~105 o [theoretical = ~110 o ] δ +0.33 δ -0.33 δ -0.33 H H H O H ~0.10 nm 460 kJ / mole ~0.18 nm 20 kJ / mole Association of 2 Water Molecules by Intermolecular Hydrogen Bonding O 0.28 nm In an isolated, H-bondedpair of water molecules, bot arefreeto rotate about theH bond axis. Assigned Reading: Chapter 2 Section 2.4 p. 31 The structure of the water molecule HYDROGEN BONDING Linus Pauling developed concept of H-bonding to explain the unusual properties of liquid H 2 O. H bonds are 10X stronger than VDW interactions in ordinary liquids, 10X weaker than covalent bonds. Note that in a H 2 O dimer, both molecules are free to rotate about the axis of the H bond.
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