Ch 2 - Lehninger Principles of Biochemistry Fourth Edition...

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Unformatted text preview: Lehninger Principles of Biochemistry Fourth Edition Chapter 2: Water Copyright © 2004 by W. H. Freeman & Company David L. Nelson and Michael M. Cox Why is Water Special? • Hydrogen Bonds • Requirements – H bound to F, O or N • F not physiologically relevant. – Electron pair donor H-Bonds • H-Bond = 23 kJ/mol • OH bond = 470 kJ/mol • CH bond = 348 kJ/mol • Van der Walls (London) forces ~4 kJ/mol H-Bonds and Boiling Points • Why do H-bonds influence the boiling point of a solution? • What do you predict? Does Geometry Influence H-Bonds? • Why would geometry influence bond strength? • What would cause altered geometries? H atom is in a direct line between two negatively charged atoms Biological Examples Ice • Solid water floats or is less dense than the liquid. • Why? • Is this important to biology? Polar vs. Non-Polar • Hydrophobic – water fearing • Hydrophilic – water living Why do molecules dissolve in water ?water ?...
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Ch 2 - Lehninger Principles of Biochemistry Fourth Edition...

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