BioChem Ch. 2 Aqueous Chemistry

BioChem Ch. 2 Aqueous Chemistry - CHAPTER2AqueousChemistry...

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CHAPTER 2 --Aqueous Chemistry I. Water (H20) A. Functions 1. Solvent ("the matrix of life") a. Location of metabolic reactions b. Regulation of pH (dissolves buffers) c. Delivery of nutrients d. Removal of wastes 2. Reactant Molecule a. Hydrolysis b. Photosynthesis c. Respiration (generates water) 3. Temperature Stabilizer a. heat capacity of water b. Absorbs energy released by reactions. B. Types of noncovalent bonds 1. Van der Waals interactions (London Forces and dipole-dipole interactions) 2. Hydrogen bonds 3. Hydrophobic interactions 4. Ionic bonds C-H= 0.4 Nonpolar covalent bond N-H= 0.9 Polar covalent bond 0.4 and less = nonpolar covalent bond more than 0.4 = polar covalent bond C. Common properties of noncovalent bonds
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2. Reversibility 3. Specific binding Strongest-----> Weakest -Covalent Bonds - Ionic Interactions -Hydrogen bond -Van der Waals Interactions D. Structure of Water 1. Nonlinear (bond angle= 104.5 ) ˚ 2. Polar (electronegativity difference =1.4) a. Partial negative "head" =Oxygen b. Partial Positive "tails" =Hydrogens E. Hydrogen bonding (X-H. ..A) 1. Between water molecules a. Bond distance =0.18 nm b. Bond energy (strength) = 20 kJ/mol Electron Donors Hydrogens in water bonding Electron Acceptors always have unshared electons in water bonding it is the Oxygen. 2. With functional groups in other polar molecules
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This note was uploaded on 10/06/2008 for the course CHM 232 taught by Professor Tba during the Fall '08 term at Grand Valley State.

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BioChem Ch. 2 Aqueous Chemistry - CHAPTER2AqueousChemistry...

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