BCH 2333 Lecture Notes - Lecture 2: Hydrophile, Surface Tension, Lone Pair
26 Jan 2016
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Document Summary
Can form micelles by aligning tail to tail. Roles: structure (cellulose in in bacteria), energy. cell wall plants and cell wall. Properties of water: life is everywhere water is. Very polar: sp3 hybridized; 2 lone pairs of, tetrahedral geometry (109. 5o) electrons. Actually 104. 5o because the dipole moment is so large. Oxygen is highly electronegative electrons: en = attraction of atom for bonding, oxygen = 3. 5; very electronegative, hydrogen = 2. 2. High boiling point, mp, heat of vaporization, surface tension. Bond polarities - sum of dipoles gives the overall dipole moment. H bonds are very strong non covalent bonds. One water molecule can associate with 4 other water molecules: ice: 4 h bonds per water molecule. Forms the crystal lattice of ice: water: 3. 4 h bonds per water molecule. Average of at least 3 h"s per molecule very dynamic bond. Biomolecule shapes and interactions are mediated by 4 types of non- Waals attraction: london force (dispersion force) fritz.
