MCB 354 Chapter Notes - Chapter Ch 2 pg 47-55, 58-65, Ch 3 pg 78-85: Bond-Dissociation Energy, Relative Permittivity, Dissociation Constant
3 Sep 2018
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Ch 2 water until to "solutes affect the colligative properties of. 70% weight of most organisms is water. Higher mp, bp, heat of vap than most other solvents - large internal cohesion. Sp3, 104. 5 , dipoles due to unequal sharing of electrons. H bonds have bond dissociation energy of about 23 kj/mol. Last 1 to 20 picoseconds, new bond forms within . 1 ps. Form bonds with 3. 4 other water molecules. Boiling and evaporating spontaneous, push toward randomness is more than h bonds. Uncharged but polar molecules dissolve in water because of stabilizing effects of h bonds. Hydrophilic - compounds that can readily dissolve. Hydrophobic - nonpolar molecules that cannot dissolve like waxes or lipids. Can dissolve salts because stabilizes anion and cation. Has high dielectric constant - physical property reflecting number of dipoles in solvent. Increase in entropy of the system is responsible for ease of dissolving salts in water. Co2, o2, n2 are nonpolar and insoluble.
