Hydrophobic_Effect_upload - Hydrophobic Effect Properties...

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Hydrophobic Effect
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Properties of water Density max at 4 ° High melting and boiling points Unusually large heat capacity Crystalline water: Pattern and geometry fixed Each molecule participates in 4 H- bonds Tetrahedrally coordinated
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H-bonding in the liquid phase Transient H-bonding clusters Microscopic “icebergs” of various sizes (varied H-bonding patterns and geometries) Unbounded waters: more translational freedom, more closely together
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Apolar (greasy) molecules in water Apolar molecules form stable “crystalline hydrates”: Water molecules form a cage- like polyhedron that encloses a cavity (apolar substance inside cavity) Model of a pentagonal dodecahedron: Cavity is about 5 Angstrom in diameter Cluster of pentagonal dodecahedra
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These clusters are very stable (Significant freezing point elevation, if concentration of apolar molecule high enough) Clathrate structures: Ordered cages of water with
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  • Spring '14
  • hydrophobic effect, Hbonds

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