Chem 114 Water - Water What are the properties of water...

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Water What are the properties of water? What is pH? What are the buffers and what do they do? Biochemical importance of water Saturday, October 1, 2011
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Structure of water -Two lobes of negative density formed by the lone-pair electrons of the oxygen atom. -This electron density contributes substantially to the large dipole moment and polarizability of the water molecule. -The dipole moment gives a 33% ionic character to the O-H bonds. -The H-O-H angle is 104.3 o , not 109 o as in CH 4 ; many properties derive from this angle. Saturday, October 1, 2011
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What are some of the unique properties of water? Saturday, October 1, 2011
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Properties of water High boiling point High melting point High heat of vaporization High surface tension All these properties indicate that intermolecular forces of attraction between water molecules are high. Saturday, October 1, 2011
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Properties of water High dielectric constant Maximum density found in the liquid state, not the solid state Negative volume of melting (ice occupies more space than liquid water) Unique network of hydrogen bonds. Saturday, October 1, 2011
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Saturday, October 1, 2011
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Hydrogen bonds are the basis of these intermolecular forces Liquid water consists of water molecules held in a random, three dimensional network with tetrahedral geometry .
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