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 . It contains a large number of strained or broken hydrogen bonds,
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This note was uploaded on 02/18/2012 for the course CHEM 114A 114A taught by Professor Viadiu during the Fall '08 term at UCSD.

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

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