mcb450-2f09 - Lecture 2 Water The Medium of Life Mintel...

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Unformatted text preview: Lecture 2 Water: The Medium of Life Mintel Office Hours Today 1:45-3:00, Noyes 208 Announcements • Ordinarily lecture slides are posted within two working days after class. • A complete set of slides from Spring 2009 is on the website. • Every hourly examination RM has used in the last four years is on the website. • Videos are made of each class and are posted. A complete set from Spring 2009 is posted. Fred Diehl – Univ. of Virginia Fred Physical Properties of Compounds Compound MP ( o C) BP ( o C) ∆ H vap (cal/g) ∆ H fus (cal/g) H 2 O 100 540 80 H 2 S-83 60 132 16.7 NH 3-78-33 327 84 Fig. 2-1, p. 29 A Water Molecule Structure of Ice – Hydrogen Bonding • Each molecule of water can be hydrogen- bonded to up to four other water molecules Fig. 2-2, p. 29 Structure of Ice Liquid Water • Lacks the lattice-like structure of ice. • H-bonds are not collinear with a line joining the centers of the atoms involved. • Therefore the H-bonds are weaker and water is fluid. • H-bonds are dynamically formed and broken. Fig. 2-3a, p. 30 Dynamic Formation of H-bonds in liquid water. Note the time scale. Solvent Properties of Water • Example – Solubility of sodium chloride • Sodium and chloride ions are hydrated. • Water molecules are oriented in an opposite direction about sodium and chloride ions, because the interaction is electrostatic. Fig. 2-4, p. 31 Water’s Dielectric Constant Solvent D Water 78.5 Methanol...
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mcb450-2f09 - Lecture 2 Water The Medium of Life Mintel...

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