22_marine_chemistry_1

22_marine_chemistry_1 - Marine Chemistry I Outline...

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1 Marine Chemistry I Outline Friday (Today) Physical Properties of Water Salinity Other constituents in seawater Monday Geochemical Cycles Residence time Conservative constituents Non-Conservative constituents Chemistry of Water
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2 The Molecular Structure of Water + + - - polar covalent bonds non-bonding electrons Dissolving Power of Water highest of any substance known solvation effects – must consider the molecular interactions between water (solvent) and dissolved substances (solutes) Simple case: NaCl solid Na + solvated + Cl - solvated Na + Cl - The Hydrogen Bond Hydrogen Bond + + - - + + - - electrostatic attraction between partial + and – charges on separate molecules
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3 Three States (Phases) of Water Two opposing forces determine the structure of water in its three phases: H-bonds hold water molecules together Thermal (kinetic) energy pushes molecules apart increases with increasing temperature solid, liquid gaseous Three States (Phases) of Water Low temperature limit E H-bond > E thermal maximum number of H-bonds maximum order, low thermal motion regular lattice structure of ice ice (solid) Three States (Phases) of Water The intermediate case E H-bond E thermal clusters of H-bonded water (structural water) interspersed non-H-bonded water (free water) liquid water
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