L09 Water properties(1)

L09 Water properties(1) - Geol 107 L09 9/12/2011 The...

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Geol 107 L09 9/12/2011 1 The Special Nature of Water Where is all the water? 1,386,000,000 km 3 total water in the hydrosphere Hydrologic Cycle units: km 3 /yr Atoms and Compounds Atoms (basic unit of matter) protons (+) neutrons electrons ( Ͳ ) Molecules (groups of atoms) Covalent bonds Ionic bonds Hydrogen bonds 105 ° Water is a Polar Molecule Positive Negative Hydrogen bonds in water
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Geol 107 L09 9/12/2011 2 Hydrogen bonds in water Are weak but still strong enough to result in: 1. High surface tension 2 High solubility of chemical compounds in wate 2. High solubility of chemical compounds in water 3. Solid, liquid, gas at Earth±s surface 4. Unusual thermal properties 5. Unusual density response to temperature changes Water is an excellent solvent Solution: two or more components, with uniform molecular properties throughout Solvent (usually a liquid) is more abundant Solute (usually a solid or gas) is the less abundant component Ocean Salinity per mil (parts per thousand) Salinity is Conservative
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L09 Water properties(1) - Geol 107 L09 9/12/2011 The...

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