GEOL107_09

GEOL107_09 - Geol107L09 9/12/2011 TheSpecialNatureofWater...

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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 ( ) 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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GEOL107_09 - Geol107L09 9/12/2011 TheSpecialNatureofWater...

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