Lecture 06

Lecture 06 - Ionic structure of water helps it to dissolve other materials Three States of Water • Gas(water vapor each molecule is energetic and

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Lecture 6: Characteristics of Water Water is an amazing chemical that is essential for stable biological communities (as well as almost all life) to exist on our planet and for our climate system to function the way it does.
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The Earth’s Hydrosphere All water at or near the earth’s surface is termed the hydrosphere It includes atmospheric water vapor, ground water, lakes, rivers, polar icecaps, and the oceans Water distribution Oceans- 97.54% Icecaps- 1.81% Groundwater- 0.63% Everything else- 0.02%
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The Hydrologic Cycle (something so simple and yet so complex)
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Water as a Chemical Compound Water is a composed simply of two hydrogen atoms and one oxygen atom
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Water as a Chemical Compound Placement of hydrogen atoms is not symmetric, rather it creates a “polar” ionic structure
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Hydrogen bonds in liquid water
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Unformatted text preview: Ionic structure of water helps it to dissolve other materials Three States of Water • Gas (water vapor) - each molecule is energetic and separated ; T > 100° C • Liquid - some molecules link into loose groups using hydrogen bonds; 100° C > T < 0° C • Solid (Ice)- all molecules linked in rigid open crystalline structure; T < 0° C Heat capacity of water and sensible versus latent heat. Water Properties • High heat capacity – latent heat of vaporization – latent heat of melting • Density varies as a function of temperature - densest near 4 degrees C • Extremely effective solvent • Colorless (blue) in small (large) volumes • Viscosity varies as a function of temperature • Sound speed ~1500 m/sec; low frequences travel long distances...
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This note was uploaded on 05/08/2009 for the course GEOL 150Lxg taught by Professor Stott during the Spring '07 term at USC.

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Lecture 06 - Ionic structure of water helps it to dissolve other materials Three States of Water • Gas(water vapor each molecule is energetic and

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