water_ppt - Earth… The Water Planet Why are we studying...

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Unformatted text preview: Earth… The Water Planet Why are we studying water? All life occurs in water ¡ inside & outside the cell Water supports all life on Earth aybe ot so lentiful fter ll… What makes water so darn special? Nothing very fancy about that… It’s the polarity, silly. http://programs.northlandcollege.edu/biology/Biology1111/animations/hydrogenbonds.html H and O share electrons, but unequally Oxygen is very electronegative, so the electrons spend more time near O than H Therefore O has a partial negative charge, while H has partial positive A story of attraction • The slight partial positively charged end (H’s) is attracted to the slightly negatively charged end (Oxygen) of other H 2 0 molecules • These weak bonds are broken and reformed constantly, but are the source of water’s many amazing properties One H 2 0 molecule can hydrogen bond with how many other H 2 0 molecules? Water extraordinaire…. he many wonders of water… • Special properties of water – cohesion & adhesion • surface tension, capillary action – good solvent • many molecules dissolve in H2O • hydrophilic vs. hydrophobic – lower density as a solid • ice floats! – high specific heat • water stores heat – high heat of vaporization • heats & cools slowly I like the part about the ice! Hydrogen bonding between water molecules causes them to be ‘sticky’ cohesion-surface tension-drinking straw Water forms drops, pours, overfills...
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This note was uploaded on 09/22/2010 for the course ABD. 39283 taught by Professor Dr.met during the Spring '10 term at Aachen University of Applied Sciences.

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water_ppt - Earth… The Water Planet Why are we studying...

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