012 187 h2o molecules

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Unformatted text preview: are non ­stoichiometric CH 4 + xH 2O → CH 4 ( H 2O) x x ideal = 5.75 x actual ≈ 6.0 Some Cages are Empty! Hydrates on Earth: air hydrate (antarc+c), € methane (seafloor), H2S (GOM), CO2 (China) I Love Me Some Bacteria! Yum Yum Yum! Hydrate Worm (Gulf of Mexico) Hesiocaeca methanicola Feeds on bacteria that eat methane hydrate (methylotropic, a type of heterolithotrope). AKA Ice Worm (but that’s a different criler.) About 4cm long. •  There are lots of clathrates –  Host makes a structure –  Guest goes in middle. •  And semiclathrates –  Host makes most of a structure –  Guest goes in the middle and makes part of the structure Some ice floats. Most doesn’t. From Chapin’s page on water phases: hlp://www.lsbu.ac.uk/water/phase.html From Chapin’s page on water phases: hlp://www.lsbu.ac.uk/water/phase.html 2. Macroscopic Effects Surface Tension Viscosity Capillary Ac+on Surface Tension •  Occurs at the boundary of ALL phases •  Surfaces are usually unfavorable •  But held together by IM forces –  Stronger the force, stronger the surface •  Must overcome surface tension to break surface. Surface Tension •  The amount of work needed to increase the surface area. •  Curving a flat surface req...
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This note was uploaded on 12/13/2012 for the course CHE 2045 taught by Professor Osegovic during the Fall '12 term at University of South Florida - Tampa.

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