ch369_f09_class_2_notes

ch369_f09_class_2_notes - Cl ass 2. Aqueous Chem st r y (...

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Cl ass 2. “ Aqueous Chem i st r y” ( chem i st r y i n wat er )
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Surviving in Varied Environments Microorganisms are known to survive at temperatures from +113 o C to -10 o C but never without liquid water
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The human body is about 60% by weight water.
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Wat er cont ai ns one O and t wo H at oms, l i nked by si ngl e coval ent bonds. The over al l char ge i s zer o, but t he O at om has par t i al negat i ve char ge ( due t o bei ng mor e el ect r onegat i ve) and H at oms have par t i al + char ge. Wat er i s pol ar ( non- uni f or m char ge di st r i but i on, can f or m H- bonds) . Not l i near , bond angl e i s about 105 degr ees. Compar e wi t h CO 2 ( l i near mol ecul e) and CH 4 ( t et r ahedr al ) .
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Figure 2.02. Electronic structure of the water molecule hydrogen unshared electron pairs
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A hydrogen bond between water molecules
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Remember t he def i ni t i on of hydr ogen bonds ? ( an at t r act i ve f or ce bet ween a H at om t hat i s bonded t o ei t her O, N or F and anot her el ect r onegat i ve at om, such as O, N, or F)
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van der Waals radii
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A snapshot of l i qui d wat er , f r om wat er wi ki . Hydr ogen bonds bet ween mol ecul es of l i qui d wat er br eak and r ef or m f r equent l y. Mol ecul es of l i qui d wat er cont i nuousl y change t hei r nei ghbor s.
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Hydr ogen bonds ar e much mor e easi l y br oken t han coval ent bonds.
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bonds ar e st r ong enough t o be usef ul , yet weak enough so t hat t hey can be r ever si bl y
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This note was uploaded on 01/21/2010 for the course CH 369 taught by Professor Kbrowning during the Fall '07 term at University of Texas at Austin.

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ch369_f09_class_2_notes - Cl ass 2. Aqueous Chem st r y (...

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