ch369_sum10_class2_notes

ch369_sum10_class2_notes - C h a p t e r 2 . A q u e o u s...

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Chapter 2. “Aqueous Chemistry” (chemistry in water)
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Water & biochemistry.
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It has recently been discovered that bacteria can live (and grow) several kilometers underground trapped within rock pores, with no no biogenic carbon, no sunlight, no mixing with the environment of earth's surface ( but there is water ). Surviving in Varied Environments
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The human body is about 60% by weight water. Earliest known vertebrate, 550 million years ago. It lived in water.
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The overall charge of water is zero, but the O atom has partial negative charge (due to being more electronegative) and H atoms have partial + charge. Water is “ polar ” (non-uniform charge distribution, can form H-bonds). Not linear, bond angle is about 105 degrees. Compare with CO 2 (linear molecule) and CH 4 (tetrahedral).
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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 the definition of hydrogen bonds ? (an attractive force between a H atom that is bonded to either O, N or F and another electronegative atom, such as O, N, or F)
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van der Waals radii
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A snapshot of liquid water, from water wiki. Hydrogen bonds between molecules of liquid water break and reform frequently. Molecules of liquid water continuously change their neighbors.
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Hydrogen bonds - strong enough to be useful, yet weak enough to be easily formed and broken again.
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Notice that the 3 atoms that form the hydrogen bond are nearly along the same line (H-bonds are usually within about 15 degrees of being linear).
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This note was uploaded on 08/26/2010 for the course CH 369 taught by Professor Kbrowning during the Spring '07 term at University of Texas at Austin.

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ch369_sum10_class2_notes - C h a p t e r 2 . A q u e o u s...

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