Chapter 2 - substances in polymeric forms o can auto-ionize...

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Chapter 2 Properties of Water o high bp, mp, heat of vaporization, surface tension, and dielectric constant (can surround ions in dipole interaction) o bent structure (polar) o H-bond formation favors denser liquid than solid (avg. 2.3 bonds in liquid and 4 in solid) o good solvent for polar and ionic substances (b/c it creates hydration shells) o forms clathrate structure around non-polar solute molecule (decreases entropy b/c or order); non-polar molecules have a net attraction to one another b/c decrease in surface area = decrease in ordering of water o amphiphilic molecules form micelles in water o colligative properties: fp depression, bp elevation, vapor pressure decreasing, osmotic pressure effects (decreased by cells by storing
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Unformatted text preview: substances in polymeric forms) o can auto-ionize o pure water is 55.5 M • Buffers: solutions that tend to resist pH change; typically a weak acid and its conjugate base o intracellular: phosphate and histidine systems o extracellular: bicarbonate system o good buffers: pKa is in physiological pH range and not influenced by divalent cations • Water’s Role in Environmental Fitness o powerful solvent o medium for ionization o thermal properties create constancy in climate (allow for effective temp regulation in living systems) o high surface tension o osmotic pressures determine shape/form of living things...
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This note was uploaded on 02/09/2010 for the course BIOL 3361 taught by Professor Zhang/spiro during the Fall '08 term at Dallas.

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Chapter 2 - substances in polymeric forms o can auto-ionize...

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