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F08-BCH361-L2

F08-BCH361-L2 - Water the solvent of life The three phases...

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Water - the solvent of life
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The three phases of water Water Gas phase water ice Melting point 0 o C Boiling point 100 o C
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Water is a polar molecule: it behaves as a dipole
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It has an extremely high boiling point of 100 o C due to the formation of hydrogen bonds
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Structure of Ice
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Anomalous behavior of water Density of ice 0.92 kg/l water at 0 o C 1.00 kg/l water has its highest density at 4 o C
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Water as a solvent: polar substances (as salts) are dissolved in water Hydrated ions
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H-bond formed in water Bonding of water to other molecules H-bonds in proteins and nucleic acids
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Hydrophobic substances increase the order of water molecules => unfavorable
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Formation of micelles
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The self-dissociation of water and the pH Scale Blackboard
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-----lemon juice ----sauerkraut, orange juice, wine ----tomato juice ----coffee ----milk ---- caustic soda ---- pure water ---- ammonia ---- Borax
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---Gastric Juice ----Urine ---------------Salvia ----Blood --------------Pancreatic Juice
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Acids and bases Acid: donates protons; increases the proton concentration in the solution HA H + + A - Base: accepts protons: decreases the proton concentration in the solution
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