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BS111-Lecture 4 - Main Themes Lecture Three Water's...

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1 Main Themes Lecture Three Water’s essential properties H-bonding High Heat of evaporation High Heat capacity Aqueous Reactions Precipitation Acid-Base ( Buffers) Redox
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2 Molecules in living organisms: proteins, carbohydrates, lipids, nucleic acids Most are polymers of smaller molecules called monomers . Macromolecules : polymers with molecular weights >1000 Macromolecules Chapter 3
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3 Polymer Most are polymers of smaller molecules called monomers .
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4 Quantitative analysis 23 23 -1 mole =6.022 x 10 atoms. -1 mole Na weighs 23 grams (see periodic chart) 1 mole NaCl= 23g + 35g=58g or the MW of NaCl is 58g/mole (Daltons) So, 1 mole of NaCl has 6.022 x 10 NaCl molecules Macromolecules : polymers with molecular weights >1000
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5 I. Proteins General Structure of Amino Acids
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6 Zwitterionic form of amino acids Under normal cellular conditions amino acids are zwitterions (dipolar ions): Amino group = -NH
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7 Functional groups (R) : groups of atoms with specific chemical properties and consistent behavior; it confers those properties when attached to large molecules ( see fig. 3.1 Book).
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8 H-bonding
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9
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