Test One Class Notes

Test One Class Notes - TestOneClassNotes 21:18

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Test One Class Notes 21:18 In Chemistry we learned that ionic bonds were strong; in class you said they  were weak. Why? Because in biology things happen in water Equal sharing of electron pairs in a covalent bond. Nonpolar covalent bond Unequal sharing of electron pains in a covalent bond. Polar covalent bond 6.  Capillary action and Surface Tension 7.  Ionization Dissociation into acid (hyrdonium ion and base (hydroxide ion) Most aquatic animals are ectotherms (body temp set by the environment)  because of water’s ____________             -high heat capacity pH- a review Acids, Bases, and Salts Acids produce H+ ions HCL---H+ and Cl Bases produce hyroxide ion NaOH----Na+ and OH Salts produce neither NaCl---- pH= log[1/H+]= -log[H+] actual activity of H+ rather than concentration log base 10
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the difference between pH 3 and pH4 is a 10 fold difference in the concentration  of H+  the difference between pH3 and pH 5 is a 100 fold difference in the concentration  of H+ pH of 7 is neutral pH below 7 is acidic pH above 7 is basic (a base) The pH of a solution decreases by 1 unit. The H+ concentration ____________.  –increases 10 fold Beginning with a solution of pH 8 you increase the H+ by a factor of 1,000 what is  the new pH of the solution?    -5 Beginning with a solution of pH 7, you decrease the [H+] by a factor of 100 what  is the new pH of the solution?  -9 Beginning with a solution of pOH 5 you increase the [OH-] by a factor of 1,000  what is the new pH of the solution?  -12 Buffers Substances that maintain a constant pH Solubility Solute- molecules that are dissolved Solvent- what they are dissolved in What determines solubility? Like dissolves like Like in terms of polarity Polar solutes dissolve in polar solvents Non-polar solutes dissolve in non-polar solvent
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Which atom is more electronegative? 1. Na 2. Cl Answer: Cl The covalent bond in H2 is polar. True or false? Answer: False Heat of Fusion- amount of heat that has to be removed to freeze 1g of water What is responsible for the unusual properties of water? Answer: Hydrogen bonding Biological molecules except for water, all are built on carbon skeleton Water Carbohydrates Lipids Proteins Nucleic acids Functional Groups
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Hydroxyl- alcohols Carbonyl- aldehydes (terminal carbon) and Ketones Carboxyl- acid group Amino- amines Sulfhydryl- Thiols Phosphate- organic phosphates Biological molecules Large molecules constructed from smaller molecules Polymers constructed from monomers subunits Mers=units Mono= single Poly= many Synthesis of polymers Condensation (dehydration) synthesis Proceeds with the removal of a water molecule
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This note was uploaded on 08/22/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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Test One Class Notes - TestOneClassNotes 21:18

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