Chapter 1 Notes
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This 1 page Class Notes was uploaded by Ally Bradfield on Friday April 29, 2016. The Class Notes belongs to 1020 at Auburn University taught by Dr. Zanzot in Fall 2015. Since its upload, it has received 13 views. For similar materials see Principles of Biology in Biology at Auburn University.
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Date Created: 04/29/16
Water Polar covalent bonds -> hydrogen bonding (intermolecular): oxygen hogs electrons Covalent bonds: share pairs of electrons FOUR EMERGENT PROPERTIES OF WATER Cohesion of water molecules Moderation of temperature by water Ice floats Water is the solution (at least the solvent) CONCENTRATION AND MOLARITY Amounts of reagents are important Molecular weight = sum of atomic weights Sucrose: C12H22O11 MW = 12*C + 22*H + 11*O = 342 Da/molecule Avogadro’s number -> 6.02 x 10^23 -> 1 mole o Converts daltons to grams 342 grams of sucrose is 6.02 x 10^23 molecules Example: We want to make 5 L of a .2 M glucose solution We need to know how many g of glucose Glucose: C6H12O6 Step 1: Calculate the molecular weight Step 2: Dimensional analysis: multiply molecular weight in the numerator and moles in the denominator, then multiply by how many moles moles on numerator and liter on the bottom, then multiply by how many leters you want on the numerator and 1 on the denominator Step 3: Multiply and cancel terms ACIDS AND BASES Water is not all H2O Can dissociate into ions H20 -> H+ + OH- I molecule in 554 million typically In pure water @ 25C, [H+] = 10^-7 M Also, [OH-] = 10^-7 M Ions are more reactive than H2O THE PH SCALE pH = -log[H+]
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