Bio 112- chapter 3 lecture notes

Measure 180g glucose put 180g in beaker and add water

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Unformatted text preview: (e.g. glucose) Even large molecules such as proteins can dissolve in water if they have many ionic and polar regions Ionic and polar regions on the protein’s surface aaract water molecules. Lysozyme molecule (purple) in an aqueous environment Hydrophilic substance: affinity for water (NCl, glucose, some proteins) Hydrophobic substance: one that repels water (olive oil) Most biochemical reac<ons occur in water ConcentraTon: number of solute molecules dissolved in a unit volume of solution Molecular Mass: The sum of the atomic masses of all atoms in the molecule, usually in daltons 1 Mole (mol): Amount of a substance in grams equal to its atomic or molecular mass in daltons Molecular Mass of glucose (C6H12O6) : C=12 6 x12 = 72 daltons H=1 12 x 1 = 12 daltons O=16 6 x 16 = 96 daltons Total 180 daltons * Thus, 1 mole of glucose=180grams Molarity of a SoluTon: Number of moles of a solute dissolved in 1 L of soluPon (mole/L or M) 1 M glucose soluTons = 180g of glucose dissolved in enough water to make 1 L How do you make a 1 M glucose solu<on? measure 180g glucose. put 180g in beaker and add water well below the 1 L mark. Add water until glucose is completely dissolved then transfer to more accurate graduate cylinder. The add water to 1L mark. 1L 1L 180 g of glucose 1L 1L In a bea...
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This document was uploaded on 02/10/2014.

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