BIOL 1201 : Exam 1 Lecture 4

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azuremammoth471

15 Mar 2019

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*in any solution the product of the hydrogen ion concentration and hydroxide concentration has to be 1x10^-14. Readings: pgs 46-63 in campbell biology 9th ed. Biological importance: living cells are 70-95% water, solvent for biological reactions, 71% of the earth"s surface is covered by water. Hydrogen bonds b/w water molecules- produces cohesion. Solutions - a homogeneous mixture consisting of a solvent, and solute. Water is an excellent solvent for ionic (molecules with a charge) or polar (slight charges at each end of molecule) molecules (see figs. 3. 6 and 3. 7) water molecule attracted to polar regions on proteins. Concentration = mass (weight)/volume: in reactions, molecules combine by number, a mole of any compound possesses 6. 02 x 10^23 molecules, molarity (concentration) moles per liter of solution (mol/l) Mole (mol) - sum of the atomic weights (mass numbers) in daltons = grams. *calculating molarity - molar concentration (mol / l)

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