BIOL 1000 Lecture Notes - Lecture 3: Aqueous Solution, Blood Plasma, Organic Compound
13 May 2017
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Document Summary
Solution = a liquid consisting of a uniform mixture of 2 or more substances . Aqueous solution = solution with water as the solvent . The chemistry of life is sensitive to acidic and basic environments. When water molecules break apart they form hydrogen ions (h+) and hydroxide ions (oh-) o. Acid = a compound that donates hydrogen ions to solutions . Each unit increase represents a 10 fold change in concentration of h+ in a solution ph of 7 is neutral (equal amounts of either ion) . Buffer = a substance that minimizes changes in ph . Accepts h+ when in excess and donates h+ when depleted. Life"s molecular diversity is based on the properties of carbon. Almost all molecules made by a cell are composed of carbon (and other elements) . Carbon atom has 4 electrons in valence shell, can make 4 covalent bonds with other atoms . Methane (ch4) is one of the simplest organic molecules .
