BIOL-L 112 Lecture Notes - Lecture 1: Alkalosis, Emergence, Olive Oil

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23 Jan 2018
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Water exists in the natural environment in all three physical states. All living organisms require water more than any other substance. Most cells are surrounded by water, and cells themselves are about 70-95% water. Water (h2o) is a highly polar molecule. Electronegativity: a chemical property that describes the ability of an atom to attract electrons towards itself. Shared electrons in covalent bonds are pulled towards oxygen. Net effect: oxygen has a partial negative charge while hydrogen has a partial positive charge. Why are there no numbers under group 18: because they have filled out their outer shell. Using the atomic symbol, which element is the most electronegative: f (fluorine) Is ammonia a nonpolar or polar molecule: n; polar. Is molecular oxygen a polar or nonpolar molecule: nonpolar. What is the maximum number of hydrogen bonds one molecule of water can form: 4 bonds. True or false, a partially negative charged oxygen atom must be present in a hydrogen bond: false.

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