CAS BI 105 Lecture Notes - Lecture 3: Electric Field, Chemical Polarity, Hydrogen Bond
31 Oct 2018
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Document Summary
Some atoms likes o attract electrons more strongly than others (like h) - they have higher electronegativity. This leads to an unequal distribution of electric charge across the molecule: polar. In h2o, o has a higher en, making the shared e- closer to o2. This gives o atoms a partial negative (e-) and a partial positive for h atoms. H atom from a polar molecule is attracted to an electroneg atom of another polar molecule (or a distant atom in the same large molecule) Weak bonds that can form and break easily. They allow animals to walk on water. Not all biologically important molecules are polar. Lipids are made up almost entirely with similar electronegativities (c and h) molecules aren"t polar. Non polar: molecules are distributed equally with no charge. All contain aqueous solutions; water is always the solvent in us, molecules (solutes) are dissolved. Molecules that dissolve really well in water.
