Lecture 2 notes 9-10-07

Lecture 2 notes 9-10-07 - Lecture 2 (Kussel): 9-10-07 th...

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Lecture 2 (Kussel): 9-10-07 *Prin Bio I Tutorial Sundays in Palladium Multipurpose Room, 2 nd floor Office Hours 12-1pm MW, Brown 8 th floor room 856 Chemical properties of water Covalent bonds – strongest chem bond, electrons in outermost shell are shared. E sharing forms a molecule (ex hydrogen molecule, H 2 , and water molecule, H 2 O). Needs 4 e-s, can make 4 bonds. Needs 2, can make 2, etc. Stability - covelant bonds are v. stable (most stable chem bonds). - Energy req. to break a C-C bond is approx. 80 kcal/mol - Thermal energy is approx. 0.6 kcal/mol (energy the bond has to begin with?)** memorize - Based on whether any given collision can break a bond – energy to break this bond is over 100x the thermal energy. Geometry - Covalent bonds exhibit precise orientations. - Ex. 1: Methane, CH 4 , tetrahedral w/ angles of 109.5 o , gets H atoms as far appart as possible. - Ex. 2: Formaldehyde, C with a double bond to O and two single bonds to H, a planar geometry with angles of approx 120 degrees (pic in notebook)
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Lecture 2 notes 9-10-07 - Lecture 2 (Kussel): 9-10-07 th...

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