BICH 410 Lecture Notes - Lecture 3: Coordination Complex, Lone Pair, Bond Length

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3 Sep 2016
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Importance of water: biological molecules assume their shape and function in response to surrounding water. Water molecules dipole moment -> results in the bent structure due to the lone pair arrangement. This polar/dipole characteristic is essential for the formation of hydrogen bonds. Partial negatives and partial positives are assigned to atoms according to their electronegativity. The more electronegative atom will acquire the partial negative. *smaller the bond length the stronger the bond. The strongest hydrogen bonds have the donor atom and the acceptor atom 180 apart. Spheres of hydration break apart the ionic bonds of solids causing the solid to dissolve in the water. Entropy increases as salt dissolves in water - spontaneous reaction that is entropically driven - enthalpy-entropy compensation - less of bonds (less enthalpy), but increase in disorder of system. A non-polar substance does not readily dissolve in water - like hydrocarbons, lipids.

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