Presentation2 - C-H, C-C bonds ~300-400 kJ//mol...

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Unformatted text preview: C-H, C-C bonds ~300-400 kJ//mol Non-covalent bonds 10-100 x weaker ** their weakness allows them to be continually broken and reformed in a dynamic molecular interplay that is life. Covalent and Non-Covalent Bond Energies Many molecules in a cell, like DNA and RNA carry a net electrical charge. Cells also have many charged ions Like Na + , Cl- , K + , Mg 2+ In vacuum: F = kq 1 q 2 /r 2 In solution F = kq 1 q 2 / r 2 = dielectric Polarizable Dipole can Be induced example of -stacking Types of Non-Covalent Interactions C O C O O H O H Cl Cl Cl Cl H 3 N CH 2 C O O Dipole Moment (D) 0.12 1.83 2.59 16.7 H 3 N CH 2 C NH O CH 2 C O O 28.6 Why is the dipole moment of carbon dioxide and 1,4-dichlorobenzene zero? The dipole moment expresses the magnitude of a molecules polarity. At physiological pH amino acids exists as their zwitterionic ion.amines are bases, carboxylic acids are acids amines are strong enough bases to deprotonate carboxylic acids. Large distance in charge separation hence large dipole moment....
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Presentation2 - C-H, C-C bonds ~300-400 kJ//mol...

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