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Hydrogen Bonds - that are sensitive to increases in...

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Hydrogen Bonds Electronegative atoms such as N, O, F, and Cl ( Fig. A. ) pull the distribution of electrons away from other less electronegative atoms bound to them through covalent bonds ( Fig. B. ). This creates slightly positive polar atoms which are attracted to the slightly negative unshared pairs of electrons found in N and O. This +-attraction forms the basis of hydrogen bonding ( Fig.C. ). Hydrogen bonds are weak bonds, ~1/20 of covalent bonds,
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Unformatted text preview: that are sensitive to increases in temperature. Hydrogen bonds have a strength of 4 kcal/mole in a vacuum and 1 kcal/mole in water. • The bond length between the hydrogen and the electronegative O or N to which it is covalently bound is about 0.1 nm ( Fig. D. ). The bond between the H and the O or N contributing the unshared pair of electrons is about 0.2 nm....
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