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Van Der Waals: Hydrogen Bonds
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Van Der Waals Attractions:</strong> Hydrogen Bonds</font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">Biologists
often talk about "hydrogen bonds" and their role in biologically active
molecules. It is important to realize that a "hydrogen bond" is really
just another polar attraction between molecules. It is not a covalent
bond. Often hydrogen is one of the atoms that gets partially charged, so
it is common to call the attraction of hydrogen on one molecule for the
negative part of another molecule a hydrogen bond.</font>
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<strong><font size="5" face="Verdana, Arial, Helvetica, sans-serif" color="#A86938">Hydrogen
"Bonds": A Special Form of Dipole-Dipole Attraction</font></strong>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">Water,
one of the most important molecules for life's existence, is a polar
molecule. So, water molecules attract to each other using the
dipole-dipole van der Waals attraction. Whenever the partially
positive hydrogen from one molecule is attracted to the partially
negative part of another molecule, we use the term "hydrogen bond"
to designate this somewhat stronger type of dipole-dipole
attraction. </font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">To the
right is a model of gaseous water (<em>i.e.</em> water vapor). To
see the affect the hydrogen bonds have on water, run the model ( <img height="12" src="play.gif" width="7">
) and experiment with the controls below. Then <strong>take a
snapshot of the model and annotate your image so that you indicate
where you see at least one hydrogen bond</strong> in the model. </font>
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  <input type="submit" value="Cool" script="script:mw:1:select atom all; heat -0.2; select atom none;" name="Submit2">
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show hydrogen bonds
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show charge
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<html><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><strong>While not possible, imagine that water molecules had no attraction for each other at all. Would you most likely find water as a solid, liquid, or gas? Explain your reasoning.</strong></font>
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