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Van Der Waals Attractions: Hydrogen "Bonds" - A Special Type of Attraction
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Van Der Waals Attractions:</strong> Hydrogen "Bonds" - A Special Type of Attraction</font>
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<td><img src="chargeMainIdea.png" width="98" height="58"></td>
<td><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></td>
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<img src="water_surface2Comp.png" width="365" height="201">
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">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 src="play.gif" height="12" 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 name="Submit2" script="script:mw:1:select atom all; heat -0.2; select atom none;" type="submit" value="Cool">
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show hydrogen bonds
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show partial charges
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slow motion
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<strong><font size="4" face="Arial, Helvetica, sans-serif">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.</font></strong>
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