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Van Der Waals: Dipole-Dipole Strength
227216237
Van Der Waals Attractions:
Strengthening Dipole-Dipole Attractions
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Dipole-dipole
attractions between polar molecules are not all the same. Some are
stronger than others. Below you will explore the relationship between
increased polarity and increased dipole-dipole attraction. </font>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Using the
model to the left you will explore these three different molecules with
three different attractive strengths.</font>
<p align="center">
<font size="4" face="Verdana, Arial, Helvetica, sans-serif"><img height="56" width="209" src="polarMoleculesComp.png">
</font>
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<p align="left">
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Select a
type of molecule to test from the menu below the model, press the "run"
button, and then use the arrow keys to pull on one of the molecules.</font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Which molecule
had the strongest attraction:</strong></font>
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the least polar molecule
the medium polarity moleucle
the most polar molecule
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Which molecule
had the weakest attraction:</strong></font>
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the least polar molecule
the medium polarity moleucle
the most polar molecule
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<html><strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Explain why polarity has an affect on the strength of attraction between molecules.</font> </strong>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">The molecules
used in the above model are shown in a simplified form. Below are three
actual molecules shown with their surface colored according to charge. </font>
<ul>
<li>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4" color="#990000">Pressing
the "translucent potential" button will show you the atoms of the
molecule.</font>
</li>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif" color="#990000">Drag
the mouse over a molecule to rotate it, or shift-drag to zoom. </font>
</li>
</ul>
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<font size="3" face="Verdana, Arial, Helvetica, sans-serif">electrostatic
potential</font>
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potential </font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Which substance
will have the highest boiling point:</strong></font>
</body>
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1-propanol
1,3-propandiol
1,2,3-propantriol
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<html><strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Explain your chlice for highest boiling point:</font> </strong>
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