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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Van Der Waals Attractions:</strong> Comparing Dipole-Dipole to London Dispersion</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">There are two
categories of van der Waals attractions:</font>
<ul>
<li>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">Dipole-dipole
= the attractive force between polar molecules</font>
</li>
<li>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">London
dispersion = the attractive force between non-polar molecules </font>
</li>
</ul></td>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">There is a
weak attraction between all atoms and molecules called London dispersion.
Polar molecules additionally attract via dipole-dipole attractions.
Together, the London dispersion and dipole-dipole attraction are what we
call van der Waals attractions.</font>
<p>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">In the
previous model, time was standing still, so you could explore when van
der Waals attractions form. In this model the molecules will be allowed
to feel those attractions and move accordingly. Use the model below to
explore the differences in the strength of London dispersion and
dipole-dipole attractions for molecules of similar size.</font>
</p>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Separate the
molecules from each other by dragging the one attached to the green star.
The other molecule is fixed in place so it won't move. </font>
<ul>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">choose a
pair of molecules using the menu</font>
</li>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">use the
arrow keys to pull the star around (If the star doesn't move, click on
it.) </font>
</li>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">use the
"a" key to increase the pulling force and the "d" key to decrease it</font>
</li>
</ul>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>What is the
primary attraction between NON-POLAR molecules:</strong></font>
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true
London Dispersion attraction
Dipole-Dipole attraction
gravitational attraction
magnetic attraction
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>What is the
primary attraction between POLAR molecules:</strong></font>
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true
London Dispersion attraction
Dipole-Dipole attraction
gravitational attraction
magnetic attraction
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Which type of
van der Waals attraction is stronger:</strong></font>
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true
London Dispersion attraction
Dipole-Dipole attraction
gravitational attraction
magnetic attraction
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</font></a><font><a href="page3.cml"><img width="59" src="next.jpg" border="0" height="26">
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<img width="54" src="page.jpg" height="26">
<a href="index.cml"><font><img width="46" src="index.jpg" border="0" height="26">
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