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Intermolecular Attractions: Comparing Dipole-Dipole to London Dispersion
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">There
are two categories of intermolecular 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>
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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.<a href="script:page:0:message londonDisclaimer.html">*</a>
Polar molecules additionally attract via dipole-dipole attractions.
Together, the London dispersion and dipole-dipole attraction are what we
call intermolecular attractions.</font>
<p>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">In the
previous model, time was standing still, so you could explore when
intermolecular 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>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">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 face="Verdana, Arial, Helvetica, sans-serif" size="4">choose a
pair of molecules using the menu</font>
</li>
<li>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">use the
arrow keys to pull the star around (If the star doesn't move, click on
it.) </font>
</li>
<li>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">use the
"a" key to increase the pulling force and the "d" key to decrease it</font>
</li>
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<strong><font face="Arial, Helvetica, sans-serif" size="4">What is the
primary attraction between NON-POLAR molecules:</font></strong>
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London Dispersion attraction
dipole-dipole attraction
gravitational attraction
magnetic attraction
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<strong><font face="Arial, Helvetica, sans-serif" size="4">What is the
primary attraction between POLAR molecules:</font></strong>
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true
London Dispersion attraction
dipole-dipole attraction
gravitational attraction
magnetic attraction
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<strong><font face="Arial, Helvetica, sans-serif" size="4">Which type of
intermolecular attraction is strongest:</font></strong>
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London Dispersion attraction
dipole-dipole attraction
gravitational attraction
magnetic attraction
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