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Intermolecular Attractions: Introduction
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Two
atoms can bond to form a molecule in two ways:</font>
<ul>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">with
a non-polar covalent bond (when electrons are shared evenly) </font>
</li>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">with
a polar covalent bond (when there is an uneven sharing of the
electrons, causing the formation of a <a href="script:page:0:message partialCharge.html">partial
positive and partial negative</a> charge on the surface of the
molecule.) </font>
</li>
</ul>
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<a href="http://chemsite.lsrhs.net/FlashMedia/html/dipoleVsLondon.html"><img border="2" width="165" src="activateDipoles.gif" height="141">
</a>
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<div style="margin-left: 8px">
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">All
molecules have an attraction for other molecules via the
Coulomb force, the attractive force between positive and
negative charges. So, how do non-polar molecules form
attractions if there is no apparent surface charge? Click
the image to the left to see a more detailed explanation.</font>
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<img width="300" src="moleculeRepComp.png" height="304">
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intermol forces 1$0.mmlfalsefalse
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">All
molecules attract to each other, but there are different patterns
and strengths of attraction that occur. To the left is a bunch of
polar and non-polar molecules.</font>
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<img src="vdwPointerComp.png" height="100" width="102">
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<td colspan="2">
<strong><font size="4" face="Verdana, Arial, Helvetica, sans-serif">Explore
how different or similar molecules form intermolecular attractions
when they are close together. Then take a snapshot of the model, and
use the annotation tools (<img width="16" src="textAnnotation.gif" height="15"><img width="16" src="drawRect.gif" height="12"><img width="15" src="arrow.gif" height="14">)
to show where you see the attractions.</font></strong>
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<p class="question">
Image showing intermolecular attractions:
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<strong><font size="4" face="Arial, Helvetica, sans-serif">Which of the
following formed intermolecular attractions (check all that apply):</font></strong>
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+ ends of polar molecules to + ends of other polar molecules
+ ends of polar molecules to - ends of other polar molecules
- ends of polar molecules to - ends of other polar molecules
non-polar molecules to other non-polar molecules
non-polar molecules to + parts of polar molecules
non-polar molecules to - parts of polar molecules
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