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Van Der Waals: Introduction
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Van Der Waals Attractions: Introduction
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">All molecules
attract to each other using forces called "van der Waals attractions".
These attractions are responsible for:</font>
<ul>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">The
temperatures at which many substances boil.</font>
</li>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">How your
DNA zips and unzips to reveal the code of life.</font>
</li>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">The
ability for your immune system to recognize and disable pathogens
instead of attacking your own cells and organs.</font>
</li>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">The
amazing climbing ability of Geckos.</font>
</li>
</ul>
<p>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">In this
activity you will explore how molecular level attractions are the
foundation of these phenomena and many other everyday experiences. </font>
</p>
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org.concord.modeler.text.LineIcon750.03010515<html><body align="center"><strong><font size="5" face="Verdana, Arial, Helvetica, sans-serif" color="rgb(051, 051, 051)">Types of Bonds and Polarity</font></strong></body></html>-553e61
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<td>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Two
atoms can be covalently bonded in two ways:</font>
<ul>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">with
non-polar covalent bonds (when electrons are shared evenly) </font>
</li>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">with
polar covalent bonds (when there is an uneven sharing of the
electrons) </font>
</li>
</ul>
<p>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif"><a href="introDetail.cml">Molecules
formed from all non-polar bonds are considered to be non-polar.
Molecules that have at least one polar bond are considered to be
polar.</a></font><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sup>*
</sup></font>
</p>
<p>
<font size="2" face="Verdana, Arial, Helvetica, sans-serif">*There
is one situation where the particular angles of multiple polar
covalent bonds in the same molecule causes the overall charge
summation to cancel, making molecules which fall into this
category overall non-polar.</font>
</p>
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<img height="270" width="300" src="moleculeRep.jpg">
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<font size="4"><strong><font face="Verdana, Arial, Helvetica, sans-serif">What is the difference between polar and non-polar molecules (and don't just talk about the colors used to represent them)?</font> </strong></font>
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org.concord.modeler.text.LineIcon750.03010515<html><body align="center"><strong><font size="5" face="Verdana, Arial, Helvetica, sans-serif" color="rgb(051, 051, 051)">Seeing van Der Waals Attractions</font></strong></body></html>-553e61
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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>
</td>
<td>
<img height="100" width="102" src="vdwPointerComp.png">
</td>
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<td colspan="2">
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Explore
how different or similar molecules form van der Waals attractions
when they are close together. Then answer the questions below.</font>
</td>
</tr>
</table>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Use the <strong>take
a snapshot</strong> button above to capture a picture of some van der
Waals attractions. A window will open with your snapshot and some
annotation tools. Use these tools to indicate where you see van der Waals
attractions in your image.</font>
<blockquote>
<p>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif"><img height="15" width="16" src="textAnnotation.gif">
  = add a text annotation<br></font><img height="12" width="16" src="drawRect.gif"><font size="4" face="Verdana, Arial, Helvetica, sans-serif"> =
draw a rectangle<br><img height="14" width="15" src="drawLine.gif"> =
draw a line </font>
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<strong><font size="4" face="Arial, Helvetica, sans-serif">Which of the
following formed van der Waals 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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