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Chemical Bonds: Simplified surface view of a molecule.
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Chemical Bonds:</strong> Simplified surface view of a molecule.</font>
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<td><img src="atomMainIdea.png" width="98" height="58"></td>
<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Different kinds of atoms are better than others at attracting electrons to themselves once they have bonded with another atom. How can we represent the degree to which atoms in a bond share electrons evenly?</font></td>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">This is
a view of the simplest two atom molecule. In the next few pages you
will explore the types of bonds that can form between two atoms. To
facilitate your understanding, a simplified view of the electrons
will be shown. </font>
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<img height="123" width="343" src="surfaceDiagramComp.png">
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<div align="center">
<img height="332" width="209" src="surfaceChargeComp.png">
<br>
<img height="1" width="1" src="unevenSharing.png">
<input selfscript="snapshot unevenSharing.png" value="snapshot" type="submit" name="button" id="button">
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<td>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">The
three main categories of bonds are formed when electrons are shared
in varying degrees between atoms.</font>
<ul>
<li>
<strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Non-polar
covalent</font></strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">:
completely equal or only slightly unequal sharing </font> </li>
<li>
<strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Polar
covalent</font></strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">:
somewhat unequal sharing </font> </li>
<li>
<strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Ionic</font></strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">:
so imbalanced that we don't really consider the electrons to be
shared, but instead they are thought of as transferred from one
atom to another</font> </li>
</ul>
<p><font face="Verdana, Arial, Helvetica, sans-serif" size="4">When
electrons are shared evenly, the entire surface of the molecule
shows no imbalance of charge. However, when electrons tend to be
found closer to one atom versus another, the surface of the molecule
near the atom with the better hold on the electrons becomes
relatively more negative than the surface near the other atom (which
becomes relatively positive).</font><br>
</p> <p>
<strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Electronegativity
is the term used to describe how well an atom attracts electrons
from another atom.</font></strong><font face="Verdana, Arial, Helvetica, sans-serif" size="4">
</font>
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<p class="firstp">
The picture of a molecule that is colored slightly red and blue
shows a bond between two atoms with one atom having a higher
electronegativity than the other.
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<p>
<font color="#660000"><strong>Use the snapshot button above to take a
picture of that molecule, and use the annotation tools ( <img src="textAnnotation.gif" height="15" width="16">
<img src="arrow.gif" height="14" width="15"> <img src="drawRect.gif" height="12" width="16">
) to indicate which side of the molecule is slightly negative and which
side is slightly positive.</strong> </font>
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<p class="question">
Place your annotated molecule here, showing which part is slightly
positive and which part is slightly negative:
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