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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Phase Change:</strong> Solids</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">What does a solid look like at the atomic scale?</font></td>
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<font size="5" color="#a65d2c" face="Verdana, Arial, Helvetica, sans-serif"><strong>Three
Solids</strong></font>
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Here are models of three solids. One is a solid of atoms, one is a
solid of water molecules (ice), and one is a mix of atoms and
molecules. Run the models and watch them carefully.
</p>
<p>
<br>
The forces between atoms are shown by dashed lines.
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<img src="audience_sm.gif">
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Helium
A gas of atoms
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Ice
Water as a solid
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Mix
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Show Forces
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Stop the helium
model and estimate how many dashed lines there are per atom. (It is hard
to see all the lines. You can assume there is one between every pair that
are close.)</strong></font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>What is similar
about the arrangement of all solid atoms and molecules?</strong></font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Where have the
atoms traveled? As each model runs, follow one particle for a time. Repeat
for different particles. Describe the motion of atoms and molecules in a
solid. </strong></font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>How can you
identify atoms in a model that are part of a solid?</strong></font>
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