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Atomic Forces and States
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Phase Change:</strong> Atomic Forces and States</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">The forces between atoms are key to understanding the states of matter and evaporation.</font></td>
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<img width="33" src="atomsBullet.png" height="23">
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<font size="4" color="#a65d2c" face="Verdana, Arial, Helvetica, sans-serif"><strong>How
does the strength of the force between atoms effect their state?</strong></font>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Use the
following model to explore this question. </font>
<p>
<b><font size="4" face="Verdana, Arial, Helvetica, sans-serif">Things to
know about the model:</font></b><font size="4" face="Verdana, Arial, Helvetica, sans-serif">
You can use the slider to change how strong the forces are between
atoms. The temperature of this model stays constant at 300K, about room
temperature.</font>
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Forces between atoms
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{value="0.15899999644607307", label="strong"}{value="0.08399999812245369", label="moderate"}{value="0.008999999798834325", label="weak"}
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Based on what
you observed in the model, choose the items in the list below that you
think have <b>weak</b> forces between atoms. Assume all these items are at
300K.</strong></font>
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Water
Wood
Iron
Air
Gold
Mercury
Carbon dioxide
Oxygen
Gasoline
Lead
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Based on what
you observed in the model above, choose the items in the list below that
you think have <b>strong</b> forces between atoms. Assume all these items
are at 300K.</strong></font>
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Water
Wood
Iron
Air
Gold
Mercury
Carbon dioxide
Oxygen
Gasoline
Lead
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">The state of
matter at a particular temperature depends on how strong the forces are
between particles. Substances with strong forces between atoms tend to be
solids at room temperature and will have high melting and boiling points.
Substances with weak forces tend to be gases at room temperature and will
have low melting and boiling points. Substances that are liquids at room
temperature have intermediate strength forces. </font>
<p>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Next page,
we will look at how the forces between atoms determines the strengths of
materials.</font>
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