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Atoms and Energy: Page 4
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[Qian can the box in the graph be above the blue area so the kids can see what happens? Also can you create a snapshot button to take pictures of the graph. ]
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Atoms and Energy:</strong> The Potential and Kinetic Energy of Atoms</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 forces act on an atom to give it potential energy? </font></td>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">An interesting
thing happens when the two atoms get close together. The electrons in each
atom starts to notice the proton of the other atom. As a result, they
become attracted not only to its own proton, but to the proton of the
other atom as well. Now the protons in this scenario will still repel each
other, but they'll both be attracted to the negatively charged region that
lies between them. Now if you're really on the ball, you will see that the
atoms are faced with a number of different attractions and repulsions. And
the question that's posed is basically whether the attractions win out and
the whole thing holds together, or whether the repulsions win and the
atoms fly apart. In the model below, two atoms are placed at rest near
each other. (Of course, two atoms alone is a very rare thing). Not only
can we watch how the attractions affect the atoms, we can also explore
what happens to the energy of one of the atoms.</font>
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<img src="atomsBullet.png" height="23" width="33">
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<strong><font size="5" face="Verdana, Arial, Helvetica, sans-serif" color="#5d6b86">Create
a Potential Energy Curve</font></strong>
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<td colspan="2">
<img src="rule.png" height="6" width="18">
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">The model
below makes a graph of the potential energy of the pink atom. In this
model the green atom is nailed down and pink atom has to move in the blue
area.<br><br>Run the model. Use the tape controls to explore the
relationship between the model and the graph. <b>NOTE:</b> The X-axis of
the graph is the distance between the atom not time! The atom starts at
1nm and moves closer to the atom. Use the step controls to figure out this
graph.</font>
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org.concord.modeler.ImageQuestion372250<html>
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<font face="Verdana" size="4">Take a snapshot when the pink atom has the
lowest potential energy.</font>
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<font face="Verdana" size="4">Take a snapshot of the graph whe the pink
atom has the lowest potential energy.</font>
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org.concord.modeler.ImageQuestion372250<html>
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<font face="Verdana" size="4">Reset your model, move the pink atom to a
distance of 1.5 nm and then take a snapshot of the graph.</font>
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<body marginheight="5" marginwidth="5" bgcolor="rgb(230, 230, 230)">
<strong><font size="4" face="Arial, Helvetica, sans-serif">Compare the two
graphs and discuss the similarities and differences.</font></strong>
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