UTF-8Phase Change: Latent Heat2402332071org.concord.modeler.text.LineIcon750.03010105<html>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Phase Change:</strong> Latent Heat</font>
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false11org.concord.modeler.text.LineIcon750.0110101015<html>
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<td><img src="atomMainIdea.png" width="98" height="58"></td>
<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Latent heat is an amount of energy a material absorbs or releases during phase transformation. It is called latent heat because it does not result in a change in temperature. For an isolated system, latent heat is usually associated with the rearrangement of atom positions in a phase transition.</font></td>
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<font size="5" color="#a65d2c" face="Verdana, Arial, Helvetica, sans-serif"><strong>From
crystal to liquid and then to gas</strong></font>
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false255 0 01org.concord.modeler.PageTextBox750.0100.0<html>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">The following
model shows a small hexagonal crystal. Press the "Starting adding heat"
button to begin the simulation and heat it up gradually. Watch the
simulation until it automatically stops. The two bar graphs in the middle
shows the kinetic energy (the red one) and the potential energy (the blue
one). The line graph on the right shows the temperature as a function of
the total energy of the system, which increases over time.</font>
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false1org.concord.mw2d.activity.AtomContainerpage7$0.mmlfalsefalseorg.concord.modeler.PageBarGraphKinetic Energy/ParticleKinetic energy55250true510true-1-1000000.01.02.7472337023937143E-5org.concord.modeler.PageBarGraphPotential Energy/ParticlePotential energy55250true510true-1-ffff010-1.00.0-0.7788481116294861org.concord.modeler.PageXYGraph0Total Energy/ParticleKinetic Energy/Particlefalse-0.80.3false0.04000.0220250Total energy (eV)Temperature (K)60050-1-1falsefalseLowered Etched1org.concord.modeler.PageCheckBoxKinetic Energy Shadingtrueorg.concord.mw2d.models.MolecularModel0K. E. Shadingorg.concord.modeler.PageButtonStart adding heatorg.concord.mw2d.models.MolecularModel0trueExecute MW scriptorg.concord.modeler.ActivityButtonTake a snapshot from the graphTake a snapshot from the graphScript1org.concord.modeler.ImageQuestion372250<html>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Please fill in
the snapshot of the line graph you have taken after the simulation stops:</strong></font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>What do you
think caused the line graph to stop rising in the middle of the simulation?</strong></font>
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