UTF-8Phase Change: Evaporative Cooling2402332071org.concord.modeler.text.LineIcon750.060101015<html>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="7" color="#FFFFFF"><strong>Evaporation</strong>
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<font color="#a65d2c" size="5" face="Verdana, Arial, Helvetica, sans-serif"><strong>Putting It All Together</strong></font>
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In this model you will vary the strength of force between the molecules
and observe the effect on the rate of evaporation. Notice the labeled
scale corresponding to the strength of the intermolecular force. Heat or
cool the substance as you wish. Make note of how the temperature changes
as the model runs.
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false1org.concord.mw2d.activity.AtomContainerexperiment$0.mmlfalsefalseorg.concord.modeler.PageBarGraphChannel 0Temperature (*C)110true0.0625100200true510true-1-1000000.0100.00.01org.concord.modeler.PageButtonRunRun the simulation.7428Raised Bevelorg.concord.mw2d.models.MolecularModel0Execute MW scriptorg.concord.modeler.PageButtonStopStop the simulation.7728Raised Bevelorg.concord.mw2d.models.MolecularModel0Execute MW scriptorg.concord.modeler.PageButtonResetReset the simulation.8228Raised Bevelorg.concord.mw2d.models.MolecularModel0Execute MW scriptorg.concord.modeler.PageButtonHeat9728Raised Bevelorg.concord.mw2d.models.MolecularModel0Heat the system up0.01org.concord.modeler.PageButtonCoolRaised Bevelorg.concord.mw2d.models.MolecularModel0Cool the system down-0.01org.concord.modeler.PageButtonRemove the cover. Let it evaporate.Remove the cover and start the evaporation process.23928Raised Bevelorg.concord.mw2d.models.MolecularModel0Execute MW scriptorg.concord.modeler.PageCheckBoxShow interactionsorg.concord.mw2d.models.MolecularModel0Show van der Waals interactions11org.concord.modeler.PageSliderorg.concord.mw2d.models.MolecularModel00.0532000008970499040.0099999997764825820.2000000029802322450Intermolecular Force Increasing --->60060falsetrue{value="0.20140000339597464", label="Hydrogen Bonding"}{value="0.09880000166594982", label="Dipole-Dipole"}{value="0.01140000019222498", label="London Dispersion"}Element Ws: Epsilon11org.concord.modeler.PageTextBox750.030.0<html>
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<font color="#a65d2c" size="5" face="Verdana, Arial, Helvetica, sans-serif"><strong>The Final Experiment</strong></font>
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Record the number of molecules that evaporate in one minute (real time)
for each of the three settings in the model above for the same initial temperature. First, adjust the
slider to one of the forces, hit Run, and then heat or cool the system to
50*C <strong>before</strong> you remove the cover. Begin timing when the cover is removed. Also record the final
temperature of the system after one minute. Reset the system after each
trial.
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>Record and
label your data in the space below.</strong></font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>Based on your
findings and in complete sentences, list the intermolecular forces from
strongest to weakest. What is the relationship between rate of evaporation
and intermolecular force?</strong></font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>Explain why the
temperature changes as a liquid evaporates.</strong></font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><b>Congratulations!</b> You have reached the end of this Molecular Workbench simulation. Please create a report using the button below and either submit it electronically or on paper as per your instructor's directions.</font></td>
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-15235a140.01org.concord.modeler.ActivityButtonCreate a reportEvaporationgas.cml, liquid.cml, forces.cml, vdw.cml, strength.cml, LD.cml, hbonding.cml, experiment.cmlRaised BevelCreate a report for a page group in a new window11org.concord.modeler.PageTextBox750.032.0<html>
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