UTF-8Heat and Temperature: Heat vs. Thermal Energy2412402461org.concord.modeler.text.LineIcon750.03010105<html>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Heat and Temperature:</strong> Heat defined</font>
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false11org.concord.modeler.text.LineIcon750.075101015<html>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4"> What is <b>heat</b>? Heat is internal energy that is transferred from one system to another due to a difference in temperature.</font></td>
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When you hold a cup of hot coffee, your hands warm up because internal
energy flows from the coffee to your hands. We call this flow of internal
energy <b>heat</b> (<a href="script:page:0:message <t><font face=Verdana><b>Clarification:</b><hr><font face=verdana>It is easy to be confused about heat and internal energy, which are not the same thing.<br>Heat is change of internal energy. When heat is added to a system its internal<br>energy increases. When heat is removed its internal energy decreases. Warmer objects<br>possess more internal energy, whereas colder objects possess less internal energy.<br><br></font></t>">note</a>).<br><br>The
following model shows that internal energy flows from a hot gas to a cold
solid. The bar graph on the left shows the internal energy of the solid,
and the one on the right shows that of the gas. Run the model for at least
a minute and observe what happens to the internal energies.
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false15.01org.concord.modeler.PageBarGraphChannel 0Internal energy of larger atoms2true0280250true36true-1000000.030.03.2698330879211426org.concord.mw2d.activity.AtomContainerpage5$0.mmlfalsefalseorg.concord.modeler.PageBarGraphChannel 1Internal energy of smaller atoms2true0280250true36true-1000000.030.00.70631843805313115.01org.concord.modeler.PageRadioButtonFewer atomsRun a model with fewer atomstruetrueorg.concord.mw2d.models.MolecularModel01203113016010Execute MW scriptorg.concord.modeler.PageRadioButtonMore atomsRun a model with more atoms.trueorg.concord.mw2d.models.MolecularModel01203113016010Execute MW scriptorg.concord.modeler.PageButtonRunRun the model and then remove the barrier.org.concord.mw2d.models.MolecularModel0trueExecute MW scriptorg.concord.modeler.PageButtonPausePause or stop the model.org.concord.mw2d.models.MolecularModel0trueExecute MW scriptorg.concord.modeler.PageButtonResetReset the model to its original state. org.concord.mw2d.models.MolecularModel0trueExecute MW scriptorg.concord.modeler.PageCheckBoxKE ShadingColor the atoms in proportion to their KEorg.concord.mw2d.models.MolecularModel0K. E. Shading5.01org.concord.modeler.PageTextBox750.0150.0<html>
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Things to think about:
<p>
1. How is energy transferred from the gas to the solid?<br>2. You can
add the two internal energies to get the total energy.<br>3. Is it
possible for the solid to end up with most of the internal energy?<br>4.
Are the KE values of the gas and solid different at the end of a long
run? Hint: Use the 'KE Shading' button to estimate the KE of the gas and
solid.
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false255 0 05.01org.concord.modeler.PageMultipleChoicetrue5372250<html>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>What happened
to the total internal energy of all the atoms when the model was run?</strong></font>
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trueIt increased.It decreased.It remained constant.It depends on the starting number of atoms.It went up and down.2-373738Lineorg.concord.modeler.PageMultipleChoicetrue5372250<html>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>When you run
this model, how is energy transferred from the gas to the solid?</strong></font>
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true<html>Through thermal diffusion.</html><html>By faster atoms hitting slower ones.</html><html>By atoms with more internal energy hitting ones with less.</html><html>By atoms with more KE hitting ones with less.</html><html>Both C and D.</html>3-373738Line5.011org.concord.modeler.PageTextBox750.026.0<html>
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