UTF-8Activity Title: Page 42402332071org.concord.modeler.PageButtonRunrunbuttonRunorg.concord.mw2d.models.MolecularModel0Execute MW script111org.concord.modeler.text.LineIcon750.03010105<html>
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<strong>The Periodic Table:An Overview of the Elements </strong>
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false11org.concord.modeler.text.LineIcon750.085101015<html>
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The Chemistry of the Electronics Industry
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<img src="powerplant.gif" height="274" width="300">
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Many of our daily activities are dependent on the availability of
electricity. The use of electricity is about the conversion of
electric energy carried by electric current into other forms of
energy, such as light, heat and mechanical energy. How is the
production of electricity related to the discipline of chemistry?<br><br>The
basic structure of an atom, especially the outer or valence
electrons, determines the properties of an element. Elements to
the left of the staircase on the periodic table have fewer valence
electrons and have a tendency to lose those electrons. These
elements are classified as metals. In a solid metal, the electrons
are shared between the atoms and are free to move. This is what
makes metals good conductors.
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<img src="carbon atom.jpg" height="274" width="350">
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false1org.concord.modeler.PageTextArea400200<html>
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How does atomic structure contribute to an element's ability to conduct
electricity?
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falseLineorg.concord.modeler.PageTextArea400200<html>
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What type of elements are conductors and where are they located on the
periodic table?
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The model to the right represents solid copper. The individual copper
atoms are labeled. The gray spheres represent the "free" electrons which
move randomly.<br><br>In order for an electrical current to be produced,
an external electric field must be applied to the metal as the driving
force for electrons to travel. This external force is represented in
this model by the "Voltage" slider below the model. Reset the model and
answer the following questions.
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falseorg.concord.mw2d.activity.AtomContainerpage4$0.mmlfalseorg.concord.modeler.PageGaugeorg.concord.mw2d.models.MolecularModel0Channel 0Ammeter220340200true510true0.01.00.01org.concord.modeler.PageButtonRunfalseorg.concord.mw2d.models.MolecularModel0Execute MW scriptorg.concord.modeler.PageButtonStopstopbuttonstopfalseorg.concord.mw2d.models.MolecularModel0Execute MW scriptorg.concord.modeler.PageButtonResetresetbuttonresetfalseorg.concord.mw2d.models.MolecularModel0Execute MW scriptorg.concord.modeler.PageSliderorg.concord.mw2d.models.MolecularModel00.00.010.020VoltageChange the voltage across the wire20080falsetrue{value="10.0", label="Maximum"}{value="0.0", label="0"}Execute MW script1org.concord.modeler.PageTextArea400200<html>
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Using the "Voltage" slider, set the model at a high voltage and run.
Describe how the electrons move in comparison to the random movement seen
while running it without the external electric field.
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falseLineorg.concord.modeler.PageTextArea400200<html>
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Watch individual electrons. According to the model, how is the electrical
energy transferred?
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An electric current is defined as the number of electrons flowing
through a cross section of a wire, over a given amount of time.The
unit of electric current is the Ampere (A).
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<img src="plug.gif" height="89" width="100">
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<i><font size="3">How many electrons are involved? In a typical
household power cord, the number of electrons that flow in is around
10</font><sup><font size="2">18</font></sup><font size="3">
electrons per second. When humans feel an electric shock, at least 10</font><sup><font size="2">14</font></sup><font size="3">
electrons flow into their bodies instantaneously. </font></i>
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Insulators are substances that do not have free electrons and are
therefore not good conductors of electricity. Elements that fall
to the right of the elements depicted in purple on the periodic
table have outer levels that are almost full or are full. As a
result, nonmetals are more likely to gain electrons depending on
what they react with. Exceptions are the noble gases which are
generally unreactive due to their complete outer shells.
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<img src="periodic-table.gif">
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</table>
</center>
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<strong>You have reached the end of Part 1.<br><a href="script:page:0:message endPartOne.html">CLICK
HERE BEFORE REPORTING.</a></strong>
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-15235aorg.concord.modeler.ActivityButtonCreate a report of my work.Report Titlepage1.cml,page2.cml,page3.cml,page4.cml,page5.cml,page6.cml,page7.cml,page8.cml,page9.cml,page10.cml,page11.cml,page12.cml,page13.cml,page14.cml,page15.cml20640Create a report for a page group in a new windoworg.concord.modeler.text.LineIcon50.04455<html>
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