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Light Me Up!
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<strong><font size="7" color="#FFFFFF" face="Verdana, Arial, Helvetica, sans-serif">LIGHT
ME UP!</font></strong><font size="7" color="#FFFFFF" face="Verdana, Arial, Helvetica, sans-serif">
</font>
<p>
<font size="7" color="#FFFFFF" face="Verdana, Arial, Helvetica, sans-serif">Do
all solutions conduct electricity?</font>
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<font size="7" color="#FFFFFF" face="Verdana, Arial, Helvetica, sans-serif">Page
1</font>
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<font size="6" face="Verdana">Electricity is the flow of electrons (e-).
Under certain conditions, electrons may flow through a solution. We say
the solution <i>conducts</i> electricity. In this activity, you will
explore what conditions must be present for this to occur.</font>
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1. Select all solutions from the following list you predict will conduct
electricity.
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<html>CaCl<sub>2</sub></html>
KI
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KCl
<html>C<sub>12</sub>H<sub>22</sub>O<sub>11</sub></html>
<html>H<sub>2</sub>O<sub>2</sub></html>
<html>C<sub>6</sub>H<sub>12</sub>O<sub>6</sub></html>
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2. Give your reasoning for your choices in the space provided.
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<font size="5" face="#DEFAULT" verdana="verdana">With a partner, collect
the solutions from your instructor. Place a couple of drops of each
solution in its own space on a plastic sheet. Take the conductivity
tester and place both leads in each pool and note whether the light
emitting diode or LED (it looks like a little light bulb) lights up. <strong><i>Thoroughly
rinse and carefully dry the conductivity tester between samples.</i></strong>
Record your results. </font>
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3. Select all solutions from the following list that did conduct
electricity.
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<html>CH<sub>3</sub>CH<sub>2</sub>OH</html>
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4. How did your results compare with your predictions?
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5. List all compounds that lit the LED and, by looking at the chemical
formulas, identify what these compounds have in common.
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6. List all compounds that did not light the LED. What do they have in
common?
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7. With your partner, develop a rule for determining whether a compound
will conduct electricity based on your results and bond type.
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