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Gas Laws: Can You Explain This?
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Gas Laws:</strong> Can You Explain This? </font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">A careful scientist looks at something as complex as the Gas Laws by looking at a single variable and seeing how other variables influence it. In the experiments with the model gas you should have been able to see how volume depends on pressure, if you hold the number of molecules and the temperature constant. Similarly, you could figure out how volume depends on temperature if you hold the number of molecules and the pressure constant. These are just two of the experiments. So, let's return to real world experiments and see how understanding the gas behavior can explain what has happened in the pictures below. </font></td>
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<img src="balloon1.gif">
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<img src="balloon2.gif">
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<font size="6">❶</font> A flask containing very cold liquid
nitrogen is prepared to be poured on a balloon.
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<font size="6">❷</font> The liquid nitrogen is poured.
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<img src="balloon3.gif">
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<img src="balloon4.gif">
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<font size="6">❸</font> The balloon looks almost flat.
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<font size="6">❹</font> As the liquid nitrogen evaporates
the balloon re-inflates.
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<i><font size="2">Image credits: Ed O'Sullivan </font></i>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>Which
relationship of the following best explains this experiment?</strong></font>
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V-P relationship
T-V relationship
T-P relationship
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>Use your
understanding to explain why the balloon shrank and then expanded in this
experiment. </strong></font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>List two ways
you can increase the pressure in a container with a fixed volume and
explain why this causes a pressure increase. </strong></font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>SCUBA tanks
have to be built to withstand very high pressure because many gas
molecules are put inside them. Why would putting more molecules inside
cause high pressure?</strong></font>
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<p class="firstp" align="center"><strong>You have reached the end of the activity.<BR>Please submit a report.</strong></p>
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Gas laws
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