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Gas Laws: The Number-Volume Relationship
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Gas
Laws:</strong> The Number-Volume Relationship</font>
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In addition to the relationships between volume, pressure and
temperature, is there a relationship between the number of gas
particles and the volume?
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4" color="#a65d2c"><strong>What
is the volume a gas can occupy?</strong></font>
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<img height="6" width="18" src="rule.png">
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You will run a series of trials, one right after another, each time
changing the number of molecules of gas and observing how the volume is
affected. The model initially contains 120 molecules. The piston is not in
a fixed position; it can move so as to maintain a constant pressure. The
number on the piston shows the length of the gas chamber. Since this is a
two-dimensional model, what we are calling "volume" of the gas is really
the length of the chamber (in Å).
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<strong>Directions:</strong><br><br><font size="3">(1) Click Run. Observe
any changes in the volume of the chamber. Click Stop after letting the
model run for at least 30 seconds or until the piston just jiggles in the
same place.<br><br>(2) Record the average volume of the container (the
number inside the red rectangle) by writing it in the "120 molecules" box
below.<br><br>(3) Select the other five radio buttons ("100 molecules",
etc.) and repeat (1) and (2) for each trial. </font>
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120 molecules
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100 molecules
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80 molecules
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60 molecules
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40 molecules
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20 molecules
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Write down the numbers in the small red box for each case in the text
fields below:
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120 molecules
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100 molecules
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80 molecules
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60 molecules
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40 molecules
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20 molecules
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<b>According to your data, which of the four graphs on the wall represents
the relationship between the number of particles and volume of a gas (at
constant pressure and temperature)? </b>
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<html><font size=4>❶</html>
<html><font size=4>❷</html>
<html><font size=4>❸</html>
<html><font size=4>❹</html>
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<b>Which of the following best explains what occurred as the number of
particles decreased (check all that apply)? </b>
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The strength of collisions increased.
The strength of collisions decreased.
The rate of collisions increased.
The rate of collisions decreased.
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<img height="23" width="33" src="motionBullet.png">
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<td>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4" color="#a65d2c"><strong>Avogadro's
Law</strong></font>
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<td colspan="2">
<img height="6" width="18" src="rule.png">
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<p class="firstp">
The direct relationship between moles (number of molecules of a
substance) and volume of a gas is known as <b>Avogadro's Law</b>. It
explains why a bike tire expands when you pump air into it.
</p>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>In your own
words, describe the relationship between volume and number of molecules.</strong></font>
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