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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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<td><img src="motionMainIdea.png" width="98" height="58"></td>
<td>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 src="rule.png" width="18" height="6">
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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
effected. 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>Instruction:</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 is 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 trail. </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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<body face="verdana" bgcolor="rgb(230, 230, 230)" marginwidth="5" marginheight="5">
Which of the four graphs below best represents the relationship between
the number of particles and volume of a gas (at constant pressure and
temperature)?
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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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Which of the following best explains what occurred as the number of
particles decreased (check all that apply)?
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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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<font size="6">❶</font>
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<font size="6">❷</font>
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<img src="vn1.gif">
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<img src="vn2.gif">
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<font size="6">❸</font>
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<font size="6">❹</font>
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<img src="vn3.gif">
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The direct relationship between moles (number of molecules of a substance) and volume of a gas is known as <b>Avogadro's
Law</b>. This law explains why a bike tire expands when you pump air into
it.
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