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Gay-Lussac's law: The P-T relationship at constant volume
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The following model seeks to demonstrate the relationship between pressure and temperature on a gas. The following terms will be helpful:
Proportional - directly related to. As one variable increases, the other increases and vice versa.
Inversely Proportional - related to in inverse (opposite in nature). As one variable increases, the other decreases and vice versa.
(If this button doesn't turn gray when clicked, click it again.)
Instruction: In this activity, we will investigate the relationship between the pressure and the temperature for a gas in a compartment with a fixed size. On the left surface of the piston, a gauge is set to measure the pressure by counting the molecular impacts onto the surface. A measured data point will have a greater value if a molecule impacts the surface with a higher component of speed perpendicular to the surface. The piston is fixed so that the volume of the compartment remains constant.
Click the "Automatically heat the gas" button to start heating the gas gradually. A hourglass image will appear at the lower-right corner of the window, which indicates that a process is going on to heat up the gas. While the model is running, observe the graph on the right. When the hourglass image disappear, meaning that the heating process ends, the simulation will automatically stop. Right-click (Windows) or CTRL+click (Mac OS X) on the graph and select the "Take a Snapshot" item from the popup menu to record the graph. The snapshots you take will be included in the final report that you will generate at the end of this series of experiments.
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<b><font size="5" face="Trebuchet MS">Gay-Lussac's law: The P-T relationship at constant volume
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10. What does pressure result from?
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11. Identify the dependent variable from this example and justify how you
determined this. Provide a descriptive title for the graph
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12. Describe what happens to the pressure as temperature increases.
(Include at least two sets of data points from the completed graph to
support your description.) In terms of pressure, what happens at the
molecular level as temperature increases?
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13. How would you describe the relationship between temperature and
pressure of a gas?
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