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KEY CONCEPTS:
1) The ideal gas law
relates the pressure, volume, number of molecules, and temperature of an
ideal gas together.
2) The ideal gas law is an approximation
that only works for ideal gasses.
The ideal gas law is a combination of Charles's Law, which relates volumes
of gasses to temperatures, and Boyle's Law, which relates the pressure
and volume of gasses. To see how these relationships occur, go to:
http://phet.colorado.edu/sims/ideal-gas/gas-properties_en.jnlp.
Notice the pressure gauge and thermometer on the applet which give you
numerical values for the pressure and temperature of the inside of the
container. The number of molecules can also be measured quantitatively
because there is a counter for the number of particles on the right side of
the applet. Measurements for volume will need to be done qualitatively.
Put several molecules of gas into the box by pumping the pump a few times.
When the number of molecules is increased, what happens to the pressure?
Pressure increases
Pressure decreases
Pressure stays the same
When the number of molecules increases what happens to the volume?
Volume increases
Volume decreases
Volume stays the same
When the number of molecules increases, what happens to the temperature?
Temperature increases
Temperature decreases
Temperature stays the same
Now increase the volume by clicking on the handle on the left side of the
box and dragging it to the left. When the volume of the gas increases, what
happens to the number of molecules?
Number of molecules increases
Number of molecules decreases
Number of molecules stays the same
When the volume of the gas increases, what happens to the pressure?
Pressure increases
Pressure decreases
Pressure stays the same
When the volume of the gas increases, what happens to the temperature?
Temperature increases
Temperature decreases
Temperature stays the same
Now increase the temperature in the box by dragging the scroll bar labeled
heat control up and leaving it there for a short time. When the temperature
of the gas increases, what happens to the number of molecules?
Number of molecules increases
Number of molecules decreases
Number of molecules stays the same
When the temperature of the gas increases, what happens to the pressure?
Pressure increases
Pressure decreases
Pressure stays the same
When the temperature of the gas increases, what happens to the volume?
Volume increases
Volume decreases
Volume stays the same
How would your findings be different if you performed all of the tasks above
in a balloon instead of a rigid box?
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