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Investigating the gas laws
You will be using the following simulation to investigate the gas laws:
https://
ch301.cm.utexas.edu/simulations/js/idealgaslaw/
You can use this simulation to see what happens quantitatively in three different scenarios:
1.
The pressure law: keep volume constant, change temperature and measure pressure.
2.
Boyle’s law: keep temperature constant, change volume and measure pressure.
3.
Charles’ law: keep pressure constant, change temperature and measure volume.
The pressure law
Method:
1.
Click the lock next to volume: this will fi x the volume to 800 L or 0.8 m
3
.
2.
Record the temperature and pressure: this will be 325 K or 52
o
C and 1 atm or 101325 Pa.
3.
Cool the gas down and record the T and p.
4.
Repeat for at least fi ve pairs of values.
5.
Plot the data using your computer, add a line of best fi t and determine the equation of the line.
6.
What does this relationship show?
Boyle’s law
Method:
1.
Refresh the simulation: this will leave the temperature constant at 325 K or 52
o
C.
2.
Record the volume and pressure: this will be 800 L or 0.8 m
3
and 1.00 atm or 101325 Pa.
3.
Reduce the volume and record the V and p.
4.
Repeat for at least fi ve pairs of values.
5.
Plot the data using your computer, add a line of best fi t and determine the equation of the line.
6.
Replot the data to obtain a straight line.
7.
What does this relationship show?
Charles’ law
Method
1.
Refresh the simulation: this will leave the pressure at 1 atm or 101325 Pa.
2.
Record the temperature and volume: this will be 325 K or 52
o
C and 800 L or 0.8 m
3
.
3.
Increase the temperature of the gas and record the T and V.
4.
Repeat for at least fi ve pairs of values.
5.
Plot the data using your computer, add a line of best fi t and determine the equation of the line.
6.
What does this relationship show?
Print out the three graphs. They should be fully annotated with gradients, intercepts,
relationships and explanations.
