Ideal Gas Law Apparatus
TD-8596A
8
012-08420B
Varying Temperature, Sample Data and Analysis
Percent Difference = 1%
Answers to Questions
1.
When the cylinder is compressed, the pressure momentarily spikes because the temperature of the gas increases. As
the temperature drops back down, the pressure decreases.
2.
The pressure does not return to its original value because volume has decreased while the molar quantity of gas
remains the same.
3.
When the pressure is released the temperature drops rapidly, then slowly returns to room temperature. The
temperature drops due to sudden decompression (which is essentially adiabatic). It returns to room temperature due to
heat flow from the environment into the syringe.
Experiment 1:
Teacher’s Notes—Ideal Gas Law Electronic Workbook
With the Capstone electronic workbook,
students will explore the relationship between
the volume, pressure and temperature of a gas.
They will compare graphs of V versus T⁄P for
two different quantities of gas, and use these
graphs to calculate the number of moles in both
cases.
Have your students open the Capstone file
“Ideal Gas Law.cap” and follow the on-screen
instructions. They will collect, graph and analyze
data within the electronic workbook.
To hand in their work, students can save a copy
of the file or print the workbook after they have
finished.
These sample data are from the file “EX-5527
Ideal Gas Law with data.cap”.
Volume (cc)
Pressure (kPa)
Temperature (K)
1
43.6
99.76
301.04
2
23.6
199.22
321.08
P
1
V
1
T
1
-------------
14.4 kPa•cc/K
=
P
2
V
2
T
2
-------------
14.6 kPa•cc/K
=
