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Experimental Verification of the Gas
Laws This
experiment will ask students to develop a series of mathematical
relationships based upon the behavior of gases under different conditions
(SCSCPS, p 37). |
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Introduction Purpose: The purpose of this experiment is to
measure changes in the pressure of gas when volume and temperature are
changed and then use this information to develop a mathematical relationship
between a change in volume and pressure and between a change in temperature
and pressure.. Hypothesis: You will need to predict what the
relationship what effect a change in volume or temperature will have on the
pressure of a gas. Background: . Include a paragraph or two on the
historical development of the gas laws and their relationship to modern
chemistry. |
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Materials
& Methods Materials: Air Equipment: Pressure guage (manometer) 125 mL
flask or 25 x 200 mm Thermometer 600 mL
beaker One hole rubber stopper Rubber/plastic
tubing tubing 20 mL
syringe Hot
plate/ stirrer Stirring bar Safety: Hot plates remain hot after being
turned off. Also, be careful that
tubing and other plastic ware does not touch hot plate. Pre-Lab Procedure 1. Examine
the lab procedure and prepare a flow chart for how you expect to conduct the
exercise. 2. Familiarize
yourself with the gas laws. Procedure: 1. In the
first experiment use the manometer (pressure sensing device) and a 20 mL syringe to examine the relationship between volume and
pressure. Obtain at least five data
points for your graph. Use this
information to verify the mathematical relationship between volume and
pressure. 2. In the
second experiment, us the flask, the rubber stopper, glass tubing and rubber
tubing to set up an experiment to investigate the relationship between
temperature and pressure. Adjust the
temperature of the flask using a water bath.
Use at least 5 data points to develop the relationship. Use the information to verify the
mathematical relationship between temperature and pressure. |
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Results & Conclusion Results: Plot each of your graphs in Excel or
some other spread sheet program. Discussion/Conclusions: In your discussion/conclusion section
of your report discuss specifically how the results relate to your
hypothesis. Compare the two experiments
and discuss how they differ and why.
Be sure to discuss potential sources of error in your experiment and
how the experiment might be improved or modified to obtain better results. |
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Questions 1. Is the
effect of temperature on the flask instantaneous? Explain. 2. If the
flask were at less than atmospheric pressure and heated, what changes in the
pressure would take place? 3. What
useful invention to Robert Boyle develop from his
work? 4. What do
you suppose would happen to a gas eventually if you kept increasing the
pressure? 5. On the
temperature versus pressure graph, what should be the intersection of the
graph with the x-axis? |
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