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Cold Team
Cold Team
Hot Team
Hot Team
Initial Conditions:
Initial Conditions:
In a closed Erlenmeyer flask, determine the initial values for each of the following variables.
Justify any approximations you may have to make. Suggest how you might improve those approximations.
Sketch a diagram of the contents of the flask.
In a closed Erlenmeyer flask, determine the initial values for each of the following variables.
Justify any approximations you may have to make. Suggest how you might improve those approximations.
Sketch a diagram of the contents of the flask.
P1 =
T1 =
V1 =
n1 =
R1 =
P1 =
T1 =
V1 =
n1 =
R1 =
Temperature Change 1:
Temperature Change 1:
Place your closed flask in the ice bath, you may want to plunge the flask up and down in the ice bath to speed the cooling.
Once the readings have stabilized, record the pressure and temperature of the air in the flask.
P2 =
T2 =
V1 =
n1 =
R1 =
Place your closed flask in the hot water bath, you may want to plunge the flask up and down in the hot water bath to speed the heating.
Once the readings have stabilized, record the pressure and temperature of the air in the flask.
P2 =
T2 =
V1 =
n1 =
R1 =
Prediction #1: Open the Valve.
Prediction #1: Open the Valve.
If you were to open the valve, will air enter or exit the flask?
Provide a rationale for your answer.
RE-CLOSE THE VALVE while flask is at T2.
At T2, determine the new number of mols contained in the flask.
What changes would you make to your sketch?
P3 =
T2 =
V1 =
n2 =
R1 =
Closed Valve
Open Valve
Temperature Change #2
Temperature Change #2
Keep your flask CLOSED.
Using the values you have for the air in your flask, predict the pressure of gas when allowed to return to room temperature (25˚C).
Allow your flask to return to room temperature.
Discuss why your prediction and the actual value may differ.
Make any corrections to your sketch based on the new state of air within your flask.
P4 =
T3 =
V1 =
n2 =
R1 =
Keep your flask CLOSED.
Using the values you have for the air in your flask, predict the pressure of gas when allowed to return to room temperature (25˚C).
Allow your flask to return to room temperature.
Discuss why your prediction and the actual value may differ.
Make any corrections to your sketch based on the new state of air within your flask.
P4 =
T3 =
V1 =
n2 =
R1 =
Making the Connection
Making the Connection
Join with a team of the opposite temperature.
Connect your flasks as shown in the photo to the right.
Predict, when both valves are open, which direction will the air flow?
Determine the pressure in each of the flasks.
OPEN the valves
Compare the final pressure in the two flasks.
How did your sketch help with the prediction of the final pressures?
P4 =
T3 =
V(Cold + Hot) =
n(Cold + Hot) =
R1 =
Sample Problems:
Sample Problems:
Cylinder X has a volume V and contains 3.0 mol of an ideal gas. Cylinder Y has a volume 0.5V and contains 2.0 mol of the same gas.
The gases in X and Y are at the same temperature T. The containers are joined by a valve which is opened so that the temperatures do not change.
What is the change in pressure in X?
A sample of oxygen gas with a volume of 3.0m3 is at 100°C. The gas is heated so that it expands at a constant pressure to a final volume of 6.0m3. What is the final temperature of the gas?
A. 750°C
B. 470°C
C. 370 °C
D. 200°C
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