Click the mouse in the animation region to begin the experiment.

The diagram shows three inverted tubes (barometers) containing mercury. A sample of water, ethyl alcohol and diethyl ether will be injected into each barometer. It is OK to view the animation more than once, just click on the Repeat button.

Important do not press the enter key or the Return key while you are answering these questions. Your Browser will interpret either key the same as clicking the mouse on the Submit button. So BE CAREFUL!

Give me some responses to the questions below and I'll give you some extra credit.


Laboratory Section:

1. Before injecting the sample of water into the tube on the left, indicate what is present (or not present) in the region of the tube above the level of mercury (labeled with red circle containing the number 1.)

2. Carefully watch what is happening as the sample of water is injected into the bottom of the tube containing the mercury. Describe what you see happening. Look for the following; what happens to the first drops of liquid water as they rise to the top of the mercury column; what happens as more water reaches the top of the tube; what happens as the last bit of water reaches the top.

3. At this point describe what is in the region labeled 2 in the barometer.

4. What can you say about the vapor pressure of ethyl alcohol (ethanol) compare to water at the same temperature?

5. What happened to the liquid diethyl ether that was injected into the barometer? If we measured the height of the column of mercury in the barometer would that be the vapor pressure of diethyl ether?

6. What phase(s) must be present to be able to measure the vapor pressure of a substance in the liquid phase?

7. Is there anything about this animation that you feel you do not understand? List your concerns/questions.