Closed System Experiment

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by Mhuth39
Last updated 7 years ago


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Closed System Experiment


1) Our Question



2) Our Equipment

4) Procedure

3) My Prediction

Write your prediction about mass change--increase, decrease, or stay the same--for this demonstration in your journal, and explain your reason for your prediction.

How does the mass of starting substances compare to the mass of the ending substances, when gases are formed and given off?

What happened to the mass in this experiment? Why do you think this happened?What would happen to the mass if we took the lid off of the container? Why?Remove the lid and mass it to see if you were right!Click on the link below in your web browser to find out why this happens!

1) Fill one quarter of the container with water.2) Use the scale to mass the container of water, lid, and the unmixed Alka-Seltzer Tablet. Record the mass in your journal.3) Remove the items from the scale, and combine the Alka-Seltzer Tablet with the container of water, and quickly put the lid on it. Wait for the tablet to dissolve (about 2 minutes)4) When the tablet is no longer visible, use the scale to mass the container of water with the dissolved Alka-Seltzer tablet. Record the results.

5) Results

Record your answers in your journal

Water Container

Mass Scale

Alka-Seltzer Tablet


Jammin' tune for listening while you complete the experiment.

What will happen to the mass of the container once the tablet dissolves?

6) VideoWatch the video below to see if you did it correctly!


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