Introduction- Lesson
- Review & Tasks
Following successful completion of this lesson, students will be able to:
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All of this touring has made you thirsty! The bus driver is pulling into a gas station and you will have the opportunity to enjoy your favorite cold beverage. You purchase a bottle of ice cold refreshment and notice that it looks just like colored water. There are no bubbles in the liquid until you unscrew the cap and with a hiss and a fizz, bubbles start forming and floating to the surface! Where do the bubbles come from? In this lesson, you will learn more about solutions and how they are formed.
Image courtesy of flickr user dieselbug2007. This image is protected by a Creative Commons Attribution-Noncommercial 2.0 Generic license.
Watch the video below and pay careful attention to the action of the bubbles in the soda. This is an example of gas in a solution of a liquid. Perhaps you have visited the Coca Cola plant in Atlanta or the bottling plant in Montgomery? Open in new window.
Density and Buoyancy: Experimenting with Club Soda downloaded from PBS LearningMedia, http://www.pbslearningmedia.org. Rights to use this asset expire on do not expire. View full attribution.
The bubbles in the video are actually carbon dioxide gas which was pumped into the soda before it was bottled. The cap is placed on the bottle under pressure and then sealed to keep the gas from escaping. When the cap is opened, the pressure is released and the gas comes out of solution and rises to the surface of the liquid forming a nice refreshing fizz. You may have noticed that warm sodas bubble more than cold sodas and if you shake the soda before opening it you can surprise your friends with a “soda bath.”
See what happens when the gas in the soda is released very quickly! Watch Outrageous Acts of Science: Epic Stunts (2:21) to see the original Mentos geyser guys and their Cola car. Isn’t science fun? Login with Username access_student and password access to view the video.
