Yeast Bubbles

In Room 1 we have done an experiment called yeast bubbles. I enjoyed observing the giant bubbles overflowing in the cup. I found it challenging to get the exact temperature.
                                                                
                                                                                                       Yeast Bubbles
Have you ever wondered what activates yeast? Yeast is actually alive. It just needs sugar and a warm spot.

Add in ½ teaspoon of yeast, 2 teaspoons of sugar and warm water( yeast like 37 degrees Celsius) into a cup. Label this cup #1. In another cup add in ½ teaspoon yeast and warm water. Label this cup #2.In the last cup add cold water and ½ teaspoon yeast. Label this cup #3. Place #1 and #2 in a warm spot. Place #3 in a cold spot with no sun. 


After 10 minutes, #1 will have big bubbles. #2 will have small bubbles. #3 will have no bubbles at all. The bubbles you see in #1 and #2 is carbon dioxide. When the yeast eats the sugar and produces more carbon dioxide. It also makes more yeast which makes more carbon dioxide. This is a chemical reaction. It is irreversible.