- In this lab you will observe the production of carbon dioxide by yeast.
MATERIALS NEEDED:
Soda bottle
Glass
1 teaspoon sugar
1/2 package powdered yeast
18 inches of aquarium tubing
Modeling clay
Limewater (See experiment LIMEWATER for instructions.)PROCEDURE:
Pour 1/2 package of yeast into the soda bottle.
Fill the bottle one-half full with warm water.
Add 1 teaspoon of sugar to the bottle.
Place your thumb over the bottle's mouth and shake the bottle vigorously to mix the contents.
Place one end of the aquarium tubing in the top part of the bottle.Use the clay to seal off the bottle and to hold the tubing in the bottle.Insert the free end of the tube into a glass that that is one-half full with limewater.Observe periodically for several days.RESULTS:
- There is some foaming at first in the soda bottle. Bubbles of gas flow out of the tube into the limewater. The limewater turns cloudy.
- Yeast contains tiny plants that use sugar and oxygen to produce energy. In the process of producing this energy, carbon dioxide is also formed. The cloudiness of the limewater is proof that the bubbles produced by the reaction is carbon dioxide. Limewater only turns cloudy when carbon dioxide gas is bubbled through it.
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- There is some foaming at first in the soda bottle. Bubbles of gas flow out of the tube into the limewater. The limewater turns cloudy.
A HUNGRY PLANT
INTRODUCTION: