How to Design My Science Project on How Yeast Food Creates Gas

Chemical reactions and changes of state can be witnessed in a variety of different natural events. If you are teaching a science class about these two basic scientific theories, you can make the lesson interactive by putting together an experiment demonstrating how yeast will react with water and sugar to form a gas. This will show your students that even though gas cannot be seen, it does have a mass and takes up space.

Instructions

1

Take the top off of an empty plastic water bottle.

2

Place a funnel into the top of the water bottle.

3

Pour 8 oz. of water into a pot, and heat the water over medium heat until it is just hot.

4

Pour the hot water into the bottle through the funnel.

5

Pour 1/4 cup of sugar into the water through the funnel.

6

Pour 1 package of active dry yeast into the bottle through the funnel.

7

Place the opening of a balloon over the top of the bottle, sealing off the top.

8

Shake the bottle well, and allow it to sit on a counter or table top for 30 minutes. The yeast will react with the hot water and sugar to create gas, which will be visible when the balloon inflates.