Leavened bread vs. unleavened bread science experiment

In a very creative science experiment this morning; the children in the four-year-old class

learned first hand the difference between leavened and unleavened bread. Using a balloon, yeast, sugar, and warm water, the children observed that yeast releases a gas that makes dough rise when mixed with sugar and water. The balloon simulated the bread rising. Following the experiment the children sorted leavened and unleavened bread. In addition the children will be provided with an opportunity to make real matzah and bread.

Here is what you'll need for the experiment:

1 balloon

1 package yeast

1/4 cup sugar or honey

1 cup very warm water, plus extra for filling mixing bowl

1 liter sized plastic bottle

1 rubber band

Here is what you do:

1. Stretch the balloon by blowing it up and letting the air out a few times (like kneading the dough)

2.Stir the yeast, sugar or honey, and 1 cup warm water together and pour into the plastic bottle

3.PUt the ballon completely over the opening of the botte and secure with rubber band.

4.Fill a mixing bowl or pot halfway with warm water and place bottle inside.

5.The yeast will make the water in the bottle bubble and foam and watch, the gas will blow up the balloon.