This is a fun activity to
combine with baking quick (any bread product that
has no yeast) and yeast breads. Take a slice of both
types of bread and ask your child, after looking at
it, where all the bumps and crannies come from since
the bread dough is smooth. Let them open the jar a
yeast to look at, smell, or drop some in their
hands.Materials: 1 tsp.
yeast
1 tsp. sugar
warm water
a drinking glass
Mix all ingredients, stirring once
gently, and observe over time what happens (maybe
1/2 to 1 hour). The yeast mixture will bubble and
grow, and then fall.
After performing the experiment,
ask the kids what they think caused the reaction.
Why did it grow and then fall? The yeast is a
single-celled fungi that consumed the sugar and gave
off a gas in return. The generation of gas caused
the growth. Once all the sugar was consumed, gas
production stopped and the mixture shrunk.
Contributed By WomanLinks.com |
