Name Period Date

SECTION 2.2 Datasheet

Investigate Fermentation

7.1.a

How can you tell if fermentation releases material?

MATERIALS: dry yeast, measuring spoons, small water bottle, warm sugar solution, balloon

PROCEDURE

1. Add 1/2 teaspoon of yeast to the empty water bottle.

2. Fill the bottle about three-quarters full with the sugar solution.

3. Place the balloon tightly around the mouth of the bottle.

4. Gently swirl the bottle to mix the yeast and sugar solution.

5. After 20 minutes, observe the balloon and record your observations.

WHAT DO YOU THINK?

1. What changes did you observe? What do you think is the source of energy that caused these changes?

2. What accounts for the change in the amount of gas inside the balloon?

CHALLENGE

Design an experiment to answer the following question. How might the temperature of the sugar solution affect the process?

ANSWER KEY

What Do You Think?

1. The balloon filled up. Sugar is the energy source.

2. The yeast and sugar release gas that fills up the balloon.

Challenge

Students' experiments will vary. Students may determine that the temperature of the sugar solution might affect how much gas is produced per minute.

CALIFORNIA STANDARDS

7.1.a Students know cells function similarly in all living organisms.