Set up fermentation experiment

In this activity, you will learn about the factors that cause fermentation.



Estimated time to complete: 30 minutes



Deshawn is conducting an experiment on fermentation. He prepared six bottles. This table shows what he puts in each bottle.



bottle 1 1 cup cold water, 1 packet yeast

bottle 2 1 cup cold water, 1 packet yeast, 2 spoons sugar

bottle 3 1 cup warm water, 1 packet yeast

bottle 4 1 cup warm water, 1 packet yeast, 2 tablespoons sugar

bottle 5 1 cup hot water, 1 packet yeast

bottle 6 1 cup hot water, 1 packet yeast, 2 spoons sugar

He rotated the bottles until the yeast dissolved and placed a balloon on the neck of each bottle. In 20 minutes, he will check and see what happened.





6 bottles have bubbles that are tightly closed at the mouth, the balloons are not inflated

Part A

What questions are being asked through this scientific investigation?



Part B

What are the dependent and independent variables in this experiment? How were external factors controlled in this experiment to ensure that the results only tested the dependent variable?



Part C

Based on what you know about fermentation, write down your predictions for this experiment.