Name: _________________________________
Date: _________________
Period: ______
Barf Bag Lab
Alcoholic Fermentation
What happens during fermentation?
OBJECTIVE: Students will identify the reactants and products of alcoholic
fermentation and determine whether alcoholic fermentation is occurring by analyzing
the results of their barf bag lab.
** This lab will be run a little backwards! Since the reaction will need time to
work, we will follow the procedure, THEN fill out the background information! **
PROCEDURE:
1. Open your ziplock bag.
2. Add 2 tsp yeast to your ziplock bag.
3. Add ½ cup of cereal to your ziplock bag. (This may have already been done for you.)
4. Carefully add 1 cup of warm water to your ziplock bag. (You may need someone to hold the bag for
you so it doesn’t spill.)
5. Carefully compress all the air out of the ziplock bag and seal it closed.
6. Gently shake/squish the bag so that all of the contents mix.
7. Record observations about what the bag looks like to start.
8. Hide the bag from view (you can build a binder fort to do this) and let it rest for approximately 15
minutes.
9. After your teacher calls time, pull out your ziplock bag (keep it sealed!) and make observations and
draw conclusions about what has happened!
Mod A – Cells & Heredity (S/P)
Lesson 1.6 Page 17
Fry 2019
Name: _________________________________
BACKGROUND INFO:
-
Date: _________________
Period: ______
Please use your book or your notes to help you research the following information.
What is the EQUATION for CELLULAR RESPIRATION?
_______________________________________________________________________________________
-
Water
ATP (energy)
-
-
Circle the REACTANTS of the equation.
Carbon dioxide
Sunlight
Oxygen
Glucose (food)
Circle the PRODUCTS of the equation.
Water
ATP (energy)
Carbon dioxide
Sunlight
Oxygen
Glucose (food)
What would happen if an organism trying to respire had NO OXYGEN? Would the organisms still make ATP? (page 75)
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
What are YEAST and how do they obtain energy? What do they release as a WASTE PRODUCT? (page 75)
_______________________________________________________________________________________
_______________________________________________________________________________________
HYPOTHESIS: What do you think will happen to your “barf bag”? Consider the reactants and
what reaction may occur. What might it look like? How could you be sure of what is occurring?
__________________________________________________________________________
__________________________________________________________________________
__________________________________________________________________________
VARIABLE: Half the class will be using one type of cereal, and half the class will have another
type of cereal. How do you think the cereal type could affect this experiment?
Think about what the differences are between the two cereals!
__________________________________________________________________________
__________________________________________________________________________
__________________________________________________________________________
Mod A – Cells & Heredity (S/P)
Lesson 1.6 Page 18
Fry 2019
Name: _________________________________
Date: _________________
Period: ______
OBSERVATIONS: Conduct observations before and after the reaction. Compare and contrast what
it looked like at the beginning versus the end of the experiment. Also compare the two types of
cereal and how they reacted.
DATA TABLE 1
Cereal Type:
______________________________
DATA TABLE 2
Cereal Type:
______________________________
Observations BEFORE reaction
Observations BEFORE reaction
Observations AFTER reaction
Observations AFTER reaction
Mod A – Cells & Heredity (S/P)
Lesson 1.6 Page 19
Fry 2019
Name: _________________________________
Date: _________________
Period: ______
ANALYSIS:
Describe what has happened to the ziplock bag.
_____________________________________________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
If the air was squeezed out of the bag before the reaction, what is the bag filled with now? How do you
know what it is?
_____________________________________________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
Summarize what has happened in this experiment using knowledge from Unit 1 lesson 6
below. Please use the vocabulary words below in your summary!
Yeast
Alcoholic
Fermentation
Reactants
Products
Anaerobic
Cellular
Respiration
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
Mod A – Cells & Heredity (S/P)
Lesson 1.6 Page 20
Fry 2019
Name: _________________________________
Date: _________________
Period: ______
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
Mod A – Cells & Heredity (S/P)
Lesson 1.6 Page 21
Fry 2019