EGG-SPERIMENT
We are starting a new experiment today!
• When we look at eggs placed in vinegar…
• The vinegar produced gas bubbles  dissolved
egg shell
• All that we’re left with is a membrane!
EGG-SPERIMENT Prelab
1. What does the cell membrane do?
Controls what moves in and out of the cell
2. What are 2 vocabulary words you should
associate with the cell membrane?
Selectively permeable
Homeostasis
EGG-SPERIMENT
This experiment will let you see how
the cell membrane can be selectively
permeable to different solutions (corn
syrup, water) to maintain homeostasis!
EGG-SPERIMENT
Scientific Question:
How does the weight of the egg
change when it is placed in different
solutions (corn syrup, distilled water)?
HYPOTHESIS: (IF… THEN…)
1. If the egg is placed in water then….
2. If the egg is placed in corn syrup then…
Hypothesis: Three things could happen when the egg is in corn syrup or
distilled water:
- Weight increases
- Weight decreases
- Weight stays the same
What do you think is going to happen?
Weight decrease in corn syrup
Weight of the egg will increase in distilled water
Weight will stay the same in both corn syrup or water
Weight of the egg will increase in distilled water
EGG-SPERIMENT
DO NOT WRITE YET!!
Listen to what you’ll be doing…
Variables and Procedures
1) Today we are going to take the
INITIAL weight of the egg BEFORE
we put it in any type of solution
EGG-SPERIMENT
DO NOTEGG-SPERIMENT
WRITE YET!!
Listen to what you’ll be doing…
Variables and Procedures
2) Today we are going to put our eggs
in different solutions:
- corn syrup
- distilled water
EGG-SPERIMENT
DO NOTEGG-SPERIMENT
WRITE YET!!
Listen to what you’ll be doing…
Variables and Procedures
3) Tomorrow we are going to take the
eggs out. We’re going to take the
FINAL weight in corn syrup and
distilled water.
EGG-SPERIMENT
DO NOTEGG-SPERIMENT
WRITE YET!!
Listen to what you’ll be doing…
Variables and Procedures
3) Tomorrow we are going to write a
lab report about what we did and
look at our results.
EGG-SPERIMENT
Cells
Action
DO NOT
WRITEin
YET!!
Listen to EGG-SPERIMENT
what you’ll be doing…
• Pay attention as we go over the details of
what we are going to be doing!
EGG-SPERIMENT
DO NOT
WRITE YET!!
EGG-SPERIMENT
Listen to what you’ll be doing…
SAFETY!!
Wear gloves
No horse play.
Please handle your eggs VERY GENTLY!
REMINDER… Headphones/electronics in lab =
0 on your lab report. You will have to make
up that grade in coach class.
NOW YOU MAY WRITE OUT YOUR
EGG-SPERIMENT
PROCEDURES
PROCEDURES
Summarize what was just explained to you.
SAFETY!!
How will you be safe in the lab?
1st Period DATA
Mass of Egg (Corn Syrup)
Group
Members
Names
1
2
3
4
5
6
7
8
INTIAL
FINAL
Mass of Egg (Distilled Water)
INITIAL
FINAL
Mass of Egg #3 (Air)
CONTROL!!!!!
INITIAL
FINAL
*Mrs. Doney
will do this.
Write the mass
she tells you
here:
*Mrs. Doney
will do this.
Write the
mass she tells
you here:
2nd Period DATA
Mass of Egg (Corn Syrup)
Group
Members
Names
1
2
3
4
5
6
7
8
INTIAL
FINAL
Mass of Egg (Distilled Water)
INITIAL
FINAL
Mass of Egg #3 (Air)
CONTROL!!!!!
INITIAL
FINAL
*Mrs. Doney
will do this.
Write the mass
she tells you
here:
*Mrs. Doney
will do this.
Write the
mass she tells
you here:
WHAT’S GOING ON?
To understand what’s going on in the eggsperiment, we have to learn about 3 types of
solutions and remember what we learned
about diffusion
EXIT SLIP
In this picture, the small black dots are the SOLUTE. The
SOLVENT is water. Assume that the cell membrane is
selectively permeable to WATER ONLY!
QUESTIONS:
1) Is there a greater amount of
solute inside the cell or outside
the cell?
2) Is there a greater amount of
solvent inside the cell or outside
the cell?
3) Will water move into the cell or out of the cell?
4) Will the cell shrink in mass, increase in mass, or have no
change in mass?
5) BONUS Is this cell in a hypertonic, hypotonic, or isotonic
type of solution?