Transcript egg lab osmosis-lab-procedure-1415

Warm-Up
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What types of substances need to move
into and out of cells?
What cellular organelle facilitates this
movement?
Show Us What You Can Do!
With a partner…grab a mini white board
(and a WB marker), and design an
illustration that explains active and passive
transport…you can’t use the picture that I
drew…but you can be creative and or
humorous 
 Be prepared to explain what makes your
illustration effective. You will do this with
another pair of illustrators.
 You should be prepared to offer and
accept constructive criticism.
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Lab: Cell Transport-Osmosis
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Pre-Lab Questions
Why is it necessary for materials to move into a
cell? What types of substances are these?
Why is it necessary for materials to move
out of a cell? What types of substances
are these?
What is the limiting factor that is the reason that
cells are not bigger than they are?
What is osmosis?
Some Important Pre-Lab Vocabulary
Hypertonic: the cell’s environment has
a higher concentration of solutes (stuff)
than inside the animal or plant cell.
 Hypotonic: the cell’s environment has a
lower concentration of solutes (stuff) than
inside the animal or plant cell.
 Isotonic: the cell’s environment has the
same concentration of solutes (stuff)
than inside the animal or plant cell.
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What You’ll Be Doing
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Over the course of the next several days, you will be
immersing an egg in various solutions.
Prior to each immersion, you will hypothesize as
to what will happen to the egg.
On each day that you perform this task, you will
make detailed quantitative and qualitative
observations about the egg. You will also record
qualitative observations regarding the solution
used.
For Example
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On day one you will immerse the egg in 5%
CH3COOH (Vinegar).
Your day 1 Hypothesis will be something like: I
think that if the egg is immersed in 5%
CH3COOH for one to two days, then …”.
You will record the circumference of the egg
using the string provided
You will record the mass of the egg using the
analytical balance.
You will record the color, texture, and any other
observable traits of the egg.
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You will record your observations
regarding the solution as well (clear, red,
cloudy, bubbles present, viscous (thick),
sweet smelling, etc.).
Osmosis Lab:
Materials
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1 Egg
White Vinegar (aka:
acetic acid or
ethanoic acid
or…CH3COOH)
Analytical Balance
Ruler (metric)
String
H2O (water)
7. Corn Syrup
8. Food Coloring
9. Plastic Cup
10. NaCl (salt)
*11. One liquid (safe) of
your choice
*If time permits
Procedure
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Obtain one egg and one plastic cup. Write your
name on a label and place it on the side of
cup!
Record your Day 1 hypothesis…you will be
placing the egg in vinegar. If….then...
Use the analytical balance to mass your egg to
the nearest 0.1 (1/10) gram.
Use the string and a metric ruler to measure
the circumference of your egg in centimeters to
the nearest 0.1 (1/10) cm.
Record any additional qualitative observations
about your egg (color, texture, markings, etc.)
6. Gently place your egg in the plastic cup
and carefully add the 5 % acetic acid
solution (vinegar) until your egg is
covered.
7. Observe for at least five (5) minutes and
record any additional observations.
8. Place your cup in the designated area
labeled with your class color.