• Bellwork:
• On bellwork write “Set-Up Egg
Lab Notes and Study for Cell
Quiz”
• Get goggles and aprons. Put
backpacks all the way under
your table.
Egg Lab
Essential
Question:
How do molecules move across the cell membrane?
Question Column Egg in Vinegar
Egg in Syrup
Egg in Water
L1 –
Prediction:
Prediction:
Prediction:
Hypothesis:
Hypothesis:
Hypothesis:
Observation:
Observation:
Observation:
Diagram:
Diagram:
Diagram:
• Notecard definitions due on
Friday.
• Set up “Cornell Notes”
Handout (the one you just
picked up on the front table)
exactly as you see in the
diagram to the right. Add color.
Rulers are in the Aggie Cabinet.
Page 33
L2 –
L3 –
Summary -
Cell Quiz! When done with the quiz,
draw the following data table on the
back of PG 33(Cornell Notes - Egg Lab):
Original Mass
VINEGAR
SYRUP
WATER
XXXXXXXXX
Final Mass
Difference in
Mass
XXXXXXXXX
Standard
PG 34
B.4B – Investigate and explain cellular processes,
including homeostasis, energy conversions,
transport of molecules, and synthesis of new
molecules
Essential Question
How do molecules move across the cell membrane?
Egg Lab
Prediction:
Hypothesis:
L2 –
Observation:
L3 –
Diagram:
Summary -
Egg in Syrup
Prediction:
Hypothesis:
Observation:
Diagram:
Egg in Water
Prediction:
Hypothesis:
Observation:
Diagram:
TOMORROW
L1 –
Egg in Vinegar
TODAY – Wait for it…..
Question Column
How do molecules move across the cell membrane?
TODAY – NOW
Essential Question:
Page 33
The shell that surrounded your egg was dissolved by soaking the
egg in vinegar for 24 hours. The vinegar dissolved the hard
calcium carbonate shell exposing the semi-permeable membrane
that surrounds the egg. This membrane is very similar to the
plasma membrane that surrounds all of our cells. The purpose of
this lab is to simulate osmosis across a plasma membrane.
Students will receive one egg per lab table.
Day 1 Procedure…
1. Using your hands, carefully remove your egg from the vinegar and use
the water bath to CAREFULLY remove the shell. Use a paper towel to
pat it dry.
2. On your Cornell notes, record your observations (firmness and overall
appearance) of your egg in the VINEGAR row. Draw a diagram.
3. Mass (weigh) your egg on a scale and record your results on your data
table. Enter the weight under the “Final Mass” for VINEGAR and the
“Original Mass” for SYRUP.
4. Using a marker, label the beaker with your period # and table letter.
Cover the egg with syrup until it begins to float.
5. Allow your egg to sit for 24 hours.
Egg Lab
Prediction:
Hypothesis:
L2 –
Observation:
L3 –
Diagram:
Summary -
Egg in Syrup
Prediction:
Hypothesis:
Observation:
Diagram:
Egg in Water
Prediction:
Hypothesis:
Observation:
Diagram:
TOMORROW
L1 –
Egg in Vinegar
TODAY – NOW
Question Column
How do molecules move across the cell membrane?
TODAY – DONE
Essential Question:
Page 33
Diffusion Notes
Why does food coloring spread out in water?
Every living thing lives in a liquid environment
that it needs to survive.
One of the most important functions of the cell
membrane is to regulate the movement of
dissolved molecules from the liquid on one side
of the membrane to the liquid on the other side.
The concentration is
the amount of a
substance dissolved
into water.
Kool-Aid
Beaker 1
Beaker 2
Beaker 3
In a solution,
particles are
constantly
moving.
They collide
with one
another and
tend to spread
out randomly.
Particles move from an area of high
concentration to an area of low
concentration.
This process is known as diffusion.
A concentration gradient is a difference
between two concentrations.
Diffusion is the movement of particles
down the concentration gradient.
When the
concentration of a
solute is the same
throughout a
system, the system
has reached
equilibrium.
When equilibrium is
reached, particles
do continue to move
across the
membrane.
Substances that diffuse across a membrane
do not require the cell to use energy.
If a substance is able to
diffuse across a
membrane, the
membrane is said to be
permeable to it.
If a substance cannot
diffuse across a
membrane, the
membrane is said to be
impermeable to it.
Selectively permeable means that some substances
can pass across while others cannot.
Biological membranes are selectively permeable.
• Start foldable if time…….