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Egg Lab CER
Critical Writing
*Warm Up*
In your journal…
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Pick up the paper at the front table.
Begin filling out.
Title page 54: Tonicity practice
Glue at the top of the page.
Water concentration
is highest in the
solution.
There is a lower
amount of solute in
the solution
compared to the
cell:
Hypotonic Solution
Because osmosis
is a type of
diffusion…water
will move from
areas of high
concentration to
low
concentration.
Remember HYPO
means LOW
Therefore, water will move
inside the cell.
Water concentration
is lowest in the
solution.
There is a higher
amount of solute in
the solution
compared to the
cell:
Hypertonic
Solution
Because osmosis
is a type of
diffusion…water
will move from
areas of high
concentration to
low
concentration.
Remember HYPER
means HIGH
Therefore, water will move
out of the cell.
Water concentration
is the same in the
solution as in the
cell.
There is an equal
amount of solute in
the solution
compared to the
cell:
Isotonic Solution
Because osmosis
is a type of
diffusion…water
will move from
areas of high
concentration to
low
concentration.
Remember ISO means
SAME or EQUAL
Therefore, water will move
back and forth across the
membrane at equal rates.
Tonicity Practice (pg 54)
• With your partner, write your question down on page 54.
• Draw a picture showing what is happening.
• Describe what type of solution is in the cell, and what type
of solution is surrounding the cell.
• Describe which way the water will move.
Egg Lab Day 1
Egg 1 mass: 80.5 g
Egg 2 mass: 85.8 g
Egg Lab day 2
Mass egg #1: 81.9g (distilled water egg)
Mass egg #2: 40.6 g (corn syrup egg)
What happened to the egg placed in distilled water?
What caused this change?
What happened to the egg placed in corn syrup? What
caused this change?
What kind of solution is distilled water?
What kind of solution is corn syrup?
Egg Lab day 2
Critical Writing
Needs to be in CER format.
Use the next few slides to help you write your CER.
Claim
__________________ is the process responsible for the change in
mass.
Eggs placed in a ___________________ solution will
__________________. Eggs placed in a ______________________
will ____________________________.
Evidence
The egg placed in distilled water…..(use your data to indicate the
changes in mass)
The egg placed in corn syrup…..(use your data to indicate the changes
in mass)
Reasoning
Osmosis is a type of _______________ transport and is the diffusion of
_______________. The egg is corn syrup was a _________________
solution causing the water to _______________ the egg resulting in a
decrease in mass. The egg is distilled water was a
__________________ solution causing the water to
_________________ the egg resulting in an ___________________ in
mass. Once equilibrium is reached, the water molecules
will……Movement of water across the membrane is going down the
____________________ gradient.