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Really smelly demonstration…..Put a few drops of
vanilla in a balloon
Shake the balloon, then wait about 30 seconds
Smell the outside of the balloon
What’s going on?EVIDENCE INFERENCEA drop of
vanilla was added to the inside of a
balloon and soon the aroma
could be detected on the outside of the
balloon.
Remember Diffusion?What is the definition of diffusion?
The movement of particles
From an area of high concentration
To an area of low concentration
Osmosis is a special kind of diffusion
WATER molecules move across a membrane
The movement is still from an area of high water concentration to an area of low water concentration
Meanwhile, back at the smelly balloon…….
EVIDENCE INFERENCE
A drop of vanilla was
added to the inside of a
balloon and soon the
aroma could be detected
on the outside of the
balloon.
Infer why the balloon smellsOsmosis made the “smell particles” move through the balloon membrane because they crashed into the inside of the balloon and accidentally fit through the tiny holes.
Shaker cube demo…
Start with all of the red and white beads on the same side.
Shake the cube a bit.
OBSERVE:Which beads, or
particles, fit through the holes?
INFER:Why won’t the red beads
move?
APPLY: Which color beads would
represent water molecules “doing” osmosis?
What would represent the cell membrane?
Picture this….You and your friend
are alone in a small boat in the middle of the ocean
There is no fresh drinking water
Your friend decides to just drink ocean water
You decide to just wait for some rainfall
Osmosis says…..85% water in the cells
lining the stomach75% water in ocean
waterWhich way will the
water molecules move?
Your friend loses & isEven more dehydrated
!
Picture this…You are snowboarding
at Powder Mountain.There are 20
centimeters of fresh, sparkling powder under you.
The day is sunny, but only -10o C that’s cold!
You forgot your chapstick…
Osmosis says…15% water in the air85% water in your lip
cells
Which way will the water molecules move?
Can you say chapped lips?
Quick Quiz Question 1
What will happen when a cell that is 75% water is placed into a beaker of salt water that is 65% water?
A. The cell will shrivel because water will move out of the cell
B. The cell will shrivel because salt will move out of the cell
C. The cell will plump because water will move into the cell
D. The cell will plump because salt will move into the cell
Quick Quiz Question 2
What is the difference between osmosis and diffusion?
A. In diffusion, particles move from high concentration to low concentration. In osmosis, particles move from low to high.
B. In osmosis, salt particles move across a membrane, making things swell. In diffusion, only water particles move.
C. Osmosis is a special type of diffusion where water moves across a membrane.