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Awesome Osmosis. 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?.

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Presentation Transcript
really smelly demonstration
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
What’s going on?

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.

EVIDENCE

INFERENCE

remember diffusion
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
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
guess which way the water will move
Guess which way the water will move…

75% water molecules

25% water molecules

correct a mundo
Correct-a-mundo!

50% Water Molecules

50% Water Molecules

meanwhile back at the smelly balloon
Meanwhile, back at the smelly balloon…….

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.

EVIDENCE

INFERENCE

infer why the balloon smells
Infer why the balloon smells

Osmosis 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.

notice that only the water molecules move
Notice that only the WATER molecules move

Salt doesn’t cross

Proteins don’t cross

shaker cube demo
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
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
Osmosis says…..
  • 85% water in the cells lining the stomach
  • 75% water in ocean water
  • Which way will the water molecules move?
  • Your friend loses & is
  • Even more dehydrated !
picture this1
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 says1
Osmosis says…
  • 15% water in the air
  • 85% water in your lip cells
  • Which way will the water molecules move?
  • Can you say chapped lips?
osmosis
Osmosis…

The movement of WATER molecules across a cell membrane.

quick quiz question 1
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?

  • The cell will shrivel because water will move out of the cell
  • The cell will shrivel because salt will move out of the cell
  • The cell will plump because water will move into the cell
  • The cell will plump because salt will move into the cell
quick quiz question 2
Quick Quiz Question 2

What is the difference between osmosis and diffusion?

  • In diffusion, particles move from high concentration to low concentration. In osmosis, particles move from low to high.
  • In osmosis, salt particles move across a membrane, making things swell. In diffusion, only water particles move.
  • Osmosis is a special type of diffusion where water moves across a membrane.
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