AimAim: How do Osmosis and : How do Osmosis and Diffusion compare?Diffusion compare?

DN: Explain the difference DN: Explain the difference between passive and active between passive and active

transport.transport.

HW: Page 199 #33-34HW: Page 199 #33-34

What is the diffusion of What is the diffusion of water called?water called?

OsmosisOsmosis

OSMOSISOSMOSIS

The movement of water from an The movement of water from an area of area of high concentrationhigh concentration to an to an area of area of lowlow concentration. concentration.

What is meant by What is meant by concentrationconcentration??

Distilled water100% pure water

Solvent: The liquid (ex. Water)

Solute: The solid added to the liquid (ex. Salt/sugar)

The amount of solute!

Concentration Differences:Concentration Differences:

1) A 90% salt solution vs. a 20% salt solution

Which solution has more salt particles?

Which solution has more water molecules?

2) A 60% salt solution vs. 80% salt solution?

Which container has a greater Which container has a greater concentration of water molecules?concentration of water molecules?

= Solute (salt) = Solvent (water)

Which container has a greater concentration of solute molecules?

In which direction is osmosis going In which direction is osmosis going to occur?to occur?

= Solute (sugar) = Solvent (water)

Selectively Permeable

Why does this happen?Why does this happen?

There is MORE WATER There is MORE WATER on the left side of the on the left side of the membrane so it moves membrane so it moves to the right side.to the right side.

Why are the water molecules Why are the water molecules diffusing to the left?diffusing to the left?

Water molecules are red

The water is moving The water is moving from an area of high to from an area of high to low! low!

Why does water go in and out Why does water go in and out of the cell?of the cell?

To maintain DYNAMIC EQUILIBRIUMIf solute is equal, then so is water amt., molecules still move back and forth!

What happens to an animal What happens to an animal cell if it is surrounded by a cell if it is surrounded by a

highhigh concentration of water? concentration of water?Water will enter the cell! Cell will swell and burst!

What happens to an animal What happens to an animal cell if it is surrounded by a cell if it is surrounded by a lowlow concentration of water? concentration of water?

The Cell will shrink!! Salt sucks!!!!

Will osmosis happen?Will osmosis happen?

Summary Questions

In which direction will In which direction will osmosis happen?osmosis happen?

How is osmosis a form of How is osmosis a form of passive transport?passive transport?

Osmosis is the movement of water from Osmosis is the movement of water from an area of high concentration to an an area of high concentration to an area of low concentration. area of low concentration. No ATP No ATP

neededneeded..