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Diffusion and Osmosis Mini-Lesson

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by

Kirby Francis

on 8 November 2013

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Transcript of Diffusion and Osmosis Mini-Lesson

Passive Transport
Passive transport is the movement of particles/molecules. And it does NOT require energy to happen.
Diffusion is a type of Passive Transport
Osmosis is a type of Diffusion.
Diffusion
Osmosis
Passive
Transport
No energy
used
Diffusion is the movement of molecules or particles
from an area of high concentration
High Concentration
(packed together tightly in one space)
to an area of low concentration
Low Concentration
(spread out)
through air,
through water, or
through a semi-permeable membrane.
This video showed the molecules moving from high concentration on the bottom to the area with low concentration on top.
Osmosis is the movement of WATER ONLY
The GOAL of passive transport (osmosis and diffusion),
is for the molecules to reach equilibrium
semi-permeable membrane
Example: H2O molecules through a cell!
Equilibrium = balance across an area
NOT at Equilibrium
AT Equilibrium
Example of Diffusion:
molecules reaching Equilibrium through water or air. The molecules are balanced across the area, they are equally spread out
Equilibrium happens through a semi-permeable membrane also.
For Diffusion the molecules want to be balanced on either side of the membrane.
For Osmosis the water molecules want to be balanced on either side of the membrane.
(NOT at Equilibrium)
(3 molecules will move to the right to reach Equilibrium)
(Equilibrium!)
Semi-Permeable Membrane
Semi-Permeable Membrane
Semi-Permeable Membrane
Equilibrium of water (Osmosis)
through a cell membrane.

Semi-permeable Cell Membrane
Water Molecule
NOT at
Equilibrium
3 outside
7 inside
NOT at
Equilibrium
8 outside
4 inside
To reach
Equilibrium, 2 water molecules will move out.
To reach
Equilibrium, 2 water molecules will move in.
Equilibrium
5 inside
5 outside
Equilibrium
6 inside
6 outside
Diffusion
Osmosis
Passive
Transport
No energy
used
Movement of particles/
molecules through air or through water,
or
Through a semi-permeable membrane
Movement of WATER ONLY
From an area of high concentration to an
area of low concentration
Diffusion
Osmosis
Passive
Transport
No energy
used
Movement of particles/
molecules through air or through water,
or
Through a semi-permeable membrane
Movement of WATER ONLY
From an area of high concentration to an
area of low concentration
Goal is to reach Equilibrium
The cell will INCREASE in size because molecules are going INSIDE of it.
The cell will DECREASE in size because molecules are LEAVING it.
Semi-permeable membrane = selective permeability
They mean the same thing.
They both mean a membrane that will let SOME things in and NOT let other things in.
CANNOT get in
CAN get in
Selective Permeability/Semi-permeable membrane
You must bring in your work sheet COMPLETED in order to take your test. This way I know you studied and watched this Prezi :D
THE END!
Examples of Diffusion
The scent particles are
spreading through air
The Kool Aid particles are
spreading through water
The semi-permeable membrane is a cell
CO2 molecules are moving through
Full transcript