Today’s Learning Goals

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Presentation transcript:

Today’s Learning Goals 1. A) Describe the process of diffusion. 1. B) Explain how osmosis occurs. 1. C) Compare and contrast osmosis and diffusion.

Diffusion Molecules – Building blocks of matter. Diffusion: The movement of molecules from an area of high to an area of low concentration. •Ex: Perfume Diffusing through a room. •Ex: Dye diffusing through water

Diffusion Notes Particles travel from areas where it’s crowded to areas where it’s less crowded. High concentration arrow low concentration High density arrow low density Diffusion happens within and between living cells. Passive Transport = Cells do not need to use energy for diffusion.

X x x x x X x x X x x x x x x x xxxx x x xxxx x X x x x x x x x x

What speeds up the rate of diffusion? Add heat Heat Energy- Causes molecules to vibrate

Diffusion Lab Date: 11/13/09 – Denture Cleanser Hypothesis: If, then form Observation: Quantitative/Qualitative Process: Circle one Diffusion or Osmosis Passive or Active Transport

What is a cell membrane? A thin envelope that surrounds a cell Lets things in & out. A membrane can be: Impermeable --- Substances cannot pass thru Permeable --- Substances can freely pass thru Semi-Permeable ---- Allows some substances

Osmosis Osmosis: The diffusion of water across a semi-permeable membrane. /0+"12334526+765&6525"&68',48'5"*89*:5"&6;'"<69*)1"<='"869",6+,'+<)*<26+> * In diffusions/osmosis, molecules always move toward a low concentration

Osmosis Notes Osmosis is the diffusion of water through a semipermeable membrane. Osmosis is important to cell functions. It also occurs in plant and animal cells Semipermeable means only certain substances can pass through Water is made up of particles called molecules. Ex: Red blood cells burst in pure water – particles move from outside (more dense) to inside (less dense). Cell would fill up and burst.

Osmosis What is the concentration of the water compared to that of the cell? A. Equal Concentrations B. Water is Low Concentration C. Water is High Concentration A B C

Diffusion/Osmosis Lab 11/16/09 – Tea Bag Hypothesis: If, then form Observation: Quantitative/Qualitative Process: Circle one Diffusion or Osmosis Passive or Active Transport

Other Labs on diffusion and osmosis 11/17/09 – Carrot 11/18/09 – Gobstoppers 11/19/09 – Gummy Bears