Bell Work Find your quizzes from yesterday (put in notebook).

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Presentation transcript:

Bell Work Find your quizzes from yesterday (put in notebook). January 18, 2009 Bell Work Find your quizzes from yesterday (put in notebook). Take out your vocab.

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.

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

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

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

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

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Diffusion/Osmosis Lab