Mrs. Balling
 
 
 
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All this week we studied the diffusion of water (aka:osmosis) through a membrane.  As a model of this we used vinegar to dissolve the shell off of two eggs.  We then found that although the shell dissolved off of the eggs the eggs gained mass which indices that water entered the egg through the chorion.  We then placed one egg in corn syrup and the other in distilled water. The egg in corn syrup was in a hypertonic solution so water diffused out of the egg so it got smaller and lost mass; the egg in distilled water was in a hypotonic solution so water diffused into the cell, got larger and gained mass.

 
 
This week we will finish up the Reproduction unit by reviewing the process of sexual reproduction in plants...here's a hint: they do it in the dirt :)   and we will watch everyone's favorite video: "Life's Greatest Miracle"
If you miss it...or want to watch again...here's the link to the video segments:
http://www.pbs.org/wgbh/nova/miracle/program.html