I did this experiment a couple years ago it was titled "Cookie - baking soda equals ?" It was really fun and really easy all i did was make one batch of cookies with baking soda and one with out. I recorded the difference in each one and I was done!
egg expiriment
One great science fair project involving chemistry for 8th grade is how to create salt flats.
you can show how static electricity can move a tin can like a Pepsi can
see how string length affects overall spin time
go on google and type in science fair projects its that simple
Science projects
science buddies,free science fair projects, or just google it
Nose it all.
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A fair with the emphasis on scientific projects.
i think that on a science fair they are identifying the people who helped you and how they helped you
Good science fair projects could fall under a number of categories, including environmental science, astronomy, chemistry, and cooking/food science. For example, you could look at how light intensity from stars changes with distance.