It think that the natural ph indicator & environmental chemistry is the best option .
If you are interesting in finding some great ideas for children's tree art projects, then the best website for you to check out would be Activity Village. They have some of the best ideas!
portable bathroom
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It is the combination of ideas in chemistry
Some creative melting bead ideas for crafting projects include making keychains, coasters, bookmarks, and 3D sculptures.
it is combination ideas in chemistry,
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.
How the heart works.
the taj mahal
you can do something to do with recycling or do a fundraiser.
There are lots of great ideas for community service projects for teenagers. Here is a list of ideas for you to consider. http://lancaster.unl.edu/4h/serviceideas.shtml
The chemistry projects suggestion depends upon student level, at school level the projects may be ,1- electroplating, 2-separation of compounds by column chromatography, 3-preparation of aspirine and other organic compounds.