Experiments that kids can do :)  

Hydrophobicity Experiments

All Wet (Brought to you by wondernet)
Do all liquids dissolve in water? interactions of oil, corn syrup and alcohol with water
http://chemistry.org/portal/Chemistry?PID=wondernetdisplay.html&DOC=wondernet\activities\solutions\wet.html


Floating Fluids (Brought to you by wondernet)
Density acting on fluids like corn syrup, oil, alcohol and water. densities of these liquids and why they float.
http://www.chemistry.org/portal/Chemistry?PID=wondernetdisplay.html&DOC=wondernet\activities\sinkorfloat\fluids.html


Kevin Lehmann's Bad Chemistry webpage
-clarifies what is and what is not hydrophobicity.
http://www.princeton.edu/~lehmann/BadChemistry.html

Making Science Make Sense  
is a site by Bayer AG dedicated to making science fun for children 
links to main page with simple experiments demonstrating the principles of polymerization, crosslinking, chromatography, molds and jellies.  
http://www.bayerus.com/msms/fun/index.html
Sticky Icky (on polymerization)
Cool Colors (on chromatography)

Polymerization Experiments

Fabulous flubber (Brought to you by wondernet)
Rubbery fun with flubber made from glue and Borax. 
http://chemistry.org/portal/Chemistry?PID=wondernetdisplay.html&DOC=wondernet\activities\art\flubber.html

Goop to go (Brought to you by wondernet)
make your own polymers, 2 kinds of squishy polymers
http://www.chemistry.org/portal/Chemistry?PID=wondernetdisplay.html&DOC=wondernet\activities\polymers\goop.html  

Density Experiments 

http://library.thinkquest.org/2690/exper/exp25.htm

http://www.wnpt.net/edserv/NTTI/lessonplans/7-8_bubble.pdf
experiments on making Bubbles and properties of Boyle's law