As you turn this little paper sculpture inside-out, it changes colors. First yellow, then blue, then red, then green, and then yellow again. You can keep turning it inside-out, cycling the colors, as long as you like.
http://sci-toys.com/scitoys/scitoys/mathematics/paper_ring.html
In this experiment, students will measure the pH of various solutions and then use their data to classify those substances as acids, bases, or neutral solutions.
http://www.pasco.com/experiments/biology/december_2001/home.html
To differentiate between homogeneous and heterogeneous mixtures. To familiarize yourself with various separation techniques
http://www.hsh.k12.nf.ca/chem/3202l/improvedchemlab.htm
Did you know that there are reasons you pick the people you date?
http://parentingteens.about.com/cs/homeworkhelp/l/blscpro16.htm
Learn about the Bernoulli effect by building an airfoil (airplane wing) and making it fly
http://www.tryscience.org/experiments/experiments_wingit_athome.html
Can you figure out the key to the keystone?
http://pbskids.org/zoom/activities/sci/arch.html
Can you walk on water? How 'bout air?
http://pbskids.org/zoom/activities/sci/ballooncolumns.html
Be glad you don't have to build it with your beak!
http://pbskids.org/zoom/activities/sci/birdsnests.html
Create a cash-carrying cargo cruiser!
http://pbskids.org/zoom/activities/sci/boatsafloat.html
A dam is a structure that stops a river from flowing. Can you build one out of popsicle sticks and small rocks?
http://pbskids.org/zoom/activities/sci/buildadam.html