1) Lesson 8 - Physical and Chemical Changes http://www.saskschools.ca/curr_content/science9/chemistry/lesson8.html
2) Physical Vs. Chemical Changes - Interactive Lesson http://virtual.yosemite.cc.ca.us/lmaki/chem150-99/chapters/chapter1/lessons/phys_chem/phy_c_1.htm
3) Types of Chemical Reactions http://www.usoe.k12.ut.us/curr/science/sciber00/8th/matter/sciber/chemtype.htm
4) GEMS Alien Juice Bar http://sv.berkeley.edu/showcase/flash/juicebar.html