If you are starting your students on chemistry, this is a great activity to teach balancing equations. High school students can use this to start stoichiometry.
This lab also shows the Law of Conservation of Mass. The amount of atoms (squares of construction paper) that you start with equals the amount that you end with.
You can add more chemical symbols to this to expand into more complex chemistry, or add organic chemistry symbols to expand into biochem!
IF YOU DO NOT WANT TO MAKE YOUR OWN CLASS SET, I can build them for you! Class set of 20 units (enough for 40 students in pairs), and includes extra colored squares and chemical symbols. All packed and ready to go out of the box. $60 + s&h.
Key Words: Chemistry, atoms, chemical equations, manipulative, stoichiometry, proportions, ratios, science, biochemistry