This is a fun puzzle activity to segway into stoichiometry - includes molar mass calculations, mole-gram conversions, mole-molecule conversions, and balancing equations.
An excellent alternative to a boring worksheet! Students get 36 practice problems! Also works great as a partner activity - students love this!
I have three versions of the puzzle made - the first version is free, the other 2 versions are $2.50 - the questions are the same, but the code used for grading is different - more difficult for students to copy off one another.
This download includes instructions for the puzzle!