This program is a life saver for any Chem or AP Chem student. While the periodic table is always a nice reference, it is the mass weight calculator and the equation balancer that are the real tools of this device. The mass calculator adds up the molar mass weight of an atom if you type in its formula. Since this is used in stoicheomotry, molarity, molality, gas laws, nuclear chemistry, and almost any other calculated problem or lab you can think if, it comes in handy. All of the atomic masses are accurate to the tables in chemistry books I have seen, and the results are very accurate! The equation balancer also comes in handy for double-checking work or for those pesky combustion equations with huge coefficients of CO2 or H2O. Overall this is a great program for doing homework or taking tests, and it can save a real lot of time!