If the words shown above are replaced by the correct chemical formulae, it will result in an unbalanced equation, as shown here. Cu + O 2 → CuO Notice that there are unequal numbers of each type ...

formulae , most chemical equations are not correct. This is because the numbers of atoms of each element in the reactants may differ from those in the products .

Students learn how to write and balance equations originally stated in words. Word Equations and Balancing: The law of conservation of mass is used to provide standard rules for writing and ...

SAN JOSE, Calif. -- When retired math teacher Roberta Koss first picked up a graphing calculator at a bookstore 12 years ago, it was a curiosity--not yet mature enough for use in the classroom.