Pedagogical orientations (OP, 2005) specific to this knowledge, says that one of the specific objectives of this class
is to establish a material balance.
The implementation of these provisions, the chemical transformation of a system is associated with a chemical
reaction that reflects the evolution of the macroscopic system and resulting in a writing called symbolic equation.
However, the kinetics of evolution of the system is discussed in the first and second science class by establishing a
more elaborate model involving reaction intermediates and equations. The study of chemical transformation of a
system begins with the development of tools for macroscopic description of the system involving the definition of
the mole.