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In this trial was discussed in the learning of science and in particular of the chemistry, the science laboratory is a key element in the practice. Traditionally it has been pointed out that the teaching of the practice has intentions to strengthen the teaching of theory, but not all practices carried out in the laboratory comply with that objective, in that some practices are type recipe with educational scope very limited as to know or understand, thus it is that, as a function of the signs of Tolman and Vygotsky, proposed laboratory practice based more on the scientific inquiry that it address problematic situations of interest, and in the repetition of indents pre-established. [ABSTRACT FROM AUTHOR]