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An interpretation of the representation technique of the Hybrid Concept Map is proposed from the extension to the school chemistry of some theoretical elements of the Ontosemiotic Approach of Educational Mathematics. In order to show the viability of the proposal, the objective was raised to analyze graphically, through a descriptive case study, the system of practices involved in solving a chemical problem posed in a textual way, by a teacher and one of his students, which involved the use of the concept of limiting reagent. The analysis shows that, in solving the problem, the subjects rely on chemical and chemical-mathematical objects, which are connected and organized in the system of practices; the teacher carried out a predominantly interpretive practice system while the student carried out an operational one; subjects also perform a certain set of cognitive processes that are involved in the production of chemical knowledge.

ANÁLISIS GRÁFICO DE LA RESOLUCIÓN DE UN PROBLEMA QUÍMICO DE REACTIVO LIMITANTE