Sustancia y reacción química como conceptos centrales en química. Una discusión conceptual, histórica y didáctica

Abstract

The aim of this article is to present a conceptual, historical and pedagogical discussion on two central concepts of chemistry: substance and chemical reaction, from macroscopic to nanoscopic points of view. The way in which both concepts participate in the definition of chemistry is also considered. The obtained results of interviews with teachers and the analysis of textbook on definitions of both concepts are included. The authors made a critical review of the historical and conceptual aspects, looking for approaches that secondary teachers could use on both concepts, make them reflect and carry on adequate models on pedagogical reasoning and action.