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After a short reflection on the discrepancy between (learnt vs. transmitted) knowledge and information and some remarks on the relationships between teacher, student and knowledge, whose good balance should be granted by an effective teaching, the present work tackles the issue of didactic transposition, i.e. the process that translates the scientific knowledge into knowledge taught in the classroom...
In the second part of this work, we present an example of didactic transposition carried out in Italy, with high school students. The educational activity is focused on the concepts of chemical transformation, chemical reaction and reaction equation; an achievement of this activity is the introduction of the distinct concepts of atom and molecule by the students themselves, as a hypothesis that allows...
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