L’elaboració de sabó casolà com a eina per construir el model Canvi Químic

This article presents the design and implementation of a didactic unit entitled “From used cooking oil to soap: magic, Physics or Chemistry?” which deals with the chemical change model. The didactic unit has been contextualized in the making of soap from used cooking oil, a simple but very illustrative experience that allows working several aspects of this sci-entific model.