Proposal for validation of teaching and learning sequences: the study of a TLS of stochiometry

The objective of the present investigation was to elaborate and discuss aspects of validation of a teaching and learning sequence (TLS) on stoichiometric calculation, inspired by the research methodology of Didactics Engineering. It is about the elaboration of an TLS by a graduate in Chemistry under the guidance of the teacher-trainer, based on the following steps: i) previous analysis; ii) elaboration of the SEA on stoichiometric calculation in the CTSA perspective; and, iii) a priori validation of SEA. In the data analysis, the main focus was the a priori validation process, using a validation instrument based on the studies by Guimarães and Giordan (2013), answered by eight volunteers. The data analyzed from the evaluation items: structure and organization of SEA; problematization of SEA; SEA content and concepts; teaching methodologies; the school and SEA and; SEA and its relationship with the school's Political Pedagogical Project, helped to understand and provide feedback on the material prepared, as well as identify possible adjustments to be made in a future application. Overall, the organization of the SEA in a CTSA approach and the use of the Jigsaw cooperative learning methodology has the potential to contribute to citizen education. In addition, the discussions pointed out about the importance of the validation process of the teaching-learning sequences and the steps guided by Didactics Engineering promotes advances both for the school, for the students' learning, and for the Chemistry Teaching area.