Desenvolvimento de uma sequência didática para o ensino de concepções sobre estrutura atômica e periodicidade química nas séries finais do ensino fundamental

Abstract

This work presents the results of the application of a teaching sequence (TS) to a Elementary School II ninth grade class of Colégio Nossa Senhora Auxiliadora, part of Salesian School network, a private institution in the city of Bagé - RS. In order to develop, implement and evaluate teaching activities to address topics of atomic structure and chemical periodicity, mediated by a mobile application and a virtual teaching and learning environment. For the implementation of SD, the author developed a mobile application for the dissemination of content and teaching materials, together with a virtual Google Classroom teaching and learning environment. A logbook was built by the students to record the resolution of the didactic units presented by the teacher, as well as a concrete lapbook material after the SD implementation. Students' performance was quantitatively evaluated according to the method of normalized learning gain through pre- and post-tests containing objective questions about all the content worked on. Students' visual and textual productions in lapbooks and logbooks were qualitatively analyzed. Visual and / or textual elements were sought in these two materials that would provide evidence of how the students made the landscape crossings recommended by the TFC. As main results, the class presented a normalized learning gain of 54.31%, which is considered a very good result. It was also possible to observe some evidence of how the students constructed their conceptions about structure of matter and periodic laws by analyzing the concrete materials.