Uma proposta de sequência didática sobre metais: características, usos, produção e impactos ambientais para a primeira série do ensino médio

Abstract

This work was done to present to the Chemistry teachers of the first year of high school a Didactic Sequence addressing the theme "Metals: characteristics, uses, production and environmental impacts. " The idea of working with the theme arose from the possible use in the classroom, the experimental kit name "Quimikit – The Metals", belonging to the collection of the Science Factory (Extension Core of the Federal University of Alagoas /UFAL). This educational material was made in mid-2004 by professors Dr. Reinaldo Augusto Rodrigues and Dra. Tania Maria Piatti and then by colleger Rosangela Paula Moura. The product was used in epoch by Mrs. Rosangela in her Work Course Conclusion (WCC) with the following title: Contribution to the improvement of basic education in Chemistry: making of the kit “The metals". In 2007 I used the same teaching materials in my WCC whose main function to its applicability, the latter then received the title "Theory and practice: a strategy to teach chemistry from experimental kits". The research was discussed in the light of Meaningful Learning Theory of David Ausubel (1980) and Marcos Moreira (2006) where it is a process through which new information relates to non-arbitrary and substantive way (not literal) to the cognitive structure of the learner, we worked with the idea of proposing ways arranged adequate education for this purpose. We propose the Chemical knowledge from the perspective of Science, Technology and Society (STS), according to Marcondes (2009) this methodology improves the criticality of students, promoting interest in science. The Teaching Sequence (SD) proposal was made of twelve (12) classes containing three questionnaires (survey of existing knowledge, focusing exercises and proposed exercises); text; video; laminated tables; among other experiments discussed in this work. The SD was developed building on all items on Quimikit following proposals and guidelines contained in the National Curriculum Parameters (PCN - Brazil). Finally, we hope that this educational product helps Chemistry teachers of the first high school number in their classes according to the theme "Metals", thereby strengthening the teaching and learning consequently the construction of knowledge.