https://repositorio.uema.br/jspui/handle/123456789/2226 2026-04-13T12:33:42Z https://repositorio.uema.br/jspui/handle/123456789/5395 Título: Ligações químicas nos livros didáticos de química do PNLD 2021-2025: uma abordagem histórico-conceitual Abstact: Teaching chemical bonds often relies on decontextualized approaches, which can make reflective learning difficult. In this scenario, textbooks emerge as a central pedagogical resource and, therefore, the National Textbook Program (PNLD), aligned with the National Common Curricular Base (BNCC), promoted a structural change, replacing the old Chemistry Textbooks (LDQ) with integrated works of Natural Sciences and their Technologies (CNT) with an interdisciplinary proposal. In view of this transformation, this work aimed to carry out an analysis from the historical-conceptual perspective of chemical bonds in the seven approved CNT collections. To this end, the research adopted a qualitative and interpretative methodology, in which the pertinent chapters are analyzed and compared with primary and secondary references from the History of Chemistry, in order to evaluate the presentation of the historical and conceptual aspects of the subject. The results indicate that the conceptual approach to chemical bonds is generally descriptive and not very in-depth, with the definition of stability being highlighted only in the CNT1 collection. Electronegativity appears with greater emphasis in CNT3 and CNT5, but without any dialogue with their theoretical bases. Regarding the order of presentation, only three collections follow Pauling's theoretical structure. The historical dimension is treated in a punctual and superficial manner, with little contextualization of the characters and theories. It is concluded that the books analyzed lack integration between the conceptual and historical aspects, which compromises the critical and contextualized understanding of Chemistry 2025-07-16T00:00:00Z https://repositorio.uema.br/jspui/handle/123456789/5385 Título: Práticas experimentais na produção de bioplásticos no ensino de química: reflexões sobre sustentabilidade e meio ambiente Abstact: This final course work (TCC) proposed a different approach to teaching Chemistry through the experimental production of bioplastics, focusing on environmental education and sustainability. Plastics (synthetic polymers) are widely used in daily life but often pose environmental problems due to excessive use and improper disposal. Thus, this research aimed to propose the production of bioplastics through investigative experimental activities. The study is qualitative and exploratory in nature and was developed with high school seniors (3rd year) at Centro Educa Mais Maria José Aragão in São Luís, Maranhão, Brazil. It integrated theoretical and practical activities on natural and synthetic polymers. Through lectures and hands-on experiments, students produced bioplastics using potato and industrialized corn starch, applying scientific concepts in a contextualized manner. Biodegradation tests were also conducted in different environments (water, sand, and soil), demonstrating the ecological viability of the bioplastics. The results highlighted the pedagogical potential of the approach, fostering student engagement, environmental awareness, and the development of sustainable practices in the school context. The initiative reaffirms the role of schools in shaping critical citizens committed to environmental preservation 2025-07-17T00:00:00Z https://repositorio.uema.br/jspui/handle/123456789/5383 Título: Desenvolvimento de Bebida Alcoólica Fermentada de Criviri (Mouriri guianensis) – “Crivichaça” 2025-07-15T00:00:00Z https://repositorio.uema.br/jspui/handle/123456789/5382 Título: Diagnóstico e procedimentos de descarte de reagentes vencidos no laboratório de química da Universidade Estadual do Maranhão: uma análise à luz da legislação ambiental brasileira Abstact: The improper disposal of expired chemical reagents poses risks to the environment and public health, especially in academic settings where there is a high turnover of chemical substances. This article aims to assess the storage and disposal procedures of expired reagents in the Chemistry Department laboratory at the State University of Maranhão (UEMA), verifying their compliance with current Brazilian environmental legislation. The research employed a qualitative approach and document analysis. The results revealed the absence of a Chemical Waste Management Plan (PGRQ), inadequate storage practices, and disposal without contracts with licensed companies. The analysis, based on Law No. 12.305/2010 and technical standards such as ABNT NBR 14725, showed noncompliance in several aspects. It is concluded that the implementation of corrective measures is urgent, including staff training, standardization of procedures, and partnerships with specialized companies 2025-07-16T00:00:00Z