Um método para avaliar a taxa de corrosão

In this paper it is proposed an indirect method to evaluate the corrosion rate of an aluminum and zinc alloy in alkaline solution by using a well-known device for collecting gases over water. The hydrogen gas formation, a corrosion product, is monitored at different time intervals and associated with the alloy mass loss. It has been suggested that the students should work in groups, which may make feasible the social interaction among them and that results discussion may be done collectively under a professor orientation. This proposal may propitiate the learning of terminology and involved concepts as well as contribute to a better understanding of corrosion phenomena that occur in their everyday life.

Avaliação do efeito de gases poluentes na corrosão metálica: um experimento para o ensino da corrosão

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Uma experiência didática de corrosão usando colorimetria visual

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

A formação em Química discutida com base nos modelos proposto por estudantes de pós-graduação para o fenômeno de dissolução

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

A influência dos processos que buscam a autoformação: uma leitura através da fenomenologia e da Semiótica Social

Os Estágios Supervisionados são disciplinas integradoras entre o conhecimento específico e os conhecimentos pedagógicos. Neste trabalho, apresentamos resultados de uma pesquisa realizada com Licenciandos em Química utilizando a Metodologia Investigativa. O objetivo foi buscar as percepções dos sujeitos a respeito da própria aprendizagem e sua transferência ao processo de ensino. Utilizou-se o referencial proposto pela Fenomenologia e Semiótica Social para a análise dos dados. Confirmaram-se o potencial da metodologia no desenvolvimento metacognitivo dos sujeitos e na evolução de suas concepções. Estes valorizam a construção de estratégias de aprendizagem como um processo pessoal e profissional. A reflexão levou-os a reconhecer a complementaridade entre ensinar e aprender, como processos indissociáveis, e geradores de conhecimentos aplicáveis à atividade profissional.

Uma experiência de corrosão metálica em meio ácido

In this paper it is proposed a method to characterize the corrosion reactions of many metals and alloys in acid media and to evaluate the corrosion rate. An alloy of aluminum and zinc was partially dissolved in HCl solution and the medium acidity decrease was monitored at different time intervals by using a pHmeter. Data analysis and physical chemistry treatment permitted associate the pH increase with the alloy mass loss. This proposal promotes learning of terminology and concepts involved as well as contribute to better understand the corrosion phenomena.

A matemática na formação do químico contemporâneo

Pós-graduação em Educação Matemática - IGCE

Representações para o processo de dissolução em livros didáticos de Química: o caso do PNLEM

Dissolution representations in Chemistry textbooks: the case of PNLEM. In Chemistry education, so as in other sciences, the use of images is fundamental in the process of teaching and learning. By virtue of this, the textbooks can be a vehicle of such importance, therefore contributing with many images and representations. In this context, the present work has as objective to promote the analysis of the six books approved by the “Programa Nacional do Livro do Ensino Médio, (PNLEM)”, being the main subject of investigation, the dissolution phenomena. Although the recognized importance of opperate in the theoretical and conceptual level to understand chemistry phenomena, our results suggest the need of greater reflection concerning the emphasis attributed to this hability. And so, this paper has as purpose contributing in the reflection of the professor during the choice and use of the LDs and in the process of evaluation of the same.

Corrosão do aço-carbono: uma abordagem do cotidiano no ensino de química

In this paper, two simple ways of evaluating carbon steel sheet corrosion in a hydrochloric acid solution were presented as an experimental proposal for corrosion teaching. The first method is based on direct measurements of mass before and after corrosion tests. The second approach follows the principle of visual colorimetry by which soluble corrosion products are transformed into red complexes allowing monitoring of the products'concentration according to increases in solution color intensity. Both methods proved able to determine the corrosion rate.

Análise experimental da resistência à corrosão e da velocidade de corrosão: uma proposta pedagógica

In this work it is proposed the use of a chemical activity, in which a corrosion process occurs, aiming to provide to the student relationship among the learning concepts and corrosion phenomena that occur everyday. It is suggested that the experiment development is based on Vygotsky theory, so that students work in groups, which may facilitate social interaction among students and results discussion among groups under professor guidance. This proposal can provide the involved concepts learning, as well as student training such as a critical and reflexive individual.

Uma experiência didática sobre viscosidade e densidade

In this work, a teaching experience is proposed in order to evaluate and differentiate, in a simple and clear way, two intrinsic properties of matter that make part of daily vocabulary, viscosity and density. To this end, three liquids for domestic use have been chosen, namely saccharose solution, biodegradable detergent and vegetal soybean oil. The results analysis evidences the lack of a proportional relationship among these properties.

Pedagogical practices carried out during an in-service teachers education project: approaching history and philosophy of science to physics teaching

We report here part of a research project developed by the Science Education Research Group, titled: "Teachers’ Pedagogical Practices and formative processes in Science and Mathematics Education" which main goal is the development of coordinated research that can generate a set of subsidies for a reflection on the processes of teacher training in Sciences and Mathematics Education. One of the objectives was to develop continuing education activities with Physics teachers, using the History and Philosophy of Science as conductors of the discussions and focus of teaching experiences carried out by them in the classroom. From data collected through a survey among local Science, Physics, Chemistry, Biology and Mathematics teachers in Bauru, a São Paulo State city, we developed a continuing education proposal titled “The History and Philosophy of Science in the Physics teachers’ pedagogical practice”, lasting 40 hours of lessons. We followed the performance of five teachers who participated in activities during the 2008 first semester and were teaching Physics at High School level. They designed proposals for short courses, taking into consideration aspects of History and Philosophy of Science and students’ alternative conceptions. Short courses were applied in real classrooms situations and accompanied by reflection meetings. This is a qualitative research, and treatment of data collected was based on content analysis, according to Bardin [1].