Contexto historico e reflexões didaticas no processo de ensino/aprendizagem do conceito de equilibrio quimico / Historical context and didactic reflections in the teaching and learning process of the concept of chemical equilibrium

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

In this work, the subject chemical equilibrium was the object of study under didactic perspective, considering its relevance in conceptual terms as well as aspects related to the teaching/learning process, as difficulties presented in the language and interpretation of this concept pointed in the literature and by high school teachers. In this context, aspects of historical development of this concept were investigated in order to recovery important information to subsidize a critical evaluation of commercial textbooks and to improve propitious situations the teaching/learning process in the classroom. At the same time, two didactic proposals were elaborated and tested. The first proposal A involved the elaboration of the support material for teaching chemical equilibrium including contextualized lessons, experimental demonstrations and historical approaching and it was applied to three groups of students (81 participants) of 3rd grade in 2007. The other proposal B was limited to the traditional theoretical aspects and was applied to nine groups (236 students) of 2rd and 3rd grades in 2006 and one group with 33 students of 3rd grade, in 2007, all of high school. Written questionnaires and interviews were to investigate previous and after-lessons conceptions of these students on questions involving the concept of chemical equilibrium. The results of this study indicated advantages in the process of teaching/learning in the application of the proposal A, that included situations that became opportune to the professor to the discuss some concrete aspects including experimental demonstration and I also showed the positive effect of talk about how the scientific knowledge is built under a historical perspective and the dynamic growing of the Science. Despite of this proposal demanding some additional efforts from the professor, mainly concerning to the experimental demonstrations and quarrel of historical aspects, the reached results are compensating.

ASSUNTO(S)

equilibrio quimico historia da ciencia history of science experimentação experimentation chemical equilibrium

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