A química das tintas como contexto para o ensino de química do ensino médio

Abstract

The present work is the object of research on the "chemistry of paints" as a context for the teaching of high school chemistry. The main objective of this project is to evaluate some aspects of the chemistry involved in paints, associating with the topics addressed in secondary education. One of the objectives of this work was to show students the connection between didactic chemistry and everyday chemistry, thus helping to understand the chemistry subjects discussed in the classroom. It was developed in 2017, in a school in the state school network of the city of Caucaia-CE with a class of the first year of high school, composed of 17 students. Initially, a questionnaire with five questions about mixes and solutions was used to verify students' previous knowledge about the subject. Next, the importance of the inks and the four basic elements of their composition, as a way of contextualizing the knowledge of chemistry, were demonstrated through dialogic expositive classes. At the end of the presentation, a new questionnaire containing the five initial questions, with some modifications, was applied to evaluate the students' knowledge after the explanation. In the initial questionnaire the indexes obtained were very low, leading one to believe that they had little knowledge about the investigated subject (mixture and solutions). After the didactic explanation, it was verified through the post-questionnaire that these indices had a significant increase in relation to the previously applied questionnaire. It was shown in the realization of this work that this new methodology aroused more students' interest in learning, in this way, it is believed that the use of contextualization as a methodological proposal in chemistry classes, a method that although still a Object of study, in order to allow students a more direct understanding of daily life, can bring satisfactory results if applied correctly.