Concepções Alternativas Dos Alunos Sobre Os Conceitos De Átomo, Molécula E Ião Na 7ª Classe Do I Ciclo Do Ensino Secundário

Abstract

The present document is the product of a deep reflection on the interesting and current problematic about the students' alternative conceptions about the concepts of atom, molecule and ion of the 7th grade of college nº 90. The students' alternative conceptions, as a teaching variable can to create a barrier in the learning of these concepts, being central in the teaching of Chemistry. The objective of this work is to identify the alternative conceptions of the students of the referred college on the concepts of atom, molecule and ion. This work assumes an exploratory-explanatory design and, for its accomplishment, theoretical and empirical methods were used. An inquiry questionnaire was applied to chemistry teachers and a knowledge test to students from the same college for data collection. The results show that these students exhibit alternative conceptions about these concepts and the teachers do not use the students' alternative conceptions in their pedagogical practices. Finally, a list of alternative conceptions of the students about the concepts of atom, molecule and ion was elaborated.