Proposta de sequência didática utilizando o tema tratamento de água no contexto do ensino de química para o ensino médio

Abstract

Contextualization in chemistry teaching through themes that are present in the student’s daily life is one way to promote more meaningful teaching. Knowing, for example, the importance of chemistry in guaranteeing the quality of the water supplied to the population, is an opportunity for the students to experience chemistry in a theme that is part of their daily life. In this sense, the main objective of this work is to establish a didactic sequence to promote the knowledge of first-year high school students about water treatment and its relationship with chemistry. In this context, a didactic sequence (SD) was proposed, which had the CTSA (Environmental – Science – Technology – Society) as an approach and the pollution of water bodies as an initial theme and, later, the constitution of the collecting system, treatment, and distribution of water, highlighting the treatments commonly used in Water Treatment Stations, addressing the chemistry involved in these processes, in addition to proposing an evaluative activity to analyze student learning. As a complement, a booklet was prepared with information on pollution and water treatment, which could be used during classes with the didactic sequence. With the preparation of the material, it can be seen that the CTSA approach associated with the development of the didactic sequence and the booklet would significantly contribute to the teaching of content on the separation of mixtures, bringing together and motivating students to build knowledge playfully and permanently.