Fraude no leite: experimento investigativo para o ensino de química.

Abstract

Chemistry is a science that uses a different language, with symbols and equations that are not yet part of the students' vocabulary, and therefore requires attention. The contents are considered less attractive, making them do not understand the phenomena effectively and cannot associate them with their daily life, leading to demotivation and rejection of the study, hindering the teaching-learning process. The objective of this work is the elaboration of an investigative experiment contextualized as didactic resource in the learning of concepts of chemistry through the investigation of possible frauds in milk. The research was carried out at a private school in the city of Caucaia-CE, with 15 students from a third year high school class. The methodology adopted consisted of four stages: Initially a research was carried out on the field of action of Anvisa and which techniques are used in the analysis of milk, in order to select which of them would have the greatest potential of adaptation in the classroom; The second stage was the elaboration of an experiment that approached contents of the discipline as: Density, oxidation number, catalyst, organic functions, chemical reaction, besides the importance of labeling and milk quality; In the third stage a lecture was given explaining the main theoretical contents that would be approached during the experimentation and also subjects about the functions of Anvisa and the types of food fraud. At the last moment, the students were divided into 4 groups for the experiment. Based on the results obtained, the technical report was filled out, followed by a questionnaire of an evaluative character. The methodology used facilitated the understanding of the subjects addressed, providing the development of the capacity of scientific argumentation and the formation of critical-scientific thinking, besides working the motivation, interest and curiosity of the students.