Abordagem de conceitos e conteúdos de Química no Ensino Médio por meio da temática “Química Forense”: papiloscopia e esteganografia.

Abstract

Forensic Chemistry had a gradual replacement of the so-called classical methods of analysis, by instrumental methods, with techniques and procedures with potential for use in practical classes for teaching Chemistry. In this sense, the objective of this work was to approach forensic chemistry as a strategy for motivating the Chemistry teaching and learning process, based on the proposition of experimental practical activities based on forensic chemistry techniques for teaching Chemistry in High School, and developing methods that can contemplate and also describe examples and forms of approaches for producing expository classes for teaching Chemistry. Practical and theoretical activities were proposed for a 1st year class of the Technical Course in Chemistry at a public school in the city of Itumbiara-GO. The activities were carried out in 2 consecutive classes (45 minutes each), and 25 students participated. The planning focused on revealing fingerprints and invisible messages through the use of forensic techniques based on chemical reactions and interactions. From the proposed activities, aspects of polarity and solubility of molecules, intermolecular forces, granulometry, changes in physical states of matter and acid-base chemical reactions, combustion reactions and complex formation were explored. The active participation of students was observed in the development of the proposed procedures and in moments of discussion when they presented considerations on the activities developed, sometimes with a scientific character, sometimes with a character arising from common sense. It can be seen that there was an understanding of the relationship between knowledge in Chemistry and knowledge in the area of forensic analysis, so that the use of simple practical experiments based on forensic techniques can be interesting tools for teaching chemistry concepts in classes of this discipline in the High school.