Resumo

FERRERA VELAZQUEZ, Thalía Itzel; MENDEZ VARGAS, Nadia Teresa  e  SOSA FERNANDEZ, Plinio Jesús. The chemical reaction in high school: a didactic proposal. Educ. quím [online]. 2018, vol.29, n.4, pp.79-91. ISSN 0187-893X.  https://doi.org/10.22201/fq.18708404e.2018.4.63474.

The present work shows a didactic proposal designed to introduce the concept of chemical reaction to high school students.

The driving axis of the proposal is the chemical reaction as a process in which substances are obtained from others. The proposal consists of four didactic activities: three experimental activities and one reading. In the first three, it takes advantage of the fact that each substance has a different set of properties (the very thing of each substance) to recognize that a reaction has occurred. In the first, substances of different color are formed; in the second, a substance with tear-producing properties is produced; and, in the third, substances with odor are obtained. In the fourth activity, the obtaining of energy from a chemical process is highlighted.

Palavras-chave : chemical reaction; chemical substance; chemical energy.