CHEMISTRY EXPERIMENTS DURING THE NATURE STUDIES IN THE 6th FORM

In this article the concepts such as solvent, solution, soluble and insoluble substances, filtration and volatilization are consolidated during integrated lessons of the nature studies in the sixth form. Later these concepts are met just in the eighth form, having started studying chemistry. Also healthy nutrition problems were solved. During the lesson, students made experiments, observed, compared and evaluated. Lemonade was the chosen object of the experiment. The following questions were brought up: does lemonade burn, dye, what do we notice filtering, what substances are dissolved in it, can we volatilize lemonade and is it good for our health? Children worked in groups. The first group tested combustibility of the lemonade, the second group was filtering and the third one was volatilizing it. Another one had to examine whether lemonade dyes wool. Children of the fifth group recorded and evaluated the composition of the lemonade. Every group presented the obtained results to the other ones. It was ascertained that lemonade, although delicious, is not recommended to drink in large amounts, especially for children, because it contains not useful and even harmful substances; lemonade is incombustible, there were not any residues in the filter, lemonade is a solution while volatilizing it water is volatilized and other substances remain; lemonade dyes wool. The following recommendations are made as well– to drink more juice, pure water, dairy products and to pay much more attention to the information provided on the labels of drinks. The practice of the authoress proves that investigative activities develop skills of independent work, arouse curiosity, help to know and evaluate the surroundings.