Abstract
In the work the importance and methodological features of the organization chemical experiment for the formation of natural science knowledge about chemical processes by school students and the development of their critical thinking was shown. The influence of the methodology of conducting a chemical experiment on the success of mastering chemistry in experimental classes and the level of formation critical thinking by school students was established. For identifying the subject erudition of school students in inorganic chemistry, after studying the theme, a control work was carried out, some questions of which required demonstrating the skills of analysis, generalization and formulation of arguments. It was shown that the problem-research chemical experiment provides school students with high motivation to study the discipline, the formation of such important universal educational actions as analysis, synthesis, generalization. Mastering such research skills as setting goals, identifying problems, planning actions to solve it, summing up, contributes to the development of school students' personality through the development of critical thinking. The use of a specially elaborated chemical experiment for the organization of individual and group work of school students in the classroom contributes not only to the development of critical thinking and the formation of skills and abilities, but also to the formation of subject knowledge, confirmed by the results of the formative pedagogical experiment.