The article considers the possibilities of forming ideas about scientific and natural sciences in
primary school through the subject "Chemistry". The subject of chemistry allows students to better
understand natural phenomena and evaluate them from a scientific point of view. A chemical
experiment was chosen as the leading method of chemistry in forming ideas about scientific and
natural sciences. A chemical experiment allows solving a number of problems not only in obtaining
the results of subject teaching, but also in achieving metadisciplinary results and forming concepts
of scientific and natural sciences. Laboratory experiments are carried out by performing practical,
situational, experimental, formative, diagnostic and other cognitive tasks that test students' ability to
solve metadisciplinary problems in scientific and natural sciences and work with information
presented in various forms. Formative tasks are designed to develop logical thinking, creativity and
experimental skills of students, and diagnostic ones are designed to deepen formative tasks. In the
article, students will become familiar with the concepts of concentration, qualitative reaction and
neutralization based on these tasks.