The article contains valuable ideas about the methods of the learning process that influence the
increase of cognitive activities. It is concluded that increasing the cognitive activity of students is
primarily related to thinking activity and activities in learning. Cognitive activity occurs in students
through cognitive tasks. Accordingly, cognitive activity is characterized as a special manifestation of
students' enthusiasm, interest, desire for learning, learning, and mastering skills. In the studies,
opportunities to increase the activity and interest of students in the chemistry class through cognitive
tasks are provided. Pedagogical-psychological and methodological basis of increasing students'
cognitive activity is presented. Since chemistry is a study subject belonging to natural sciences, forming
a personal image of chemistry in the minds of students plays an important role. The peculiarities of the
use of cognitive tasks in the teaching of chemistry at school depend on their full compliance with a
number of didactic requirements and their regular use. Cognitive tasks in chemistry are a special type of
tasks that increase the activity of students.