摘要:AbstractTeachers and students are the main actors in the educational action. The teacher is primarily responsible for the transmission of knowledge. The action of teaching is essentially to bear on the mental representations of students in order to find an entry in their cognitive systems developed. However, achieving this goal is not obvious, and common methods of teaching are not always effective. Thus, obstacles persist with regard to the education of students and hinder the educational action. Thus we conducted observations in classroom situations. We stopped with volunteer teachers who had scheduled sessions with their pupils. The research was based on an observation checklist dealing with the following topics: the approach taken by the teacher throughout the lesson, the user operating and alternation and the quality and appropriateness of the content. The analysis of the results of these observations shows the existence of a large number of obstacles to the realization of effective teaching of chemistry in Moroccan schools.