摘要：Many studies carried out on the mole concept emphasize that students show significant difficulties in learning this concept. The aim of our research was to analyze those difficulties that students, who have their first contact with chemistry in school, encounter, and also to examine the usefulness of systemics as a graphical way of knowledge representation. The sample of the study included seventh grade students from a primary school in Novi Sad, Serbia. Based on the results of the pre-test, students were divided into three main groups: "excellent", "good" and "acceptable", which all consisted of two subgroups: experimental and control. Students in the experimental subgroup were learning by applying systemics, while the students in the control subgroup were taught by traditional method. The final results show that systemics is convenient in overcoming the difficulties in the case of "excellent" and "acceptable" groups of students, while the same cannot be concluded for the students characterized as "good". Systemics has not proved to be adequate for them. The following question remains a topic for the future research: Is there any way that the group of students characterized as “good” still benefits from learning with systemics? In addition, new research on a larger number of students should be conducted, in order to statistically confirm these results, or to discuss new ones.
关键词：concept map; difficulties in learning mole concept; ontology; systemics.
