The aim of the research was to optimize the effectiveness of student learning based on experimental work in chemistry
classes in Slovenian primary schools. To obtain evidence about how experimental work is implemented during
regular chemistry classes, experimental work was videotaped during 19 units of chemistry lessons at 12 Slovenian
primary schools from the pool of randomly selected schools. Altogether 332 eight-grade students were involved in
the investigation, with an average age of 14.2 years. Students were videotaped during chemistry lessons, and their
worksheets were collected afterward. The 12 chemistry teachers, who conducted lessons in these schools, were interviewed
before the lessons; their teaching plans were also collected. The collected data was analyzed using qualitative
methods. The results indicate that many teachers in Slovenian primary schools are not fully aware of the potential
of experimental work integrated into chemistry lessons for the development of students’ experimental competence.
Further research of the value of different kinds of training to support teachers for the use of experimental work in
chemistry teaching is needed.
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