Özet:

The aim of this study is to determine students� understandings related to chemical equilibrium at micro level by using different teaching methods. It was used quasi-experimental method with pre-and posttest. The sample was comprised of 90 first class science teacher education program students. It was studied with three groups: cooperative learning group (student teams achievement divisions method, STAD) (CLG, N=22), cooperative- model group (STAD + models) (CMG, N=41) and control group (CG, N=27). In order to compare the groups it was used a multiple choices Particulate Nature of Matter Test (PNMTa) related to chemical equilibrium. The PNMTa consists of six questions. For determining students� conceptual understandings related to the subject, the PNMTa was rearranged as open-ended with removing choices (PNMTb). According to ANOVA results, it was not found significant difference among groups. Also, according to open-ended question, it was determined some misconceptions related to topic.

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