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The purpose of this classroom action research was to investigate ways to develop scientific conceptual understanding and scientific reasoning in Stoichiometry through conceptual change approach for grade 10th students. The research methodology was based on the concept of Kemmis through continuous PAOR cycles in 3 times. The data of this study were collected by reflective learning tool. The qualitative data were then analyzed by content analysis and verified of reliability by using resource triangulation. From the result, it was found how to teach on conceptual change approach in order to develop scientific conceptual understanding and scientific reasoning as follows: 1) The questions were used in student activity sheets to repeat the original scientific conceptual understanding and must be associated with the new conceptual understanding, 2) there are questions to discuss in classroom to change the students’ scientific conceptual understanding, and 3) the situations of problem should be interesting and must be on the same theme in 3 cycles. From using conceptual change approach as above could enhance students’ conceptual understanding to level of complete understanding and also reach their scientific reasoning to high level.
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