The purpose of this research was to develop a measurement instrument to assess student’s competence in connecting multiple representations in chemistry, specifically focusing on acid-base titration topics. The student’s competency was categorized into three levels, ranging from level 1, students demonstrate a correct understanding of the concept of acid-base titration and representation at the macroscopic, submicroscopic, and symbolic levels, without connecting these levels, to level 3, indicating complete a correct understanding of the acid-base titration concept and can connect its relationship in all three levels of representations. The instrument comprised 11 items based on the defined competencies. Data were collected from 344 students in grades 11 and 12 at the high school level. The instrument was analyzed for reliability and validity using Rasch analysis. Results indicated that the standardized residual responses for the developed items met the criteria for local independence as defined by the Rasch model. When comparing the difficulties of items and students' abilities on the same scale, the discrimination of items and the reliability of items met the criteria. However, the Rasch analysis suggested the need for revisions of some questions in the instrument for further study. The measurement instrument could serve as a standardized test for assessing students' competence in connecting multiple representations in chemistry, specifically within the context of acid-base titration topics.

Authors:
Prempree Duangpummet, King Mongkut’s University of Technology Thonburi, Thailand
Duanghathai Kunwatthanaphan, King Mongkut’s University of Technology Thonburi, Thailand
Warunee Khirirat, King Mongkut’s University of Technology Thonburi, Thailand
Pirom Chenprakhon, Mahidol University, Thailand

About the Presenter(s)
Dr Prempree Duangpummet is a University Assistant Professor/Lecturer at King Mongkut’s University of Technology Thonburi in Thailand

Connect on ResearchGate
https://www.researchgate.net/profile/Prempree-Duangpummet

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