Abstract

The development of learning media is an alternative way to help students better in understanding the material. For learning chemistry, students not only need knowledge but the way to understand students’ cognitive scientifically and their interpretations of thinking about the problem and human life. The research aimed to develop a learning media as a source of learning so that students get more in the learning process. The research method was Research and Development (R&D) by adopting the ADDIE model (Analysis, Design, Development, Implementation, Evaluation), where the product has been developed as a dictionary with the concept of representational triplet in chemistry (macroscopic, sub-microscopic, and symbol). The data collection techniques were test, observation, and questionnaire techniques, while the obtained data were descriptively analysed and N-gain test was calculated to observe student learning progress. The results revealed that understanding chemistry in representation through learning media, i.e. dictionary, can give students an overview of aspects of epistemology and their relationship to their beliefs. That is, validity, practicality, and effectiveness are not only limited to fulfilling the feasibility of a product but how it constructed their preconceptions to be scientific and contextual concepts through the product.

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