Herunata Herunata, Ion Wijaya, Oktavia Sulistina, Nazriati Nazriati
Chemistry, especially in the chapter on reaction rates, studies the composition of matter, changes in matter, basic laws, and abstract concepts. The reaction rate chapter is considered difficult bystudents, so the source and learning media are needed to make it easier for students to learn it. One of the sources of learning media is teaching material. Teaching material has an important role because it is a tool to achieve learning objectives. Therefore, new reaction rate teaching material needs to be created to accommodate abstract concepts. These concepts can be described by chemical representationandthen explained through representational competence. Based on the description above, this study aimed to 1) develop valid and appropriate teaching materials for reaction rate-based chemical concepts, chemicalrepresentation, and representational competencies and 2) analyze the validity and legibility tests of the developed teaching materials. The research and development design used was the defining stage, designing stage, developing stage, and disseminating stage, which refers to the 4-D model by Thiagarajan et al. (1974). However, the dissemination stage was not carried out due to time and cost considerations. The research instruments used were a validation questionnaire sheet and a legibility questionnaire sheet. The product was validated by two validators from the lecturers of the Department of Chemistry, Universitas NegeriMalang, and then tested for legibility by 32 students of class XI-MIPA at SMA Negeri 3 Kediri. Quantitative data were analyzed using descriptive statistical techniques with the percentage formula. The data analysis was then interpreted according to the range of criteria according to the Likert scale. Meanwhile, qualitative data were analyzed using descriptive analysis techniques. The teaching material validation results obtained an overall average value of 93.5% with a very valid category. Meanwhile, the results of the legibility test of teaching material obtained an overall average value of 87.5% with a very decent category. Based on the research results, it was known that the teaching material developed was categorized as very feasible with few revisions to be used. Therefore, this teaching material can be further developed for dissemination. © 2024 Author(s).
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, East Java, Malang City, 65145, Indonesia
