Development of Teaching Materials Based on Understanding Chemical Concepts, Chemical Representations, and Representational Competence on Salts Hydrolysis and Buffer Solutions Wahyu Ade Dwi Anugra (a), Herunata(a*)
Universitas Negeri Malang
Abstract
Excellent learning holds up by good teaching materials. Chemistry teaching materials with good quality contain all conceptual and representation aspects. The material for hydrolysis of salt and buffer solution is difficult for students so learning media sources are needed to make it easier for students to understand the material. Learning materials for hydrolysis of salt and buffer solutions will be more effective and efficient if students learn to use teaching materials developed by the teacher. Therefore, the aims of this research were to 1) Develop teaching materials for hydrolysis of salt and buffer solutions based on understanding chemical concepts, chemical representations, and representational competence and 2) Determine the feasibility of teaching materials on salt hydrolysis and buffer solutions based on understanding chemical concepts, chemical representation, and representational competence. The research method used was a research and development method with a 4-D development model that is limited to three stages, namely defining, designing, and developing stage. The research instruments used were a validation questionnaire worksheet and a readability test. The outcome of this research and development was a teaching material product that refers to the 2013 curriculum syllabus. This product was verified by two validators consisting of one Chemistry lecturer at the State University of Malang and one Chemistry teacher. The overall validation results showed an average percentage of 87% which means that the product was very valid. The product readability test was carried out on 25 students of MAN 1 Pasuruan, the average percent of eligibility was 91% means very feasible criteria. Therefore, this teaching material has the potential to enter a further stage in a limited-scale or wide-scale trial so that it is ready to enter the dissemination stage.
Keywords: teaching materials, understanding chemical concepts, chemical representation, representation competence
