The development of discovery learning-based teaching module to support student concept mastery on redox

Modules are important teaching materials to be developed in the learning process. The discovery module is one solution that can help students distinguishing between oxidation reactions, reduction oxidizing agents, and reducing agents. This study aims develop a product form of learning-based measure students’ cognitive abilities on redox material. method used this research R & D (Research Development) with 3D development model, namely Define, Design, Development. results obtained from experts valid terms material percentage value 89.17% media 91.4%. effectiveness using was tested at Pangudi Luhur St. Louis IX Sedayu Senior High School Yogyakarta pre-test post-test calculated by gain score formula an increase 0.56 moderate criteria. student response questionnaire average 80.13% good category while teacher’s gets very 94%. use modules reaction valid, effective, practical improve abilities.