Practical Guide for Determining the Reaction Rate and Reaction Order Based on the Colorimeter® Application

The practical activities needed in chemistry lessons. However, during the covid-19 pandemic, a suitable guide is needed. Therefore, that can involve students directly online learning and blended purpose of this study to determine feasibility Practical Guide for Determining Reaction Rate Order Based on Colorimeter® Application based expert judgement students’ response. This employs research development (R&D) using 4D(Four-D) model, starting from define, design, develop, dissemination stages. limited develop stage due time ability researcher. subject was which tested 6 initial trial 20 Chemistry Education FKIP Untan main trial. Data collection tools used are assessment sheets response questionnaires. results Gregory test closeness model indicate very feasible criteria with validity value 1.00 high level terms content, language, graphics. result obtained an average percentage 91% 94% respectively good criteria. imply developed use activities. In addition, has attractive appearance be support understanding reaction rates’ concepts.