This study aims to develop an E-LKPD based on the Attention, Relevance, Confidence, Satisfaction (ARCS) model on the material for a valid SMA/MA Equivalent reaction rate and to determine the user's response to the E-LKPD. The type of development used in this research is Research and Development (R&D) with a 4-D development model. Data collection instruments were in the form of validation sheets…