Abstract

The problem in this study is the demand for critical thinking skills that must be possessed by students along with the development of the 21st century which is increasingly digital by maintaining an understanding of the chemical concepts taught. The purpose of this study is to determine the validity of the Electronic Student Worksheet (E-LKPD) to improve critical thinking skills in the material of chemical nomenclature and chemical reaction equations. This study uses a Research and Development (R&D) approach with a research flow adopting a 4D development model (define, design, develop, and disseminate) but only carried out up to the 3D stage, namely define, design, and develop. The feasibility of E-LKPD is seen from the results of the validation of material experts obtaining 92.39% and the results of the validation of media experts obtaining 99.17% with a “very feasible” category. Furthermore, the results of the validation of material experts and media experts were analyzed using the Gregory Matrix method obtaining 1 which means “very valid”. So that, the developed E-LKPD is declared feasible according to experts with a very feasible category for use in learning.