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This study aims to determine the feasibility of guided inquiry green chemistry practicum developed based on the results of standardization and the opinion of expert validators. This research used the Development Research method with the development of the ADDIE model (Analysis, Design, Development, Implementation and Evaluations). The sample in this study were 3 chemical practicum guides of class XI that have been circulating. The validator in this study were 6 chemistry teachers, and 2 chemistry lecturers at Medan State University using developed BSNP-based validation questionnaire. From the results of the teacher and lecturer validation of the chemistry practicum guide developed showed that the guided inquiry green chemistry practicum guide is very feasible to use as a practicum guidebook, which the result of the analysis to four practical guiding components is in average value of 4.78