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This research aims to produce student worksheet with class and laboratory activity based on guided inquiry in electrolyte and non-electrolyte solution materials and then express its validity and practicality. This research used the type of research and Development (R &amp; D) research with the Plomp development model. The instrument used is a validity and practicallity questionnaires their data were processed by using the kappa cohen (k) formula. Based on the validity of the questionnaire, it showed that the developed LKPD has a substantial validity with k = 0.80. The data showed that the developed student worksheet has been valid. Based on the practicality questionnaire data in the small group evaluation obtained an almost perfect level of practicality with k = 0.83. Based on the practicality questionnaire in the field test obtained an almost perfect level of practicality with k = 0.87 based on the teachers’ responses andk = 0.85 based on the student’s responses.

Development of student worksheet with class and laboratory activity based on guided inquiry in electrolyte and nonectrolyte solution materials