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

Abstract

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 & 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.