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Abstract-The purpose of this research are to develop a Student Activity Sheet on discovery-based learning of Basics Laws of Chemistry and test the validity and practicality of LKS produced. This type of research is the Research and Development (R & D). Development models used in this study is a four D models, namely (1) define , (2) design , (3) develop and (4) disseminate. This study is limited to the development stage. The instrument used in this research is the questionnaire of validity and practicalities. LKS developed validated by 7 people validator, consisting of five chemistry lecturers and two chemistry teachers. Practicality test carried by four chemistry teachers and several X grade students of MAN 3 Padang. Based on the research that has been conducted, the product produced Student Activity Sheet discovery-based learning for material Basics Laws of Chemistry that its validity and practicality had been examined. LKS produced has an average value of 0.90 with the validity of the category of very high validity, average of teachers practicality is 0.85 with very high practicality categories and average of students practicality is 0.72 with high practicality category.

A research has been done to develop student worksheet with scientific approach and discovery based learning in Acids and Bases topic to learn chemistry for grade XI senior high school and also to describe it’s validity and practicallities. The research used Research and Development (R&D) method. The model has been used is 4-D model, which consisted of define, design, develop and disseminate. Instruments of this research is questionnaire which consisted of validation sheet and practically sheet. Validity sheet was given to 4 chemistry lecturers and 2 senior high school chemistry teachers while practicallities sheet was given to 3 chemistry teachers and 25 students from SMAN 12 Padang. Based on the research, student worksheet product has been developed with scientific approach and discovery based learning in Acids and Bases topic for grade XI senior High School. The average value of validity is 0,92 which very high validity category while the average value of practicallities is 0,82 which very high practicallities category. Based on the data, it can be seen that the student worksheet on Acids and Bases topic with scientific approach and discovery based learning for grade X senior high school has very high validity level and very high practicallities level.

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