The Development of Student Worksheets based on Guided Inquiry by Class and Laboratory Activity for Reaction Rate Material at the 11th Grade in High School

One of the teaching materials that can be used to improve students' understanding of reaction rate materials is guided inquiry-based student worksheets. Student worksheets are created using guided inquiry cycles consisting of orientation, exploration, concept formation, application, and cover. The student worksheet is also packed with involving three levels of chemical phenomena namely macroscopic, microscopic, and symbolic. This study aims to produce a teaching material in the form of student worksheet which is then tested validity, practicality, and effectiveness that can be used as a teaching material in chemistry learning in the 11th grade. Research and Development (R & D) has been used as a method in this type of research. The development model used in this research is the Plomp model which consists of three stages: a preliminary research, prototyping stage, and assessment phase. The result of the validity test showed that the student worksheet obtained a score of 0.85 with the category as high. The practicality test at the one-to-one, small group, and field test stages give a value of 0.86, 0.80, and 0.78 with all three values being in very high categories. In the effectiveness test obtained gain score of students from learning outcomes before and after using student worksheet is 0.71 which is in the high category and the average student activity at each meeting 80%. Based on these results, it can be concluded that the guided inquiry-based student worksheet has been valid, practical, and effectively used in the chemistry learning process at the rate material of the reaction