Development of Structured Assignment Sheet on Reaction Rate Materials To Train Problem-Solving Skills

This study aims to determine the feasibility of a Structured Assignment Sheet (SAS) on the reaction rate material to practice student Problem-Solving Skills (PSS) in terms of validity, practicality, and effectiveness criteria. The method used in this research is Research and Development (R&D). The instruments used were validation sheets, student response questionnaires, and problem-solving skills test sheets. SAS that developed was tested on 15 students of XI grade who had received material on reaction rates at SMAN 1 Manyar and SMA Assa'adah Bungah. The SAS's validity was obtained based on the assessment of two Chemistry lecturers of Universitas Negeri Surabaya and two chemistry teachers at SMAN 1 Manyar and SMA Assa'adah Bungah. The validity has obtained a percentage of content validity of 92% and constructs validity of 90%, both of them were included in the very valid category. The practicality of the SAS was obtained through student responses. It obtained a positive response of 100% in the very practical category. The effectiveness of SAS was obtained through an N-Gain score of 0.8 with high criteria. That shows that the SAS-PSS developed is suitable for use in the learning process.