Abstract :

The development of the education system encourages curriculum updates in Indonesia, one of which is through the implementation of the Merdeka Curriculum which emphasizes strengthening 21st century skills, including science process skills. Reaction rate material in chemistry subjects is abstract and requires an experimental approach to support concept understanding. This study aims to develop a problem solving-based Learner Worksheet  that is feasible to use in improving students’ science process skills on reaction rate material. The research method used is Research and Development (R&D) with the 4D model (Define, Design, Develop, Disseminate), limited to the Develop stage. The limited trial was conducted on 30 students of class XI SMA IPIEMS Surabaya. The instruments used included review sheets, expert validation, learner response questionnaires, activity observations, and science process skills tests (pretest and posttest). The validation results show that the LKPD has a high level of validity in the aspects of content, language, presentation, and graphics. Students’ responses to the LKPD were very positive with an average score of 98%, which indicated the practicality of the Worksheet. The effectiveness of LKPD is also supported by an increase in science process skills scores based on pretest and posttest results. The effectiveness of LKPD is also supported by an increase in science process skills scores based on pretest and posttest results.

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Keywords :

4D development, LKPD, problem-solving., Reaction Rate, science process skills

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