Articles

Development of Problem Solving-Based Student Worksheets to Improve Students’ Science Process Skills on Reaction Rate Material

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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.

Development of Problem-Based-Learning (PBL)-Oriented Electronic Student Worksheets (e-Worksheet) to Improve Critical Thinking Skills of Class XI Senior High School Students on Factors that Influence Rate of Chemical Reactions Material

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Education system changes from time to time, and with these changes, the existing curriculum in Indonesia also continues to undergo several curriculum updates. The Merdeka Curriculum is the answer to the high level of competition that occurs in the 21st century. Factors that influence the rate of chemical reactions are one of the materials in chemistry phase F of the Merdeka curriculum, which has abstract characteristics and requires experimentation. Based on these characteristics, the problem-based-learning (PBL) learning model is suitable for use and can improve students’ critical thinking skills. This research aims to determine the feasibility of developing a PBL-oriented student e-worksheet to improve critical thinking skills on factors that influence reaction rates. The method used in this research is R&D with a 4D model. The results obtained are that the student e-worksheet developed is feasible because the content and construct validity results obtained in mode 5 with a very valid category, then the practicality results obtained a response questionnaire score of 98.44%, which was supported by the results of the student activity sheets, and the effectiveness was obtained. From the data from the pretest and posttest results, which were analyzed using the SPSS Paired Sample t-Test, the results showed that there was an increase in students’ critical thinking skills, namely with a significance value of 0.00.