Ardelia, Salsabila and Farida, Ida and Nurhayati, Nurhayati (2027) Enhanching science process skills through project-based worksheets on coffe grounds-based soap production in senior high school students. Eduproxima : Jurnal Ilmiah Pendidikan IPA, 9 (1). ISSN 2720-9458 (In Press)
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Abstract
Science process skills (SPS) are a fundamental component of chemistry learning, yet the SPS of Indonesian senior high school students remain relatively low due to limited meaningful laboratory activities. This study aims to develop and analyze the improvement of SPS among senior high school students through the implementation of a project-based student worksheet (LKPD) on soap production using coffee grounds as a natural additive. A pre-experimental one-group pretest-posttest design was employed, involving 36 eleventh- grade students at SMAN 26 Bandung on colloid material. The worksheet was structured according to six stages of Project-Based Learning, and SPS was measured using a multiple-choice test. Prior to implementation, the 15-item SPS test was piloted on 10 students to examine item difficulty and reliability, in addition to the project-based worksheet (LKPD) having been validated by three experts (two chemistry education lecturers and one senior high school chemistry teacher).Data were analyzed using the Shapiro-Wilk normality test, the Wilcoxon Signed-Rank Test, and N-Gain analysis. Results showed that project implementation fell into the very good category (mean = 81.15). SPS scores increased significantly from a pretest mean of 54.99 to a posttest mean of 95.73 (Z = -5.249; p < 0.001; effect size r = 0.88), with an N-Gain of 0.91 (high category). These findings indicate that the project-based worksheet on coffee-ground soap production effectively improves students' science process skills while supporting sustainable organic waste utilization. Keywords: science process skills; project-based learning; student worksheet; coffee grounds; green chemistry
| Item Type: | Article |
|---|---|
| Additional Information: | Blm terbit |
| Uncontrolled Keywords: | science process skills; project-based learning; student worksheet; coffee grounds; green chemistry |
| Subjects: | Chemistry and Allied Science > Research and Statistical Methods of Chemistry |
| Divisions: | Fakultas Tarbiyah dan Keguruan > Program Studi Pendidikan Kimia |
| Depositing User: | salsabila ardelia |
| Date Deposited: | 16 Oct 2026 07:22 |
| Last Modified: | 16 Oct 2026 07:22 |
| URI: | https://digilib.uinsgd.ac.id/id/eprint/144279 |
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