Pemanfaatan Limbah Cangkang Telur sebagai Media Praktikum Pemisahan Campuran untuk Meningkatkan Keterampilan Proses Sains Siswa Sekolah Menengah
DOI:
https://doi.org/10.29303/goescienceed.v7i4.3423Keywords:
Eggshells, Filtration, Science Process Skills, Mixture SeparationAbstract
Laboratory activities on the separation of mixtures in schools do not yet fully provide students with the opportunity to analyze problems, provide evidence-based reasoning, and evaluate experimental results. This study aims to determine the effect of the method of separating mixtures using eggshell waste on students’ critical thinking skills. The study employed a pre-experimental, one-group pretest-posttest design involving 35 eighth-grade middle school students. The laboratory activity involved constructing filters from cotton, tissue paper, charcoal, eggshell powder, and zeolite to filter simulated wastewater. The data were found to be non-normal based on the Kolmogorov-Smirnov one-sample test (0.001). The results showed that the pretest mean of 62.05 increased to 90.35 on the posttest, with an average gain of 28.30 and an N-gain of 0.77, classified as high. The Wilcoxon test yielded a p-value of 0.000, indicating a significant difference between the pretest and posttest scores. These results indicate that the laboratory experiment on mixture separation using eggshell waste can develop students’ critical thinking skills in contextual science learning. This experiment can enrich laboratory materials that are simple, economical, and readily available, while also utilizing household waste as a valuable resource in science education.
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