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All Journal KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia CHEDS: Journal of Chemistry, Education, and Science
Wulan Dwi Safitri
Universitas Negeri Medan
Biochemistry, Genetics & Molecular Biology Chemistry Education Materials Science & Nanotechnology

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PENGEMBANGAN LKPD SIFAT KOLIGATIF LARUTAN BERBASIS PBL UNTUK MENGUKUR KETERAMPILAN BERPIKIR KRITIS PESERTA DIDIK Jaman Fahmi; Budiman Anwar; Wulan Dwi Safitri; Dwi Sapri Ramadhan; Dian Wardana; Dimas Ridho; Ekin Dwi Arif Kurniawan; Ahmad Fauzi Syahputra Yani
KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Vol 9 No 1 (2026): Jurnal Katalis Volume 9 Nomor 1 Tahun 2026
Publisher : Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/katalis.v9i1.13597

Abstract

This study aims to develop a PBL (Problem-Based Learning) based Student Worksheet (LKPD) on the topic of colligative properties of solutions that are valid, reliable, and feasible to be used as an instrument for assessing students’ critical thinking skills. This research employed a Type 1 Design and Development Research (DDR) model consisting of the stages of Analysis, Design, Development, Try-out, and Evaluation, although its implementation was limited to the Try-out stage. The study involved validators comprising university lecturers and chemistry teachers, as well as 106 twelfth-grade science students from MAN 2 Model Medan selected through purposive sampling. Data were collected using semi-structured interview guidelines and assessment questionnaires and subsequently analyzed using the Content Validity Ratio (CVR), Content Validity Index (CVI), item validity tests, reliability analysis, item difficulty index, discrimination index, normality, and homogeneity tests. The findings indicate that out of 16 initial items, 11 essay items were found to be valid (Pearson Corelation > 0,3) and reliable with internal reliability coefficients categorized as good (Cronbach’s Alpha > 0.7). The difficulty indices of the items ranged from difficult to easy, with discrimination indices categorized as moderate to very good. Therefore, the developed PBL-based LKPD is deemed feasible for use in measuring students’ critical thinking skills in the context of colligative properties of solutions.
PENERAPAN MEDIA PEMBELAJARAN BERBASIS WEBSITE MENGGUNAKAN MODEL KOOPERATIF TIPE SCRAMBLE PADA MATERI HIDROLISIS GARAM Wulan Dwi Safitri; Eddiyanto Eddiyanto; Dian Wardana; Dwi Sapri Ramadhan; Jam'an Fahmi
CHEDS: Journal of Chemistry, Education, and Science Vol 9, No 2 (2025)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v9i2.11838

Abstract

Fokus penelitian ini adalah untuk menentukan peningkatan hasil belajar siswa di kelas eksperimen setelah diajar menggunakan media pembelajaran berbasis web dengan model kooperatif tipe scramble pada materi hidrolisis garam. Instrumen yang digunakan adalah 20 pertanyaan objektif. Dari hasil analisis, rata-rata peningkatan siswa kelas eksperimen adalah 0,7414 (kategori tinggi) dan di kelas kontrol adalah 0,5881 (kategori sedang). Berdasarkan hasil uji hipotesis dengan uji t sisi kanan, ditemukan bahwa t hitung lebih besar dari t tabel atau 8,064 2,0021 dengan tingkat signifikansi α = 0,05, sehingga Ha diterima, sehingga peningkatan hasil belajar di kelas yang diajar menggunakan media pembelajaran berbasis web lebih tinggi daripada peningkatan hasil belajar di kelas yang diajar tanpa menggunakan media pembelajaran berbasis web (konvensional).
Co-Authors Ahmad Fauzi Syahputra Yani Budiman Anwar Dian Wardana Dian Wardana Dimas Ridho Dwi Sapri Ramadhan Dwi Sapri Ramadhan Eddiyanto Eddiyanto Fahmi, Jam’an Jam'an Fahmi Kurniawan, Ekin Dwi Arif