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Hydrogen: Jurnal Kependidikan Kimia
Published by Universitas Pendidikan Mandalika
ISSN : 23386487     EISSN : 26563061     DOI : Prefix 10.33394
Core Subject : Science, Education,
Chemistry Education
Hydrogen: The Chemistry Education Journal published by the Chemistry Education Study Program which contains articles raised from the results of conceptual research and studies in chemistry and chemistry education including education and learning, device development, media and learning models.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 664 Documents
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Synthesis and Application of CaO-MgO Catalyst from Dolomite for Biodiesel Production Poeloengan, Vikky Pramudya Herdiansyah; Pratama, Ananda Melati Octa; Saputro, Erwan Adi
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 1 (2026): February 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i1.19579

Abstract

Dependence on dwindling fossil fuels drives the development of biodiesel as a renewable alternative energy. However, the use of homogeneous catalysts, which are difficult to separate, non-reusable, and generate waste, remains a major obstacle. This review aims to examine the potential of dolomite-based heterogeneous catalysts (CaO–MgO) as a more sustainable solution. These catalysts are synthesized through the calcination of dolomite, an abundant carbonate mineral with main components of CaCO₃ and MgCO₃, and can be modified by adding Fe₂O₃, Fe₃O₄, SiO₂, or Na doping to enhance catalytic activity, surface area, and bifunctional properties. Various vegetable oil feedstocks such as Crude Palm Oil (CPO), used cooking oil, tamanu oil, and canola oil have been successfully converted into biodiesel via transesterification (and simultaneous esterification-transesterification) using these catalysts, yielding biodiesel >90% with quality that meets national and international standards. Thus, the synthesis of CaO–MgO catalysts from dolomite promises an effective, economical, and environmentally friendly application for large-scale biodiesel production.
Validation of Ethnochemistry-Integrated Two-Tier Items for Chemical Literacy among Pre-service Chemistry Teachers Ningthias, Dyah Puspitasari; Hidayanti, Ermia; Anwar, Yunita Arian Sani; Listantia, Nora; Firmansyah, Dodiy; Sugondo, Baiq Viona Olganita
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 1 (2026): February 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i1.19581

Abstract

Chemical literacy is an essential competency for preservice chemistry teachers because it supports the ability to understand chemical concepts, interpret chemical information, and apply chemistry in daily and socio-scientific contexts. However, chemical literacy assessment is often limited to conventional multiple-choice tests that do not adequately measure reasoning or contextual application. This study aimed to validate ethnochemistry-integrated two-tier multiple-choice with 10 items test for measuring chemical literacy among preservice chemistry teachers. A quantitative survey design was employed with 35 participants from a public university in West Nusa Tenggara selected through convenience sampling. This approach allowed the researchers to obtain initial empirical evidence on the psychometric quality of the ethnochemistry-integrated two-tier instrument for measuring chemical literacy among pre-service chemistry teachers. The instrument was developed by adapting chemical literacy indicators and integrating local ethnochemical contexts into two-tier items, followed by expert judgment validation. Data were collected through face-to-face, paper-based administration and analyzed using the Rasch measurement model to examine item difficulty calibration, item fit statistics, reliability, separation indices, and unidim The Wright map shows that most pre-service chemistry teachers were clustered around the mean ability range (−1 to +1 logits), indicating moderate chemical literacy, while the items were well distributed in difficulty with more challenging tasks such as Item 8 and Item 4 located at higher logits. Rasch analysis further confirmed acceptable measurement quality, with person reliability of 0.71 and Cronbach’s alpha of 0.74, item fit statistics mostly within the acceptable range (Infit MNSQ 0.78–1.43), and strong unidimensionality evidenced by 40.9% variance explained by the measures.ensionality through residual analysis. This study is novel in validating an ethnochemistry-integrated two-tier multiple-choice instrument using Rasch analysis to provide a culturally responsive and reasoning-based assessment of chemical literacy among pre-service chemistry teachers by connecting chemical concepts with local wisdom and real-life contexts.
Needs Analysis of Redox Reaction E-Module Teaching Material Based on PjBL Integrated with Local Wisdom Pakpahan, Edwin; Silaban, Ramlan; Sianturi, Citra
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 1 (2026): February 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i1.19587

Abstract

This study aims to identify the need for developing a redox reaction e-module based on Project-Based Learning (PjBL) integrated with ethnopedagogy in senior high school chemistry learning. The research addresses the gap between the Merdeka Curriculum’s emphasis on contextual, student-centered learning and the predominantly textbook-oriented instructional practices implemented in classrooms. A descriptive qualitative approach was employed at SMA Negeri 2 Percut Sei Tuan involving one chemistry teacher and 33 twelfth-grade students selected through purposive sampling. Data were collected through teacher interviews, student needs questionnaires, analysis of the Learning Objective Flow (ATP), and evaluation of existing textbooks using BSNP criteria. Quantitative data from questionnaires were analyzed using percentage calculations, while textbook feasibility was assessed using a five-point Likert scale. The findings indicate that 81.81% of students experience difficulties in understanding redox concepts, and learning remains largely expository and textbook-centered. Although the analyzed textbooks achieved a high feasibility score (89.36%, categorized as very suitable), they lack support for project-based, contextual, and ethnopedagogical integration. Furthermore, 96.96% of students expressed the need for interactive electronic learning media integrated with local wisdom. These results confirm the urgency of developing a structured e-module that aligns curriculum standards with active and culturally responsive learning. This study contributes theoretically by providing an empirical and systematic needs-analysis framework as a foundational basis for designing a PjBL-oriented redox e-module integrated with ethnopedagogy, addressing the limited research on culturally contextualized digital chemistry teaching materials.
Green Synthesis of Copper Nanoparticles (CuNPs) using Chaya (Cnidoscolus aconitifolius) Leaves Extract as a Bioreductant Faricha, Yeni Askiyatul; Sutoyo, Suyatno
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 1 (2026): February 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i1.19612

Abstract

Copper nanoparticles (CuNPs) are metallic particles sized 1-100 nm. This study was conducted to develop an ecofriendly and sustainable approach for CuNP synthesis using Cnidoscolus aconitifolius (chaya) leaves extract as a natural bioreductant. The research aimed to determine the optimal synthesis conditions, and characterize the resulting CuNPs. This experimental laboratory study employed a green synthesis method by reducing CuSO₄·5H₂O solution with chaya leaves extract. CuNPs were synthesized at various volume ratios (1:1, 1:2, 1:3, 1:4) and pH values (6-12). Data were collected using instrumental analyses (UV–Vis, FTIR, PSA, and XRD). The obtained data were analyzed descriptively based on spectral, structural, and particle size characteristics. The optimal synthesis condition was achieved at a 1:1 ratio and pH 10, producing CuNPs with a maximum absorption peak at 325 nm, an average particle size of 35.17 nm, and a polydispersity index of 0.2656. FTIR spectra indicated Cu vibrations, while XRD analysis shows the typical 2θ peaks for copper (32.57°, 35.60°, 38.72°, 48.91°, 53.32°, 61.67°, 68.02°, and 72.51°). These findings demonstrate the potential of chaya (Cnidoscolus aconitifolius) leaves extract as a sustainable bioreductant for green synthesis of copper nanoparticles, supporting the development of ecofriendly nanomaterials.

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