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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 721 Documents
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Development of Laboratory Virtual Learning Media on Alkene Submaterial Jovita Tia Br Pakpahan; Marham Sitorus; Manihar Situmorang; Ratu Evina Dibyantini; Marudut Sinaga
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.20980

Abstract

This study aims to develop virtual laboratory learning media for the alkenes subtopic and determine the feasibility, practicality, and effectiveness of its use in chemistry learning. This study used the Research and Development (R&D) method with the ADDIE model, which includes the stages of analysis, design, development, implementation, and evaluation. The study was conducted in the Chemistry Education Study Program, State University of Medan, with students from class PSPK 25 C as the experimental class and class PSPK 25 E as the control class. The research instruments consisted of validation sheets from media experts and material experts, student response questionnaires, and learning outcome tests in the form of pretests and posttests. Data were analyzed descriptively quantitatively using percentages and N-Gain calculations. The results showed that the virtual laboratory media achieved a media feasibility percentage of 83.93% and a material feasibility percentage of 83.67%, categorized as very feasible. The media's practicality level reached 86.24%, categorized as very practical. The effectiveness test results showed that the experimental class achieved an N-Gain score of 0.80, categorized as high, while the control class achieved an N-Gain score of 0.67, categorized as moderate. Based on the research findings, the developed virtual laboratory media is effective for learning the alkenes subtopic.
Effect of Glycerol Addition as an Entrainer in Extractive Distillation for Bioethanol Purification from White Glutinous Rice Fermentation Zuinan Dakwa; Yeti Kurniasih; Hulyadi; Yusran Khery
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.20996

Abstract

Bioethanol is a renewable liquid fuel that can be produced from carbohydrate-rich biomass, including white glutinous rice (Oryza sativa var. glutinosa). However, fermentation-derived bioethanol typically contains a high proportion of water; therefore, further purification is required to improve its suitability for fuel or industrial applications. This study investigated the effect of glycerol addition as a high-boiling and hygroscopic entrainer in the extractive distillation of bioethanol produced from white glutinous rice fermentation. A quantitative laboratory experiment was conducted using 200 mL bioethanol samples with varying glycerol volumes of 0, 10, 30, 40, 50, 60, and 70 mL. The ethanol concentration in the distillate was determined based on density measurements using a pycnometer and a calibration curve prepared from ethanol standard solutions. The calibration curve demonstrated a strong linear relationship between ethanol concentration and density, expressed as ρ = −0.0017C + 1.0057, with an R² value of 0.9931. The results showed that glycerol addition increased the apparent ethanol concentration of the distillate compared with the control sample. The highest ethanol concentration was obtained with the addition of 50 mL glycerol to 200 mL bioethanol sample, producing a distillate density of 0.9200 g/mL and an ethanol concentration of 50.41%. This value represents an increase of 44.94 percentage points from the initial concentration of 5.47%. However, further increases in glycerol volume reduced the separation efficiency, most likely due to increased viscosity, which may have hindered heat and mass transfer during distillation. These findings indicate that glycerol can enhance bioethanol purification through extractive distillation when applied at an optimum volume ratio. Nevertheless, further dehydration and more rigorous analytical validation are required before the final product can be classified as fuel-grade ethanol.
Green Chemistry Education at the Secondary School Level: A Bibliometric Analysis of Trends and Research Gaps Syahrul Bachtiar; Dwi Ajni Shafarwati
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.21053

Abstract

Green Chemistry Education (GCE) has become increasingly important in supporting sustainability-oriented chemistry learning at the secondary school level. This study aims to map research trends, identify dominant themes, and examine research gaps in GCE through a bibliometric analysis. The final dataset consisted of 43 articles retrieved from the Scopus and Web of Science databases for the period 2016–2025. Data were analyzed using VOSviewer through keyword co-occurrence and thematic mapping. The findings show a growing scholarly interest in GCE, reflecting the increasing relevance of sustainability principles in chemistry education. Keyword analysis indicates that existing studies are mainly centered on students, teachers, education systems, active learning, experimentation, and contextual learning approaches. The thematic development also shows a shift from foundational discussions of green chemistry principles toward curriculum integration, digital learning innovation, ethnochemistry, and alignment with the Sustainable Development Goals (SDGs). Despite this development, several gaps remain, particularly in long-term impact evaluation, students’ behavioral change, teacher preparedness, and interdisciplinary implementation. This study contributes by providing a structured overview of the GCE research landscape in secondary education and by offering directions for educators, policymakers, and researchers to strengthen sustainable chemistry learning.
Liveworksheet-Based E-LAPD to Enhance Students’ Critical Thinking in Chemical Equilibrium Nabila Aulia; Sukarmin
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.21098

Abstract

This study focuses on developing interactive multimedia in the form of a Liveworksheet-based Electronic Student Activity Sheet (E-LAPD) designed to enhance students' critical thinking ability in chemical equilibrium. The research employs Thiagarajan's 4D model (Define, Design, Develop, and Disseminate), limited to the Develop stage. The study evaluates the E-LAPD's validity, practicality, and effectiveness. Validity was assessed by three experts using a Likert scale through content and construct validation, with results indicating that the E-LAPD met valid criteria across all assessed aspects. Practicality was determined through quantitative descriptive analysis of student response questionnaires and activity observation sheets, demonstrating a very practical rating supported by consistently high relevant student activity percentages across three sessions. Effectiveness was measured using N-Gain scores and a paired-sample t-test comparing pretest and posttest critical thinking scores, which revealed statistically significant improvement with N-Gain scores ranging across moderate-to-high categories. These outcomes collectively affirm that the Liveworksheet-based E-LAPD is a valid, practical, and effective learning tool. The guided inquiry approach integrated into the E-LAPD promotes active student engagement and fosters the development of critical thinking across all indicators, underscoring its strong potential as an innovative instructional medium for advancing higher-order thinking skills in chemistry education.
Think Pair Share-Based Learning Module for Global Warming in Grade X Chemistry Sishy Maharani Putri; Mimi Herman
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.21112

Abstract

Teaching materials play an important role in helping students understand chemistry concepts. However, the teaching materials commonly used in schools are often limited to textbooks, which may not effectively facilitate the learning of abstract concepts such as global warming. This study aimed to develop a Think Pair Share (TPS)-based learning module on global warming for Grade X chemistry students and to evaluate its validity and practicality. The study employed a Research and Development (R&D) approach using the 4-D model, consisting of define, design, develop, and disseminate stages. The research involved one chemistry teacher and 64 Grade X students of SMAN 1 Pariangan. Data were collected through validation sheets and practicality questionnaires and analyzed descriptively using percentage analysis. The results showed that the developed module met the criteria of valid and very valid in terms of content, construct, and language aspects. In addition, the module was categorized as very practical based on both teacher and student responses. These findings indicate that the TPS-based learning module is suitable for use in chemistry learning and can serve as an alternative teaching material to enhance students’ understanding of global warming concepts while promoting active learning.
Effect of Discovery Learning on Student’s Achievement in Acid-Base Chemistry Mimi Herman; Naya Eliya Putri; Dwivelia Aftika Sari
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.21113

Abstract

This study aimed to determine the effect of the Discovery Learning model on students’ learning outcomes in acid-base material at SMAN 1 Sungai Tarab. The research employed a quasi experimental method using a nonequivalent control group design. The sample consisted of 45 students selected through a total sampling technique. Data were collected through observation, documentation, and learning achievement tests. The findings showed that students who learned through the Discovery Learning model achieved higher learning outcomes than those who received conventional instruction. Hypothesis testing indicated that the implementation of the Discovery Learning model had a significant effect on students’ learning outcomes in acid-base material. These findings suggest that Discovery Learning can be used as an effective instructional alternative to enhance students’ engagement and conceptual understanding in chemistry learning, particularly in acid-base topics.
Effect of Zeolite Pre-Treatment on the Performance of a 7-Hole Catalytic Converter Nur Fauziah; Yesi Angelia Simarmata; Iis Siti Jahro
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.21118

Abstract

Rice husk ash is a promising silica source for zeolite X synthesis; however, studies comparing different pretreatment methods and their influence on catalytic converter performance remain limited. This study investigated the effect of bleaching and magnetic separation pretreatments on the properties of zeolite X synthesized from rice husk ash and its application in a 7-hole catalytic converter for vehicle exhaust emission reduction. The synthesized zeolite was characterized using XRF, FTIR, XRD, and SEM, while catalytic performance was evaluated based on changes in exhaust gas composition. Both pretreatment methods successfully produced zeolite X with SiO₂ and Al₂O₃ as the main framework components. However, bleaching pretreatment produced zeolite with higher crystallinity (73.39%), better crystal morphology, and a more favorable Si/Al ratio than magnetic separation. When applied in a 7-hole catalytic converter, the bleached zeolite achieved higher reductions of CO, HC, and CO₂ emissions by 65.50%, 67.07%, and 77.55%, respectively, compared to 51.61%, 69.95%, and 38.04% for the magnetic separation zeolite. These findings demonstrate that the pretreatment method significantly affects zeolite quality and catalytic converter performance, with bleaching pretreatment showing superior effectiveness for exhaust emission reduction.
Vegetable Oils and Hibiscus rosa-sinensis Leaf Extract in Solid Soap Formulation Marliandi Tamo Ama; Ahmadi; Hulyadi; Baiq Risni Maripa; Yusran Khery
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.21188

Abstract

This study identified the effects of vegetable oil formulation and Hibiscus rosa-sinensis leaf extract concentration on the physicochemical quality of laboratory-scale solid soap. A 3 x 4 factorial design was used, consisting of three oil bases (A1, A2, and A3) prepared from coconut, olive, and palm oils and four extract concentrations (0, 1, 2, and 3%). The measured parameters were pH, moisture content, foam height, foam stability, organoleptic acceptance, and UV-Vis maximum wavelength of selected extract-containing soaps. The pH of all samples ranged from 9.00 to 9.43, indicating an alkaline soap system consistent with saponification. Moisture content varied from 11.00 to 19.00%; several samples met the 15% moisture criterion, while F1 and F4 exceeded it. Foam stability ranged from 74.96 to 88.89%, and foam height ranged from 0.33 to 1.33 cm. The A3 oil base showed the lowest mean moisture content (12.33%) and the highest mean foam stability (84.77%). Organoleptic evaluation indicated that F5 was the most preferred sample, whereas F11 was selected as the strongest technical candidate because it contained 2% extract, had the lowest moisture content, and showed the highest foam stability. UV-Vis analysis of A3 extract-containing soaps showed lambda max values of 374-377 nm with absorbance values of 0.747-0.751, supporting the persistence of flavonoid-related absorption in the soap matrix. The findings indicate that vegetable oil composition and H. rosa-sinensis leaf extract concentration influence solid soap quality and should be optimized jointly.
NiAl₂O₄ -Modified Glassy Carbon Electrode From Napa Soil For Pb²⁺ Ions Using Voltammetry Zsa Zsa Fitria Alizar; Mawardi Mawardi; Alizar Ulianas; Syamsi Aini; Okta Suryani
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.21254

Abstract

Lead (Pb²⁺) is a toxic heavy metal that poses serious risks to environmental and human health, creating a need for sensitive and reliable detection methods. This study aimed to develop a glassy carbon electrode (GCE) modified with NiAl₂O₄ derived from Napa soil for the electrochemical detection of Pb²⁺ ions using voltammetric techniques. The electrochemical performance of the modified electrode was evaluated by cyclic voltammetry in 4 mM K₃[Fe(CN)₆] containing 0,1 M KCl. The results showed that the NiAl₂O₄-modified GCE exhibited enhanced electrochemical activity compared with the bare GCE, as indicated by an increase in anodic peak current from 19.93 μA to 26.60 μA (33.5%) and cathodic peak current from 19.03 μA to 24.29 μA (27.6%), reflecting improved electron-transfer capability and a larger electroactive surface area. The modified electrode successfully detected Pb²⁺ ions, producing well-defined oxidation and reduction peaks at −0.32 V and −0.52 V, respectively. Among the supporting electrolytes investigated, 0,1 M KCl provided the highest current response, and increasing the KCl concentration from 0.05 M to 0,10 M further enhanced the electrochemical signal. In addition, the electrode demonstrated good stability during repeated measurements. These findings indicate that the NiAl₂O₄-modified GCE based on Napa soil is a promising, low-cost, and sensitive electrochemical sensor for Pb²⁺ detection with improved electrochemical performance.
Napa Soil-Derived NiAl₂O₄/MWCNT-Modified Glassy Carbon Electrode for Cd²⁺ Detection Stevy Dara Ayu; Mawardi Mawardi; Hary Sanjaya; Sherly Kasuma Warda Ningsih; Okta Suryani
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.21268

Abstract

Cadmium ions (Cd²⁺) are toxic environmental pollutants that require sensitive and reliable detection methods. This study aimed to develop a NiAl₂O₄/MWCNT-modified glassy carbon electrode (GCE) using NiAl₂O₄ synthesized from napa soil as a sustainable local resource for electrochemical Cd²⁺ detection. The electrode was fabricated through a drop-casting method and characterized using cyclic voltammetry. The electrochemical performance of the modified electrode was evaluated for Cd²⁺ detection, including the effects of supporting electrolytes, stability, and analytical performance. The results showed that the incorporation of NiAl₂O₄ and multi-walled carbon nanotubes significantly enhanced the electrochemical response and electron-transfer kinetics compared with the bare GCE. Among the tested electrolytes, 0.1 M KCl provided the highest current response. The sensor exhibited a linear response toward Cd²⁺ concentrations in the range of 1–4 mM with a regression equation of y = 14.332x + 39.895 and a correlation coefficient (R²) of 0.9941. The limit of detection (LOD) and limit of quantification (LOQ) were calculated as 0.2988 mM and 0.9961 mM, respectively. In addition, the electrode demonstrated good stability during repeated measurements. These findings indicate that the napa soil-derived NiAl₂O₄/MWCNT-modified GCE is a promising, low-cost, and environmentally sustainable platform for Cd²⁺ monitoring.

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