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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 618 Documents
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Antioxidant of Ethanol Extract and Toxicity of Fractions from Aspergillus unguis a Marine Sponge Symbiont of Aaptos suberitoides Masyerli, Scify Bilqis Nawafi; Efdi, Mai; Bashari, Muhammad Hasan; Untung Kurnia Agung, Mochamad; Subhan, Beginer; Efahmi, Efahmi; Andriani, Yosie; Syafrizayanti, Syafrizayanti
Hydrogen: Jurnal Kependidikan Kimia Vol 13, No 1 (2025): February 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i1.14645

Abstract

The marine sponge Aaptos suberitoides has been shown to have anticancer properties, with clear evidence of its capacity to suppress the growth of cancer cells. However, the pharmaceutical exploration of chemicals from marine organisms causes significant environmental concerns. Aspergillus unguis, a fungal symbiont of the marine sponge A. suberitoides, has been isolated for its potential in sustainable natural products resources. This study assesses the antioxidant activity of ethanol extract and the toxicity of four levels fractions from ethanol extracts of A. unguis mycelium and these results were reported for the first time in this study. The antioxidant of ethanol extract was determined using the 2,2-Diphenyl-1-picrylhydrazyl (DPPH) method. The fractions were examined for toxicity using the Brine Shrimp Lethality Test (BSLT). The ethanol extract of A. unguis shows very strong antioxidant bioactivity (IC50 = 42.84 mg/L). The LC50 values for hexane, chloroform, ethyl acetate, and butanol fractions were determined to be 74.11 µg/mL, 93.84 µg/mL, 59.37 µg/mL, and 142.79 µg/mL, respectively. It indicates significant toxicity. These preliminary results are important knowledge for further research into the bioactivity potential of the metabolites as candidate anticancer compounds, aligning with marine pharmaceutical drug development.
Analysis of Students Scientific Literacy in Integrated Acid-Base Learning Socioscientific Issues Haryanto, Robby; Rahmawati, Yuli; Saputra, Irwan
Hydrogen: Jurnal Kependidikan Kimia Vol 13, No 1 (2025): February 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i1.14305

Abstract

This study aims to obtain the profile of students' scientific literacy in acid-base learning through the integration of socioscientific issues. The study was conducted on grade 11 students of SMA Negeri 33 Jakarta. The research methodology used was qualitative. Research data were obtained through observation, reflection journals, science literacy tests, student worksheets, and interviews. The socioscientific issues approach begins with introducing acid-base issues, introducing concepts, playing roles, and learning reflections. The results of the study showed that students can develop their ability to express opinions and foster concern for environmental conditions. The profile of students' scientific literacy is quite good in terms of knowledge and competence. In terms of context, most students are at the scientific illiteracy and nominal scientific literacy levels. Based on the results of the science literacy test, the majority of students are at the scientific illiteracy and nominal scientific literacy levels.
Analysis of the Implementation of Formative Assessment on Students' Conceptual Understanding in Chemistry Learning Nisrina, Putri; Primawati, Rizka Indah; Nahadi, Nahadi
Hydrogen: Jurnal Kependidikan Kimia Vol 13, No 1 (2025): February 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i1.14367

Abstract

Formative assessment strategies in chemistry classrooms are essential for enhancing learning, identifying misconceptions, increasing student engagement, promoting metacognition, and supporting differentiation in the classroom. This study employs a systematic literature review (SLR) method to examine formative assessment strategies in high school chemistry classes. The review process follows the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Eleven articles were assessed using the Mixed Methods Appraisal Tool (MMAT), focusing on empirical studies published between 2019 and 2023. The article selection process utilized two databases: Scopus and Google Scholar. The key findings identified four main themes related to formative assessment in chemistry classrooms: implementation effectiveness, relationships, technology, and challenges. Further research recommendations include exploring various formative assessment methods and integrating innovative assessment tools with technology to enhance self-assessment and improve student outcomes.
Application of Silica Adsorbent Rice Husk Ash-Activated Carbon in Refining Waste Cooking Oil Gala, Donna Sumarni; Rahmanpiu, Rahmanpiu; Mulyana, Wa Ode
Hydrogen: Jurnal Kependidikan Kimia Vol 13, No 1 (2025): February 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i1.14802

Abstract

A study has been conducted on “Application of Silica Adsorbent Rice Husk Ash-Activated Carbon in Refining Waste Cooking Oil”. This study aims to describe the comparison of silica-activated carbon composite in refining waste cooking oil and describe the optimum time of silica-activated carbon composite in refining waste cooking oil. The sample in this study was waste cooking oil from fried geprek chicken which was fried 5 times. While the adsorbent used was silica composite from rice husk ash and activated carbon. The method used in this study was adsorption. The stages in this study consisted of four stages, namely silica extraction from rice husk ash, making silica-activated carbon adsorbent composite, silica-activated carbon composite ratio (30:70; 40:60; 50:50; 60:40; and 70:30), and time variations, namely (30, 45, 60, 90) minutes. Silica extraction from rice husk ash using NaOH 12% solution obtained a silica content of 88%. The results of the study of silica-activated carbon composites in the purification of used cooking oil showed that the optimum silica-activated carbon composite adsorbent at a ratio of 60:40 grams and an optimum contact time of 30 minutes obtained a water content of 0.13%, free fatty acids of 0.23% and a peroxide number of 10.92 meq O2/Kg. The results of organoleptic tests with color, odor, and turbidity parameters obtained bright yellow results, less fried chicken odor, and not cloudy.
Calcium Assay of Tuna Bone Waste with Atomic Absorption Spectrophotometer (AAS) Najmah, Najmah; Ramadhani, Andi Indra Wulan Sari; Pagalla, Devi Bunga; Arviani, Arviani; Sangkota, Vivi Dia Afrianti
Hydrogen: Jurnal Kependidikan Kimia Vol 13, No 1 (2025): February 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i1.14705

Abstract

Yellowfin tuna in Gorontalo is very abundant and is often exported outside the region and even abroad as fillets, so yellowfin tuna bones are also very plentiful. The community frequently processes yellowfin tuna bones into kuah asam or namely ilahe. One of the sources of ilahe is Averrhoa bilimbi L., but the leftover tuna bones are only a source of pollution. This research focuses on processing the waste into a product of high nutritional value and highlights the novelty of a more environmentally friendly fish bone calcium extraction method. One of the main novelties of this research is the use of natural materials, namely star fruit, as an alternative for calcium extraction, which reduces dependence on harmful chemicals and supports the principle of sustainability. The extraction method used heat, followed by drying to reduce moisture content, pulverizing (blender) to reduce particle size and sieving. The calcium content in tuna bone meal was then analyzed using the Atomic Absorption Spectroscopy (SSA) method. The results showed that the tuna bone meal was white in colour, and the calcium content was 184.4890 mg/g or 18.45%. This product has the potential to be applied in various fields, such as food, health, animal feed, pellets, and organic fertilizer, as well as a solution to reduce fishery waste and support environmental sustainability.
Analysis of Student Response to the Use of Biochemistry e-Module on Carbohydrate Materials in Enhanching Learning Independence Mairisiska, Titin; Ramadani, Ramadani; Qadariah, Nosi
Hydrogen: Jurnal Kependidikan Kimia Vol 13, No 1 (2025): February 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i1.13929

Abstract

This study aims to analyze student responses to the use of a biochemistry e-module on carbohydrate material and its impact on learning independence. This quantitative descriptive research involved 40 students from the Biology and Chemistry study programs who had used the e-module. Data were collected through a questionnaire covering five indicators: ease of use, effectiveness of material delivery, level of interactivity, learning independence, and general response. The results showed that for the ease of use indicator, the carbohydrate e-module received an average response of "very good" with an average percentage of 83%. The effectiveness of material delivery scored 82.75%, while the level of interactivity reached 85.7%. However, the learning independence indicator had a lower average score (78.7%), indicating the need to strengthen self-learning motivation and encourage further exploration of additional information. The study concludes that the biochemistry e-module on carbohydrate material is effective in enhancing students' understanding but requires some improvements, such as adding a glossary feature and interactive elements to optimally support learning independence. The integration of technology in learning is expected to continue developing to improve the effectiveness of science-based education.
Optimization of Extraction Parameters for Phenolics and Flavonoids from Peony (Paeonia lactiflora) Flowers Using Ultrasound-Assisted Extraction Jasmin, Faida; Handayani, Andi Ika Julianti; Akmal, Tubagus
Hydrogen: Jurnal Kependidikan Kimia Vol 13, No 1 (2025): February 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i1.14346

Abstract

Peony (Paeonia lactiflora) flowers, celebrated for their aesthetic and bioactive attributes, possess potential as natural antioxidant sources owing to their elevated phenolic and flavonoid concentrations. This study employed ultrasound-assisted extraction (UAE) and response surface methodology (RSM) to optimize the extraction parameters for phenolic and flavonoid compounds. The Box-Behnken Design using method Ultrasoud Assisted Extraction determined the optimal extraction parameters of Paeonia lactiflora flowers to be 49% ethanol concentration, a liquid-to-solid ratio of 50 mL/g, and an extraction time of 22 minutes. The parameters yielded a total phenolic content (TPC) of 205.463 mg GAE/g DW and a total flavonoid content (TFC) of 95.465 mg QE/g DW. The results underscore the significance of the liquid-to-solid ratio as a critical factor in extraction efficiency, while ethanol concentration and extraction duration exhibited considerable interactive effects. The findings confirm the efficacy of UAE as a sustainable and efficient technique for extracting bioactive components from Paeonia lactiflora, indicating its potential use in pharmaceuticals and nutraceuticals. Future research should explore the antioxidant activity and IC50 values of these extracts for expanded therapeutic use.
Profile of Critical Thinking Skills and Cultural Literacy of Students in the Basic Chemistry Course Khaeruman, Khaeruman; Suma, Ketut; Maryam, Siti; Suastra, I Wayan; Nurhidayati, Siti
Hydrogen: Jurnal Kependidikan Kimia Vol 13, No 1 (2025): February 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i1.14515

Abstract

This study investigates the profile of critical thinking skills and cultural literacy among students in the Basic Chemistry course at the Faculty of Science, Technology, and Applied Sciences, Universitas Pendidikan Mandalika. In the context of globalization and rapid technological advancements, critical thinking and cultural literacy are crucial competencies for facing the challenges of the 21st century and the Fourth Industrial Revolution. Despite the foundational importance of Basic Chemistry in science education, challenges such as conceptual complexity and low student engagement remain prevalent. Employing a descriptive quantitative approach, this research involves students from Chemistry, Biology, Physics, and Mathematics Education programs. Instruments used include critical thinking tests and cultural literacy questionnaires measuring understanding of local cultural values and diversity. Data were collected through tests, questionnaires, and semi-structured interviews and analyzed descriptively using statistical methods. Findings reveal that students exhibit low levels of critical thinking skills and cultural literacy, with strengths in data interpretation and cultural preservation, while weaknesses are evident in identifying relevant information and cultural promotion. These results highlight the need for innovative instructional models integrating local wisdom into the learning process. The proposed Free Inquiry-Based Etnochemistry Model aims to enhance both critical thinking skills and cultural literacy by contextualizing scientific concepts within local cultural practices, offering a holistic solution to contemporary educational demands.
Development of Interactive Learning Media Based on a 2-Dimensional Virtual Laboratory on Electrochemical Materials Joko, Neneng Andriani; Rudi, La; Arsyad, Muhammad
Hydrogen: Jurnal Kependidikan Kimia Vol 13, No 1 (2025): February 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i1.14853

Abstract

This study aims to analyze the feasibility of interactive learning media based on a 2D virtual laboratory for electrochemistry material and to examine students' responses to its use. The media was designed as a solution to address the limitations of laboratory equipment and materials often encountered in schools. The research method employed was Research and Development (R&D) using the ADDIE development model (Analysis, Design, Development, Implementation, Evaluation). The media’s validity was analyzed using Aiken’s V content validity, involving three expert validators. The results of the analysis indicated a validity score of 0.86, which falls into the high category, demonstrating that the media is feasible for use. Student responses to the media were also analyzed, yielding an overall quality percentage of 75.98%, classified as good. Based on these findings, the learning media is considered effective and applicable in the teaching and learning process for electrochemistry materials to enhance students' conceptual understanding and practical skills.
The Influence of Learning Independence and Learning Styles on the Chemistry Achievement of 11th-Grade Students at SMAN 2 Pasarwajo Dahlan, Dahlan; Nurlansi, Nurlansi; Susilawati, Lastri
Hydrogen: Jurnal Kependidikan Kimia Vol 13, No 1 (2025): February 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i1.14754

Abstract

This study aimed to describe students' learning independence, learning styles, and  analyze their influence on chemistry learning achievement. The population as well as sample in this study were 42 students from classes XI.C and XI.D SMA Negeri 2 Pasarwajo in the 2024/2025 academic year. Questionnaire was used to obtain data of learning independence and learning styles, while learning achievement was obtained from semester test scores. Techniques of data analysis employed were descriptive and inferential statistical analysis, namely multiple linear regression analysis using dummy variables. The results showed that students' learning independence was in the moderate category (85.71%). Students' learning styles consisted of visual (21.43%), auditory (14.28%), kinesthetic (21.43%), and other combined styles. Meanwhile, students' learning achievement was in the moderate category (80.95%). Learning independence and learning styles influenced the chemistry learning achievement, both partially and simultaneously. Partially, learning independence contributed 35.3% and learning style namely visual, auditory, and kinesthetic sequentially contributed 19.9%, 10.4%, and 7.3%. Simultaneously, they contributed 72.9% to chemistry learning achievement.

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