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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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Development of Chemistry Learning Performance Assessment Instruments: Systematic Literature Review Hasibuan, Nurhalimah; Ariani, Winda; Nahadi, Nahadi
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 3 (2025): June 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i3.14381

Abstract

Assessments that are generally carried out by teachers usually only focus on cognitive aspects, whereas assessments of cognitive, affective, and psychomotor aspects also need to be carried out. This study aims to develop a performance assessment instrument. Performance assessment is a form of authentic assessment that aims to improve learning and provide constructive feedback to teachers and students. Although it has many benefits, performance assessments are rarely carried out by teachers during learning due to the teacher's limitations in creating performance assessment instruments. Performance assessments can be in the form of product assessments and practice assessments. The research method used follows the PRISMA guidelines, namely by selecting articles from Google Search and Google Scholar. The results of the study showed that out of 121 articles, 9 articles met the criteria for further review. In conclusion, research on the development of performance assessments, especially in the field of chemistry, needs to be further developed. This has implications for the need for more effective developmental performance assessment instruments, especially in Indonesia, so that they can meet the needs of the current education curriculum.
Evaluating Glycerol's Performance as a Sustainable Dehydrator in Ethanol Purification Muhali, Muhali; Hulyadi, Hulyadi; Bayani, Faizul
Hydrogen: Jurnal Kependidikan Kimia Vol. 12 No. 6 (2024): December 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i6.14417

Abstract

This research aims to evaluate the effectiveness of glycerol as a dehydrator in the process of purifying ethanol solutions. This study is a quantitative descriptive research aimed at analyzing the effectiveness of glycerol, derived from used cooking oil, as a water dehydrating agent in the ethanol purification process. Data obtained will be quantitative and statistically analyzed to evaluate glycerol's performance as a dehydrator. The research was conducted at the Chemistry Laboratory of Mandalika Education University (UNDIKMA) over a specific period according to the research schedule.Independent Variable is glycerol from used cooking oil as a dehydrating agent. The concentration of glycerol used is determined based on the percentage of glycerol in the ethanol solution. Dependent variable the effectiveness of ethanol purification, measured through the comparison of density and percentage of standard bioethanol and Controlled variables is Temperature and pressure during the dehydration process, duration of the purification process, and the initial ethanol concentration before purification. Data analysis uses a simple regression curve that follows Lambert Beer's law. In conclusion, the results obtained (increasing the ethanol concentration to 90.5%) show that glycerol is a very effective dehydrator in reducing water content, especially for solutions with high water content such as ethanol at an initial concentration of 23.3%.
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.
Characterization of Activated Carbon from Mangosteen Peel (Garcinia Mangostana L.) Activated with Phosphoric Acid (H3PO4) Indrastika, Erwin Riski; Hidayati, Nasrul Rofiah; Trisnawati, Ade
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.v13i1.14557

Abstract

Mangosteen peel (Garcinia Mangostana L.) represents a waste that has yet to find widespread application. One effort to increase the economic value of mangosteen rind is by processing mangosteen rind into active carbon, which can be used in various industrial processes. This research will examine the manufacture of activated carbon using mangosteen peel as raw material, which is washed clean, cut, and dried, then carbonized using a furnace at a temperature of 250 0C for 1 hour. Activating activated carbon from mangosteen peel is carried out by immersion in a 5 M concentration of phosphoric acid (H₃PO₄). Next, the characteristics of activated carbon from mangosteen peel are examined, including water content, ash content, volatile matter content, and pure carbon content. The study shows that activated carbon meets the SNI-06-3730-1995 standards for its water content (2.76%), ash content (7.24%), volatile matter content (6.02%), and pure carbon content (83.98%).
The Effectiveness of the Case Method in Promoting Meaningful Learning and Enhancing Student Learning Outcomes Munawwarah, Munawwarah; Ruslan, Zuhrah Adminira
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.v13i1.14567

Abstract

This study investigates the effectiveness of the case method in fostering meaningful learning and improving student learning outcomes. Using a quasi-experimental one-group pretest-posttest design, 20 chemistry education students participated in a series of learning activities centered around the case method. Data were collected through pretest and posttest essay assessments and analyzed using descriptive statistics and paired t-tests. Results showed a significant increase in the average student scores from 72.68 (pretest) to 85.21 (posttest), with a reduction in score variability, as evidenced by a t-statistic of -4.28 and a p-value of 0.00045. These findings indicate that the case method effectively enhances student understanding and promotes meaningful learning by engaging students in contextual problem-solving activities. This method aligns with constructivist learning theory and supports the development of essential skills such as critical thinking, collaboration, and the application of theoretical knowledge in practical contexts. Furthermore, its universal applicability across various disciplines highlights its potential to enhance educational practices. Future research should explore long-term impacts, optimize case selection, and examine integration with educational technologies.
A Literature Review: Antimicrobial Phenolic Compounds in Nutmeg (Myristica fragrans Houtt) Ipaenin, Jahiria; Chabib, Lutfi; Hasnaeni, Hasnaeni; Tunny, Risman
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.v13i1.14583

Abstract

In various countries, testing of phenolic compounds in plants is always carried out because these compounds have various health benefits such as antioxidant, anti-inflammatory, and antimicrobial activities. The types of medicinal plants in Indonesia are known to be very diverse where those included in the medicinal plant group reach more than 1000 species, one of which is nutmeg (Myristica fragrans Houtt.) Nutmeg (Myristica fragrans Houtt.) itself is native to the Maluku Islands, Indonesia. However, besides the Moluccas, nutmeg is also cultivated in several other tropical countries. The main objective of this literature review is to critically examine the antimicrobial properties and identify the specific antimicrobial components of phenolic compounds contained in nutmeg (Myristica fragrans Houtt.) The methodology used in this study involved a comprehensive literature review by utilizing reputable academic databases such as Google Scholar, PubMed, and Science Direct related to articles published between 2019 and 2024. The results of this study were obtained through a thorough search process, resulting in eight articles that were considered to meet the established inclusion criteria. A number of articles showed the effectiveness of nutmeg as an antimicrobial because nutmeg contains phenolic compounds that have antibacterial and antifungal properties, which make it effective as an antimicrobial agent. Therefore, with a more comprehensive understanding of the content of phenolic compounds and their mechanism of action, nutmeg can be a further basis for study in the health sector and the pharmaceutical industry.
The Electrical Behaviour Study on Saltwater Batteries in Various Electrolyte Concentrations and Cross-Sectional Areas Anisa, Zuffa; Mubarokah, Lailatul; Rusdiana SE, Meilisa; Setyaningrum, Dyah
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 2 (2025): April 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i2.14591

Abstract

A study has been conducted to analyze the effect of various electrolyte concentrations and cross-sectional areas on voltage and current in batteries using the galvanic cell method (voltaic cells). This study aims to determine the electrolyte concentration and electrode cross-sectional area that provide optimal effects on voltage, current, and power in batteries. Variations in NaCl electrolyte concentration of 1 M; 3 M; 5 M; 7 M; and 9 M as electrolytes and variations in the cross-sectional area of Cu-Al 5 cm2, 10 cm2, 15 cm2, 20 cm2, 25 cm2 as electrodes. From these tests, the optimal voltage value was obtained at a concentration of 7 M and a cross-sectional area of 25 cm2 with a value of 0.73 V, the optimal current value at a concentration of 7 M and a cross-sectional area of 25 cm2 with a value of 19.99 mA, and the optimal power value at a concentration of 7 M and a cross-sectional area of 25 cm2 with a value of 14.593 mwatts. The larger the cross-sectional area of the electrode, the greater the electrical energy produced. The optimum concentration of electrolyte greatly influences the value of the electrical power produced.
Analysis of Student Misconceptions Using the Three-tier Diagnostic Test on Atomic Structure Class X Material at SMA N 1 Lintau Buo Tustari, Rahma; Herman, Mimi; Sari, Dwivelia Aftika; Mawarnis, Elvy Rahmi; Herman, Hidayat
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.v13i1.14633

Abstract

This research is motivated by the number of students who experience misconceptions so that they are not successful in chemistry subjects. This study aims to determine the misconceptions that occur in class X students at SMA N 1 Lintau Buo using a three-tier diagnostic test on atomic structure material. In this study using a qualitative approach (descriptive) method. The subjects of this study were class X students with a total of 108 people. The instruments used are the main instrument (the researcher himself) and supporting instruments, namely the three-tier diagnostic test, interviews, observation and documentation. Data validity testing was carried out by increasing persistence and data triangulation. Furthermore, the data analysis technique uses the classification of student answers from the three-tier diagnostic test, then a percentage is obtained based on the atomic structure sub-matter which is grouped into categories of conceptual understanding, misconceptions and not conceptual understanding. Based on the research that has been done, it can be concluded that the results of the analysis of student misconceptions using the three-tier diagnostic test on class X atomic structure material at SMA N 1 Lintau Buo “are that there are two sub-matter of atomic structure with misconceptions with high criteria, namely in the sub-matter of atomic notation based on the number of protons, neutrons and electrons by 69% and sub-matter of isotopes, isobars and isotones by 62%. For the overall atomic structure sub-matter, the average in the concept understanding category is 36% medium criteria, the misconception category is 55.6% medium criteria and the category does not understand the concept of 8.4% low criteria.
Adsorption of Nitrite (NO2-) Using Natural Zeolite and Natural Zeolite Modified with Cetyl Trimethylammonium Bromide (CTAB) Hanan, Ihsan Sofyan; Hakim, Muhammad Fahmi Hakim; Pambudi, Teguh
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.v13i1.14643

Abstract

Nitrite contamination in water is a critical environmental and public health concern due to its toxicity and persistence. This study investigates the adsorption of nitrite using activated natural zeolite and CTAB-modified zeolite through batch experiments. Natural zeolite was activated with 1M HCl to enhance its surface area, while modification with cetyl trimethylammonium bromide (CTAB) was performed to improve anion adsorption capacity. Adsorption experiments were conducted at different pH levels (2, 4, 6, 8) and contact times (10–90 minutes) using a 100 ppm nitrite solution, with 0.2 g of adsorbent in 50 mL solution. Residual nitrite concentrations were analyzed using UV-Vis spectrophotometry. The results showed that the optimum pH for activated zeolite was 4, with a residual nitrite concentration of 0.108 mg/L, whereas CTAB-modified zeolite performed best at pH 2, reducing nitrite to 0.005 mg/L. The optimal adsorption times were 60 minutes for activated zeolite (0.0106 mg/g) and 75 minutes for CTAB-modified zeolite (0.0156 mg/g). Kinetic analysis indicated that activated zeolite followed a pseudo-first-order model (R² = 0.950), while CTAB-modified zeolite was influenced by intraparticle diffusion (R² = 0.764). These findings highlight the potential of zeolites as efficient and cost-effective adsorbents for nitrite removal in wastewater treatment.
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.

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