Hydrogen: Jurnal Kependidikan Kimia
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.
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<![CDATA[Development of Video Tutorials for Simple Distillation Tools for Making Essential Oils in Junior High Chemistry Course ]]>
<![CDATA[Listra, Irene Yudea]]>;
<![CDATA[Hairida, Hairida]]>;
<![CDATA[Rasmawan, Rahmat]]>;
<![CDATA[Enawaty, Eny]]>;
<![CDATA[Masriani, Masriani]]>
<![CDATA[ Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024 ]]>
Publisher : <![CDATA[Universitas Pendidikan Mandalika ]]>
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DOI: 10.33394/hjkk.v12i3.11752
<![CDATA[This study aims to develop a video tutorial for simple distillation equipment for making essential oils that is suitable for use in junior high school chemistry courses. The research is a development research using the Design Thinking approach. The Design Thinking approach includes five steps, namely: empathic, definition, idea, prototype, and test. The instruments used in this study are student response questionnaires and validity on video tutorials for simple distillation equipment for making essential oils. The results of validation and student response to the video were analyzed using a Guttman scale and obtained a percentage of validation of the feasibility of media design 100% with a very valid category, articulation and intonation 100% with a very valid category, operation 100% with a very valid category, and suitability of material with sub-CPMK 100% with a very valid category. The percentage in the response test, namely the media display indicator 96.8% with a very good category, 100% operation with a very good category, and 98.95% usefulness with a very good category. Thus it can be concluded that the results of the analysis of video tutorial development are worth testing in the learning process.]]>
<![CDATA[Characterization of Activated Charcoal Produced Using Green Chemistry Principle Approach Number 7 ]]>
<![CDATA[Thohir, Muhammad Bakhru]]>;
<![CDATA[Wijaya, Terry Esi Putri]]>
<![CDATA[ Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024 ]]>
Publisher : <![CDATA[Universitas Pendidikan Mandalika ]]>
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DOI: 10.33394/hjkk.v12i3.11834
<![CDATA[Charcoal is an important component in the effort to provide clean water. One of the water qualities that need to be considered is the level of hardness. Reducing the level of hardness can be done with activated charcoal. The production of activated charcoal uses many synthetic materials. Therefore, aim of research is to produce, test the performance, and characterization of activated charcoal made with natural acids. The stages of this research are charcoal preparation and natural acid activator, carbonization, activation with natural acids (Averrhoa bilimbi L. and Citrus aurantifolia S.), and characterization. The production results were tested for adsorbing ability and characterization using FTIR, SEM, and XRD to determine the functional groups, structure, and components. The results showed that activated charcoal produced using natural acids had better performance in adsorbing. Characterization with FTIR showed the absorption of C-H functional groups shown at 785 cm-1, 1100 cm-1 for C-O functional groups, 3368 cm-1 for O-H stretching vibration groups. Typical active charcoal groups were also detected at wave numbers 1704 cm-1for C=O functional groups and 1575 cm-1 for C=C groups. Characterization with XRD showed the same pattern between charcoal produced with natural acids and the control. SEM images showed clear pores on the surface of the activated charcoal. Thus, natural acids can really be a candidate for activator replacement in the production of activated charcoal that applies the principles of green chemistry.]]>
<![CDATA[Effect of Brix Concentration and pH of Molassses Media on Ethanol Yield in The Fermentation Process at PT. Indo Acidatama. Tbk ]]>
<![CDATA[Hutapea, Henny Parida]]>;
<![CDATA[Ahmadi, Panji]]>
<![CDATA[ Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024 ]]>
Publisher : <![CDATA[Universitas Pendidikan Mandalika ]]>
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DOI: 10.33394/hjkk.v12i3.11668
<![CDATA[PT. Indo Acidatama Tbk. is a company that produces ethanol. Ethanol is produced by fermentation using molasses derived from sugar processing waste. To get the optimal ethanol content, it can be determined from the yield produced, it is necessary to have effectiveness in the fermentation process. In this experiment, the fermentation process was carried out with variations in molasses concentration and pH. The aim was to determine the combination of brix concentration and molasses pH in producing the most effective ethanol yield. The concentration of molasses used was 16 obrix, 20 obrix and 24 obrix. While the pH used was 4, 5 and 6. In the determination of the ethanol content, the separation was carried out by a distillation process, then the distilled ethanol was tested using a spindle alcoholmeter and a chromatographic test was carried out using a Gas Chromatography type 6890N. After getting the ethanol content, the next step is to determine the yield by using the alcohol content calculation. The results of the chromatography test obtained samples of 24 obrix variations and pH 4, getting the highest concentration, which was 3.05%. From the calculation of alcohol content, the sample variation of 16 obrix and pH 5 got the highest yield value, with an average of 26.74. From the results of the Two-Way ANOVA calculation, it was found that obrix and pH had a significant effect on ethanol yield.]]>
<![CDATA[Development Of Teaching Material To Support Merdeka Curriculum On Stoichiometry For Phase F ]]>
<![CDATA[Damiyanti, Damiyanti]]>;
<![CDATA[Mawardi, Mawardi]]>;
<![CDATA[Suryani, Okta]]>
<![CDATA[ Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024 ]]>
Publisher : <![CDATA[Universitas Pendidikan Mandalika ]]>
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DOI: 10.33394/hjkk.v12i3.11687
<![CDATA[This study aims to develop teaching materials to support merdeka curriculum learning on stoichiometry material phase F SMA / MA. This research uses the Eduactional Design Research (EDR) method with the Plomp development model which consists of three stages, namely the preliminary research stage, the development or prototyping phase, and the trial and assessment phase. Data collection was carried out using validity and practicality questionnaires. The subjects of this study were three chemistry lecturers, two chemistry teachers and nine students with high, medium and low ability levels. The validity questionnaire was given to three chemistry lecturers and two chemistry teachers while the practicality questionnaire was given to two chemistry teachers and nine students. The results showed that the validity test obtained a validity value of 88% which was declared a valid category. While the results of the practicality test for chemistry teachers obtained a value of 91% which was declared a very practical category and the results for students obtained a value of 93% which was declared a very practical category. Based on the results of the study, it was found that the development of teaching materials to support merdeka curriculum learning in SMA/MA phase F stoichiometry material was valid and practical]]>
<![CDATA[Kinetics of Tofu Pulp as Copper Metal Adsorbent on the Waste of the Silver Craft Industry ]]>
<![CDATA[Indah, Dahlia Rosma]]>;
<![CDATA[Hatimah, Husnul]]>
<![CDATA[ Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024 ]]>
Publisher : <![CDATA[Universitas Pendidikan Mandalika ]]>
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DOI: 10.33394/hjkk.v12i3.12462
<![CDATA[Liquid waste originating from the silver crafts industry is heavy metal waste that is dangerous for the surrounding environment, one of which is copper (Cu). Copper is a heavy metal that can have toxic effects on human health. Based on these problems, processing is needed to reduce the pollutants produced. One of the technologies used is adsorption using a natural adsorbent that is efficient and easy to obtain, namely tofu dregs. Adsorption using tofu dregs is because tofu contains protein. This protein has the ability to absorb amino acids which form two charged ions (zwitter ions). Toxic metals can be bound to proteins as metallothionein. This research aims to determine the efficiency of using tofu dregs as an absorbent for copper metal (Cu) and to determine the effect of contact time and adsorption isotherms on copper metal adsorption. 1 gram of tofu dregs was used with 25 ml of waste and then contacted with a magnetic plate stirrer at varying times of 30, 60, 90, 120 and 150 minutes. The concentrations of all copper metals were analyzed using an Atomic Absorption Spectrophotometer. Next, each copper metal content was calculated using a copper metal standard calibration curve. Identification using an Infrared Spectrophotometer showed that the tofu dregs waste in this study contained the functional groups -OH, N-H (stretching), C-H (aliphatic), C=O, -OH (bending vibration), and C-O. From the research it was found that the copper metal content in the sample was 19.5979 ppm. The optimum contact time for copper metal adsorption is 120 minutes, which results in an optimum adsorption efficiency for copper metal, namely 54.88%. The isotherm equation that corresponds to the adsorption of copper metal using tofu dregs waste is the Freundlich isotherm with a Kf value of 0.072 L/g and a 1/n value of 2.366. This shows that the adsorption of copper metal occurs in a multilayer layer on the surface of the tofu dregs adsorbent, which illustrates the occurrence of physical adsorption. Tofu dregs waste is an effective adsorbent for reducing copper metal levels in silver craft waste.]]>
<![CDATA[Validity of Electronic Worksheet (E-LKPD) Based on PBL Model to Train Creative Thinking Skills on Acid-Base Material ]]>
<![CDATA[Ainiah, Errisya Nur]]>;
<![CDATA[Yonata, Bertha]]>
<![CDATA[ Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024 ]]>
Publisher : <![CDATA[Universitas Pendidikan Mandalika ]]>
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DOI: 10.33394/hjkk.v12i3.11587
<![CDATA[Creative thinking skills are important to train students to face the challenges of the 21st century and include higher order thinking skills. In addition, the independent curriculum provides freedom to think and innovate in learning. Therefore, one of the efforts to train creative thinking skills is to use relevant learning media, namely E-LKPD based on the Problem Based Learning (PBL) model. The purpose of this research is to produce PBL-based E-LKPD to train the creative thinking skills of grade XI students on acid-base material that is feasible to use, in terms of validity. This research model is guided by Thiagarajan's 4D model (Define, Design, Develop, and Disseminate). However, the research only reached the development stage (Develop) to determine the validity of the product because there were limitations in time, funds, and energy. Validation was conducted by 3 validators to measure the content and construct validity of the developed E-LKPD. The results showed that the validity of the E-LKPD was considered valid based on the median score of content validity of 4 with a valid category and construct validity of 5 with a very valid category.]]>
<![CDATA[The Effectiveness of Interactive E-Modules as Learning Media to Train Visual Spatial Intelligence in Chemical Bond Material ]]>
<![CDATA[Fatmawati, Ria]]>;
<![CDATA[Sukarmin, Sukarmin]]>
<![CDATA[ Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024 ]]>
Publisher : <![CDATA[Universitas Pendidikan Mandalika ]]>
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DOI: 10.33394/hjkk.v12i3.8940
<![CDATA[This study aims to determine the effectiveness of interactive e-module that train students' visual intelligence on chemical bond material. Chemical bond is one of the high school chemistry materials that has basic concepts that must be mastered in order to understand other chemistry topics and abstracts require the ability to understand what must be stimulated. This study was compiled based on the 4D research and development (R&D) model. The subjects and population of this study were students of class XI IPA at SMAN 12 Surabaya. The effectiveness of the review of cognitive domain tests and spatial visual intelligence tests before and after the use of a 3D visualialization base interactive e-module. The analysis of this study used N-gain and normality statistical tests until the data were normally distributed. The effectiveness of the media was stated to be very effective with an N-Gain score on the cognitive test of 0.8 in the high category and the spatial visual intelligence test of 0.8 in the high category which shows the relationship between cognitive domain tests and visual spatial tests can improve understanding of chemical bond material. The results of the research show that it is feasible to implement]]>
<![CDATA[Reducing Coffee Acidity and Caffeine through the Roasting Method using Azadirachtaindica Firewood ]]>
<![CDATA[Putera, Dwi]]>;
<![CDATA[Yamin, Yamin]]>;
<![CDATA[Firdaus, Thoriqi]]>
<![CDATA[ Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024 ]]>
Publisher : <![CDATA[Universitas Pendidikan Mandalika ]]>
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DOI: 10.33394/hjkk.v12i3.12140
<![CDATA[Coffee is known as an acidic drink, so it will make the stomach feel unpleasant. This research compares the roasting method with Azadirachta Indica firewood with machine and manual roasting processes. Each roasting method uses four maturity levels: light roast, medium roast, dark roast, and extra dark roast. The acidity test used a pH meter instrument, and the caffeine test used the spectrophotometric method, which was carried out at the Sucofindo Indonesia laboratory. The one-way ANOVA test analyzed each method's acidity and caffeine results statistically. It can be seen that the sig < 0.05 in one-way ANOVA results for pH (0.006) and caffeine (0.013) coffee tests. So, there are significant differences in the three coffee roasting methods in reducing acidity and caffeine levels at each coffee roasting level. The average results of coffee acidity using the Azadirachta Indica wood roasting method (5.6), machine roasting (5.1), and manual roasting (4.8). The average yield of coffee caffeine with the Azadirachta Indica wood roasting method (2.13), machine roasting (2.55), and manual roasting (2.90). The roasting way using Azadirachta Indica firewood is the most effective, and there is a significant difference in reducing the acidity and caffeine of coffee at each level of coffee roasting. 55), and manual roasting (2.90). The most effective method of roasting is with Azadirachta Indica firewood, and there are significant differences in reducing the acidity and caffeine of coffee at each coffee roasting level. 55), and manual roasting (2.90). The most effective method of roasting is with Azadirachta Indica firewood, and there are significant differences in reducing the acidity and caffeine of coffee at each coffee roasting level.]]>
<![CDATA[Transforming Chemistry Learning through the Development of Higher Order Thinking Based on Revised Bloom's Taxonomy: A Systematic Review ]]>
<![CDATA[Putri, Annisa Khairani]]>;
<![CDATA[Fahrunisa, Allika Haya]]>;
<![CDATA[Evriliani, Agnes Suci]]>;
<![CDATA[Volosa, Erin]]>;
<![CDATA[Nahadi, Nahadi]]>
<![CDATA[ Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024 ]]>
Publisher : <![CDATA[Universitas Pendidikan Mandalika ]]>
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DOI: 10.33394/hjkk.v12i3.12452
<![CDATA[Education is a structured and systematic learning process that aims to improve the knowledge, skills, attitudes and values needed to build a successful career and life. Through education we can produce human resources who are competent and resilient in facing a complex future. The way to produce competent human resources is to improve students' Higher Level Thinking Skills in the learning process. The application of the Revised Bloom's Taxonomy in learning is able to improve students' high-level thinking skills because the revised Bloom's Taxonomy has levels of cognitive abilities starting from low level (LOTS) to high level (HOTS). To find out feedback and student learning outcomes, look at the results of the assessment process after learning. These results can be a reference and even input for teachers to always develop the critical thinking skills learning process. Thus, this article aims to present knowledge information regarding the development of learning high-level thinking skills in chemistry subjects based on the revised Bloom's taxonomy which refers to student assessment. ]]>
<![CDATA[The Effect of Virtual Laboratory on Students' Computational Thinking on Half-Life Concepts ]]>
<![CDATA[Mashami, Ratna Azizah]]>;
<![CDATA[Ahmadi, Ahmadi]]>;
<![CDATA[Hatimah, Husnul]]>
<![CDATA[ Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024 ]]>
Publisher : <![CDATA[Universitas Pendidikan Mandalika ]]>
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DOI: 10.33394/hjkk.v12i3.12107
<![CDATA[This study investigates the impact of virtual laboratories on enhancing students' computational thinking skills, focusing on the half-life concept in radiochemistry. Utilizing a quantitative research approach, a quasi-experimental design with a one-group pretest-posttest model was employed. Thirteen students enrolled in a Radiochemistry course participated in the study. The intervention involved the use of PhET simulations as a virtual laboratory, designed to facilitate a structured and interactive learning environment. Pretest and posttest assessments were conducted to measure the students' computational thinking skills. The results showed significant improvement in computational thinking post-intervention, with notable gains in decomposition, pattern recognition, abstraction, and algorithm design. Statistical analysis using paired-sample t-test and normalized gain scores confirmed the effectiveness of the virtual laboratory in enhancing these skills. The study concludes that virtual laboratories, such as PhET simulations, are effective in developing computational thinking abilities, providing a valuable tool for modern educational practices. These findings suggest that integrating virtual laboratories into the curriculum can significantly improve students' problem-solving and critical thinking skills, preparing them for future academic and professional challenges.]]>
