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[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.]]>
<![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[The Influence of the Anchored Instruction Model assisted by PHET on Students' Problem Solving Abilities ]]>
<![CDATA[Dewi, Bq Intan Patmala]]>;
<![CDATA[Verawati, Ni Nyoman Sri Putu]]>;
<![CDATA[Hikmawati, Hikmawati]]>;
<![CDATA[Rahayu, Satutik]]>
<![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.v12i3.12179
<![CDATA[Abstract This research aims to test the effect of the anchored instruction model assisted by PhET on students' physics problem solving abilities in optical instruments at SMAN 1 Sukamulia. The type of research used is quasi experimental with a pretest-posttest control group design. The population is all students in class XI MIPA SMAN 1 Sukamulia, totaling 52 people. The research sample was taken using a saturated sampling technique and class XI MIPA 1 was selected as the experimental class and class XI MIPA 2 was selected as the control class. The experimental class was treated with an anchored instruction model assisted by PhET and the control class was treated with a direct learning model. The research instrument consists of a problem solving ability test (KPM) in the form of a description test of 10 questions taking into account validity, reliability, level of difficulty and differentiability of questions. The KPM pre-test and post-test data were tested for normality and homogeneity, then continued with hypothesis testing using the twin sample t-test. Hypothesis test results obtained that the calculated t value was greater than the t table, so Ha was accepted, so that the PhET-assisted anchored instruction learning model had an effect on ability. Physics problem solving for students at SMAN 1 Sukamulia.]]>
<![CDATA[Development Problem-BasedLearning Oriented E-worksheet To Train Analytical Skills On Chemical Equilibrium Material ]]>
<![CDATA[Damayanti, Vivi]]>;
<![CDATA[Novita, Dian]]>
<![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.v12i3.12189
<![CDATA[The purpose of this study is to discuss the possibility of using a problem-based learning-oriented e-worksheet to teach students analytical skills on chemical equilibrium material. The feasibility of E-LKPD may be assessed in terms of validity, practicality, and efficacy. The approach employed in this study is Research and Development (R&D), utilizing the 4D development process derived by Tiagharajan, which covers Define, Design, Develop, and Disseminate. Based on the findings of the research, the e-worksheet earned mode 3 on the validation sheet, indicating that it is legitimate. The e-worksheet was deemed extremely practical based on the findings of the student response questionnaire, with a percentage of 86.44%. The e-worksheet is certified effective in terms of analyzing t test findings with a significance value of 0.00, implying that Ho is rejected and Ha is accepted. The n-gain score for analytical skills was 0.55 on element analysis, 0.59 on relationship analysis, and 0.59 on organizing analysis. Based on these findings, it is possible to infer that the problem-based learning-oriented e-worksheet produced to educate students' analytical abilities on chemical equilibrium content is suitable for usage. ]]>
<![CDATA[Exploration of Student Thinking Systems Through STEM-PjBL Project Based Learning in the Science Field ]]>
<![CDATA[Sukarma, I Ketut]]>;
<![CDATA[Hulyadi, Hulyadi]]>;
<![CDATA[Muhali, Muhali]]>;
<![CDATA[Azmi, Irham]]>
<![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.v12i3.12273
<![CDATA[The complexity of science concepts which are interrelated with each other requires the competence to think systematically. Complex thinking which is the basis for critical, analytical, creative and metacognitive thinking is very important to master in responding to the challenges of the 21st century. The aim of this research is to explore students' thinking systems taught using the STEM-PjBL model. This research is quantitative descriptive research. The variables studied are students' thinking systems based on the ability to determine components that influence each other in the bioethanol synthesis and dehydrator processes. The population in the study was 17 students. Students are distributed in two semesters, namely semesters II and IV. The research uses pre-test and post-test systematic thinking ability tests as data collection techniques and tools. The test consists of 5 essay questions that assess students' systematic thinking competence, and the test used is analyzed for validity, discrimination power, and level of difficulty before use. This test was developed based on indicators of systematic thinking competency. Tests were given to students before and after carrying out project activities for making and dehydrating bioethanol. After carrying out the project, students strengthen their competence through computational simulations related to the project being carried out. The data obtained is then presented in a communicative graph. The research results showed that 35.2% had high system thinking, 29% medium, 35.6% low. These results show that the application of the STEM-PjBL model is able to foster students' systematic thinking competency.]]>
<![CDATA[The Relationship between Drinking Water Consumption, Nutritional Status and Workload with The Incidence of Heat Strain in Tofu-Making Workers in West Kekalik Sub-District ]]>
<![CDATA[Ayu, Baiq Fathin]]>;
<![CDATA[Kardi, Kardi]]>;
<![CDATA[Wanda, Janur]]>
<![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.v12i3.12373
<![CDATA[Various cases of accidents and occupational diseases, as well as other health problems are often caused by unqualified work environment factors, Workers in a hot environment are one of the causes of workers experiencing occupational diseases. Heat strain is an acute or chronic impact caused by exposure to heat stress experienced by a person from physical and mental aspects. The physical impact caused by heat strain ranges from mild complaints such as skin rashes to fainting to life-threatening situations when there is a cessation of sweating and heat stroke. Tofu making is one of the hot working environments. This study uses a quantitative method with a sampling technique using a purposive sampling technique. The sample in this study is 44 tofu makers. The data collection technique uses questionnaires and pulse measurement. Data analysis uses the Spearman Rank test. The results showed that there was a relationship between drinking water consumption and heat strain activity with a value (p = 0.000), there was no relationship between BMI (p = 0.113) and there was a relationship between workload and heat strain incidence (p = 0.000) and heat strain complaints in tofu factory workers. It is expected that workers consume >11 glasses of drinking water and use clothes that can reflect heat such as wearing thin clothes, wearing loose shirts and easily absorbing sweat.]]>
<![CDATA[Development of LKPD based on project-based learning oriented chemo-entrepreneurship on hydrocarbon material for phase F SMA/MA ]]>
<![CDATA[Velly, Aglin]]>;
<![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.v12i3.12442
<![CDATA[This development research was conducted to develop a teaching material in the form of a project-based learning worksheet (LKPD) based on chemo-entrepreneurship-oriented learning on hydrocarbon material for phase F SMA / MA. The validity and level of practicality will be known. The type of research used is educational design research (EDR) with the Plomp development model which has three stages, namely preliminary research (initial investigation), prototyping phase (prototype formation stage), and assessment phase (assessment/testing). However, the assessment phase was not carried out in this study where the research was carried out until the results of the validity and practicality of the LKPD were obtained. The validity test was conducted by 3 chemistry lecturers at FMPA UNP and 2 chemistry teachers at SMAN 3 Padang using a validity questionnaire sheet. Practicality was conducted by 2 chemistry teachers and 9 students of phase F SMAN 3 Padang. The results of the study based on the validity test showed an average Aiken'V 0.87 with a valid category and based on the practicality test showed an average of 90% by students with a very practical category and 94% by teachers with a very practical category. The research results of project-based learning-based LKPD oriented chemo-entrepreneurship on hydrocarbon material for phase F SMA / MA have been valid and practical.]]>
<![CDATA[Development of LKPD Based on Project Based Learning Stoichiometry Material by Utilizing Organic Waste for Phase F SMA/MA ]]>
<![CDATA[Rahmad, Nafisah Yulia]]>;
<![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.v12i3.12443
<![CDATA[The project-based learning model is one of the learning models that supports the application of concepts in everyday life. From the results of the questionnaire given, Project Based Learning-based LKPD is needed and it is very important to compile Project Based Learning-based stoichiometry LKPD in supporting learning in the era of an independent curriculum. The type of research used is development research or Educational Design Research (EDR) with the Plomp development model by Tjeerd Plomp. The research was conducted at SMA Negeri 4 Padang with research subjects namely 3 Chemistry Lecturers FMIPA UNP, 2 SMA Negeri 4 Padang teachers and 9 students of class XI SMA Negeri 4 Padang. The object of research is LKPD based on project-based learning on stoichiometry material by utilizing organic waste for phase F SMA / MA. In terms of research, Plomp as a development study has 3 main stages, namely the initial research stage, the prototype formation stage, and the assessment stage. The results showed that all aspects assessed in each component of the validation of project-based learning-based LKPD on stoichiometry material by utilizing organic waste for phase F SMA / MA obtained an average V value of 0.92 with a valid category. The results are very practical for teachers with an average practicality of 91% and practicality for students is very practical with an average practicality of 89%. Based on the results of the study, it was found that the development of LKPD based on project-based learning on stoichiometric material by utilizing organic waste for phase F SMA / MA was developed valid and practical.]]>
<![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[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.]]>
