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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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Reducing Coffee Acidity and Caffeine through the Roasting Method using Azadirachtaindica Firewood Putera, Dwi; Yamin, Yamin; Firdaus, Thoriqi
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i3.12140

Abstract

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.
The Modification of Eco-Enzyme Liquid and The Effect on Tomato Preservation with Soaking Then Rinsing in Water Method Yuliana, Meta
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 1 (2024): February 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i1.10593

Abstract

Tomatoes are the popular fruit but having short shelf life. This fruit require some treatment to maintain it’s quality during post-harvesting. Eco-enzyme is a fermented liquid, it’s made by fermentation process of fresh waste vegetables or fruits. Previous study showed that spraying tomatoes with Eco-enzyme can maintain the shelf life of tomatoes. This study aim to observe the effect of various liquid in Eco-enzyme fermentation and it’s effect to tomatoes preservation by soaking method. The research was experiment research using quality scale of tomatoes. The Eco-enzyme was fermented using different liquid such as water, coconut water and rice rinsed water. Tomatoes were soaked with each Eco-enzyme treatment with 50% and 100% concentration of each liquid for 5 minutes then rinsed them and observed their quality for 8 days during storage process. The control treatments are non-soaked and non-rinsed tomatoes. The observation include the quality of tomatoes and the quality of Eco-enzyme. The result of this study found that modification of liquid in Eco-enzyme fermentation have different effect for tomatoes preservation. Soaking and rinsing method also have different effect for tomatoes. The best treatment for EE1 is EE1-rinse-concentration 50%, EE2 is EE2-rinse-concentration 100%, and EE3 is EE3-rinse-concentration 50%. The soaking followed rinsing was the best method for tomatoes preservation treatment using Eco-enzyme.
The Effect of Problem-Based Learning Model on Students’ Learning Outcomes Viewed from Learning Styles Arni, Kurnia Julianti; Kosim, Kosim; Verawati, Ni Nyoman Sri Putu
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 2 (2024): April-May 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i2.11788

Abstract

This study explores the effectiveness of the Problem-Based Learning (PBL) model on students' learning outcomes, focusing on how different learning styles—visual, auditory, and kinesthetic—affect its efficacy. Conducted at SMA Negeri 1 Narmada, the research employed a quasi-experimental design with a pretest-posttest nonequivalent control group setup to measure the impacts of PBL versus traditional teaching methods. Findings from the study revealed significant improvements in the physics learning outcomes for the experimental group, which engaged with the PBL model, compared to the control group that used conventional direct instruction methods. Statistical analysis using a two-way ANOVA showed a significant enhancement in learning outcomes associated with the PBL model (p = 0.030), but no significant interaction between learning styles and the learning model was found, indicating that the PBL model benefits all learning styles equally without preference. These results suggest that while PBL universally improves learning outcomes, individual learning styles do not significantly alter its effectiveness. The study highlights the potential of PBL to not only increase academic performance in physics but also to foster a more engaging and participatory learning environment. It underscores the importance of adopting educational models that accommodate diverse learning preferences and provide dynamic, student-centered learning experiences. This research contributes to the understanding of instructional effectiveness and supports the broader implementation of PBL in physics education to cater to varied educational needs and learning styles.
Development of Domia Card (Domino Chemistry) as Evaluation Media of Mol Concept Anastasius Khristozolla Phikly; Andi Ifriany Harun; HUsna Amalya Melati
Hydrogen: Jurnal Kependidikan Kimia Vol 11, No 6 (2023): December 2023
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v11i6.9188

Abstract

The level of achievement of students at State Senior High School (SMAN) 1 Putussibau in the material of the mole concept only reached 20%, and this figure cannot even depict the true potential of students in understanding the mole concept due to indications of cheating in every monotonous evaluation. DOMIA (Chemical Domino) was developed to address the problem of a lack of variation in evaluations while also reducing the incidence of student cheating in the evaluation process. DOMIA was developed with the R&D principle using the ADDIE model, and each process will be revised according to needs and field findings. The development of DOMIA took place after the needs analysis process through direct interviews with subject teachers and several randomly selected students. The developed DOMIA was then validated to test the level of feasibility and reliability based on Guilford indicators as a reference in assessment. DOMIA has Kr = 0.97 and Ks = 0.947, indicating that DOMIA is highly valid and very reliable, making it ready for implementation and serving as a new evaluation tool that has not existed in the chemistry subject before.
Development of Guided Inquiry Oriented with Chemical Representations e-Worksheets to Train Science Process Skills on Chemical Equilibrium Putri, Robertha Febriana; Novita, Dian
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 2 (2024): April-May 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i2.11146

Abstract

Chemistry learning, namely chemical equilibrium material, is considered less easy to understand for students because they are less able to represent mutiples of chemical representations, and science process skills are low. This problem was found referring to the results of a pre-research questionnaire of students and interviews with high school teachers in Surabaya. Overcoming this, learning media that helps students understand the material according to the characteristics of students is needed. The purpose of this research is to produce a product in the form of Student worksheet electronic that is feasible to develop on chemical equilibrium material. The method used is research and development with the 4D model which consists of defining, designing, developing, and disseminating stages. This research was only conducted up to the development stage. Student worksheet electronic on chemical equilibrium material was tested on students of class XI-5 SMA Negeri 3 Surabaya who had studied chemical equilibrium material was the subject of this study. This research instrument is in the form of a review sheet, validation sheet, student response questionnaire sheet, observation sheet, test sheet. This research produces guided inquiry Student worksheet electronic media oriented to multiple chemical representations on chemical equilibrium material. The results of Student worksheet electronic validation from the aspects of content validity and construct validity, each obtained a mode of 4 so that it is very valid to use. The results of the student response questionnaire reached an average of 88.3% positive response with a very practical category. The results of pretest and posttest data analysis obtained an increase in science process skills as much as 80% of students get a high criteria n-gain score. It is concluded that the guided inquiry Student worksheet electronic oriented to multiple chemical representations on chemical equilibrium material is feasible to use to train students' science process skills.
Penerapan Green Chemistry Nomor 7 untuk Penurunan Kesadahan Air Muhammad Bakhru Thohir
Hydrogen: Jurnal Kependidikan Kimia Vol 11, No 6 (2023): December 2023
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v11i6.9871

Abstract

Bojonegoro memiliki bentangan pegunungan kapur, sehingga banyak sumber air di sekitar gunung kapur yang memiliki kualitas buruk. Solusi untuk masalah kesadahan air adalah dengan menggunakan pemanasan, namun teknik ini gagal untuk senyawa refraktori. Selain dipanaskan, solusi lain adalah disaring dan ditambah arang aktif, namun masalahnya adalah banyak arang aktif yang produksinya masih menggunakan asam sintetik dan hal ini bertentangan dengan 12 prinsip green chemistry. Tujuan dari riset ini adalah mensubtitusi asam sintetik dengan asam bahan alam dan juga mengetahui signifikansi kerja dari asam bahan alam dalam aktivasi arang aktif. Subtitusi asam sintetik dengan asam bahan alam sebagai aktivator arang adalah keterbaruan dari riset ini, karena selama ini penelitian masih berfokus pada modifikasi asam, belum mempertimbangkan pentingnya penerapan 12 prinsip green chemistry.Penelitian ini diawali dengan produksi arang, lalu aktivasi dengan beragam asam, dan terakhir pengujian performa. Asam bahan alam didapat dari pasar pasar tradisional di Bojonegoro, sementara untuk sampel air sadar adalah sampel simulasi. Hasil dari riset adalah asam bahan alam dapat digunakan sebagai aktivator untuk mengaktivasi arang, hal ini terlihat dari hasil presentase kemampuan adsorbsi, didapatkan bahwa arang aktif yang diproduksi dengan Citrus aurantifolia S. dapat menurunkan sebanyak 29,05%; arang aktif dengan Averrhoa bilimbi L. sebesar 37,50%; dan dengan aktivator HCl sebesar 19,89%. Hasil yang didapat mengindikasikan bawah riset ini memenuhi prinsip nomor 7 dari 12 prinsip green chemistry pada bidang produksi arang aktif.
Development of Acid-Base Titration Practicum Guide Using Natural Indicators of Butterfly Pea Flowers Hanifa, Suci Rahma; Ardiansyah, Ardiansyah; Afrianis, Neti; Okmarisa, Heppy
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 1 (2024): February 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i1.10813

Abstract

Sustainable Development Goals (SDGs) need to be implemented to create environmentally friendly chemistry learning. This can be done in an acid-base titration experiment using natural indicators of butterfly pea flowers. This research aims to produce a practicum guide for acid-base titrations using natural indicators of butterfly pea flowers that are valid and practicum. The research design uses the ADDIE research design, namely Analysis, Design, Development, Implementation, and Evaluation. The research results showed that butterfly pea flowers can be used as a natural indicator for acid-base titrations with color changes from pink (acidic condition) to blue (basic condition). The resulting learning media is a practicum guide which has a validity of 92% (very valid) and a practicality level of 88.75% (very practical). This data was analyzed using qualitative and quantitative analysis. The practicum guide developed is valid and practical to use as a practicum learning media in schools.
Transforming Chemistry Learning through the Development of Higher Order Thinking Based on Revised Bloom's Taxonomy: A Systematic Review Putri, Annisa Khairani; Fahrunisa, Allika Haya; Evriliani, Agnes Suci; Volosa, Erin; Nahadi, Nahadi
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i3.12452

Abstract

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. 
Development of Chemistry Learning Media based on Joyful Learning with Snakes and Ladders Game on Stoichiometry material to Improve Student Learning Outcomes Janah, Miftakhul; Mitarlis, Mitarlis
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 1 (2024): February 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i1.10192

Abstract

This research aims to obtain chemistry learning media based on joyful learning with the snakes and ladders game on stoichiometric material that is suitable for use to improve student learning outcomes based on the validity, practicality and effectiveness of the game. The research method used is the research development (R&D) method with the 4D model by Tigharajan which consists of 4 main stages, define, design, develop and disseminate. However, the development of Joyful Learing-based Chemistry Learning Media with the Snakes and Ladders game has only reached the development stage. The research was carried out at Surabaya State University and SMA Negeri 1 Menganti Gresik. Test the game media using the One Group Pretest-Posttest Design system. Validity is obtained from the assessment of the stoichiometric snake and ladder game media by the validator. Practicality is obtained from the results of observing student activities, observing the implementation of learning activities, and student response questionnaires. Effectiveness is obtained from student learning outcomes. The results of the research show that chemistry learning media based on joyful learning with the snakes and ladders game on stoichiometric material is suitable for improving student learning outcomes with a feasibility score of ≥ 4 in the feasible to very feasible category. The practicality of chemistry learning media based on joyful learning with the snakes and ladders game on stoichiometric material to improve student learning outcomes is said to be suitable for use in terms of the results of observations of student activities which obtained a percentage of 96.81%, the results of observations of learning implementation obtained a percentage of 93.98%, and Student responses obtained a percentage of 91.52%. Then, the effectiveness of chemistry learning media based on joyful learning with the snakes and ladders game on stoichiometry material to improve student learning outcomes which was developed in terms of pretest and posttest scores was declared effective. This is shown by the N-gain score of all students being in the medium to high category and meeting the KKM value, with an average N-gain value of 0.79 with high criteria. This shows that the stoichiometric snakes and ladders game is declared suitable for use as a chemistry learning medium based on joyful learning on stoichiometric material to improve student learning outcomes.
The Effect of Virtual Laboratory on Students' Computational Thinking on Half-Life Concepts Mashami, Ratna Azizah; Ahmadi, Ahmadi; Hatimah, Husnul
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i3.12107

Abstract

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.

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