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All Journal Orbital: Jurnal Pendidikan Kimia Indonesian Journal of Chemical Science and Technology CHEDS: Journal of Chemistry, Education, and Science
Fahmi, Jam'an
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Materials Science & Nanotechnology

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Pengembangan Asesmen Formatif Berbasis Problem Based Learning untuk Meningkatkan Keterampilan Berpikir Kritis: Need Assessment Study Fahmi, Jam'an; Nahadi, Nahadi; Hernani, Hernani
Orbital: Jurnal Pendidikan Kimia Vol. 7 No. 2 (2023): Orbital: Jurnal Pendidikan Kimia
Publisher : Chemistry Education Department of Education and Teaching Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/ojpk.v7i2.19922

Abstract

Curriculum, learning, and assessment are the main keys to educational success. Formative assessment is an interactive strategy to identify what must be learned and how teaching is formulated according to educational needs. The questionnaire results show that chemistry teachers in schools still do not utilize formative assessments to measure the progress of the educational process. This research aims to collect information regarding the need for developing formative assessments for problem-based learning to improve students' critical thinking skills in the sub-material of vapor pressure reduction. A qualitative method was used in this research, involving 40 chemistry teacher participants in the province of North Sumatra, Indonesia. Participants were asked questions regarding their views on the need for assessment development through a questionnaire. Several of them were interviewed semi-structured to gain more in-depth information from the questionnaire answers. Data were analyzed using the Miles and Huberman model which consists of the steps: collection, reduction, display, and conclusion. The research results show that teachers agree that PBL-based formative assessments are needed to measure students' critical thinking skills. They suggest researchers choose Ennis's version of critical thinking indicators because they have good detail and warn researchers to practice Problem-Based Learning syntax correctly. Apart from that, it is hoped that successful learning in the classroom can be achieved through the use of products from the development of this formative assessment, namely test instruments and observation sheets.
Effect of Electrode Type and Current Strength on the Mass of Substance Reduced at the Cathode in the Electrolysis Process Fahmi, Jam'an; Ramadhan, Dwi Sapri; Wardana, Dian; Safitri, Wulan Dwi; Zubir, Moondra; Siregar, Nurdin; Manullang, Riska Greselia; Sagala, Novitri Yolanda; Br Sipahutar, Desy Meriani
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70607

Abstract

This study investigates the effect of electrode type and current strength on the mass of hydrogen gas produced at the cathode during the electrolysis of sodium chloride solution. A simulation based on Faraday’s law was conducted using three electrode materials—carbon, copper, and zinc—under controlled current settings of 0.10 A, 0.20 A, and 0.30 A for a fixed electrolysis duration of 30 minutes. Current efficiency values were assigned to each electrode to model realistic performance differences, with copper exhibiting the highest efficiency, followed by zinc and carbon. The results show that increasing the current leads to a linear rise in the mass of hydrogen produced for all electrode types, confirming the proportional relationship between electric charge and cathodic reduction predicted by Faraday’s law. Additionally, copper electrodes produced the highest hydrogen yield at all current levels, while carbon generated the lowest, indicating that electrode characteristics influence electrochemical efficiency. Overall, the findings demonstrate that current strength is the dominant factor determining the mass of reduced species at the cathode, whereas electrode material provides a secondary yet significant contribution to electrolysis effectiveness.
Effect of Sugar Addition on the Electric Current Strength of Mixtures with Vinegar, Lime Extract, Coffee, Salt Solution, and 70% Alcohol Wardana, Dian; Ramadhan, Dwi Sapri; Fahmi, Jam'an; Safitri, Wulan Dwi; Siregar, Ida Cathy Everyanti; Silalahi, Sarina Septiani; Zubir, Moondra; Siregar, Nurdin
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70611

Abstract

This study aims to examine the electric current strength of sugar mixed with various electrolyte and non-electrolyte solutions. The research employed an experimental approach using vinegar, lime extract, coffee solution, salt solution, and 70% alcohol combined with sugar solutions. A battery system and a digital multimeter were utilized to measure the resulting current in each mixture. The findings indicate that increasing the amount of sugar leads to a reduction in current strength, whereas decreasing the sugar content results in a higher current output.
Influence of EM4 Inoculum on Biogas Yield and pH Dynamics in Lettuce and Cabbage Waste Fermentation Ramadhan, Dwi Sapri; Safitri, Wulan Dwi; Wardana, Dian; Fahmi, Jam'an; Zubir, Moondra; Andini, Ayu; Simamora, Elisabeth; Limbong, Julian; Sihotang, Pelita; Husna, Wiki Nadia; Siregar, Nurdin
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70612

Abstract

Biogas production from vegetable waste offers a practical pathway for reducing organic residues and supporting small-scale renewable energy systems. This study investigates the influence of EM4 inoculum on gas accumulation and pH dynamics during an 8-day batch fermentation of lettuce and cabbage waste. Four reactors were prepared containing 200 g vegetable waste and 200 mL water with or without 30 g EM4. Gas accumulation was quantified by balloon circumference at day 2, day 4, day 6 and day 8 and converted to volume using geometric calculations. Lettuce generated the highest peak volumes with maximum values exceeding 330 cm³ while cabbage produced less than 60 cm³ under comparable conditions. pH trajectories showed that cabbage plus water decreased from pH 7 to pH 6 whereas lettuce plus water increased from pH 7 to pH 8. Reactors containing EM4 stabilised at pH 6 throughout the fermentation indicating inoculum-supported buffering. These results demonstrate that substrate characteristics strongly influence early-stage gas formation and that EM4 moderates pH fluctuations even under uncontrolled ambient conditions. The findings provide initial evidence that lettuce is a more degradable feedstock than cabbage and emphasise pH regulation as a key requirement for improving methane-oriented biogas performance in simple batch systems.
Effect of Organic and Inorganic Compounds on the Conductivity of Salt Solutions Safitri, Wulan Dwi; Wardana, Dian; Ramadhan, Dwi Sapri; Fahmi, Jam'an; Zubir, Moondra; Purba, Sunita Karin; Puandra, Esti Miska; Siregar, Nurdin
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70635

Abstract

This study examines the effects of selected organic and inorganic compounds on the electrical conductivity of salt solutions. Organic substances (sugar, coffee, tea, and a surfactant-based cleaner) and inorganic additives (ammonium chloride in cough medicine, povidone–iodine, and carbonated beverage) were mixed with salt solutions at varying concentrations to evaluate their influence on ion availability and mobility. The results show that conductivity increases proportionally with salt concentration, confirming that ion content is the primary factor governing charge transport. Inorganic ionic additives significantly enhanced conductivity by releasing additional ions into the solution, whereas non-ionic organic compounds consistently reduced conductivity at low salt levels by diluting ionic species and hindering ion mobility. Conductivity in organic mixtures increased only when salt concentration became dominant. These findings highlight the contrasting mechanisms of organic and inorganic additives in modifying electrolyte behavior and provide useful insight for chemistry education and simple electrochemical analysis.
Analysis of the Effect of Varying Concentrations of Strong Acids (HCl) and Weak Acids (CH3COOH) with Mixing of Bases (Detergent) on the Temperature Increase of the Reaction Results Fahmi, Jam'an; Ramadhan, Dwi Sapri; Wardana, Dian; Safitri, Wulan Dwi; Zubir, Moondra; Siregar, Nurdin; Br Sebanyang, Resi Mai Linda Etaminta; Br Napitupuli, Monika Shinta Kasih; Lumbantoruan, Sifra H.R
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70670

Abstract

Neutralization reactions between acids and bases are generally exothermic processes that release heat because of water formation from H⁺ and OH⁻ ions. This study aims to investigate the effect of varying concentrations of a strong acid (HCl) and a weak acid (CH₃COOH) on the temperature increase produced when these acids are reacted with a detergent-based alkaline material. Experiments were conducted using three acid concentrations—0.1 M, 0.3 M, and 0.5 M—each mixed with 3 g, 5 g, and 7 g of detergent in a reaction volume of 25 mL. The results indicate that increasing acid concentration correlates positively with greater temperature elevation. The largest temperature increase, 5.7°C, was observed in the reaction between 0.5 M HCl and 7 g of detergent, whereas the lowest increase, 0.5°C, occurred in the reaction between 0.1 M CH₃COOH and 3 g of detergent. Differences in ionization strength between strong and weak acids significantly influence the amount of heat released during neutralization. These findings demonstrate that both acid strength and base mass play important roles in determining the exothermic energy output of acid–base reactions.
PENERAPAN MEDIA PEMBELAJARAN BERBASIS WEBSITE MENGGUNAKAN MODEL KOOPERATIF TIPE SCRAMBLE PADA MATERI HIDROLISIS GARAM Safitri, Wulan Dwi; Eddiyanto, Eddiyanto; Wardana, Dian; Ramadhan, Dwi Sapri; Fahmi, Jam'an
CHEDS: Journal of Chemistry, Education, and Science Vol 9, No 2 (2025)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v9i2.11838

Abstract

Fokus penelitian ini adalah untuk menentukan peningkatan hasil belajar siswa di kelas eksperimen setelah diajar menggunakan media pembelajaran berbasis web dengan model kooperatif tipe scramble pada materi hidrolisis garam. Instrumen yang digunakan adalah 20 pertanyaan objektif. Dari hasil analisis, rata-rata peningkatan siswa kelas eksperimen adalah 0,7414 (kategori tinggi) dan di kelas kontrol adalah 0,5881 (kategori sedang). Berdasarkan hasil uji hipotesis dengan uji t sisi kanan, ditemukan bahwa t hitung lebih besar dari t tabel atau 8,064 2,0021 dengan tingkat signifikansi α = 0,05, sehingga Ha diterima, sehingga peningkatan hasil belajar di kelas yang diajar menggunakan media pembelajaran berbasis web lebih tinggi daripada peningkatan hasil belajar di kelas yang diajar tanpa menggunakan media pembelajaran berbasis web (konvensional).
Co-Authors Ayu Andini Br Napitupuli, Monika Shinta Kasih Br Sebanyang, Resi Mai Linda Etaminta Br Sipahutar, Desy Meriani Eddiyanto Eddiyanto HERNANI - Husna, Wiki Nadia Limbong, Julian Lumbantoruan, Sifra H.R Manullang, Riska Greselia Nahadi Nurdin Siregar Puandra, Esti Miska Purba, Sunita Karin Ramadhan, Dwi Sapri Safitri, Wulan Dwi Sagala, Novitri Yolanda Sihotang, Pelita Silalahi, Sarina Septiani Simamora, Elisabeth Siregar, Ida Cathy Everyanti Wardana, Dian Zubir, Moondra