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Nurdin Siregar
Jurusan Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Immunology & microbiology Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Other

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Growth Response of Mung Bean Plants Vigna radiata L. and Spinach Amaranthus hybridus L. Under Acidic and Alkaline Conditions Ramadhan, Dwi Sapri; Wardana, Dian; Fahmi, Jaman; Safitri, Wulan Dwi; Lubis, Ghania Dhia Ulhaq; Nainggolan, Lidya Revalina; 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.v8i2.70583

Abstract

This study investigates the growth response of mung bean Vigna radiata L. and spinach Amaranthus hybridus L. under controlled acidic neutral and alkaline environments across a wide pH gradient from pH 3 to pH 14. The work provides a comparative assessment of two species with distinct physiological characteristics to clarify how hydrogen ion concentration shapes vegetative development. The novelty of this study lies in its direct evaluation of extreme pH conditions using a uniform experimental design that allows both species to be examined under identical chemical exposure, enabling a clear contrast of tolerance thresholds. Plant height was recorded daily for 13 days to capture early stage vegetative dynamics. Both species exhibited their highest stability near pH 7 while severe deviations from neutrality reduced growth through nutrient imbalance and physiological stress. Mung bean showed moderate tolerance at pH 9.5 whereas spinach displayed enhanced performance within mild alkalinity. Strong acidity and strong alkalinity produced structural damage in both species. The findings highlight the critical role of soil pH in plant performance and provide foundational insight into species specific tolerance ranges that can support more informed management of crops grown in chemically variable environments.
Temperature Influence on Chemical Reaction Rates and Gas Formation Wardana, Dian; Ramadhan , Dwi Sapri; Fahmi, Jaman; Safitri, Wulan Dwi; Everyanti, Ida Cathy; 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.v8i2.70584

Abstract

Reaction rate is fundamentally defined as the change in the concentration of reactants or products perunit time, and is known to be influenced by several determinants, including surface area, temperature,catalysts, and reactant molarity or concentration. The present study specifically investigates the validityof the widely accepted principle that temperature plays a significant role in modulating reaction rates.Experimental variations were introduced, both in terms of temperature levels and the types of chemicalmixtures employed. The findings confirm that temperature indeed accelerates gas generation across alltested reaction systems. However, in mixtures exhibiting higher viscosity, gas formation proceeds moreslowly due to reduced molecular mobility. Consequently, in the softener–baking soda system, the onsetand progression of gas evolution show noticeable differences compared to less viscous mixtures.
Creative Ice Cream Experiment Using the Freezing Point Depression Principle Safitri, Wulan Dwi; Wardana, Dian; Ramadhan, Dwi Sapri; Fahmi, Jaman; Zubir, Moondra; Siregar, Koriatul Jannah; Purba, Sunita Karin; 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.v8i2.70585

Abstract

This research aims to explore creative approaches in ice cream production by utilizing the effect of freezing point depression. Through these experiments, we employed various additives that influence the physical properties of ice cream, resulting in a final product that is softer, creamier, and able to maintain optimal texture at different temperatures. The experimental method involved varying the types of additives combined with the base ice cream mixture. The measured parameters included freezing point depression, texture, and softness of the produced ice cream. The collected data were analyzed to determine how each additive affected the physicochemical characteristics of the product. The results showed that differences in sugar content among the ingredients significantly influenced the degree of freezing point depression in the ice cream.
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.
Implementation of the Problem Based Learning Model on Critical Thinking and Problem-Solving Skills in Dynamic Electricity Material Intan Kemala Sari NS; Nurdin Siregar; Rita Juliani
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.11725

Abstract

This study aims to analyze the effect of problem based learning model on critical thinking ability and physics problem solving of high school students. This study is a quasi-experimental study with a two-group design with two classes, namely the experimental class and the control class. The population of this study consisted of 2 classes and sampling was carried out by saturated sampling. Class XII MIA 1 as the experimental class and class XII MIA 2 as the control class, each consisting of 30 students. The instrument used in this study was a learning outcome test in the form of an essay test of 10 questions. Data analysis was carried out using the MANOVA test. The results of the study showed that the average pretest and posttest scores in the experimental class were 57.00 and 84.00, respectively, while the average pretest and posttest scores in the control class were 53.00 and 73.50, respectively. Data analysis using the MANOVA test concluded that there was an effect of the problem based learning model on critical thinking ability and problem solving of high school students
Effect of Argument Driven Inquiry (ADI)-STEM Model on Students' Numeracy Literacy and Scientific Argumentation Skills Laia, Syukurman; Siregar, Nurdin; Simanjuntak, Mariati Purnama
Jurnal Penelitian Pendidikan IPA Vol 11 No 8 (2025): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i8.11787

Abstract

This study aims to determine the significant effect of the argument driven inquiry (ADI)-STEM learning model on numeracy literacy and scientific argumentation skills of students on the subject matter of dynamic fluid class XI semester II at SMAN 10 Medan T.P 2024/2025. This type of research is a quasi experiment and the research design is a two-group pretest-posttest. The population in this research is the entire class XI of SMAN 10 Medan T.P 2024/2025. The sample in this study consisted of two classes selected randomly with simple random sampling technique, class XI IPA-1 as an experimental class using argument driven inqiry (ADI)-STEM learning model with a total of 36 students and class XI IPA-2 as a control class with conventional learning model with a total of 31 students. The instrument in this study was a test in the form of a 10 question essay. Data analysis was used with manova test. The results of the study were obtained with the average value of the numeracy literacy pretest of the experimental class and control class 53.89 and 54.19 respectively while the scientific argumentation of the experimental class and control class 52.22 and 51.68 respectively. The average post-test scores of numeracy literacy of experimental and control classes were 83.22 and 71.48 respectively while scientific argumentation of experimental and control classes were 86.78 and 70.90 respectively. Data analysis using manova test concluded that there is a significant effect of argument driven inquiry learning model on numeracy literacy and scientific argumentation
Co-Authors Agustina Butar-butar Alfandi Gulo Anna Aria Ningsih Harahap Ayu Andini Br Napitupuli, Monika Shinta Kasih Br Sebanyang, Resi Mai Linda Etaminta Br Sipahutar, Desy Meriani Dede Aria Ningsih Harahap Dewi Feronika Manullang Dewita AR Diego Ferdinand Disna Margaretha Erniria Erniria Eva Marlina Ginting Everyanti, Ida Cathy Evy Maria Br Meliala Fahmi, Jam'an Fahmi, Jaman Fauzi Girsang Fernando Lumban Batu Gulo, Puji Kasih Laurensia Gusrianta Gusrianta Harahap, Anna Aria Ningsih Harahap, Dede Aria Ningsih Herda A. Nainggolan Husna, Wiki Nadia Hutajulu, Romantina Intan Kemala Sari NS Iramaya Fridayanti Sinaga Jubaidah, Jubaidah Laia, Syukurman Limbong, Julian Lubis, Ghania Dhia Ulhaq Lumbantoruan, Sifra H.R Manullang, Dewi Feronika Manullang, Riska Greselia Marbun, Elazabeth Motlan . Motlan Motlan Nadhilla, Annisa Nainggolan, Lidya Revalina Novita Pakpahan Nurhabibah Purba Nurliana Marpaung Pangihutan Gultom Peranginangin, Gunawan Pinem, Sri Karina Puandra, Esti Miska Purba, Nurhabibah Purba, Sunita Karin Radisman Saragih Rahmatsyah Ramadhan , Dwi Sapri Ramadhan, Dwi Sapri Rita Juliani Rotua Fetricia Silitonga Saanatun . Sabarina Sabarina Safitri, Wulan Dwi Sagala, Novitri Yolanda Salomo Leonardus Simanjuntak Santro Nomember Manalu Siagian, Maria Agnes Sihotang, Pelita Silalahi, Sarina Septiani Simamora, Elisabeth Simanjutak, Mariati Purnama Siregar, Ida Cathy Everyanti Siregar, Koriatul Jannah Sri Karina Pinem Teti Dian Sari Thesa Irene Sari S Tjiufen Viin M Manurung . Wahyudi, Arya Wardana, Dian Yohana Chintya Siregar Yuni Evany Sinaga Zubir, Moondra