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All Journal Jurnal Matematika & Sains Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) Journal of Mathematical and Fundamental Sciences Jurnal Pendidikan Kimia Universitas Riau Jurnal Tadris Kimiya Jurnal Pendidikan Kimia (JPKim) JOURNAL OF SCIENCE AND SOCIAL RESEARCH Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Indonesian Journal of Chemical Science and Technology Hydrogen: Jurnal Kependidikan Kimia Jurnal Teknologi Pendidikan : Jurnal Penelitian dan Pengembangan Pembelajaran SCIENCE : Jurnal Inovasi Pendidikan Matematika dan IPA Ensiklopedia: Jurnal Pendidikan dan Inovasi Pembelajaran Saburai Educenter: Jurnal Ilmiah Pendidikan Jurnal Sains dan Teknologi Makara Journal of Science Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam (JURRIMIPA) Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Jurnal Sains dan Ilmu Terapan EDUCENTER JURNAL PENDIDIKAN Journal of Humanities Education Management Accounting and Transportation Indonesian Journal of Jamu
Iis Siti Jahro
Universitas Negeri Medan
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Veterinary Other

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Effectiveness of sulfuric acid and hydrochloric acid catalysts in the esterification of frankincense cinnamic acid with ethanol and methanol Sitorus, Marham; Suyanti, Retno Dwi; Jahro, Iis Siti; Siahaan, Suria Bersinar; Saragih, Innovayani; Sitorus, Francisca T. A
Jurnal Pendidikan Kimia Vol. 16 No. 1 (2024): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i1.53231

Abstract

This research aims to compare the effectiveness of sulfuric acid and hydrochloric acid catalysts in the esterification of frankincense cinnamic acid (STYRAX paraleoncomud PERK). Esterification of sulfuric acid catalyst is carried out with ethanol and for hydrochloric acid catalyst with methanol. Esterification was carried out by refluxing a mixture of 1:20 cinnamic acid - ethanol and methanol, with 3 mL of each catalyst at a temperature of 60oC for one hour. The results were rinsed with 3 x 50 mL distilled water and dried with anhydrous sodium sulfate. The results were filtered and verified for functional groups using FTIR and composition analysis using GC “ MS. The results of FTIR interpretation show a decrease in absorption intensity (-OH) at 3500 cm-1 as a functional group that reacts compared to the ester results as an indication of the ongoing esterification reaction. The resulting ethyl cinnamate has a high conversion of 84.42%. Methyl cinnamate also has a distinctive ester aroma but is clearer and based on GC-MS, the content of methyl cinnamate is relatively low, namely 34.40%, the remaining cinnamic acid is 37.28%, and various side products of 28.32%. Thus, the catalyst that provides better conversion is sulfuric acid, but it requires further purification by examining the appropriate absorbent and bleaching agent. The brown color of the ester product catalyzed by sulfuric acid is thought to occur due to the oxidation of the cinnamic acid double bond by the catalyst.
Differences in Learning Outcomes and Science Process Skills of Students Learned with the Model Project Based Learning and Discovery Learning on Acid-Base Material Sembiring, Niki Arih Ersada Br; Jahro, Iis Siti
Jurnal Teknologi Pendidikan : Jurnal Penelitian dan Pengembangan Pembelajaran Vol. 9 No. 2 (2024): April
Publisher : UNDIKMA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/jtp.v9i2.11245

Abstract

The purpose of this study is to determine the differences in learning outcomes and science process skills of students learned with Project Based Learning and Discovery Learning models on acid-base material, as well as the correlation between students' science process skills and student learning outcomes. This research is a quantitative research. The samples in this study were taken by random sampling of 2 classes, namely XI MIPA 1 as experimental class I and XI MIPA 3 as experimental class II, where each class was taken by 29 students based on the similarity of pretest results. The instruments used are test instruments in the form of multiple-choice questions and essays and non-test instruments in the form of observation sheets. Hypothesis testing was carried out using the SPSS Statistic version 24 for Windows computer program using the Independent Sample T-Test and Bivariate Pearson Correlation. For hypothesis I obtained the value of sig. (2-tailed) 0.008   (0.05) so that Ha is accepted, which means that there are differences in student learning outcomes learned with Project Based Learning and Discovery Learning models on acid-base material. For hypothesis II obtained sig value. (2-tailed) 0.010   (0.05) so that Ha is accepted, which means that there are differences in students' science process skills learned with the Project Based Learning and Discovery Learning models on acid-base material. For hypotheses III and IV obtained sig values. (2-tailed) of 0.002 and 0.001  (0.05) so that Ha is accepted, which means that there is a correlation between students' science process skills and student learning outcomes learned with Project Based Learning and Discovery Learning models on acid-base material.
The development of interactive multimedia based lectora inspire on chemical bonding material for grade X senior high school Sary, Putri Yustika; Iis Siti Jahro
Educenter : Jurnal Ilmiah Pendidikan Vol. 1 No. 9 (2022): Educenter : Jurnal Ilmiah Pendidikan
Publisher : ARKA INSTITUTE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55904/educenter.v1i9.109

Abstract

This research aims to determine to develop interactive multimedia based on the Lectora Inspire on chemical bonding for grade X Senior High School an, knowing the feasibility of developing interactive multimedia based on the Lectora Inspire on chemical bonding materials in accordance with the BSNP form assessment criteria. The type of research is (R&D) by implementing 4-D development model by Thiagarajan. The stages are define, design, develop, and disseminate. The results of media validation of the 3 validators showed that the product was included in the "Very Feasible" category because the average percentage of validation results from 3 validators was above 90%, namely 95.33%; 91.7% and 100%. The results of material validation of the 3 validators showed that the material was included in the "Very Feasible" category because the average percentage of validation results from 3 validators was above 95%, namely 97%; 97% and 95.7%. From the result, it can be conclude that the Interactive Multimedia Based Lectora Inspire on Chemical Bonding Material for Grade X Senior High School is appropriate to implement for teaching and learning process.
The development of interactive multimedia based lectora inspire on chemical bonding material for grade X senior high school Sary, Putri Yustika; Iis Siti Jahro
Educenter : Jurnal Ilmiah Pendidikan Vol. 1 No. 9 (2022): Educenter : Jurnal Ilmiah Pendidikan
Publisher : ARKA INSTITUTE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55904/educenter.v1i9.109

Abstract

This research aims to determine to develop interactive multimedia based on the Lectora Inspire on chemical bonding for grade X Senior High School an, knowing the feasibility of developing interactive multimedia based on the Lectora Inspire on chemical bonding materials in accordance with the BSNP form assessment criteria. The type of research is (R&D) by implementing 4-D development model by Thiagarajan. The stages are define, design, develop, and disseminate. The results of media validation of the 3 validators showed that the product was included in the "Very Feasible" category because the average percentage of validation results from 3 validators was above 90%, namely 95.33%; 91.7% and 100%. The results of material validation of the 3 validators showed that the material was included in the "Very Feasible" category because the average percentage of validation results from 3 validators was above 95%, namely 97%; 97% and 95.7%. From the result, it can be conclude that the Interactive Multimedia Based Lectora Inspire on Chemical Bonding Material for Grade X Senior High School is appropriate to implement for teaching and learning process.
ANALISIS KANDUNGAN ELEKTOLIT DAN NON ELEKTROLIT PADA TANAMAN OBAT KELUARGA (TOGA) Jahro, Iis Siti; Simanullang, Selafionita; Hutagalung, Tien Parsaulian; Simanjuntak, Putrina; Sati, Naffa; Pratama, Muhammad Rizky; Daeli, Dinastini
SCIENCE : Jurnal Inovasi Pendidikan Matematika dan IPA Vol. 5 No. 1 (2025)
Publisher : Pusat Pengembangan Pendidikan dan Penelitian Indonesia (P4I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51878/science.v5i1.4524

Abstract

The objectives of this study include to determine the content of electrolytes and non-electrolytes and determine the current strength in the solution of family medicinal plants. Electrolyte solutions have important benefits in human daily life, especially in foods consumed by humans that contain electrolytes and non-electrolytes. Electrolyte solutions are needed by the body so that organs can function such as the brain, nerves and muscles. The benefits of electrolytes are that they help maintain water balance and cell turgor pressure which is important for cell growth, electrolytes such as potassium, sodium, and calcium play a role in the transformation of nutrients and enzymes in plants. The benefits of non-electrolytes in plants as energy metabolism such as sugars and amino acids that play a role in the storage and use of energy, affecting the internal pH of cells and the environment. The tools used in this experiment include: multimeter, multitester prop cable, 1 9V battery, 1 small 2.5V lamp, 11 plastic cups, iron, chopper, cable, light fittings, scissors / cutter, tablespoon, sieve, grater, cardboard. Materials used are water, avocado fruit, pineapple fruit, banana fruit, lemongrass, turmeric, lemon fruit, pandan leaves, betel leaves, ginger, tomatoes, lime, and tissue. ABSTRAKTujuan penelitian ini antara lain untuk mengetahui kandungan elektrolit dan non-elektrolit serta mengetahui kuat arus pada larutan tanaman obat keluarga. Larutan elektrolit memiliki manfaat penting dalam kehidupan sehari-hari manusia terutama pada makanan yang dikonsumsi manusia yang mengadung elektrolit dan non elektrolit. Larutan elektolit dibutuhkan tubuh agar organ tubuh bisa berfungsi seperti otak, saraf dan otot. Adapun manfaat elektrolit yaitu membantu dalam menjaga keseimbangan air dan tekanan turgor sel yang penting untuk pertumbuhan sel, elektrolit seperti kalium, natrium,dan kalsium berperan dalam tranformasi nutrisi dan enzim dalam tanaman. Manfaat non- elektrolit pada tanaman sebagai metabolisme energi seperti gula dan amino yang berperan dalam penyimpanan dan penggunaan energi, mempengaruhi pH internal sel dan lingkungan. Alat yang digunakan dalam percobaan ini antara lain: multimeter,kabel prop multitester, 1 baterai 9V, 1 buah lampu kecil 2,5V, 11 buah cup plastik, besi, chopper, kabel, fitting lampu, gunting/cutter, sendok makan, saringan, parutan, kardus. Bahan yang digunakan air, buah alpukat, buah nenas, buah pisang, sereh, kunyit, buah lemon, daun pandan, daun sirih, jahe, tomat, jeruk nipis, dan tissue.
ANALISIS KOMPREHENSIF SENYAWA KOVALEN POLAR DAN NONPOLAR PADA TANAMAN OBAT KELUARGA: IDENTIFIKASI DAN POTENSI PENGGUNAANNYA Sihombing, Cindy Monalisa; Jahro, Iis Siti; Gurning, Mita Agresia; Aulianti, Dita; Situmorang, Elsa Hasri Novensa; Simaremare, Happy G. Maritoma; Syafitri, Amelia
SCIENCE : Jurnal Inovasi Pendidikan Matematika dan IPA Vol. 5 No. 1 (2025)
Publisher : Pusat Pengembangan Pendidikan dan Penelitian Indonesia (P4I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51878/science.v5i1.4525

Abstract

This article presents an in-depth analysis of the polarity properties of polar and nonpolar covalent compounds found in various family medicinal plants, and explores their potential applications in health and the food industry. Covalent compounds, which are formed through the shared use of electron pairs between atoms, play an important role in determining the chemical and physical properties of a substance. This study used solubility and filter paper testing methods to identify the polarity of compounds in plant samples such as orange, lemon, tomato, spinach, and chili, which were found to be polar, and cinnamon, ginger, turmeric, galangal, and kencur, which showed nonpolar properties. These results suggest that polar compounds have the potential to be applied in products that require interaction with water, such as herbal drinks, while nonpolar compounds are more suitable for use in oil-based formulations, such as ointments or essential oils. A deeper understanding of the polarity characteristics of these compounds not only broadens scientific insights into medicinal plants, but also opens up opportunities for the development of innovative products in the pharmaceutical and food fields ABSTRAKArtikel ini menyajikan analisis mendalam terhadap sifat polaritas senyawa kovalen polar dan nonpolar yang terdapat pada berbagai jenis tanaman obat keluarga, serta mengeksplorasi potensi aplikasinya dalam bidang kesehatan dan industri pangan. Senyawa kovalen, yang terbentuk melalui penggunaan bersama pasangan elektron antar atom, memainkan peran penting dalam menentukan sifat kimia dan fisika suatu zat. Penelitian ini menggunakan metode uji kelarutan dan pengujian kertas saring untuk mengidentifikasi polaritas senyawa pada sampel tanaman seperti jeruk, lemon, tomat, bayam, dan cabai yang ditemukan bersifat polar, serta kayu manis, jahe, kunyit, lengkuas, dan kencur yang menunjukkan sifat nonpolar. Hasil penelitian ini menunjukkan bahwa senyawa polar memiliki potensi untuk diaplikasikan dalam produk yang memerlukan interaksi dengan air, seperti minuman herbal, sementara senyawa nonpolar lebih cocok digunakan dalam formulasi berbasis minyak, seperti salep atau minyak atsiri. Pemahaman yang lebih mendalam mengenai karakteristik polaritas senyawa ini tidak hanya memperluas wawasan ilmiah tentang tanaman obat, tetapi juga membuka peluang untuk pengembangan produk inovatif di bidang farmasi dan makanan berbasis bahan alami, yang semakin diminati oleh konsumen modern.
Phytochemical analysis and Antibacterial Activity of Acetone Extract of Secang (Caesalpinia sappan L) Juwitaningsih, Tita; Sri Adelia Sari; Iis Siti Jahro; Neneng Windayani
Jurnal Jamu Indonesia Vol. 6 No. 2 (2021): Jurnal Jamu Indonesia
Publisher : Tropical Biopharmaca Research Center, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jji.v6i2.209

Abstract

In North Sumatra, the stem of the secang (Caesalpinia Sappan L) has been used in traditional medicine. This study aimed to conduct phytochemical analysis of the acetone extract of C. sappan and determine its antibacterial potency. Phytochemical test using 1H-NMR spectroscopy method andantibacterial activity were carried out on six pathogenic bacteria, including paper disc diffusion tests, determination of the minimum inhibitory concentration (MIC) using the microdilution method, and minimum bactericidal concentration (MBC). Based on 1H-NMR spectroscopic data, the acetone stem extract of C. Sappan L contains flavonoids and terpenoids and has activity against all tested bacteria with an inhibition zone in the range of 6.20 ± 0.53 - 10.93 ± 2.55 mm, MIC 312 - 5000 µg / mL and MBC 625-> 5000 µg / mL. The acetone extract of C. sappan showed the best activity against S. aureus ATCC 25923 with a MIC of 312 µg / mL. C. sappan L is a potential source of new antibacterial compounds.
Synthesis and Characterization of Hexathiosianatoiron(II) [Fe(NCS)6] 4- Complex Compound and Tetrapyridindithiosianatoiron(II) [Fe(NCS)2(Py)4] Complex Compound Febrianti, Fitria; Sutiani, Ani; Jahro, Iis Siti; Nugraha, Asep Wahyu; Fadhila, Nabila Nur
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 7 No. 1 (2024): JANUARY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i1.56440

Abstract

This research aims to synthesize and characterize the complex compounds Hexathiocyanatoiron(II) [Fe(NCS)6] 4- and Tetrapyridinedithiocyanatoiron(II) [Fe(NCS)2(Py)4]. The synthesis of these complex compounds was conducted in the Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Medan State University, while magnetic susceptibility measurements were carried out using the Magnetic Susceptibility Balance (MSB) instrument in the Inorganic Chemistry Laboratory, Bandung Institute of Technology. The complex compound synthesis involved the reaction of Iron(II) sulfate heptahydrate with Potassium thiocyanate and Pyridine compound in a 1:2 and 1:2:4 molar ratio. The synthesis process was conducted through a direct reaction method in a polar solvent. The obtained results include Hexathiocyanatoiron(II) complex compound, [Fe(NCS)6] 4-, which is pale yellow crystalline with a yield of 32.76%, and Tetrapyridinedithiocyanatoiron(II) complex compound, [Fe(NCS)2(Py)4] which is dark purple crystalline with a yield of 52.62%. These compounds exhibit a melting point of 219℃. Magnetic susceptibility measurements using the MSB instrument revealed a magnetic susceptibility of 6.69 BM (paramagnetic) for the Hexathiocyanatoiron(II) complex[Fe(NCS)6] 4-, and a magnetic moment of 5.61 BM (diamagnetic) for the Tetrapyridinedithiocyanatoiron(II ) complex [Fe(NCS)2(Py)4].
Synthesis of Zeolite from Rice Husk Ash Through Hydrothermal Process in Alkaline Condition Jahro, Iis Siti; Nursanni, Banu; Nugraha, Asep Wahyu; Juwitaningsih, Tita; Cindy, Cindy; Amalia, Meisya
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 7 No. 2 (2024): JULY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i2.62257

Abstract

People consider rice husks as agricultural waste. In Deliserdang Regency, in one year's period, 12,600 tons of ash are collected from the burning of around 70,000 tons of rice husk. The synthesis of zeolite from ash of rice husks was carried out by starting process of forming sodium silicate and aluminate compounds through the reaction with Al2O3 and NaOH in water on the room temperature for 10 hours. The results of reaction is refluxed at 70 ï‚°C for 3 hours. After being stored for around 12 hours at room temperature, the reflux process was continued at 120 ï‚°C for 8 hours. Infrared spectra of zeolite show an infrared absorption band in the area of around 440; 606; 745; and 1007 cm-1 which is the typical infrared absorption of zeolite X. This is supported by the XRD diffractogram with the diffraction peaks at 2 degree of 12.34; 17.51; 21.53; 27.90; 28.50 and 33.22 degrees.
The Effect of Hole Variation on The Performance of Catalytic Conventer from Pulp Waste with Zeolit X Catalyst from Rice Husk Ash Iis Siti Jahro; Moondra Zubir; Jasmidi; Putri Faradilla; Banu Nursanni; Tania Evelin
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 1 (2025): JANUARY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i1.68667

Abstract

The use of a catalytic converter in the exhaust is one solution to reduce pollutant levels in motor vehicle gas emissions. The catalytic converter was made using pulp waste and zeolite X from rice husk ash. This research examines the effect of varying number of holes 3, 5 and 7 on the absorption and conversion capacity of the catalytic converter. Making a catalytic converter from solid pulp waste consisting of grit, dreg and biosludge with the addition of zeolite synthesized from rice husk ash is carried out through the stages of granulating, mixing, molding and burning. The performance of the catalytic converter is measured using the Gas Analyzer shows that the catalytic converter with the 7 holes has the maximum absorption capacity for each motor vehicle gas emissions; CO, HC and CO2 respectively amounted to 39.06; 33.18 and 44.80% with an increase in O2 gas of 42.21%.
Co-Authors Adelia Yesya Putri Hasibuan Agnes Yuniarty Simbolon Aldo Geo Frengky Saragih Amalia, Meisya Anggun Maharani Angin, Jansen Riko Perangin Ani Sutiani Ani Sutiani Anisa Nursalsabillah Nasution Annisa Rahayu Annisa Rahayu Ardiansyah Ardiansyah Asep Wahyu Nugraha Asep Wahyu Nugraha Aulianti, Dita Ayi Darmana Ayi Darmana Ayi Darmana, Ayi Az Zahra, Salwa Banu Nursanni Bohari M. Yamin Bohari M. Yamin Br Bangun, Kurnia Wati Catur Kurniawan CINDY CINDY Daeli, Dinastini Damanik, Haryana Damanik, Syifa Namira Debora Putri Sitorus Debora Putri Sitorus Desri Berliana Daeli Djulia Onggo Djulia Onggo Djulia Onggo Dwi Rahmanisa Dwiyanda, Fadhilla Efrio Angelina Sitio Elit Manaman Gulo Esther Jacoba Martha Vertelman Fadhila, Nabila Nur Fahimah Martak Fitria Febrianti, Fitria Gavril Orlando Tumio Manalu Gurning, Mita Agresia Harahap, Dhini Haryati Hotma Br Butar Butar Hutagalung, Tien Parsaulian Hutagaol, Rahul Hutauruk, Rafli Intan Ayu Safitri Intan Fahira Yuzan Ismunandar Ismunandar . Ismunandar Ismu Izwani, Putri Khairi Jasmidi Jasmidi Jasmidi Juwitaningsih, Tita Khaira, Mutiah Khuzaimah Dasopang Maibang, Siti Rahmah MANIK, INDA WATI Manullang, Marisa Marham Sitorus Marpaung, Mutiara Evelin Yoseva Meli Sartika Silaban Moondra Zubir Mutia Patmasari Batubara Nasution, Anisa Nursalsabillah Nasution, Fadiya Malona Nasution, Rida Anastasia Nikita, Ade Rani Nurfajriani Nursanni, Banu Panjaitan, Nola Sari Petra van Koningsbruggen Pratama, Muhammad Rizky Putri Faradilla Putri Rizkia, Putri Putri Yustika Sary Rafida Khairani Ratu Evina Dibyantini Ratu Evina Dibyantini Regina Gresella Br Panjaitan Retno Dwi Suyanti Rode Juwita Sinaga Said, Fahrezi Hasyim Sakinah, Sheila Saragih, Innovayani Sarah, Arina Sami Sarnika Simbolon Sary, Putri Yustika SATI, NAFFA Sembiring, Niki Arih Ersada Br Sembiring, Silvia Gressiela Br Siahaan, Suria Bersinar Sihombing, Cindy Monalisa Sijabat, Hotman Priwaldi SIMANJUNTAK, PUTRINA Simanullang, Selafionita Simaremare, Happy G. Maritoma Simatupang, Septania Oniza Sinaga, Steven Siregar, Anggita Rahma Siregar, Eka Guspi Anti Sitorus, Francisca T. A Situmorang, Elsa Hasri Novensa Sri Adelia Sari Suryani Suryani Suryani Suryani Susanto Imam Rahayu Susanto Imam Rahayu Sutiani, Ani Syafira, Eka Ananda Syafitri, Amelia Syafriani Syafriani, Syafriani Syahputra, Ricky Andi Tama, Gita Citra Tania Evelin Turnip, Yulika Hotrina Vebilla May Ningsih Veronika, Christy Chirona Windayani, Neneng