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All Journal JKPK (Jurnal Kimia dan Pendidikan Kimia) Fullerene Journal of Chemistry SOSCIED Oxygenius Journal Of Chemistry Education Sciening : Science Learning Journal Jurnal Ilmiah Wahana Pendidikan Switch: Jurnal Sains dan Teknologi Informasi
Jeanne M. Tuerah
Universitas Negeri Manado
Religion Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Environmental Science Social Sciences Other

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Pengaruh Katalis Terhadap Rendemen Reaksi Transesterifikasi Br Tarigan, Romi Yana Widiawati; Gugule, Sanusi; Tuerah, Jeanne Maria; Maanari, Chaleb
Jurnal Kimia Fullerene Vol 8 No 2 (2023): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v8i2.494

Abstract

Research has been carried out on the effect of a catalyst on the yield of transesterification reactions. Pure coconut oil is made mechanically without heating using fresh coconut meat or what is called non-copra, followed by a base-catalyzed transesterification reaction using KOH and NaOH. The purpose of this study was to determine the effect of the catalyst on the yield of the transesterification reaction. The results of the reaction were analyzed by determining the physico-chemical properties and analysis of Gas Chromatography-Mass Spectrometry (GC-SM). The results showed that the average reaction yield with KOH catalyst was 74.3% and 70% NaOH catalyst. The most dominant GC-SM identification results were ethyl caproate 4.12%, ethyl capricate 4.99%, ethyl laurate 54.97%, ethyl myristate 18.49%, ethyl palmitate 8.13%, 9.12 octadecatrin-1-ol 5.24% and ethyl strearate 2.28%.
Uji Validitas Sebagai Penentuan Kualitas Butir Soal Pilihan Ganda "Pacu Kimia" FMIPAK Unima Waworuntu, Freetje; Tuerah, Jeanne M; Tengker, Soenandar M; Saiya, Abdon; Paat, Vlagia; Rumengan, Stefan
Oxygenius: Journal Of Chemistry Education Vol 6 No 1 (2024): Oxygenius : Journal Of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v6i1.680

Abstract

The purpose of this research is to determine the quality of multiple-choice items in the "Chemistry Boost" test from FMIPAK Unima, based on responses from 80 high school students answering 40 items. The validity test used a combination of Discrimination Index (DI) and Difficulty Level (DL). DI has 6 categories: Very Good, Good Enough, Marginal, Poor Discrimination, Negative, while DL consists of 6 categories: Discarded, Very Easy, Easy, Maintained, Very Difficult, and Reviewed for deficiencies or taught. The results obtained are 23 valid items, or 57.5%. Based on the results, the cognitive processes of Anderson's revised Bloom Taxonomy were determined, with valid items in C1, C2, C3, C4, C5, and C6 being 2, 2, 12, 6, 0, respectively. Items categorized as Higher Order Thinking Skills (HOTS) are in C4 and C5, totaling 18 items. Valid chemistry topics include Acid-Base, Atomic Structure, Stoichiometry, and Reaction Rates. Topics less understood by participants include Compounds and Chemical Formulas, Solubility, Chemical Equilibrium, Ionization Energy, Redox, Electrochemistry, and Hydrocarbons.
OPTIMASI KONSENTRASI LARUTAN KAPUR SIRIH UNTUK MENETRALKAN ASAM LEMAK BEBAS (ALB) PADA MINYAK GORENG Sinaba, Berry; Tani, Djefri; Tuerah, Jeanne
Oxygenius: Journal Of Chemistry Education Vol 7 No 2 (2025): Oxygenius : Journal Of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

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Abstract

Oil is a triglyceride compound that is liquid at room temperature. Oil can experience changes in aroma and taste during storage. To overcome the damage to the oil, neutralization is carried out. Neutralization is a process to break free fatty acids from oil or fat, by reacting free fatty acids with bases or other reagents, thus forming soap (soap stock) with the aim of purifying oil, reducing residual gum, improving taste, and reducing darkness from the oil. Neutralization can be done in various ways, namely by using alkali, sodium carbonate, ammonia, or by using steam. This study aims to determine the optimum concentration of whiting solution in neutralizing free fatty acids. Neutralization was carried out with several concentrations, namely 10%, 12%, 14%, 16%, 18%, 20%. The test parameters in this study were free fatty acid content, acid number, peroxide value and water content. Based on the results obtained the optimum concentration was 16% with free fatty acids 0.1781, acid number 0.25, peroxide number 4.39, water content 0.39.
Peningkatan Hasil Belajar Stokiometri pada Kuliah Kimia Dasar Menggunakan Pendekatan Flipped Classroom Rumengan, Stefan Marco; Maanari, Chaleb Paul; Utami, Aisyiah Restutiningsih Putri; Mustapa, Mustapa; Jannah, Miftahul; Paat, Vlagia Indira; Dumanauw, Varisky Abraham; Tuerah, Jeanne Maria; Karundeng, Marlina; Sambeka, Yana
SCIENING : Science Learning Journal Vol. 5 No. 1: Juni 2024
Publisher : Jurusan Pendidikan IPA FMIPAK Universitas Negeri Manado

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Abstract

Flipped classroom< em> merupakan pendekatan pembelajaran di mana isi materi dan keterampilan yang biasanya diajarkan selama sesi kelas disampaikan di luar kelas Penelitian ini bertujuan untuk mengevaluasi peningkatan hasil belajar mahasiswa dengan menggunakan model pembelajaran flipped classroom< em> pada materi stokiometri dalam kuliah kimia dasar Metode penelitian yang digunakan adalah penelitian kuantitatif dengan metode eksperimen dan desain one group pretest posttest< em> Sampel penelitian terdiri dari 35 mahasiswa kelas A di program studi pendidikan matematika Universitas Negeri Manado Unima Data dikumpulkan melalui tes hasil belajar dengan memberikan pretest< em> sebelum proses perkuliahan dan posttest< em> setelah proses perkuliahan dilaksanakan Hasil penelitian menunjukkan bahwa rata rata hasil belajar mahasiswa pada pretest< em> adalah 49 33 sedangkan pada posttest< em> meningkat menjadi 87 33 Pengujian N Gain score< em> menunjukkan skor sebesar 77 yang masuk dalam kategori efektif dan tinggi Berdasarkan temuan tersebut dapat disimpulkan bahwa penerapan model flipped classroom< em> secara efektif dan signifikan meningkatkan hasil belajar mahasiswa pada materi stokiometri dalam kuliah kimia dasar di program studi pendidikan matematika Unima < p>
Effect of Phosphoric Acid (H3PO4) Activation on the Preparation of Activated Carbon from Gymnostoma Rumphianum Wood Soenandar Milian Tompunu Tengker; Jeanne Maria Tuerah; Pamela Lumingas; Miftahul Jannah; Stefan Marco Rumengan; Alfrie Musa Rampengan
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 10, No 2 (2025): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v10i2.107623

Abstract

The utilization of Roya wood branches (RWB) as raw material for activated charcoal production has not yet been optimized in North Sulawesi, specifically in Wulauan Village, North Tondano District. This study aims to present the results of the analysis of the physical and chemical properties, X-Ray Diffraction (XRD), and Transmission Electron Microscope (TEM) of RWB-based activated charcoal. The production of activated charcoal was conducted in three stages: sample preparation, pyrolysis of RWB at a temperature of 365°C for approximately 3 hours, and activation of RWB charcoal using phosphoric acid (H₃PO₄) at concentrations of 1%, 2%, and 3% for 24 hours. The analysis of physical and chemical properties of both non-activated and H₃PO₄-activated RWB activated charcoal showed that the best quality was obtained at a 3% activator concentration, with a moisture content of 0.1683%, ash content of 2.3321%, volatile matter content (VMC) of 0.9429%, fixed carbon (FC) content of 96.7250%, and iodine adsorption capacity (IAC) of 10,535 mg/g, all of which meet the SNI 06-3037-1995 for activated charcoal. XRD analysis showed that non-activated RWB charcoal had three broad diffraction peaks in the ranges of 9–14°, 20–25°, and 35–50°, along with one sharp peak in the range of 25–30°. After activation with H₃PO₄, only three broad diffraction peaks were observed at 9–14°, 20–25°, and 35–50° for all three H₃PO₄ concentration variations.TEM analysis indicated that non-activated RWB charcoal had particle sizes ranging from 20–33 nm, while after activation with 1% H₃PO₄, the particle sizes ranged from 41–51 nm.
Co-Authors Abdon Saiya Aisyiah Restutiningsih Putri Utami Alfrie Musa Rampengan Br Tarigan, Romi Yana Widiawati Chaleb Paul Maanari Charold Septiano Paulus Claudya Gabby Lahinda Dewi Yul Launde Djefry Tani Emma Julin Pongoh Fina Hamise Freetje Waworuntu I Dewe Ketut Anom Joice Dorsila Susana Caroles Makarawung, Angga Anugrah Maria Enny Retno Sari Marlina Karundeng Miftahul Jannah Miftahul Jannah Miftahul Jannah Miracle Lendo Mustapa Mustapa Noverlin Gootoro Paat, Vlagia Indira Pamela Lumingas Rauhe, Gilliant Ravelita Lastriawati Bullu Renfarak, Ana Arianti Rivya Tamungku Roos M. S. Tuerah Sanusi Gugule Sinaba, Berry Sofia Satriani Krisen Stefan Marco Rumengan Stefan Marco Rumengan Tengker, Soenandar Millian Tompunu Varisky Abraham Dumanaw Yana Sambeka