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All Journal 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 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
Co-Authors Abdon Saiya Aisyiah Restutiningsih Putri Utami Br Tarigan, Romi Yana Widiawati Chaleb Paul Maanari Charold Septiano Paulus Claudya Gabby Lahinda Dewi Yul Launde Djefri Tani Djefry Tani Emma Julin Pongoh Fachry Abda El Rahman Fina Hamise Freetje Waworuntu I Dewe Ketut Anom Joice Dorsila Susana Caroles Maanari, Chaleb Maanari, Chaleb Paul Makarawung, Angga Anugrah Maria Enny Retno Sari Marlina Karundeng Miftahul Jannah Miftahul Jannah Miracle Lendo Mustapa, Mustapa Noverlin Gootoro Paat, Vlagia Indira Rauhe, Gilliant Ravelita Lastriawati Bullu Renfarak, Ana Arianti Rivya Tamungku Roos M. S. Tuerah Sanusi Gugule Sinaba, Berry Sofia Satriani Krisen Stefan Marco Rumengan Tengker, Soenandar M Tengker, Soenandar Millian Tompunu Varisky Abraham Dumanaw Yana Sambeka