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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Kimia Riset Journal of Science and Applicative Technology Pendas : Jurnah Ilmiah Pendidikan Dasar Chemistry Indonesian Journal of Chemical Research Jurnal Kartika Kimia Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Eduproxima : Jurnal Ilmiah Pendidikan IPA Indonesian Journal of Chemical Science and Technology Jurnal Teknologi Pendidikan : Jurnal Penelitian dan Pengembangan Pembelajaran Journal of Science and Science Education (JoSSEd) CHEDS: Journal of Chemistry, Education, and Science Jurnal Akademika Kimia JURNAL KELUARGA SEHAT SEJAHTERA
Ginting, Elfrida
Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jl. Willem Iskandar Psr. V, Medan, 20221, Sumatera Utara, Indonesia
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Application Of Jigsaw Type Cooperative Learning Model To Learning Outcomes And Motivation In Colloidal Materials Assisted By Practicum At SMA Negeri 1 Laubaleng Ginting, Tasya; Ginting, Elfrida
Jurnal Pendidikan dan Pembelajaran Kimia Vol 13, No 2 (2024): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Universitas Lampung

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

Abstract

Abstract:Application of Jigsaw-type Cooperative Learning Model to Learning Outcomes and Motivation in Pratctic-Assisted Colloidal Materials at SMA Negeri 1 Laubaleng. The learning model is a certain pattern or learning steps applied by teachers so that the goals of learning are achieved. The learning model applied in this study is a jigsaw-type cooperative learning model. The purpose of this study is to find out whether there is an increase in learning outcomes, student learning motivation and there is a significant correlation between learning motivation and student learning outcomes learned with a jigsaw-type cooperative model assisted by practicum on colloidal materials. The sample in this study was taken from two classes, namely class XI Science 1 which is called the experimental sample of 34 students who are taught with a jigsaw-type cooperative model assisted by practicum and XI Science 3 which is called the control sample of 34 students who are taught with a conventional model assisted by practicum, the sample is determined by random sampling technique, the results of the study show that the average learning outcome of students in the experimental class is 86.47 while the students in the control class 65.29; The average motivation of students in the experimental class while the students in the control class was 78.35 while the students in the control class were 64.24 and there was a significant correlation between student learning motivation and student learning outcomes learned by the JIGSAW-type cooperative model assisted by practicum, with a correlation coefficient of 0.92 and the contribution of student motivation to the improvement of student learning outcomes by 85% while 15% was influenced by other factors.Keywords: Jigsaw Type Cooperative, Learning Motivation, Learning Outcomes, Practicum, Colloid.DOI: 10.23960/jppk.v13i1.30278
PENGARUH PENERAPAN MODEL PEMBELAJARAN LANGSUNG BERBANTUAN MEDIA FLIPCHART TERHADAP HASIL BELAJAR TEKNIK TUMPANG TINDIH PADA ALAS PANAS SISWA KELAS XI SMK NEGERI 1 BERASTAGI Hutapea, Flora; Ginting, Elfrida
JURNAL KELUARGA SEHAT SEJAHTERA Vol 15 No 1 (2017): JURNAL KELUARGA SEHAT SEJAHTERA
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jkss.v15i29.7164

Abstract

ABSTRACT The research aims to know: 1) To know the results of learning overlap technique on the base of heat by using conventional learning model of students of class XI SMK Negeri 1 Berastagi. 2) To know the result of learning technique of overlap on the base of heat after using direct instruction model assisted by flipchart media of student of class XI SMK Negeri 1 Berastagi. 3) To know how far the influence of learning result of overlap technique on the base of heat after using direct instruction model assisted by flipchart media in class XI SMK Negeri 1 Berastagi. The population in this study are 97 students of class XI Kriya Tekstil SMK Negeri 1 Berastagi. Sampling technique using purposive sample that is sampling technique with certain considerations. The sample in this research is 64 students consisting of experiment class of 3 students and control class of 32 students, using quasi experiment method (Quasi experiment). The results of this research indicate that the level of trends in the results of learning overlap technique on the heat base of the class XI Kriya Tekstil SMK Negeri 1 Berastagi for experimental class tend to be very high at 75%. And the tendency level of overlap technique  learning result for the control class tends to be high but only 46,87%. To test the data normality using the Liliefors formula at a significant level of 0.05 with dk = 32, in obtaining the results of learning data overlap technique on the heat base of experimental class is normally distributebecause Lcount<Ltable (0.051592 <0.156) and control class with dk = 32, is normally distributed because Lcount<Ltable (0,018296 <0,156). Homogeneity test, obtained Fcount <Ftabel is 0,45 <1,83 so that both research class have the same variance (homogeneous). The result of hypothesis test by using t-test in obtaining tcount of 4,261 and ttable at significant level 0,05 with dk = 62 equal to 1,671. Thus tcount>ttable (4,261> 1,671). Therefore it can be concluded that there is an effect of the application of direct learning model assisted by flipchart media on the results of learning overlap technique on the heat base of students of class XI SMK Negeri 1 Berastagi. Based on the results of the calculation above, it can be seen that the application of direct learning model assisted by flipchart media is well used in SMK Negeri 1 Berastagi, especially in the sewing lesson. Kata Kunci: Model Pembelajaran Langsung berbantuan Media Flipchart, Teknik Tumpang Tindih
Comparison between Transesterification Reaction with Microwave Heating and Conventional Heating for Biodiesel Production from Coconut Oil with Alkaline Catalyst Boangmanalu, Srunika; Ginting, Elfrida
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 6 No. 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49364

Abstract

Biodiesel is a biofuel made from vegetable oil through an esterification-transesterification process. The process of making biodiesel is carried out by conventional heating methods and microwave heating. The reaction process was carried out according to the specified variables, with a concentration of 0.1% of the volume of methanol and a variable microwave power of 135, 225 and 315 watts with time variations of 5, 3 and 1 minute, as well as conventional heating at 60°C for 1 hour. The best result is the one using microwave heating with a power of 315 watts for 1 minute. The best biodiesel yield is 88.879%, with water content of 0.01%, an acid number of 0.56 Kg-KOH/g, a density of 0.892 g/mL and a viscosity of 2.617 cSt. The best result of biodiesel oil in comparison of is using the microwave heating method.
TRANSFORMASI PEMBAKARAN ARANG BATOK MENJADI ASAP CAIR DENGAN PENERAPAN SAINS TECHNO SEBAGAI DIVERSIFIKASI PRODUK UMKM USAHA ARANG BATOK Ginting, Elfrida; Simatupang, Lisnawaty; Sembiring, Jhony Hartanta
JURNAL PENGABDIAN KEPADA MASYARAKAT Vol. 31 No. 4 (2025): Oktober-Desember
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkm.v31i4.69207

Abstract

Mitra kegiatan ini adalah Usaha bersama Arang Batok di desa Patumbak Dua dusun IV kabupaten Deli Serdang. Dipimpin oleh Bapak Burman Siagian mulai beroperasi sejak tahun 2020 memiliki pekerja tetap 3 orang. Selama ini, pembakaran arang batok hanya menghasilkan arang sebagai produk utama, sementara potensi limbah asap yang dihasilkan belum dimanfaatkan secara optimal dan menjadi limbah yang menimbulkan dampak negatif. Padahal Konversi limbah asap arang batok menjadi produk yang mempunyai nilai ekonomi dan memiliki manfaat yang begitu banyak yakni: Pengawet Makanan Alami Pengendalian Hama pada industri pertanian, dan dapat digunakan dalam proses pengolahan limbah untuk mengurangi bau tidak sedap. Melalui kegiatan PKM penerapan teknologi destilasi pirolisis, asap hasil pembakaran arang batok dapat ditangkap, diolah, dan dikondensasi menjadi asap cair. Tim pengabdian memperkenalkan konsep sains techno dengan mengintegrasikan prinsip dasar kimia dan teknik pengolahan hasil pembakaran. Kegiatan pada Mitra IRT Arang batok diawali dengan Sosialisasi dan pelatihan; bagi mitra untuk meningkatkan pengetahuan dan Ketrampilan SDM dalam pengolahan asap pembakaran menjadi produk asap cair. Selanjutnya pelatihan pembuatan dan penerapan alat TTG Pirolisis kondensasi. Hasil kegiatan menunjukkan bahwa pengetahuan dan ketrampilan SDM dalam pengolahan asap pembakaran menjadi asap cair meningkat, Sebelum kegiatan hanya 1 orang yang mengetahui pengolahan asap cair setelah kegiatan 3 orang pekerja mengetahui (>100%). Sebelum kegiatan hanya memproduksi arang batok, dengan menggunakan TTG pirolisis kondensasi diperoleh pengolahan asap pembakaran menjadi produk asap cair dengan rendemen (40%) atau 40 kg dari pembakaran 160 kg batok kelapa grade 3. Diversifikasi produk membuat peningkatan jumlah tenaga kerja dari 3 pekerja menjadi 4-5 orang. Ada penambahan 2 orang pekerja untuk pengoperasian alat dan produk asap cair. Dengan adanya pengolahan asap pembakaran arang batok maka perekonomian dapat meningkatkan pendapatan dan kesejahteraan mitra (IRT Usaha Bersama Arang Batok) dan kesehatan masyarakat sekitar.
PENYEDIAAN BAHAN AJAR INOVATIF HIDROKARBON BERBASIS PROBLEM BASED-LEARNING TERINTEGRASI KEARIFAN LOKAL MINYAK KARO: penelitian pendidikan kimia Silaban, Ramlan; lespiani, ika; Daulay, Rabiah; Ginting, Elfrida; Sitorus, Marham
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 10 No. 03 (2025): Volume 10 No. 03 September 2025
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v10i03.31785

Abstract

The problem raised in this study is related to the way of teaching and learning in the classroom which is still teacher-oriented and the learning resources used have not connected the material with everyday life situations. This study aims to design a hydrocarbon learning module that links the local wisdom of Karo oil using the Problem Based Learning (PBL) approach. The method applied is Research and Development (R&D) with the 4D development model (Define, Design, Development, Disseminate). Evaluation of the module's feasibility was carried out by media experts, material experts, and chemistry teachers, and also through student responses. The results of the study showed that the module met the requirements for use in SMA Negeri 2 Kabanjahe, with a high average validation percentage. Student responses showed that this module was effective in increasing their interest and motivation in studying hydrocarbon material.
Simultaneous Saccharification and Fermentation of Sugarcane Bagasse by Saccharomyces Cerevisiae and Zymomonas Mobilis Ginting, Elfrida; Siregar, Ecclesia; Dewi, Ratna Sari; Simatupang, Lisnawaty; Yusfiani, Marnida; Sembiring, Jhony Hartanta
Indonesian Journal of Chemical Research Vol 13 No 3 (2026): Edition for January 2026
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2026.13-elf

Abstract

Sugarcane bagasse represents a promising lignocellulosic feedstock for second-generation bioethanol production. This study evaluated the performance of immobilized Simultaneous Saccharification and Fermentation (SSF) systems using Saccharomyces cerevisiae and Zymomonas mobilis for ethanol production from alkali-pretreated sugarcane bagasse. Delignification using 10% NaOH enhanced cellulose accessibility for enzymatic hydrolysis by immobilized Aspergillus niger. SSF was conducted under anaerobic conditions at 30°C for 80 h. Reducing sugar dynamics, physicochemical properties, FTIR spectra, and GC analysis were used to evaluate ethanol formation and quality. The SSF system employing S. cerevisiae produced a higher ethanol concentration (2.83% v/v) and purity (99.77%) compared to Z. mobilis (2.20% v/v; 89.92%). Although higher residual reducing sugars were observed in the Z. mobilis system, ethanol conversion efficiency remained lower, indicating metabolic limitations under SSF conditions. FTIR and GC analyses confirmed ethanol formation with high water content in both distillates. These results demonstrate that microbial robustness plays a critical role in immobilized SSF performance, with S. cerevisiae exhibiting superior fermentative stability and ethanol yield compared to Z. mobilis.
A Study Compares The Effectiveness of Hydrochloric and Sulfuric Acids in Hydrolyzing Jackfruit Seeds into Bioethanol Ginting, Elfrida; Simatupang, Lisnawaty; Sembiring, Jhony H.
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp174-180

Abstract

North Sumatera Province, known for its jackfruit production, presents an opportunity to explore jackfruit seeds as a viable bioethanol feedstock. The province’s diverse agricultural commodities generate substantial agricultural waste, currently primarily used as fertilizer. This research aims to diversify waste utilization by focusing on jackfruit, a prominent commodity in North Sumatera, and its potential as a bioethanol feedstock. Given the scarcity of fossil fuels, exploring renewable energy sources, such as bioethanol derived from agricultural waste, is crucial. Identifying accessible sources within regions is vital. Converting jackfruit seed starch into bioethanol requires hydrolysis. This paper compares hydrochloric and sulfuric acid for bioethanol production. Qualitative testing confirmed the presence of bioethanol from both acids. The density of bioethanol produced using hydrochloric acid was 0.825 g/mL, 3.4% higher than the Indonesian standard value. Similarly, the density of bioethanol produced using sulfuric acid was 0.894 g/mL, 12% higher than the standard value. The viscosity of bioethanol produced using hydrochloric acid was 1.02 cp, 12% lower than the standard value. In contrast, bioethanol produced using sulfuric acid had a viscosity of 1.04 cp, 11% lower than the standard value. FTIR spectra of bioethanol treated with hydrochloric acid showed five prominent peaks: 3339.88 cm-1 (OH), 2953.35 cm-1 (-CH), 1643.79 cm-1 (-C-C), 1450.75 cm-1 (-CH3), and 1014.17 cm-1 (-CO). FTIR spectra of bioethanol treated with sulfuric acid showed only two major peaks at 3339.46 cm-1 and 1635.42 cm-1, both corresponding to -OH and -CH. The NMR spectra show three distinct peaks. In ethanol’s proton NMR spectrum, the first doublet at 1.71 and 1.61 ppm is the methyl group protons. The second peak at 2.02 ppm is the hydroxyl group proton. The third doublet at 3.59–3.62 ppm is the methylene group protons. All methods indicate that hydrochloric acid is a more effective hydrolytic agent than sulfuric acid.
ANALYSIS OF STUDENT MISCONCEPTIONS IN LEARNING BUFFER SOLUTION MATERIAL USING FOUR-TIER TEST WITH CERTAINTY OF RESPONSE INDEX METHOD Sihite, Miranda Anggelina; Ginting, Elfrida
EDUPROXIMA : Jurnal Ilmiah Pendidikan IPA Vol 7, No 1 (2025)
Publisher : Universitas Bhinneka PGRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29100/.v7i1.6002

Abstract

This research aims to identify students' misconceptions about buffer solution material. This type of research uses a descriptive quantitative approach. The subjects in this research were 33 students from one class XI Science at SMA Negeri 1 Girsang Sipangan Bolon using a purposive sampling technique. The data analysis technique uses interpretation of the results of the four-tier diagnostic test with Certainty Response Index. Based on the results of data analysis, it is known that the percentage of misconceptions is 41%, not understanding concepts 32%, and understanding concepts 27%. The misconceptions that occur are in the medium category. The misconception profile for each buffer solution sub-material as follows: definition and properties of buffer solutions 37,6%, components of the buffer solution 42,5%, calculation of the pH value of the buffer solution 44%, and the role of buffer solutions for living things 40,6%. The biggest misconception sub-material is calculation of the pH value of the buffer solution 44%. The smallest misconception sub-material is definition and properties of buffer solutions 37,6%. The results of the research found that there are still many students who experience misconceptions, so further research needs to be carried out to identify student misconceptions in other materials. 
Biodiesel Conversion from Used Cooking Oil: An Eggshell-Based ZnO/CaO Supported on Activated Carbon Catalyst with Microwave Heating Ginting, Elfrida; Ginting, Amalia Anggreni; Simatupang, Lisnawaty; Sembiring, Jhony Hartanta; Ginting, Victor Eralingga
Jurnal Kartika Kimia Vol 8 No 2 (2025): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v8i2.994

Abstract

Fossil fuels, such as petroleum, are non-renewable and have been exploited for decades, necessitating alternative energy solutions. Biodiesel reduces reliance on fossil fuels and mitigates their environmental impact. This research converts used cooking oil into biodiesel through chemical reactions—esterification and transesterification—that transform oils into biodiesel. Microwave heating accelerates reaction rates and reduces process times compared to conventional heating. A CaO catalyst derived from eggshells, impregnated with ZnO and supported by activated carbon, was chosen for its sustainability and enhanced catalytic activity. The study aims at determining the optimal conversion time for transforming used cooking oil into biodiesel according to SNI 7182-2015, using FT-IR and GC-MS analyses to assess chemical composition and purity. XRD and SAA confirmed the formation of CaO and a surface area of 3.822 m²/g. Microwave heating times of 4-8 minutes at 600 watts were tested, with the highest yield (89.62%) achieved in 5 minutes. This meets SNI 7182-2015 standards for density, kinematic viscosity, acid number, and saponification number. GC-MS identified cis-13-octadecenoic acid methyl ester (52.69%), pentadecanoic acid 14-methyl methyl ester (31.89%), and methyl stearate (6.14%) as the main components. These results demonstrate sustainable biodiesel production from waste cooking oil using environmentally friendly catalysts, reducing reliance on fossil fuels.
Co-Authors Alex Suhendra Munte Bajoka Nainggolan Boangmanalu, Srunika Daulay, Rabiah Dea Gracella Siagian Dewi Syafriani, Dewi Elfrida Siregar Flora Hutapea, Flora Ginting, Amalia Anggreni Ginting, Tasya Ginting, Victor Eralingga Herlinawati Herlinawati Ida Duma Riris Jhony Hartanta Sembiring Junifa Layla Sihombing Kristian Adinata Pratama Simatupang lespiani, ika Lisnawaty Simatupang Lisnawaty Simatupang Marham Sitorus Nora Susanti Ramlan Silaban Ratna Sari Dewi Ratu Evina Dibyantini Rikson Siburian Saragih, Hasri Tri Maya Sembiring, Jhony H. Sihite, Miranda Anggelina Simatupang, Lisnawaty Simatupang, Lisnawaty Siregar, Ecclesia Situmeang, Amanda Zefanya Syahputra, Ricky Andi Tampubolon, Cindy Claudin Yusfiani, Marnida Zuhairiah Nasution, Zuhairiah