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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 Jurnal Kartika Kimia Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) 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 Jurnal Pendidikan Kimia FKIP Universitas Halu Oleo
Ginting, Elfrida
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Negeri Medan, Medan 20221|Universitas Negeri Medan|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.
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.
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.
TRANSFORMASI PEMBAKARAN ARANG BATOK MENJADI ASAP CAIR DENGAN PENERAPAN SAINS TECHNO SEBAGAI DIVERSIFIKASI PRODUK UMKM USAHA ARANG BATOK Elfrida Ginting; Lisnawaty Simatupang; Jhony Hartanta Sembiring
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.
A Study Compares The Effectiveness of Hydrochloric and Sulfuric Acids in Hydrolyzing Jackfruit Seeds into Bioethanol Elfrida Ginting; Lisnawaty Simatupang; Jhony H. Sembiring
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.
Pengaruh Model Pembelajaran Discovery Learning Berbantuan Media Wordwall terhadap Motivasi dan Hasil Belajar Siswa pada Materi Laju Reaksi Tulus Panindoan Lumbantobing; Ida Duma Riris; Bajoka Nainggolan; Dewi Syafriani; Elfrida Ginting
Jurnal Pendidikan Kimia FKIP Universitas Halu Oleo Vol. 10 No. 1 (2025): April 2025
Publisher : Jurusan Pendidikan Kimia Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36709/jpkim.v10i1.155

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran Discovery Learning berbantuan media Wordwall terhadap motivasi, hasil belajar siswa dan korelasi.  Metode penelitian ini adalah eksperimen kuasi terdiri dari kelas eksperimen dan kontrol dengan sampel sebanyak 62 siswa.  Hasil yang diperoleh bahwa nilai rata-rata hasil belajar pretest dan postest dikelas eksperimen dan kontrol sebesar: 34,19 ± 6,069 dan 86,29 ± 6,187. Angka ini menunjukkan adanya peningkatan hasil belajar siswa setelah diimplementasikannya model pembelajaran Discovery Learning yang berbantuan  media Wordwall pada materi Laju Reaksi  dan motivasi belajar siswa didapatkan adalah 88,92%, menunjukkan bahwa motivasi belajar siswa dalam kelas eksperimen berada pada tingkat yang sangat tinggi. Selain itu, ada pengaruh model pembelajaran Discovery Learning berbantuan media Wordwall terhadap hasil belajar siswa, ditunjukkan dengan nilai Sig (2-tailed) sebesar 0,004, yang kurang dari α (0,05). Ditemukan adanya hubungan korelasi  motivasi belajar dengan hasil belajar siswa. Namun tidak termasuk di dalam kategori tinggi
Synthesis and Characterization of Biodiesel from Coconut Oil Using Renewable ZnO/CaO-CA Catalyst with Microwave Heating Surya Julius Sembiring; Lisnawaty Simatupang; Jhony Hartanta Sembiring; Elfrida Ginting
Jurnal Kimia Riset Vol. 11 No. 1 (2026): June
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkimris.v11i1.74231

Abstract

Biodiesel is a type of liquid fuel produced from vegetable oil and has combustion properties similar to diesel fuel, which is processed through esterification-transesterification as an alternative to fossil fuels. This study aims to optimize the esterification-transesterification process by examining the effect of time on the conversion of coconut oil into biodiesel based on the suitability of SNI 7182-2015. The methodology used involves microwave heating. Biodiesel is synthesized using CaO catalyst derived from fish bone waste impregnated with ZnO and activated carbon support. Catalyst preparation is carried out through impregnation, followed by calcination at 500℃. The characterization of the ZnO/CaO-CA catalyst was performed using X-Ray Diffraction (XRD), Thermogravimetric Analysis (TGA), and Surface Area Analyzer (SAA) using the Brunauer-Emmett-Teller (BET) method. This was followed by an esterification-transesterification process with varying times of 4, 5, 6, 7, and 8 minutes at a power of 600 watts. The results of the ZnO/CaO-CA catalyst characterization analysis in the XRD analysis of the single CaO catalyst and the ZnO/CaO-CA catalyst at 2θ were 2θ = 32.22°, 37.98°, and 53.20°, and 2θ = 31.75°, 34.43°, and 36.24°, respectively. The TGA analysis results showed thermal stability with a midpoint at 271.82℃. The SAA analysis results using the BET method showed a surface area of 5.0919 m²/g, a pore volume of 17.6×10⁻³, and a pore diameter of 22.1270 nm. Biodiesel characterization was performed on the transesterification product at the optimal time of 5 minutes using FTIR and GCMS. FTIR analysis revealed the functional groups of methyl esters, namely the methyl group (C-H) and ester groups (C-O), (C=O). GC-MS analysis identified the optimal biodiesel components as octanoic acid (3.07%), decanoic acid (5.81%), dodecanoic acid (20.48%), methyl tetradecanoate (21.33%), and hexadecanoic acid (17.50%).
Co-Authors Alex Suhendra Munte Bajoka Nainggolan Boangmanalu, Srunika Daulay, Rabiah Dea Gracella Siagian Dewi Syafriani Dewi Syafriani, Dewi Elfrida Siregar Flora Hutapea, Flora Ginting, Amalia Anggreni Ginting, Tasya Ginting, Victor Eralingga Herlinawati Herlinawati Ida Duma Riris Jhony H. Sembiring Jhony Hartanta Sembiring Jhony Hartanta Sembiring Jhony Hartanta Sembiring Junifa Layla Sihombing Kristian Adinata Pratama Simatupang lespiani, ika Lisnawaty Simatupang Lisnawaty Simatupang Lisnawaty Simatupang Marham Sitorus Nora Susanti Ramlan Silaban Ratu Evina Dibyantini Rikson Siburian Saragih, Hasri Tri Maya Simatupang, Lisnawaty Simatupang, Lisnawaty Situmeang, Amanda Zefanya Surya Julius Sembiring Syahputra, Ricky Andi Tampubolon, Cindy Claudin Tulus Panindoan Lumbantobing Zuhairiah Nasution, Zuhairiah