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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) Jurnal Kimia Riset Journal of Science and Applicative Technology 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
Ginting, Elfrida
Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jl. Willem Iskandar Psr. V, Medan, 20221, Sumatera Utara, Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics Social Sciences Other

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Hubungan Self-Efficacy dan Kemampuan Berpikir Kreatif dengan Hasil Belajar Kimia Siswa SMA Nora Susanti; Lisnawaty Simatupang; Ratu Evina Dibyantini; Ricky Andi Syahputra; Elfrida Ginting
Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Vol 4, No 2 (2022): OKTOBER 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jipk.v4i2.39486

Abstract

The quality of an education always refers to the results or academic achievements achieved by students. Chemistry can be a place or means for students to practice critical thinking skills, be creative and be able to solve problems where students relate them to everyday phenomena. Certainly, there are many factors that influence the success of students in learning chemistry. This study aims to determine the relationship between self-efficacy and creative thinking skills with student chemistry learning outcomes. The sample of this study was 50 students of class XI taken by random sampling technique. Data were collected using a self-efficacy questionnaire as well as creative thinking ability tests and chemistry learning outcomes tests. Data analysis using multiple linear regression test. The results showed that there was a positive and significant relationship between self-efficacy and student chemistry learning outcomes, there was a positive and significant relationship between creative thinking skills and student chemistry learning outcomes; there is a significant and simultaneous relationship between self-efficacy and creative thinking skills with student chemistry learning outcomes with a coefficient of determination of 36.2%.Kualitas suatu pendidikan selalu mengacu pada hasil atau prestasi akademik yang dicapai oleh peserta didik. Ilmu kimia dapat menjadi wadah atau sarana bagi siswa untuk melatih kemampuan berpikit kritis, kreatif dan mampu memecahkan masalah dimana siswa mengaitkannya dengan fenomena sehari-hari. Tentunya ada banyak faktor yang mempengaruhi keberhasilan siswa dalam belajar kimia. Penelitian ini bertujuan untuk mengetahui hubungan self-efficacy dan kemampuan berpikir kreatif dengan hasil belajar kimia siswa. Sampel penelitian ini adalah siswa kelas XI sebanyak 50 orang yang diambil dengan teknik random sampling. Data dikumpulkan menggunakan angket self-efficacy serta tes kemampuan berpikir kreatif dan tes hasil belajar kimia. Analisis data menggunakan uji regresi linier berganda. Hasil penelitian menunjukkan bahwa terdapat hubungan yang positif dan signifikan antara self-efficacy dengan hasil belajar kimia siswa, terdapat hubungan yang positif dan signifikan antara kemampuan berpikir kreatif dengan hasil belajar kimia siswa; terdapat hubungan yang signifikan dan simultan antara self-efficacy dan kemampuan berpikir kreatif dengan hasil belajar kimia siswa dengan koefisien determinasi sebesar 36,2%.
Kinerja Ratio Silika-Cat Dengan Metode Dipcoating Pada Permukaan Logam Untuk Penghambat Laju Korosi Lisnawaty Simatupang; Rikson Siburian; Elfrida Ginting; Junifa Layla Sihombing; Herlinawati Herlinawati; Alex Suhendra Munte; Kristian Adinata Pratama Simatupang; Dea Gracella Siagian
Journal of Science and Applicative Technology Vol 7 No 1 (2023): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v7i1.1311

Abstract

Silica oxide (SiO2) is a chemical compound that can be obtained from the extraction of volcanic ash from Mount Sinabung. Silicon dioxide has the properties of high porosity, high mechanical strength, high thermal stability, large pore surface area, stable surface in acidic media so that it can be applied in the chemical coating field.This research aims to measurement of performance natural silica from volcanic ash of mount Sinabung Indonesia as additives to the paint to inhibit corrosion rate in metal surface. The addition of silica additives to the paint was carried out by dispersing (0; 0.5; 0.75; and 1) g with 10 mL of paint with each composition carried out for 60 minutes. Iron plate in sandpaper with 1500 grid and polished with bludru cloth using autosol metal polish, then coated with paint and a combination of silica-paint through the dipcoating method. The corrosion test was carried out on a corrosive solution of HCl 15% (v/v) and NaCl 3.5% (w/v). The corrosion rate using HCl 15% (v/v) showed C (0,286) mpy, SC1 (0,123) mpy, SC2 (0,149) mpy, SC3 (0,120) mpy. While at 3.5% (w/v) NaCl, namely C (0,282) mpy, SC1 (0,120) mpy, SC2 (0,142) mpy, SC3 (0,098) mpy. Inhibitor efficiency for various variations of silica composition in corrosive HCl 15%(v/v) solution, e.g., SC1 (56,9%), SC2 (47,9%), and SC3 (58,04%). The inhibitor efficiency at various compositions of silica in NaCl 3.5% (w/v) are SC1 (57,44%), SC2 (49%) dan SC3 (65,24%).
Production of Biodiesel from Candlenut Seed Oil (Aleurites Moluccana Wild) Using a NaOH/CaO/Ca Catalyst with Microwave Heating Elfrida Siregar; Lisnawaty Simatupang; Jhony Hartanta Sembiring; Elfrida Ginting
Jurnal Kimia Sains dan Aplikasi Vol 27, No 1 (2024): Volume 27 Issue 1 Year 2024
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.27.1.21-27

Abstract

Oil fuels derived from fossils are non-renewable, so over time, they will run out and have a negative impact on air pollution. To overcome this, there is a need for environmentally friendly alternative fuels from renewable sources such as biodiesel. This research used microwave heating with a CaO catalyst. NaOH-impregnated snail shells and active carbon support. This research aims to determine the effect of power on the conversion of candlenut seed oil into biodiesel using the NaOH/CaO/CA catalyst both in terms of compliance with the SNI 7182-2015 standard and analysis using GC-MS (Gas Chromatography-Mass Spectrometry). The synthesis of the NaOH/CaO/CA catalyst was carried out through wet impregnation and calcination at a temperature of 500°C and analyzed using gas sorption analysis (GSA). Then proceed to the transesterification process, where the power for microwave heating was varied to 300, 450, and 600 watts with a mole ratio of esterified oil and methanol, namely 1:10 for 3 minutes. The analysis results of the NaOH/CaO/CA catalyst using the GSA instrument have a surface area of 9.306 m2/g, pore volume of 0.033 cc/g, and pore diameter of 14.043 nm. Meanwhile, the results of the biodiesel analysis showed that the optimum biodiesel yield was 85.625% at 600 watts of power and had a kinematic density and viscosity that met the SNI 7182-2015 biodiesel standards. Analysis of biodiesel characteristics using GC-MS showed that the three most optimum biodiesel components were hexadecanoic acid, methyl ester (22.664%), 9,12-Octadedecadienoic acid (Z,Z)-, methyl ester (30.176%) and 9-Octadecenoic acid (Z)-, methyl ester (38.656%).
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
CONVERSION OF PINEAPPLE PEEL GLUCOSE INTO BIOETHANOL USING SIMULTANEOUS SACCHARIFICATION AND FERMENTATION (SSF) METHOD AND SEPARATE HYDROLYSIS AND FERMENTATION (SHF) METHOD Saragih, Hasri Tri Maya; Sembiring, Jhony Hartanta; Ginting, Elfrida
Jurnal Kimia Riset Vol. 8 No. 2 (2023): December
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v8i2.50581

Abstract

This study aims to determine the bioethanol yield and characteristics from pineapple peel with two methods such as Simultaneous Saccharification and Fermentation (SSF) and Separate Hydrolysis and Fermentation (SHF). The percent yield of bioethanol produced from the fermentation of pineapple peel (Ananas comosus) with the Simultaneous Saccharification and Fermentation method was 63.50%, while the yield of bioethanol from the Separate Hydrolysis and Fermentation method was 58.75%. The physical characteristics of bioethanol pineapple peel waste using Simultaneous Saccharification and Fermentation method has a density of 0.8237 w/v whilst with Separate Hydrolysis and Fermentation is 0.8858 w/v. Furthermore, viscosity of bioethanol using Simultaneous Saccharification and Fermentation is 1.05 Cp whereas using Separate Hydrolysis and Fermentation is 1.02 Cp. Pineapple peel bioethanol method of Simultaneous Saccharification and Fermentation has concentration of 13% while Separate Hydrolysis and Fermentation method has concentration of 7.92%. FTIR spectra from SHF bioethanol missing the peak correlated with CH, CH3, and CO. These missing peaks is due to the high percentage of water. Furthermore, bioethanol from SSF method showed peaks corresponding to CH, CH3, and CO functional groups. It can be concluded that SSF method give bioethanol with optimum result.  
Difference Model Problem Based Learning (PBL) and Discovery Learning (Dl) on Results Study and Motivation Study Students At Bonding Materials Chemistry in Senior High School Situmeang, Amanda Zefanya; Ginting, Elfrida
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.v9i2.11202

Abstract

This research aims to: (1) determine the differences in student learning outcomes taught using the Problem Based Learning (PBL) and Discovery Learning (DL) models on chemical bonding material. (2) determine the differences in students' learning motivation who are taught using the Problem Based Learning (PBL) and Discovery Learning (DL) models on chemical bond material. (3) there is a correlation between motivation and learning outcomes of students who are taught using the Problem Based Learning (PBL) and Discovery Learning (DL) models on chemical bond material. This research was conducted at SMAN 11 Medan with the samples studied were X-3 and X-7. The instrument used is a test instrument in the form of multiple choice questions with 20 validated questions and a non-test in the form of a learning motivation questionnaire. Data analysis techniques are carried out by: Data normality test, data homogeneity test, hypothesis test, and correlation test. The results obtained: (1) There are differences in student learning outcomes taught using the Problem Based Learning and Discovery Learning models on chemical bonding material. The average student learning outcomes in experimental class I using Problem Based Learning was 74.8. Meanwhile, the average learning outcome for experimental class II using the Discovery Learning model was 79.6. (2) There were differences in the learning motivation of students who were taught using the Problem Based Learning and Discovery Learning models on chemical bond material. Meanwhile, the average learning motivation of students in experimental class I using Problem Based Learning is 67.6. Meanwhile, the average learning motivation in experimental class II which was taught using the Discovery learning model was 72.5. (3) There is a correlation between students and learning outcomes taught using the Problem Based Learning and Discovery Learning models on chemical bond material with a positive correlation value. In experimental class I obtained Sig. = 0.00 with Pearson Correlation = 0.795 and experimental class II Sig. = 0.000 with Pearson Correlation = 0.879.
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.
ANALISA 1H NMR (NUCLEAR MAGNETIC RESONANCE) BIOETHANOL DARI BIJI DURIAN (DURIO ZIBETHINUS) MENGGUNAKAN METODE SEPARATION HYDROLYSIS AND FERMENTATION (SHF) Ginting, Elfrida; Nasution, Zuhairiah; Sembiring, Jhony Hartanta
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 2 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i2.10146

Abstract

Energi fosil semakin berkurang drastis dan membutuhkan energi alternatif terbarukan. Salah satu energi alternatif adalah bioetanol. Dari sekian banyak penelitian yang dilakukan, masih jarang yang menggunakan spektrometri 1H-NMR sebagai alat analisis. Oleh karena itu dibuat bioetanol dari biji durian kemudian dianalisis menggunakan 1H-NMR. Tujuan penelitian ini adalah menganalisis bioetanol dari biji durian menggunakan spektrometri 1H-NMR. Bioetanol dari biji durian diproduksi dengan metode pemisahan hidrolisis dan fermentasi (SHF). 1H-NMR dapat menentukan keberadaan hidrogen dalam CH3, hidrogen dalam CH2, dan Hidrogen dalam OH. Spektra 1H-NMR menunjukkan puncak pada 1,2 ppm yaitu hidrogen pada CH3, puncak pada 3,5 ppm yaitu Hidrogen pada CH2, dan puncak pada 3,7 ppm yaitu Hidrogen pada OH. Puncak OH bergeser ke arah yang lebih rendah yaitu 3,7 ppm
The Effect of Project Based Learning Model (PjBL) Assisted by KOKAMI Media on Motivation and Learning Outcomes on Chemical Equilibrium Material Tampubolon, Cindy Claudin; Riris, Ida Duma; Nainggolan, Bajoka; Syafriani, Dewi; Ginting, Elfrida
Journal of Science and Science Education Vol. 6 No. 1 (2025): April
Publisher : Pascasarjana, Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jossed.v6i1.11031

Abstract

This study aims to determine the learning of the Project Based Learning (PjBL) Model assisted by KOKAMI media (Kotak dan Kartu Misteri) on learning outcomes, learning motivation, and the significance between learning outcomes and motivation in chemical equilibrium materials at SMA Negeri 17 Medan. The sample population of all students in grade XI and as a random sample was taken from two classes, namely class XI B as an experimental class and XI C as a control class. The initial learning was carried out in the same pre-test, then learning was carried out for the control class (using the conventional model without KOKAMI media) while the experimental class (using the PjBL model with the help of KOKAMI media). The results data were analyzed using normality, homogeneity, and linearity tests. The hypothesis was tested by simple linear regression, independent t-test, and correlation test. The average pre-test score of the experimental class was 34,00  8,17 the control class was 33,14  6,57 post-test (89.71  3.60 ; 79.57 6.36), with a higher N-Gain value (0.84  0.065 ; 0.69  0.016 ). The results of the simple linear regression test showed a significance value of 0.000 ≤ (α = 0.005) with an average learning motivation of 87.25 (high category), so that Ha was accepted. The t-test shows the value of sig. 0.000 ≤ (α = 0.005), and the third hypothesis test showed sig. 0.001 ≤ (α = 0.005), indicating a significant relationship between learning outcomes and learning motivation
Co-Authors Alex Suhendra Munte Bajoka Nainggolan Boangmanalu, Srunika Dea Gracella Siagian Dewi Syafriani, Dewi Elfrida Siregar Flora Hutapea, Flora Ginting, Tasya Herlinawati Herlinawati Ida Duma Riris Jhony Hartanta Sembiring Junifa Layla Sihombing Kristian Adinata Pratama Simatupang Lisnawaty Simatupang Lisnawaty Simatupang Nora Susanti Ratu Evina Dibyantini Rikson Siburian Saragih, Hasri Tri Maya Simatupang, Lisnawaty Situmeang, Amanda Zefanya Syahputra, Ricky Andi Tampubolon, Cindy Claudin Zuhairiah Nasution, Zuhairiah