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All Journal Jurnal Pendidikan Matematika dan IPA Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) Chemistry in Education Lantanida Journal Jurnal Pendidikan Kimia (JPKim) Indonesian Journal of Chemical Science and Technology CHEDS: Journal of Chemistry, Education, and Science Jurnal Ilmu Pendidikan Indonesia Journal of Learning Improvement and Lesson Study LAVOISIER: Chemistry Education Journal Jurnal Indonesia Sosial Sains Indonesian Journal of Advanced Research (IJAR) Jurnal Inovasi Pendidikan Sains dan Terapan Journal of The Indonesian Society of Integrated Chemistry LAVOISIER: Chemistry Education Journal Jurnal Ilmiah Bongaya (JIB)
Nurfajriani, Nurfajriani
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Analysis of Teacher Needs for the Development of Higher Order Thinking Skill (HOTS) Based Class X High School Chemistry Material Assessment Instruments Saputra, Oddy Azis; Nurfajriani, Nurfajriani; Sudrajat, Ajat
Jurnal Pendidikan dan Pembelajaran Kimia Vol 13, No 1 (2024): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Universitas Lampung

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

Abstract

This research aims to describe teachers' needs for HOTS-based assessment instruments that can be used in evaluating student learning outcomes in class X SMA. Needs analysis is carried out based on the first stage of the ADDIE model, namely (Analyst). The methods used in this research are survey and interview methods. The participants in this research were 5 chemistry teachers from 5 schools in Medan City. Data collection was carried out using a questionnaire with qualitative data type. The research results were analyzed descriptively and obtained data that the assessment instruments often used by teachers were still at the C1 - C3 cognitive level with a percentage of 90%, while HOTS-based chemistry learning assessment instruments with C4 - C6 cognitive levels were still very rarely used. The obstacle is that the creation, use and development of instruments are relatively difficult, so teachers feel less interested in creating HOTS-based assessment instruments and lack ideas or references for what assessment instruments are good for evaluating chemistry learning. So it has an impact on the level of critical and creative thinking abilities of students.Keywords: instrument, assesment, HOTSDOI: 10.23960/jppk.v13.i1.2024.14
PENGARUH PERBEDAAN METODE MELT PROCESSING DAN SISTEM LARUT TERHADAP HASIL GRAFT KOPOLIMERISASI CYCLIC NATURAL RUBBER (CNR) DENGAN GLYCIDYL METHACRYLATE (GMA) Eddiyanto, Eddiyanto; Sipahutar, Rezwan Mulya; Nurfajriani, Nurfajriani; Pulungan, Ahmad Nasir; Herlinawtati, Herlinawati
Lantanida Journal Vol 12 No 2 (2024)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v12i2.26272

Abstract

Although natural rubber has many good qualities, its commercial uses are limited by its low chemical reactivity and low heat stability. A derivative with better stability, Cyclic Natural Rubber (CNR), has to be chemically modified to increase its usefulness and broaden its range of applications. Investigating the effects of two different methods, the melt processing and solution system on the FTIR spectra of Cyclic Natural Rubber (CNR) graft copolymerization with Glycidyl Methacrylate (GMA) was the aim of this work. Additionally, an evaluation of the effect of Dicumyl Peroxide (DCP) and Benzoyl Peroxide (BPO) initiators on grafting results was carried out. According to FTIR spectrum analysis, the carbonyl ester (C=O) peak at roughly 1721 cm⁻¹, indicating effective grafting, was more pronounced in the melt processing approach than in the solution procedure. This implied that melt processing resulted in higher grafting efficiency. The absorption bands in the C-H stretching region (2860-2921 cm⁻¹) and the C=C stretching area (1672 cm⁻¹) show that the underlying structure of CNR has not degraded. The carbonyl index values for each composition showed that BPO performed better than DCP in the melt treatment method, however DCP as an initiator in the solution system produced a higher grafting efficiency than BPO.
Effect of Chain Length on Fatty Alcohol Sulfation using SO3-DMF Sitinjak, Elvri Melliaty; Masmur, Indra; Tarigan, Dedi; Anggini, Cindy; Simbolon, Emma Juli Anamasta; Simatupang, Endang; Pane, Yulia Ratu; Simorangkir, Murniaty; Nurfajriani, Nurfajriani
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.v6i2.49376

Abstract

The fatty alcohols C8, C10, C16 and C18 were used as raw materials for the sulfation reaction using the SO3-DMF complex to study the ratio of carbon chains. The first step is to prepare the SO3-DMF complex, by reacting SO3 gas into DMF at a temperature of 0-4 0C with a reaction time of 3 hours, then sulfation is carried out at 100 0C for 5 hours on C8, C10, C16 and C18. Tests were carried out on the results of sulfation with an FT-IR Spectrophotometer. Surface tension, foam stability and yield calculations. From the sulfation results, the yield results were respectively 83%, 81%, 68% and 61% then the results from the surface tension analysis were 35.3, dyne/cm, 30.3 dyne/cm, 29.4 dyne/cm and 33.6 dyne/cm and foam stability analysis of 0.2 cm, 0.8 cm, 0.7 cm and 1 cm. Based on the surface tension reduction value, palmityl alcohol is the best raw material for making surfactants.
Synthesis of Sodium Myristyl Sulfate with Myristyl Alcohol Sulfation using SO3-DMF Sitinjak, Elvri Melliaty; Masmur, Indra; Tarigan, Dedi; Anggini, Cindy; Simbolon, Emma Juli Anamasta; Simatupang, Endang; Pane, Yulia Ratu; Simorangkir, Murniaty; Nurfajriani, Nurfajriani
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.v6i2.49378

Abstract

The sulfation reaction between myristyl alcohol and the SO3-DMF complex has been successfully carried out to produce sodium myristyl sulfate. Formation of the SO3-DMF complex by reacting DMF and SO3 gas obtained from the reaction of phosphorus pentaoxide and H2SO4. The variables studied were the time of formation of the complex, the time and temperature of sulfation and the concentration of NaOH at neutralization. The results of myristyl alcohol sulfation with SO3-DMF were tested by FTIR spectroscopic analysis, surface tension test, and foam stability test. The formation time of the SO3- DMF complex of 5 hours is the result of the highest surface tension reduction and the most optimal foam stability. The results of the foam stability test analysis showed the highest value at 80oC with a foam stability of 0.5 cm. The best result of sulfation neutralized with 40% NaOH solution was able to reduce the surface tension value and has foam stability up to 66% with a decrease in foam height of 0.3 cm
Pengembangan Media E-Learning Berbasis Weblog dengan Pendekatan Contextual Teaching and Learning (CTL) pada Materi Laju Reaksi Rumahorbo, Shinta; Nurfajriani, Nurfajriani
Jurnal Indonesia Sosial Sains Vol. 3 No. 04 (2022): Jurnal Indonesia Sosial Sains
Publisher : CV. Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jiss.v3i04.566

Abstract

This study aims to find out the analysis of media needs, look for e-learning media based on weblogs with a CTL approach on reaction rates developed based on BSNP and knowing students' responses to webblog-based e-learning media with a CTL approach on the reaction rate material. Analysis of media needs was carried out by interviewing the chemistry class teacher of SMAN 1 Sibolga. This study uses the method (R&D) with the ADDIE development model covering the stages (analysis, design, development, implementation and evaluation). The developed media product was validated by 3 expert validators consisting of 2 chemistry lecturers and 1 chemistry teacher. The average result of the validation of the weblog-based e-learning media with the CTL approach that has been developed by chemistry lecturers and teachers is 3.70 in the very feasible category and material validation is 3.71 in the very feasible category and does not need to be revised. The assessment of the percentage of student responses to the web-based e-learning media developed was 74.5% with high response criteria
Co-Authors Ahmad Nasir Pulungan Ajat Sudrajat Anggini, Cindy Asep Wahyu Nugraha Bajoka Nainggolan Bustam, Bustam Eddiyanto Eddiyanto Farhansyah, Muhammad Gustiana, Rara Haloho, Theo Jan Fery Herlinawtati, Herlinawati Indra Masmur Izmalinda, Izmalinda Khairunisa, Dira Manurung, MS Murniaty Simorangkir Nainggolan4, Bajoka Napitupulu, Rahel Ronauli Kurniaasih Pakpahan, Debora Pane, Yulia Ratu Rahayu Rahayu Ramlan Silaban Retno, Tri Rumahorbo, Shinta Rumahorbo, Shinta Mardiana S Siswanto Saputra, Oddy Azis Sari, Leny Nopvila Simatupang, Endang Simatupang, Lisnawaty Simbolon, Emma Juli Anamasta Sipahutar, Rezwan Mulya Sitinjak, Elvri Melliaty Syamsu, Nur Tarigan, Dedi Yudha, Sandy