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All Journal International Journal of Evaluation and Research in Education (IJERE) SAINSMAT Jurnal Pendidikan Ekonomi (JUPE) Jurnal Pendidikan IPA Indonesia Jurnal Inovasi Pendidikan Kimia Tadris: Jurnal keguruan dan Ilmu Tarbiyah Jurnal Inovasi Pendidikan IPA J-PEK (JURNAL PEMBELAJARAN KIMIA) JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Indonesian Journal of Chemistry Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Jambura Journal of Educational Chemistry JCER (Journal of Chemistry Education Research) Acta Chimica Asiana Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Journal of Community Practice and Social Welfare (JaCiPS) Jurnal Pijar MIPA SAINSMAT: Jurnal Ilmiah Ilmu Pengetahuan Alam PREVENIRE: Journal of Multidisciplinary Science Jurnal Pendidikan Sains Indonesia (Indonesian Journal of Science Education) Innovation for Community Service Journal Jurnal Pendidikan MIPA Maharsi : Jurnal Pendidikan Sejarah dan Sosiologi

Yahmin Yahmin

Universitas Negeri Malang

Author-ID : 3008414

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Social Sciences Other

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Pengaruh Komposisi SiO2/Al2O3 dalam Sintesis ZSM-5 (Zeolite Socony Mobile-5) Bersumber Silika Pasir Pantai Lokal Sumari Sumari; Suryani Indah Permatasari; Lailatul Ilmiyah; Fauziatul Fajaroh; Yahmin yahmin; Ida Bagus Suryadharma
JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Vol 4, No 2 (2020)
Publisher : State University of Malang or Universitas Negeri Malang (UM)

Pasir pantai di Indonesia memiliki kandungan silika yang tinggi berupa SiO2. Silika dengan kemurnian tinggi dapat digunakan sebagai bahan dasar sintesis zeolit, salah satunya adalah ZSM-5 (Zeolite Socony Mobile-5). Zeolit jenisZSM-5 (Zeolite Socony Mobile-5) dapat digunakan sebagai katalis yang memiliki keunggulan dalam struktur dan ketahanan terhadap suhu. Oleh karena itu, ZSM-5 (Zeolite Socony Mobile-5) memiliki harga yang mahal sehingga apabila dilakukan sintesis sendiri sangat menguntungkan. Tujuan penelitian yaitu mengetahui pengaruh komposisi SiO2/Al2O3 dalam sintesis ZSM-5 dari silika pasir pantai. Metode penelitian terdiri 3 tahapan: (1) pemurnian pasir pantai, (2) ekstraksi silika, dan (3) sintesis ZSM-5. Hasil yang diperoleh: (1) kemurnian silika sebesar 97,2%, (2) komposisi Si87Al9 memberikan hasil yang lebih baik dibandingkan Si89Al7 dibuktikan dengan terbentukknya 12 puncak ZSM-5 hasil uji XRD.

ANALISIS MODEL MENTAL MAHASISWA PENDIDIKAN KIMIA DALAM MEMAHAMI BERBAGAI JENIS REAKSI KIMIA Supriadi Supriadi; Suhadi Ibnu; Yahmin Yahmin
Jurnal Pijar Mipa Vol. 13 No. 1 (2018): MARET
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Tujuan dari penelitian ini adalah untuk menggali model mental mahasiswa dalam memahami berbagai jenis reaksi kimia berdasarkan perbedaan pengetahuan awal. Sampel terdiri dari 152 mahasiswa yang berasal dari semester 1,3, dan 5 Program Studi Pendidikan Kimia Universitas Mataram. Desain penelitian yang digunakan dalam penelitian ini adalah desain penelitian kualitatif deskriptif. Sebanyak 10 item soal tes essay dikembangkan tentang topik reaksi pembentukan, reaksi penguraian, reaksi pembakaran, reaksi substitusi tunggal dan reaksi substitusi ganda untuk mengidentifikasi model mental mahasiswa dan 19 soal tes pilihan ganda untuk mengidentifikasi pengetahuan awal mahasiswa. Hasil penelitian menunjukkan bahwa sebanyak 74,3 % mahasiswa masih mengembangkan model mental inisial dalam menjelaskan fenomena reaksi pada level submikroskopik dan belum ada mahasiswa yang mengembangkan model mental saintifik. Mereka hanya menjelaskan proses terjadinya reaksi kimia pada level makroskopik dan simbolik. Selain itu dalam model mental mahasiswa, masih terdapat pra konsep yang dapat menyebabkan miskonsepsi. Peneliti menyarankan bahwa perlu diterapkan pembelajaran yang berbasis multi level representasi dan perlu dikembangkan media pembelajaran yang dapat meningkatkan model mental mahasiswa karena pengembangan model mental sangat penting dalam memahami konsep-konsep kimia.

THEORETICAL STUDY ON 15-CROWN-5 COMPLEX WITH SOME METAL CATIONS Yahmin Yahmin; Harno Dwi Pranowo; Ria Armunanto
Indonesian Journal of Chemistry Vol 12, No 2 (2012)
Publisher : Universitas Gadjah Mada

The capability of 15-crown-5 ethers to form complexes with some metal cations (Li+, Na+, K+, Zn2+, Cd2+ and Hg2+) was investigated by an ab initio quantum mechanical method. The calculations were performed at the RHF/lanl2mb level of theory. The interaction energies were used to evaluate the metal binding capability of the crown ether. The effect of nature of the metal on the binding properties was also studied. The results of the calculations showed that the interaction energy of the complexes increased in proportion with the ratio of ion charge, electronegativity and ionization potential to the cation diameter. In addition, based on the extraction distribution coefficient in the gas phase, it is found that the 15-crown-5 could not extract metal cations investigated.

AB INITIO INVESTIGATION OF 12-CROWN-4 AND BENZO-12-CROWN-4 COMPLEXES WITH Li+, Na+, K+, Zn2+, Cd2+, AND Hg2+ Yahmin Yahmin; Harno Dwi Pranowo; Ria Armunanto
Indonesian Journal of Chemistry Vol 10, No 1 (2010)
Publisher : Universitas Gadjah Mada

The structure and binding energies of 12-crown-4 and benzo-12-crown-4 complexes with Li+, Na+, K+, Zn2+, Cd2+, and Hg2+were investigated with ab initio calculations using Hartree-Fock approximation and second-order perturbation theory. The basis set used in this study is lanl2mb. The structure optimization of cation-crown ether complexes was evaluated at HF/lanl2mb level of theory and interaction energy of the corresponding complexes was calculated at MP2/lanl2mb level of theory (MP2/lanl2mb//HF/lanl2mb). Interactions of the crown ethers and the cations were discussed in term of the structure parameter of crown ether. The binding energies of the complexes show that all complex formed from transition metal cations is more stable than the complexes formed from alkali metal cations.

Corrosion Inhibition Efficiency Of Nicotine Based On Quantum Chemical Study Yayuk Wirayani; Maria Ulfa; Yahmin Yahmin
Acta Chimica Asiana Vol. 1 No. 2 (2018)
Publisher : Chemistry Education Program, the University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v1i2.29

The effect of substituents, electron donor groups (NH2, OH, CH2OH and CH3) and electron withdrawal groups (NO2, COOH, and Cl), to the efficiency of corrosion inhibition of nicotine has been studied using theoretical studies. The effect of substituents toward the efficiency of corrosion inhibition of nicotine based on quantum parameters (EHOMO, ELUMO, Egap, I, Ï‡, dan Î”N). The efficiency of corrosion inhibition based on quantum parameters is NH2 > OH > CH2OH > CH3 > BN > Cl > COOH > NO2. The addition of electron donor group NH2 has the highest inhibitory efficiency of 99.79 %. In contrast, the presence of electron withdrawal group NO2 has the opposite effect.

Effectiveness of Concept Change Oriented Learning with Dual Situated Learning Model (DSLM) Assisted by Multi Representations (MRs) To Improve Understanding of Acid-Base Concepts for High School Students Urwatil Wutsqo Amry; Sri Rahayu; Yahmin
Journal of Multidisciplinary Science Vol. 4 No. 1 (2025): February
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Institut Studi Islam Sunan Doe

Research on the Effectiveness of Concept Change Oriented Learning with Dual Situated Learning Model (DSLM) Assisted by Multi Representations (MRs) to Improve Acid-Base Concept Understanding of High School Students is a quantitative study which employs a quasi-experimental design with a non-equivalent control group design pretest-posttest. The research subjects were 70 students of class XI pattern 5 SMAN 4 Malang for the academic year 2020/2021 which comprised two classes taken by cluster random sampling, one class as the control class (34 students) and one class (36 students) as the experimental class. The research data was collected using the acid-base concept understanding test instrument (TPKAB) which comprised 25 items (17 items for two-tier questions and 8 items for multiple choice). The research hypothesis was examined through the ANCOVA test assisted by the SPSS 21.0 for windows program with a significance level of = 0.05. The results demonstrated the increase in the average value of the experimental class was higher than the increase in the average score of the control class after learning acid-base material. Meanwhile, the results of the delay-test demonstrated the PK-DSLM-MRs were effective in maintaining the retention of students' conceptual understanding on acid-base material. PK-DSLM-MRs gave the strongest influence on the group concept of acid-base strength. The number of misconceptions and students who experience misconceptions in the control class is more than the number of misconceptions and students who experience misconceptions in the experimental class.

IMPACT OF EXPLICIT SCIENTIFIC INQUIRY INSTRUCTION HYBRID MODE WITH SOCIOSCIENTIFIC ISSUE CONTEXT ON STUDENTS’ CRITICAL THINKING SKILLS IN CHEMICAL KINETICS Eli Khusmawardani; Muntholib muntholib; Yahmin yahmin
JCER (Journal of Chemistry Education Research) Vol. 6 No. 2 (2022): Volume 6. No 2. December 2022
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jcer.v6n2.p131-137

This study aimed to explore whether Explicit Scientific Inquiry Instruction (ESII) Hybrid Mode in the context of Socioscientific Issues could improve the students' critical thinking skills. The research design was a one group pretest-posttest design. The research sample was 31 science eleventh graders at SMA Mojosari for the academic year 2021/2022. The data was collected using a critical thinking skills test on Chemical Kinetics which consists of 27 valid questions with a Cronbach Alpha reliability of 0.756. A paired-samples t-test showed that the Explicit Scientific Inquiry Instruction (ESII) Hybrid Mode in the Socioscientific Issues context improved students’ critical thinking skills (p = 0.00 < 0.05). The improvement was strong as its N-gain score was 0.58 (upper–medium category) and d-effect size was 1.40 (much larger than typical category). This shows that statistically ESII hybrid mode in the context of SSI can improve students' critical thinking skills. Therefore, this strategy can improve students' critical thinking skills in the instruction that allows students to interpret, analyze, explain, evaluate, and draw conclusions

Pemanfaatan Limbah Kulit Pisang Raja Nangka sebagai Capping Agent Sintesis Partikel ZnO: Variasi Pelarut Ekstraksi Nuril Mega Musfita; Fauziatul Fajaroh; Adilah Aliyatulmuna; Endang Ciptawati; Yahmin Yahmin; Nazriati Nazriati
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 19 No. 2 (2022): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v19i2.9135

Kemunculan bakteri resisten antibiotik menjadi masalah serius di seluruh dunia. Upaya penanggulangan bakteri resisten antibiotik terus dilakukan, salah satunya dengan penggunaan material berukuran nano. Zink oksida (ZnO) merupakan salah satu partikel yang telah terbukti dapat menghambat pertumbuhan bakteri gram negatif dan gram positif. Dalam mencegah terjadinya aglomerasi pada sintesis ZnO berukuran nanometer dapat ditambahkan capping agent alami berupa senyawa metabolit sekunder pada ekstrak kulit pisang raja nangka. Adapun langkah yang dilakukan adalah: 1) ekstraksi metabolit sekunder kulit pisang raja nangka, 2) uji fitokimia, 3) penentuan kadar total flavonoid dan polifenol, 4) sintesis ZnO dengan capping agent alami ekstrak kulit pisang raja nangka, 5) karakterisasi ZnO, dan 6) uji aktivitas antibakteri ZnO. Hasil analisis kualitatif melalui uji fitokimia serta analisis kuantitatif melalui penentuan kadar total polifenol dan flavonoid menunjukkan bahwa ekstrak kulit pisang raja nangka etanol (96%)-air 2:1 (v/v) memiliki kadar metabolit sekunder yang lebih tinggi dibandingkan ekstrak kulit pisang raja nangka etanol (96%)-air 1:1 (v/v). Partikel ZnO berhasil disintesis menggunakan capping agent alami ekstrak kulit pisang raja nangka. Kadar metabolit sekunder yang berbeda pada masing-masing ekstrak mempengaruhi ukuran, morfologi, dan aktivitas antibakteri ZnO hasil sintesis.

Diagnostic Test on Chemical Equilibrium Misconception: A Literature Review Rosida, Nuchrurita; Widarti, Hayuni Retno; Yahmin, Yahmin
J-PEK (Jurnal Pembelajaran Kimia) Vol 7, No 2 (2022): J-PEK (JURNAL PEMBELAJARAN KIMIA)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um026v7i22022p049

The abstract nature of chemical equilibrium learning material tend to result in misconception. The issues of misconception are identified using multi-tier diagnostic tests. This study aims to examine previous studies investigating the multi-tier diagnostic test in investigating the misconception of chemical equilibrium. We adopted a systematic literature review using the PRISMA method in analyzing 30 scientific articles discussing chemical equilibrium misconception and their analysis methods. The results of our content analysis suggest a number of multi-tier diagnostic test types that can be used to analyze the chemical equilibrium misconception, namely the two-tier, three-tier, and four-tier diagnostic tests.

Training of Development of Inquiry-Based and Project-Based Chemistry Learning Design for Chemistry & Science Teachers Sulistina, Oktavia; Widarti, Hayuni Retno; Habiddin, Habiddin; Herunata, Herunata; Yahmin, Yahmin; Hasanah, Samudra Mutiara; Zahirah, Dhea Fairuza
J-PEK (Jurnal Pembelajaran Kimia) Vol 8, No 1 (2023): J-PEK (JURNAL PEMBELAJARAN KIMIA)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um026v8i12023p43-50

Abstrak – Nowadays, the demands of curriculum are increasing in achieving better standards of learning process. The low ability of chemistry and science teachers in developing inquiry-based and project-based learning designs is a problem that must be solved. The ability of teachers in making learning designs is one of the pedagogic competencies and professional competencies that teachers must master in their professional development. So there is a need for community service or training to teachers to facilitate this. The method of implementing this community service activity includes the presentation of material on inquiry-based and project-based chemistry learning design, discussion and question and answer, and assistance to teachers in developing the learning design, until teachers are able to make inquiry-based and project-based chemistry learning tools (including lesson plans, teaching materials, and assessment instruments). The result of the training activities was an increase in the knowledge and skills of chemistry and science teachers regarding making inquiry-based and project-based learning designs. Enthusiasm and curiosity in developing knowledge about learning design make this training activity useful for participants.Keywords: Learning Design; Inquiry; Project; Teacher; Training

Co-Authors A. Cahyarini, A. Adilah Aliyatulmuna Ahmad Munjin Nasih Akmal, Bernada Uni Tatya Alsulami, Naif Mastoor Amaliah, Nor Aman Santoso Amry, Urwatil Wutsqo Ananta Ardyansyah Aninda Indriani Anisyah Dasa Astarina Ardianty, Annida Elfiana Citra Ardyansyah, Ananta Astrid Kinantya Paramita Astrid Kinantya Paramita Ciptawati, Endang Deni Ainur Rokhim DWI SURYANTO Edy, Duwi Leksono Eli Hendrik Sanjaya Eli Khusmawardani Endang Budiasih Fauziatul Fajaroh Firmasyah, Defan Habiddin Halimah Mustika Nurhayati Harno Dwi Pranowo Hasanah, Samudra Mutiara Hayuni Retno Widarti Herunata Herunata I Wayan Dasna Ida Bagus Suryadharma Imam Alfianto Indasari, Krisma Dewi Firdaus Khoirul Faqih Khusmawardani, Eli Kurnia, Eva Lailatul Ilmiyah Laili Mei Sulistiyani Maria Ulfa Mashfufatul Ilmah Meronda, Devi Apriana Mohd Shafie Rosli Muhammad Muchson Muhammad Syaiful Hadi Muntholib Munzil Nazriati Nazriati dkk. Nuril Mega Musfita Nursida Djaen Oktavia Sulistina Parlan . Permatasari, Margaretha Bhrizda Rahayu*, Sri Ratna Kumala Dewi Ratna Kumala Dewi Rena Amelia Ria Armunanto Rosida, Nuchrurita Rosli, Mohd Shafie Rosyida, Ima S. Rahayu, S. Silvia, Debora SRI RAHAYU Sri Rahayu Suhadi Ibnu Suhadi Ibnu Suharti Suharti Sumari Sumari Supriadi Supriadi Suryani Indah Permatasari Vella Aulia Illahi Yayuk Wirayani Zahirah, Dhea Fairuza

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