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All Journal Jurnal Pengajaran MIPA Jurnal Pengajaran Matematika dan Ilmu Pengetahuan Alam Jurnal Tadris Kimiya Orbital: Jurnal Pendidikan Kimia Jurnal Pendidikan Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences Jurnal Energi Baru dan Terbarukan Journal of Educational Sciences Jurnal Pengabdian Isola Jurnal Pendidikan MIPA
Tuszie Widhiyanti
Pendidikan Kimia, Fakultas Pendidikan Matematika Dan Ilmu Pengetahuan Alam, Universitas Pendidikan Bandung, Jalan Dr. Setiabudi No. 229, Bandung 40154
Religion Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Library & Information Science Mathematics Social Sciences Other

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Enhancing Molecular Geometry Understanding through 3D Visualization-Assisted Intertextual based Learning in Undergraduate Chemistry Students Ajie, Adinda Melinda Ceria; Wiji, Wiji; Mulyani, Sri; Widhiyanti, Tuszie
Jurnal Pendidikan MIPA Vol 25, No 3 (2024): Jurnal Pendidikan MIPA
Publisher : FKIP Universitas Lampung

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Abstract

Intertextuality refers to the process of understanding a context by exploring and connecting relationships between different texts or representations. In chemistry education, intertextuality serves as a communication bridge that links the three levels of chemical representation: macroscopic, submicroscopic, and symbolic. This study aims to enhance students' understanding of Molecular Geometry Concepts through Intertextual-based Learning with 3D- visualization. The research employed a quantitative approach with a one-group pretest-posttest design. Participants were selected using purposive sampling from undergraduate chemistry education students. The study involved 26 first-year students majoring in chemistry education who were taking a general chemistry course. Data were collected using student worksheets and pretest-posttest assessments. The data analysis included t-paired test for parametric statistic and evaluating student responses related to learning outcomes. Analysis of the t-paired test results shows that there is a significant difference in the pretest and posttest scores with a significance value of (p> α0.05). The most influenced concept indicator in this study was the concept of molecular geometry types with an increase of 57% in students’ correct answers.       Keywords: student’s understanding, molecular geometry, intertextual based learning, 3d visualization, undergraduate students. DOI: http://dx.doi.org/10.23960/jpmipa/v25i3.pp1468-1479
Analisis Buku Teks Kimia Dasar Berdasarkan Multiple Representasi Konsep Korosi Ovilia, Ghea; Wiji, Wiji; Mulyani, Sri; Widhiyanti, Tuszie
Jurnal Tadris Kimiya Vol 10 No 2 (2025)
Publisher : Department of Chemistry Education, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jtk.v10i2.45096

Abstract

Chemical representations and the connections among macroscopic, sub-microscopic, and symbolic levels are fundamental to meaningful chemistry learning. However, the quality and coherence of these representations in instructional materials often determine how effectively students construct conceptual understanding. This study aimed to investigate the types and interconnections of chemical representations related to corrosion presented in widely used general chemistry textbooks. A qualitative content analysis was conducted on five textbooks using an adapted framework from Gkitzia, which included the type of representation (C1), interpretation of surface features (C2), relatedness to the text (C3), caption quality (C4), and degree of correlation across multiple representations (C5). A total of 40 corrosion-related representations were identified. The analysis showed that symbolic representations were the most frequently used, although textbooks generally portrayed corrosion through macroscopic, real-world examples. Eight sets of multiple representations were found to demonstrate adequate coherence among macroscopic, sub-microscopic, and symbolic levels, effectively illustrating both the corrosion process and its prevention. Overall, the five textbooks presented the concept of corrosion with reasonable alignment across representational forms. These findings contribute to the improvement of chemistry education by informing educators and textbook authors about the strengths and limitations of current representational practices. The results also offer empirical support for implementing multiple-representation-based instruction to enhance students’ conceptual understanding and ability to visualize and interpret corrosion phenomena.
Optimasi Pemberian Nutrisi pada Media Kultur Mikroalga Chlorella vulgaris untuk Meningkatkan Kadar Lipid sebagai Bahan Baku Biodiesel Hasbi, Ramiz; Puspanitresna, Puspanitresna; Azkiya, Andi Aryanti Nurul; Sumarna, Omay; Widhiyanti, Tuszie
Jurnal Energi Baru dan Terbarukan Vol 6, No 2 (2025): Juli 2025
Publisher : Program Studi Magister Energi, Sekolah Pascasarjana, Universitas Diponegoro, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jebt.2025.27858

Abstract

Biodiesel merupakan bahan bakar alternatif yang memiliki potensi sebagai alternatif untuk menggantikan bahan bakar fosil yang tidak ramah lingkungan dan terbatas. Bahan dasar pembuatan biodiesel seringkali berasal dari minyak kelapa sawit. Hal ini, menjadi masalah karena produksi minyak skala besar dari tanaman kelapa sawit memerlukan lahan yang luas dan dapat menimbulkan kerusakan lingkungan hutan. Mikroalga Chlorella vulgaris merupakan jenis mikroalga penghasil lipid yang baik, sehingga lipid yang diperoleh dari mikroalga ini dapat menjadi alternatif sebagai bahan baku pembuatan biodiesel. Penelitian ini bertujuan untuk menemukan kondisi optimal dalam pemberian nutrisi pada media kultur mikroalga C. vulgaris untuk meningkatkan kadar lipid di dalam selnya. Variabel bebas yang diujikan pada penelitian ini, yaitu pemberian nutrisi menggunakan air cucian beras, air limbah ampas tahu, air kelapa, dan kontrol (air tawar). Hasil penelitian menunjukkan bahwa kondisi yang paling optimal adalah pada media kultur yang diberi nutrisi air kelapa dengan perolehan lipid sebesar 22,08%, sedangkan media kultur lain diperoleh lipid berkisar 1 - 3,5 %.  Hal ini disebabkan karena air kelapa kaya akan kandungan mineral kalium dan magnesium, serta karbohidrat (glukosa, fruktosa) yang berperan penting dalam pertumbuhan dan pembentukan lipid di dalam sel mikroalga. Pemberian nutrisi dengan air kelapa pada media kultur mikroalga menjadi cara yang berpotensi untuk mengembangkan produksi lipid dalam skala industri menggunakan mikroalga yang dapat menjadi bahan alternatif pembuatan biodiesel.
Co-Authors Ahmad Aminudin Ajie, Adinda Melinda Ceria Alin Mardiah Ari Widodo Ari Widodo Aziz, Hafiz Aji Azkiya, Andi Aryanti Nurul Cahyani, Popi Diana Rochintaniawati Hasbi, Ramiz Hayat Sholihin Liliasari , Munawaroh, Heli S.H Novianti Islahiah Nurazizah, Tean Oczhinvia Dwitasari Omay Sumarna Ovilia, Ghea Puspanitresna, Puspanitresna Rahayu, Iqlima Rahmat Setiadi Rahmi, Chusnur Rizal Sakina, Nifela Septian Jauhariansyah Sri Mulyani Wiji Wiji Wiji Wulandari, Sarah Ayu Yuli Rahmawati