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All Journal Hydrogen: Jurnal Kependidikan Kimia Journal of The Indonesian Society of Integrated Chemistry
Pitaloka, Dinda Ayu
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Chemical Engineering, Chemistry & Bioengineering Chemistry Education

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Learning Cycle 5E through Interactive Simulator to Improve Understanding of Molecular shapes and Chemistry Identity Pitaloka, Dinda Ayu; Muntholib, Muntholib; Dasianto, Dasianto
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 3 (2025): June 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i3.15842

Abstract

This study aims to improve students understanding of concepts and chemistry identity in molecular shape material through the application of the learning cycle 5E (LC 5E) model assisted by interactive digital simulator media. The research method used is classroom action research (CAR) with the Kemmis and Taggart model. The model has four stages, namely planning, action, observation, and reflection. The subjects in this study were 32 students from class X-3 SMA Brawijaya Smart School in the 2024/2025 academic year. The data obtained were analyzed descriptively. Based on the results of the study, it is known that in cycle I, the application of LC 5E assisted by interactive digital simulator media has not been able to improve understanding of molecular shapes and the percentage increase in students' chemistry identity is low. Therefore, improvements were made in cycle II referring to the results of the reflection, there was an increase in concept understanding from 68% to 82% with classical completeness reaching 81%. In addition, the n-gain value of 71.8% was obtained, indicating that the application of the LC 5E model assisted by interactive digital simulator media was quite effective in improving students' concept understanding on molecular shape material. There was also an increase in students' chemistry identity, especially related to the indicators of mastery experiences and verbal persuasion, 57% and 50% respectively. Thus, it can be concluded that through the application of the 5E learning cycle model assisted by interactive digital simulator media on the material of molecular shapes is effective enough to improve students' concept understanding and chemistry identity.
Trenggalek Durian Peel Ash a K2O Catalyst in Ultrasonic Biodiesel Production Pitaloka, Dinda Ayu; Santoso, Aman; Hayuningtyas, Inggar Firdaus
Journal of The Indonesian Society of Integrated Chemistry Vol. 17 No. 2 (2025): Journal of The Indonesian Society of Integrated Chemistry
Publisher : Pendidikan Kimia FKIP Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jisic.v17i2.49504

Abstract

Global population growth has driven increased demand for energy, particularly fossil fuels. A sustainable alternative to address this issue is the production of biodiesel from renewable sources, such as waste cooking oil. This study utilized a heterogeneous potassium oxide (K₂O) catalyst derived from local Trenggalek durian peel ash to enhance the efficiency of the transesterification reaction. The catalyst was synthesized via calcination at 400°C, 500°C, and 600°C for 5 hours. The transesterification reaction was carried out with a methanol-to-oil molar ratio of 12:1 and catalyst concentrations of 1%, 3%, and 5% (w/w) at 65°C. The optimum condition was achieved using durian peel ash catalyst calcined at 600°C at a concentration of 3% (w/w), yielding a biodiesel conversion of 96.24% via ultrasonic-assisted transesterification. The physicochemical characterization of the produced biodiesel showed results that met standard specifications, including analyses of yield, density, viscosity, refractive index, acid value, saponification value, and iodine value. Furthermore, FT-IR and GC-MS analyses were performed to confirm the functional groups and components of the biodiesel product, in accordance with the expected specifications.
Co-Authors Aman Santoso Dasianto, Dasianto Hayuningtyas, Inggar Firdaus Muntholib