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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Walisongo Journal of Chemistry
Ningtyas, Arin Ika
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Content Validity Analysis of a Virtual Reality Based Two-Tier Multiple Choice Assessment Instrument with Ethnochemistry to Early Detect Misconceptions in Reaction Rate Topics Ningtyas, Arin Ika; Yamtinah, Sri; Saputro, Sulistyo; Shidiq, Ari Syahidul; Sudarmin; Rahayu, Sri
Jurnal Penelitian Pendidikan IPA Vol 11 No 5 (2025): May
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i5.11429

Abstract

This study aimed to develop a detection instrument for reaction rate misconceptions in prospective chemistry teachers. A Two-Tier Multiple Choice (TTMC) test with ethnochemistry content and a virtual reality (VR) storyboard were designed as assessment tools. The research followed the ADDIE model within a research and development framework. Content validity was evaluated by material and media experts through a Focus Group Discussion (FGD), with 10 TTMC questions assessed for content, language, and presentation using the Aiken formula on a 1-4 rating scale. The TTMC instrument demonstrated strong content validity, with Aiken values ranging from 0.81 to 1.00. The VR storyboard also showed content validity, with Aiken values between 0.76 and 1.00, which is above the minimum acceptable limit. These results indicate that the TTMC test and VR storyboard are valid tools for detecting misconceptions in reaction rate material, offering valuable insights for chemistry education, particularly in teacher training programs.
ENHANCED BIOGAS PRODUCTION FROM RICE STRAW THROUGH NAOH PRETREATMENT AND MOLASSES CO-SUBSTRATE ADDITION Setyowati, Widiastuti Agustina Eko; Ningtyas, Arin Ika; Zai, Fila Delfia; Mulyani, Sri; VH, Elfi Susanti; Ariani, Sri Retno Dwi; Utomo, Suryadi Budi; Wathon, Muhammad Hizbul
Walisongo Journal of Chemistry Vol. 8 No. 2 (2025): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v8i2.28200

Abstract

  This study investigates the effects of rice straw pretreatment using sodium hydroxide and the addition of molasses as a co-substrate on biogas production through anaerobic fermentation. The pretreatment process involved immersing rice straw in sodium hydroxide solutions at three different concentrations for twenty-four hours, while molasses was added at varying levels to evaluate its effect on the fermentation process. Compositional changes in the lignocellulosic biomass were analyzed using the Chesson–Datta method, which revealed significant alterations in cellulose, hemicellulose, and lignin contents. The lowest sodium hydroxide concentration produced moderate delignification while retaining a relatively high cellulose content, indicating its potential as the optimal pretreatment condition. Molasses addition consistently increased biogas production as dosage levels rose, with the highest yield observed at the maximum molasses concentration. The combined application of the lowest sodium hydroxide concentration and the highest molasses level resulted in the maximum biogas yield, demonstrating improved substrate biodegradability and fermentation efficiency. These findings highlight the practical potential of integrating NaOH pretreatment with molasses co-substrate addition to enhance the conversion efficiency of lignocellulosic agricultural waste into renewable energy through anaerobic fermentation.
Co-Authors Ari Syahidul Shidiq Elfi Susanti V. H. Setyowati, Widiastuti Agustina Eko Sri Mulyani SRI RAHAYU Sri Retno Dwi Ariani Sri Yamtinah Sudarmin Sulistyo Saputro Suryadi Budi Utomo Wathon, Muhammad Hizbul Zai, Fila Delfia