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Chemistry Education Study Program, Teacher Training, And Education, Tadulako University
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Influence Problem-Based Learning Model (PBL) on Student Learning Outcomes on Colloidal Systems Material Nurjanna Nurjanna; Sri M. Sabang; Ijirana Ijirana; Ratman Ratman
Jurnal Akademika Kimia Vol. 15 No. 1 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i1.pp46-54

Abstract

Students' chemistry learning outcomes remain relatively low, especially in the colloidal system material, which is considered difficult to understand due to a lack of active student involvement in the learning process. The Problem-Based Learning (PBL) model is an innovative approach that can improve student learning outcomes by presenting real problems that encourage students to think critically, analytically, and actively in finding solutions. This study aims to examine the effect of the PBL model on student learning outcomes in the colloidal system material for class XI at SMA Negeri 1 Palu. The type of research used is a quasi-experiment with a Nonequivalent Control Group Design. The research sample consisted of two classes: class XI-3, the control class, and XI-4, the experimental class, each with 36 students. The research instrument was a multiple-choice learning-outcome test consisting of 15 questions, validated by an expert and found to have 82% validity. Pretest and posttest data were analyzed using the SPSS program version 26.0. The t-test results showed a p-value of 0.043 < 0.05, so H0 was rejected, and H1 was accepted. Thus, it can be concluded that the application of the Problem-Based Learning (PBL) model significantly improves student learning outcomes in colloidal systems. This study provides empirical evidence that the application of PBL can increase active involvement and student learning outcomes, and can serve as a reference for teachers in developing more contextual and student-centered chemistry learning strategies.
The Effect of the PBL Model on Literacy and Numeracy Skills in Acid-Base Material Ratman Ratman; Kasmudin Mustapa; Dewi S. Ahmar; Anastasya Anastasya; Ijirana Ijirana; Magfirah Magfirah; Haeruddin Haeruddin
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp169-173

Abstract

Problem-Based Learning is a learning model that focuses primarily on problems in the learning process. It encourages students to collaborate in groups to solve problems through various activities. The purpose of this study was to determine the effect of the Problem-Based Learning (PBL) model on students' numeracy literacy skills in acid-base material. This study used a quantitative, true-experimental design. The research population consisted of 47 students. The research sample was obtained using purposive sampling, divided into an experimental class of 15 students from class XI MIA 2 and a control class of 16 students from class XI MIA 1. The research instruments included a literacy test comprising 20 multiple-choice questions and a numeracy test comprising five essay questions. Experts validated all instruments provided. Data analysis used the Mann-Whitney test. The results of the data analysis showed that the Mann-Whitney test p-value (0.000) was lower than the predetermined significance level of 0.05. Therefore, it can be concluded that the PBL learning model affects students' numeracy literacy skills.
The Effectiveness of Anti-Mosquito Aromatherapy Candles Formulated with Pine Leaf and Tuberose Flower Essential Oils Febby A. Elvita; Siti Nuryanti; Dewi S. Ahmar; Ijirana Ijirana; Purnama Ningsih
Jurnal Akademika Kimia Vol. 14 No. 4 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i4.pp242-250

Abstract

The essential oil of tuberose flowers has a distinctive aroma that mosquitoes dislike and can kill insects, and it also contains eugenol, a beneficial antioxidant. Therefore, this essential oil is utilised in aromatherapy candles. Another essential oil with a distinctive aroma is pine needle oil. Its aroma can relieve cold symptoms and also repel mosquitoes. The objective of this research is to determine the characteristics and effectiveness of essential oil extracts from pine needles (Pinus merkusii) and tuberose flowers (Polianthes tuberosa L) as anti-mosquito aromatherapy candles. The research method used is true experimental. The samples used in this study are pine leaves and tuberose flowers. Fresh pine leaves are steam-distilled, while tuberose essential oil is commercially produced. Then, an evaluation stage of the aromatherapy candle preparation is conducted. The results of the therapeutic effect test on F1 and F4 show a feeling of relaxation and freshness. The percentage of mosquito mortality in formulations F0, F1, F2, F3, and F4 were 0%, 27%, 37%, 43%, and 53% respectively. From these formulations, it can be concluded that F0, F1, F2, and F3 are not effective at killing mosquitoes, as only F4 meets the lethal concentration 50 (LC50) criteria. This shows that in the F4 formulation, the essential oil content, consisting of eugenol and α-pinene, produces the highest mosquito mortality rate, and this combination has the potential to be used as an anti-mosquito aromatherapy wax.
Co-Authors AA Sudharmawan, AA Almubarak Almubarak Anastasya Anastasya Anna Kurnia Aprilina Rizqi Auliya AR, Rommy Atiek Winarti Baharuddin Paloloang Damayanti, Alfina Detris Poba Detris Poba Dewi S. Ahmar Elyas Djufri Esterlina Marpaung, Meida Febby A. Elvita Ficiyarni Gleryl F. Novemly Haeruddin Haeruddin Hariani Hariani Hartarti Uminah Hendri Hermawan Adinugraha Hengki Abram, Paulus Hermin Ika Kartika Indra, Pande Irna Cahyani Jamaludin M Sakung Jusman Mansyur Kasmudin Mustapa Lilin Nurjanah Magfirah Magfirah Magfirah Magfirah Magfirah Magfirah, Magfirah Mailili, Wahyuni Mappiratu Mappiratu Mery Napitupulu Minarni Rama Jura Misnah Misnah Muh. Rizal Nur Intan Nurbaya Nurbaya, Nurbaya Nurfauzia Nurfauzia Nurjanna Nurjanna Nurvita Pajri, Nur Parham Saadi Paul Rumondor Prasetio, Budi Purnama Ningsih Rahayu, Melani Ramadhan , Moh. R. Ratman Ratman Ratman Ratman Reni Septiani Reski Amelia Rizall, Muhammad S. Supriadi, S. Sarintan Nurcahyati Kaharu Siti Aminah Siti Nuryanti Sitti Aminah Sitti Aminah Sitti Rahmawati Sri M. Sabang Sri Muliani Sri Mulyani Sri Mulyani Sabang Sri Poedjiastoeti Sri Wahyuni Sri Wahyuni Suherman Suherman Suherman Suherman Supriadi Supriadi Supriadi Supriadi Suyono - Syamsuriwal, Syamsuriwal Tri Santoso Tri Santoso Vivien Marvina Windia Hadi, Windia