On Friday, July 12, 2024, the Chemistry Education Study Program, Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta, held a guest lecture featuring Prof. Dr. Hans-Dieter Barke from Muenster University, Germany. This lecture, designed specifically for chemistry education students, focused on a highly relevant and in-depth topic: "Students' Mental Models in Chemistry Learning." Prof. Barke explained students' mental models in chemistry learning, presenting various theories and the latest research on how students develop and use these mental models in the chemistry learning process.

Prof. Barke explained that students' mental models are cognitive representations that students construct to understand and process chemical information. These models, which are often personal and can differ between individuals, influence how students understand chemical concepts, solve problems, and apply their knowledge in practical contexts. Prof. Barke outlined various approaches to evaluating and modifying these mental models, including techniques for identifying common misconceptions and strategies for correcting them.

This activity offers significant benefits for chemistry education students, as they can learn and understand the latest techniques for identifying and supporting students' mental models. This knowledge is invaluable in preparing Chemistry Education students to face challenges in the field as future educators. The interactive discussion during the Q&A session provided an opportunity for students to delve deeper and discuss practical applications of the concepts learned, as well as exchange ideas with Prof. Barke on how to implement mental model theory in everyday teaching.

The event was attended by many enthusiastic students interested in broadening their understanding of how students learn and how best to support this learning process. Prof. Barke's presence not only enriched the students' academic experience but also strengthened the position of the Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta (UNY), as an educational institution committed to providing global insights and expertise to improve the quality of education. This guest lecture also opened up opportunities for further collaboration between Universitas Negeri Yogyakarta (UNY) and experts in mental models, which is expected to foster innovation and sustainable development in the field of chemistry education.

Overall, this event not only provided valuable knowledge but also motivated and prepared Chemistry Education students to face challenges in education with a more evidence-based and research-based approach, while reinforcing Universitas Negeri Yogyakarta's commitment to providing high-quality, future-oriented education..