The effect of using the selective model in teaching chemistry on the achievement of fifth grade middle school students. cbej [Internet]. 2025 Oct. 27 [cited 2026 Jun. 4];1(وقائع المؤتمر العلمي لكلية التربية الأسا):987-1004. Available from: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/13853