Efforts to Improve Student Learning Outcomes Through the Application of Problem Based Learning (PBL) Learning Model on the Subject of Chemical Bonds Class X SMAN 1 Kaledupa. Kainawa [Internet]. 2026 Feb. 8 [cited 2026 Feb. 8];7(2). Available from: https://jurnal.kainawa.id/index.php/knw/article/view/89