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]. 2025 Nov. 28 [cited 2026 Apr. 11];7(2):97-106. Available from: https://jurnal.kainawa.id/index.php/knw/article/view/89