sari novieta, Sidauruk S, Meiliawati R, Sari ARP. The Difficulties of X Grade High School Students in Palangka Raya City Academic Year of 2018/2019 in Understanding Chemical Bond Concept using Two-Tier Multiple Choice . JPMIPA [Internet]. 2020 Nov. 30 [cited 2025 Mar. 9];1(2):135-48. Available from: https://e-journal.upr.ac.id/index.php/JPMIPA/article/view/3686