Obidimma OA, Osuafor AM. EFFECTS OF USE OF IMPROVISED CONSUMABLE CHEMICAL SUBSTANCES IN INSTRUCTIONAL DELIVERY ON SECONDARY SCHOOL STUDENTS’ ACHIEVEMENT IN CHEMISTRY. JSTME [Internet]. 2019 Dec. 16 [cited 2024 May 4];3(1):192-207. Available from: https://journals.unizik.edu.ng/jstme/article/view/499