A Hands-on Experiment of Caffeine Extraction from Tea Leaves Using Direct Sublimation: Learning Effectiveness for Secondary School Students - Horimatsu, Seika; Mizutani, Masanori; Miura, Hiroya; Ohkoshi, Emika (Journal of chemical education, 2025)
Keywords: Caffeine; Chemistry; Crystals; Effectiveness; Experiments; Extraction processes; Feedback; Hands on Science; Instructional Effectiveness; Learner Engagement; Learning; Motivation; Reagents; Science Instruction; Secondary school students; Student Evaluation; Student Motivation; Students; Sublimation; Teaching methods; Text analysis; Medicinal Chemistry; Middle School Science; Natural Products; Laboratory Instruction; Manipulatives; Elementary; Hands-On Learning; Physical Properties