Elisabet, Yoahana, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Ernita, Mellya, Chemistry Education, Faculty of Teacher Training & Education, Syiah Kuala University, Banda Aceh 23111, Indonesia (Indonesia)
Evelin, Tania, Department of Chemistry, Faculty of Mathematics and Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)

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