AL-HADABI, Abdulsalam Sulaiman Dawood. Understanding Acid and Base Concepts among Chemistry and Biology Pre-service Teachers at Faculty of Education in Amran University–Yemen. Arab Journal for Sciences and Research Publishing, New Mexico, United States, v. 2, n. 6, p. 233, 2016. DOI: 10.26389/AJSRP.H13616. Disponível em: https://ajsrp.ojsexpert.com/index.php/ajsrp/article/view/1789. Acesso em: 20 dec. 2025.