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http://dx.doi.org/10.5012/jkcs.2020.64.1.30

Lack of Sub-microscopic Representation Ability of 12th Grade Science Students in Various Acid and Base Problem Solving Processes  

Park, Chul-Yong (Kongju National Universtiy High School)
Won, Jeong-Ae (Daejeon Metropolitan Office of Education)
Kim, Sungki (Gwangju Science Academy for the Gifted)
Choi, Hee (Bongmyeong High School)
Paik, Seoung-Hey (Department of Chemistry Education, Korea National University of Education)
Publication Information
Journal of the Korean Chemical Society / v.64, no.1, 2020 , pp. 30-37 More about this Journal
Abstract
The purpose of this study was to identify the problems faced by students in sub-microscopic representation of acid-base reactions. Herein, we selected 30 students of 12th grade science classes, who had studied various acid-base models. In order to investigate the sub-microscopic representation ability of the students, we developed nine items related to various contexts, such as one type of solute and solvent, two types of solutes and solvent, cases with water as solvent or with nonaqueous solvents. For all items, we consistently observed lack of concept of chemical change. In context of aqueous and nonaqueous solutions, the frequency of lack of concept of chemical bonding was high if ammonia was the solute or solvent. Moreover, the frequency of lack of concept related to the degree of electrolytic dissociation was high. Therefore, chemistry teachers should understand that students' ability to sub-microscopic representation of acid-base reactions can be enhanced by analyzing the difficulties faced by the students in solving diverse acid-base problems.
Keywords
Acid-base problem solving; Sub-microscopic representation; High school students;
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