Analysis of Coherence in Middle School Students Representation of Particulate Concepts

Journal of the Korean Chemical Society

Heojeong Yoon¹  Yoonha Lee¹ 

关键词: Particles;    Ion;    Atom;    Electrolyte;    Ion precipitation reaction;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

The concepts used to explain specific phenomenon can be influenced by context or coherent regardless of context. The purpose of this study is to understand middle school students¡¯ concept of particles in particular context and to investigate the effects of context on concept of particles. A conceptual questionnaire was developed to find out how students represented particles in two contexts: solid and solution states of electrolytes, and ion precipitation reaction. The questionnaire was administered to 9th grade students after classes of ¡®electrolyte and ions¡¯ unit. The responses of students were analyzed using framework developed for categorization of students¡¯ concepts. The results are as follows: First, it was found that students used various concepts on particles when they explained solid and solution state of electrolytes, respectively. Second, we identified students¡¯ concepts of particles used to explain ion precipitation reaction. In addition, we recognized that majority of students failed to write correct chemical symbols. Third, approximately 79% of students showed coherent responses for explanation of particles in solution state of both electrolytes and ion precipitation reaction. About 57% of students had scientific concepts. Some suggestions were made based on results for acquisition of scientific concepts on particles in different contexts.

【 授权许可】

Unknown