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Class is the core concept of logic, while classification is the basis of logical reasoning activities as well as the distinction and understanding, and it is a logical method which can class a wide variety of things by grasping the essence of things or significant feature.
"Any science begins with classification or selection. In fact, science itself has the meaning of 'branch of science'. We can not deal with the whole universe at once, so we have to choose a part of it to observe and study. So is chemistry", Professor Chengyin Yang and his students who are the co-authors said.
It is a strange phenomenon that chemistry teachers in high school ask students mast the classification but few of them can elaborate importance of the method. Teachers ask students to master the method instead of results of classification. But it is far from enough. This article is different from others. From the perspective of the professional development of chemistry teachers in secondary school, it elaborates that teachers should be conscious of a comprehensive and systematic chemical classification learning, including the ontology, value and application of classification.
After learning the source of classification, and the functions of classification in chemistry, teachers can consciously penetrate classification and its thought. There are many things people can know if they read the paper, including the development of the concept of class, the forming of the concept of classification, the universal application of classification and the role of the method and its thought in chemistry.
The promotion of basic education curriculum reform makes teachers gradually focus on all aspects of the development of students including the mastery of knowledge, learning process and method and developing emotional attitudes and values. The classification method and its thought are significant in secondary school chemistry. When teachers understand the classification, they will really identify the classification from the bottom of the hearts, and penetrate classification method and its thought to students consciously. Teachers' attainment determines the key competency of students in learning chemistry, then affect their scientific literacy.
Chengyin Yang, Professor, Mainly in a research of Teacher' Education, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, China.
Xueqing Shen and Sixin Li, Master Degree Candidate, Mainly in a research of Chemistry Curriculum and Teaching Methodology, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, China.
A paper about the study appeared recently in Science Journal of Education.