Research On The Core Concept Of The Material Structure And Its Learning Progressions

Evidence-driven paradigm of educational research is the research hotspot of Western science education in recent ten years. Learning Progressions (LPs) is an important achievement in the context of this research. LPs describe the thinking processes of gradual deepening and complex on a core scientific concept in a longer period of time. Level of understanding of the thinking process presented in different grade provide important "evidence" for the curriculum, teaching, evaluation and many other aspects of the study. Therefore, based on the domestic middle school chemistry course carries on localization study of this exotic theory, not only enrich the research production of the domestic basic chemistry education, but also provide evidence for the forthcoming revision of curriculum standards and textbooks, and the reform of college entrance examination.Based on the above understanding, this study takes an important part of middle school chemistry—Material Structure as the research object, studied the following questions:(1) What are the core concepts of Material Structure? How to express these core concepts?(2) What are the level and degree of understanding these core concepts in different periods?In order to solve these problems, this study is divided into two parts. The first part, through literature analysis and text analysis defines the core concepts of Material Structure, and then according to the teaching requirements of curriculum standards and textbook, assuming the LPs framework of these core concepts. The second part, according to the hypothesis framework of LPs designs the corresponding evaluation questions, and then adjusts the hypothesis framework based on evaluation results, and constructs the LPs conforming to the actual level of the students.Through the above research, the author draws the following conclusions:(1) Define the core concepts of Material Structure and its expression.1) Particles:Matter is composed of particles;2) Force:There is a certain "force" between the particles of matter;3) Space layout: Particles of matter exist in a certain space layout.(2) Construct the Learning Progressions of above three core concepts.1) Learning Progression for the Particles:Level 1:Describe the particle property of matter, recognize, and distinguish the fundamental particles of matter.Level 2: According to the composition of the particles, judge and explain the properties and changes of particles.Level 3: Have the microcosmic structure consciousness with multiple levels, and through it to judge and explain the structure and changes of material.Level 4: Integrated use of force, space layout and other knowledge associated with particles to solve complex chemical problems.2) Learning Progression for the Force:Level 1: Know there is some kind of interaction "force" between particles of matter.Level 2: Use the nuclear force and chemical bond to explain some fact about the structure and properties of matter.Level 3: Use various types of force to explain, predict and judge the properties and changes of matter.Level 4: Fusion use hierarchical force theory to solve the comprehensive chemical problem.3) Learning Progression for the Space Layout:Level 1: According to the macroscopic phenomena formed a certain understanding of the spatial distribution of particles of the substance.Level 2: Brief describes some spatial layout of particles and its effect on the properties and changes of matter.Level 3: Base on the multiple spatial perspectives understands spatial structure of the particles, and its relationship with the material properties and changes.Level 4: Form a comprehensive spatial understanding of the material microstructure and use it to solve related problems.