The Study Of Problem-based Learning On Theory And Practice In The Teaching Of Halogen Family

Creating actual learning circumstance is one of the important contents of modern chemistry teaching design. Constructing flexible knowledge foundation and improving problem solving ability is the significant goal of the new senior high school chemistry course reform. This paper considers that problem-based learning can meet the above demand. Basing on the hypothesis, the paper makes thorough research on theories of problem-based learning and its application into chlorine gas bleach teaching practice.This paper makes theoretical research on problem-based learning, and mainly contains concept definition, basic stages, four essentials and items we should pay attention to during problem-based learning ,etc. Also this paper synthetically considers students' characteristics that the investigation results reflect, and the knowledge characteristics of senior high school chemistry elements and compounds and other factors. Then the following conclusion can be reached: the theory of problem-based learning is fit for grade one students of high school to study elements and compounds.The practical study part of this paper selects the problem scene of chlorine gas' bleaching property changing the bad cotton to sterile wet issue, the students are supposed to be honorable guests specially invited by CCTV, and their task is explaining to audience the problem about chlorine gas bleaching and the harm of inferior wet tissues.Then, students develop into independent, synergic and problem-based...