The Research Of First Round Review Teaching Strategy About Chemical Reaction Principle In Senior Three

The principle of chemical reaction is the general law of chemical reaction which is summarized on the basis of studying the essence of a large number of chemical reactions.Through studying the module of chemical reaction principle,students can understand the laws followed by chemical changes,and can deeply comprehend the internal relationship between the essence and phenomena of chemical changes,and finally can use these chemical reaction principles to reasonably explain the relevant chemical phenomena in production,life and nature.Furthermore,the chemical reaction principles belong to the indispensable content of the college entrance examination,in which they are investigated in the multiple choice questions and fill-in-the-blank tests.During the third-year study in senior high school,most middle schools in China will organize three rounds of review by teachers.Among them,the time of the first round review takes up more than half of the general review time,indicating it is the most critical part.Therefore,the reviewing strategy of the chemical reaction principles in the first round review is a subject worthy of study.In this study,the questions related to "principles of chemical reaction" in the chemistry part of the National Comprehensive Competence Test for Science Subjects(Volumes I,II and III)of the 2017-2019 college entrance examination are taken as the research objects.Based on the “Ordinary High School Chemistry Curriculum Standards(2017 Edition)” and the “National Unified Examination Outline for General Colleges and Universities”,this paper made a statistical analysis of the number of questions and the proportion of scores,the content of the examination,the situation of the examination and the presentation of information,and the level of core literacy from the two parts of the choice questions and the blank-filling questions.By using the method of questionnaire,a questionnaire was designed to investigate the learning situation of chemical reaction principles in the first round review.Finally,according to the conclusion of test analysis and questionnaire survey,combined with Information Processing Theory,Cognitive Structure Learning Theory and Mufti-Representation Theory,the teaching strategy of the chemical reaction principles in the first round review is put forward and applied to instructional design.The results of the paper analysis show that: based on the real situation and abundant information presentation,the questions about chemical reaction principle focuses on the ability of examinees to understand,analyze and synthesize the information in the stem,figure and table in combination with essential knowledge,so as to solve chemical problems;the test questions focus on the concept of change and the idea of balance,reflecting the consistency with the concepts of balance,energy and conservation contained in the chemical reaction principle.The results show that :students are not active in first round review;after the first round review,they can't form knowledge network well;their problem-solving ability is not good because of the unreasonable cognitive structure.Therefore,this paper puts forward three teaching strategies: grasp the core concepts,improve the knowledge structure;select typical examples to explain,so as to optimize the cognitive structure;pay attention to mufti-representation,and develop core literacy.Finally,these teaching strategies are applied to instructional design.