Study On The Cognitive Model Of Water Solution In The Review Teaching Of Salt Hydrolysis In Grade Three Of Senior High School

The core goal of the third year review class teaching is to guide students to promote the development of their systematic thinking based on the integrated knowledge structure,so as to improve their ability to comprehensively use knowledge to solve problems.Salt hydrolysis is the key and difficult point in the teaching of "aqueous solution".How to realize "learning the new by reviewing the past" in the third year review class has always been a hot topic for theoretical and practical workers.As a systematic and structured representation of things,cognitive models play an irreplaceable role in helping students establish systematic understanding and solving complex problems.Therefore,this article combines theory with practice in order to improve the efficiency of the third year review teaching and promote students' cognitive development.Based on the existing research results of the aqueous solution cognitive model and its application,and based on the theory of cognitive development and modeling teaching related theories,this paper analyzes the theoretical level of the design and implementation of the third year review teaching based on the aqueous solution cognitive model.Then,on the basis of theory,with all the students in a science class in the third year of the researcher's school as the research object,the teaching design and implementation activities of the third year salt hydrolysis review course based on the aqueous solution recognition model were carried out,and the development and changes of the students were tracked.According to the statistics of the survey and interview results,students' development and changes are manifested as: the angle of understanding salt solution has become richer,the thinking of analyzing salt solution has become more reasonable and clear,and the idea of chemical equilibrium can be used to analyze salt solution.To balance the problem,I have basically mastered the method of analyzing a complex aqueous system in which multiple interactions coexist.The construction of the water solution understanding model made the students more deeply impressed.Once again,they recalled that these few lessons were not just some boring theoretical knowledge,but the method to solve the problem.Aiming at the analysis of teaching practice and teaching effect,the effective teaching strategies that are helpful to the construction of water solution understanding model are refined.In terms of teaching design: Applying the water solution cognition model to explore the basis of students' cognition;Constructing and applying the water solution cognition model in a real situation;Designing teaching activities around the aqueous solution cognition model.In terms of teaching implementation: Guide students to use the aqueous solution recognition model to analyze problems;Use the aqueous solution recognition model to evaluate students in class.Although this study has certain limitations in the selection of samples,it also provides a reference for teachers to carry out the same type of cognitive model construction teaching,and can also provide methods and methods for salt hydrolysis teaching design based on cognitive model construction,Enriching high school chemistry teaching strategies.