Research On The Design And Implementation Of Chemistry Classroom Teaching Cases Based On "evidence Reasoning"

In order to implement the core qualities of chemistry in the national curriculum standard(2017)in teaching,especially to cultivate students' awareness and ability of evidential reasoning,this study has actively explored and studied the design and implementation of chemistry classroom teaching cases based on evidential reasoning.In this study,by using the methods of literature research,action research,questionnaire survey and comparative analysis,and guided by constructivism and scientific epistemology,the definition of evidence,reasoning and evidential reasoning is determined.taking a four-star senior high school student at the county level in Jiangsu province as the research object,a series of cases based on " evidential reasoning" are designed.the final research results include the following aspects:First,completed a series of compulsory 1,2 parts of teaching cases,and select some cases,from the students can be based on evidence reasoning,obtain evidence,evidence collection of comprehensive,can choose the appropriate reasoning methods and reasoning level of diagnosis and evaluation,and reflect,constantly adjust the follow-up teaching,through the comparison with parallel classes,improve the students' evidence reasoning ability.Secondly,the teaching framework of element compounds based on " evidential reasoning" is constructed.Using the students' existing knowledge and experience,put forward the problem,and from the perspective of theoretical evidence through the appropriate reasoning way to put forward their own guess or prediction,and then from the experimental point of view(macro micro combination,qualitative and quantitative)design experiments to confirm or falsify the prediction,finally combined with the appropriate reasoning way to form a conclusion(knowledge,ideas,thinking).Thirdly,according to the problems in the process of evidence reasoning,some suggestions are put forward to help students improve their ability of evidence reasoning.