Learning Progression Research On High School Chemistry"Ion Reaction" Based On ChemQuery Evaluation System

In recent years,various countries have set off an upsurge of science curriculum reform.Among them,the idea of learning progression integrated science curriculum around "core concepts" has been widely concerned.As an important core concept in the high school chemistry curriculum,"Ion Reaction" carries important chemistry content and chemistry concepts,and occupies an important position in middle school chemistry teaching.The research takes the core concept of high school chemistry "ion reaction" as the object,and on the basis of analytical chemistry subject knowledge,chemistry values,curriculum standards,high school textbooks and existing research,disassemble the core concept of "ion reaction" into four thematic concepts of ionization,ion participation reaction,ion balance in aqueous solution and application of "ion reaction".Based on the ChemQuery evaluation system,the "ion reaction" is divided horizontally,and an progression hypothetical model of "ion reaction" learning is constructed.On the basis of the progression hypothetical model of "ion reaction" learning,an advanced measurement tool for "ion reaction" learning was developed.In order to ensure the quality of the tools,many tests and corrections were carried out,and the software of Winsteps was used for analysis,and the measurement tools with all indicators within a reasonable range were obtained,the large samples were used for measurement.The large sample measurement adopts the random sampling method,and selects students from three classes in each of the second and third grades of a high school in Jinzhou.The measurement data is based on the Rasch model theory and analyzed with the help of Winsteps software,it determine that the test tool has good performance indicators and can be compared with Rasch.The model fits well.On this basis,a detailed analysis of the students' "ion reaction" learning level was carried out,and the progression hypothesis of "ion reaction" learning was revised based on the project difficulty value analyzed by the Rasch model.Finally,according to the research,it can be concluded that the constructed "Ion Reaction" learning progression is more reasonable,the measurement tool performance index is better,students of different grades are at different advancement levels,and students of different grades have different learning levels in different sub-concepts.On this basis,some teaching suggestions are put forward from concept learning,curriculum design,teaching diagnosis,etc.,and the research deficiencies and problems that need to be further studied are analyzed,in order to provide reference for the teaching and follow-up research of frontline teachers.