The Diagnostic Study Of “Chemical Equation Writing” Based On SLOA System

Based on the self-directed learning oriented assessment(SLOA)system,the cognitive attributes of “chemical equation writing” were constructed,and the diagnostic tool of “chemical equation writing” was designed.With 205 Eighth grade’s students were diagnosed as participants,the analysis method combining quantitative and qualitative was adopted.In the process of data’s analysis,assess the learning outcomes of overall participants firstly,and then diagnose several specific student cases.Specifically,use the Rasch model and Winsteps software to output “Wright Map of Items and Persons” to obtain the overall learning outcomes of “chemical equation writing”;combine with the completion of the question-solving ideas,the learning summary and self-assessment in “My Learning Diary” and interview results to further analyze the learning status and self-evaluation of the overall participants.Choosing several participants as cases to analyze,combined with the contents of the “Person-Kid-Map” from the Rasch model and “My Learning Diary” for comprehensive analysis to determine the “recent development area” of the students,find the crux of the participants and analyze their self-assessment and self-learning.The overall diagnosis result is that the average ability of the sample to write the chemical equation belongs to the upper-middle level,and there is room for improvement in each cognitive attribute.In particular,it is necessary to emphasize the correct judgment of the reactants and products,the reaction conditions,and the states of substances.The diagnosis results of different students are quite different,and the learning characteristics and self-assessment are also different,but the diagnosis of students belonging to the same ability level has similarities.