A Practical Study Of Using Experiments To Promote High School Students' Understanding Of Chemical Concepts

Chemistry is a natural science based on experiment.The importance of experiment to chemistry is mainly reflected in its foundation and irreplaceability.The concept of chemistry is an important part of the theoretical knowledge of chemistry,and the chemical concept related to "electrolyte solution" is one of the core concepts of high school chemistry,which occupies a very important position in the subject knowledge of chemistry.Therefore,this paper takes the concept of "electrolyte solution" as the starting point of the research,designs experimental cases related to the concept of "electrolyte solution",carries out teaching practice of relevant experimental cases,and explores whether teaching with experiments can promote students’ understanding of chemical concepts.Thesis firstly analyzed combing with the domestic and foreign chemical experiment,chemistry concept,the related concept of "electrolyte solution" of the status and functions of chemical experiment,and on this basis,elaborated the research: the theoretical basis of the schema theory,cognitive load theory,dual coding theory,do to relevant concepts defined,is put forward to promote the students understand the concept of chemical experiment design principle: objective principle,the principle of connecting principle,scientific principle and visualization.Select the related concept of "electrolyte solution" as the main line,design the four concepts(electrolyte,ionic reaction,strong or weak electrolyte and salt hydrolysis)under a total of nine experiment case(the essence of the ionization of electrolyte,ionic reaction,part of the ionization of weak electrolyte,as well as application of salt hydrolysis),and conducted the related experiment teaching practice research,through questionnaire investigation and interview method to effect a certain analysis and conclusion.The results show that the designed experimental cases related to "electrolyte solution" can promote students’ conceptual understanding.The use of experiments can promote students’ understanding of chemical concepts;The experiment combining information technology with subject teaching can improve students’ learning enthusiasm.