Research On Digital Experiment Teaching To Promote Tetra-representation

Chemistry is a natural science based on experiments.It is necessary to record experimental phenomena,describe particle changes,and use symbols to represent chemical changes.Quantitative experiments require mathematical representations such as data,data tables and curves corresponding to the chemical change process.Compared with traditional experiments,digital experiments can provide technical support for mathematical representation through sensors.Through digital experiments,not only macroscopic phenomena can be presented,but also microscopic changes that are difficult to observe in chemical changes can be demonstrated through mathematical representation.Digital experiments not only enrich the way of exploring chemical experiments,but also promote students’ Tetra-Representation.This paper intends to carry out research in the following four aspects:(1)The obstacles and causes of high school students’ Tetra-Representation of the knowledge content of ‘‘ion reaction’’.(2)The establishment of a digital experimental teaching model promoting Tetra-Representation.(3)Design of a teaching example of ‘‘ion reaction’’ based on the digital experimental teaching model to promote Tetra-Representation.(4)Research on teaching effectiveness of digital experimental teaching model.The research methods involve literature review,questionnaire survey,teaching intervention and interview research.The conclusions are as follows: Students with different academic levels have different obstacles to Tetra-Representation.All types of students’ mathematical representation is the weakest.This study establish a digital experimental teaching model to promote Tetra-Representation and takes "ion reaction" as an example to develop a series of digital innovation experiments.There is a significant difference in students’ Tetra-Representation of "ion reaction" after teaching intervention.The mathematical representation of excellent students and the overall Tetra-Representation of average students are more significant.