High School Chemistry Experiment Research Based On Phenomenon And Process Visualization

Chemistry experiments play an important role in chemical subjects.The use of chemistry experiments can not only cultivate students'hands-on skills,but also stimulate students'innovative ideas and cultivate scientific literacy.For a long time,the focus of the reform of chemistry experiment teaching is mainly the experiment teaching system,teaching methods and content,lacking innovation.In traditional experiments,it is often difficult for students to observe the details of the experiment.Visualization techniques?mainly using smartphones combined with macro lenses?by changing the observation method,present clear chemical reaction phenomena and processes,enabling students to learn from tiny experimental details and gain real and rich perceptual experience,build a cognitive model in the context of complex chemical problems,so as to resolve learning difficulties and reduce cognitive load.This study is based on the dual coding theory and cognitive load theory,using literature research methods,experimental research methods,questionnaire survey methods and interview methods to apply experimental phenomena and processes visualization to the chemistry teaching process,and conduct survey analysis to Identify the application prospects of experimental phenomena and process visualization,and provide references for experimental classroom teaching of first-line middle school teachers.First,analyze the 18 mandatory experiments specified in the"General High School Chemistry Curriculum Standards?2017 Edition?",and take the part of the experiment with poor visibility and fast reaction rate in the textbook as the research object to"precipitate chemical experiments","Chemical properties of concentrated H₂SO₄","Chemical properties of metals"and"Reaction of sodium with water"are examples of four typical experiments,using smartphones and macro lenses to shoot reaction phenomena and processes,and then using computer video The editing software assists processing,changes the playback multiple to observe the dynamic experimental process,and makes video materials and pictures.The details of the replacement reaction between the metal elements with different activities and the metal ions were completely captured;the gradual change process of the Fe?OH?₂precipitation reaction from white to gray was completely recorded;It also reveals the different reaction phenomena and reaction rules reflected by the difference in the order and amount of addition of CuSO₄ solution and NaOH solution.Finally,through the visual experiment to study the process and phenomenon of"the reaction between sodium and water",so that students can explore in the classroom,and analyze the help of this method to stimulate students'interest in learning and improve teaching effect.The study found that using smartphones and macro lenses to photograph experimental phenomena and processes,only simple chemical equipment and a small amount of chemical drugs can be used to meet the needs of experimental teaching and help teachers control the classroom.Improve teaching efficiency.In addition,the visualization of phenomena and processes is safe and interesting.It can be used as a supplement to the subject of inquiry learning and teaching content.Its pictures and video materials can also be used as teaching materials to help some schools carry out the most basic classroom experimental teaching.Make students fully feel the scientific beauty contained in chemical experiments.This research has a certain reference value for middle schoolchemistry experiment teaching.The application and implementation of experimental phenomena and process visualization methods are of great significance to improve the students'core literacy of chemistry.