Research On The Application Of Smartphone Light Sensing In The Improvement Of Chemical Experiments In Middle Schools

Chemical experiment is an important method for research and learning of matter and its changes,the formation and development of chemistry is inseparable from experiment,so through chemical experiments,students can improve their interest in chemistry,better understand and master chemical knowledge,inspire students’scientific thinking,and promote the comprehensive development of students’core literacy in chemistry is of great significance.Although China has vigorously promoted the reform of the chemistry curriculum in recent years,focusing on the function of experimental education,and raising the important role of experiments in cultivating students’core literacy to an unprecedented height,for remote mountainous areas or backward townships,middle school chemistry experiments still cannot operate normally for various reasons.With the continuous development of science and technology and the globalization of information networks,smart phones have gradually occupied a pivotal position in people’s lives,even for eighty-year-old people,down to a few years old,have been popularized.The development of mobile phone applications has made smart phones more powerful,on this basis,smart phones are applied to chemical experiments,and the three experiments are improved through smart phone light sensing and the principle of three primary colors combined with the free App"color picking".The method is simple to operate,easy to carry,low cost,obvious effect,and its application to the practical teaching of middle school chemistry can well stimulate students’learning motivation and cultivate students’sense of innovation and scientific literacy.The specific contents are as follows:Part I:Introduction.Clarify the background of the thesis proposal,understand the current situation at home and abroad,and put forward the ideas,purpose and significance of thesis writing,as well as research methods.Part II:Conceptual Definition and Theoretical Basis.The working principle and characteristics of this paper are proposed,and the design principles based on RGB principles in the design of chemical experiments are proposed based on the theory of developmental teaching and constructivism.Part III:Case study on three chemical experiments based on smartphone light sensing:（1）Research on the improvement of a wide range of p H test strips based on the principle of RGB.Using the principle of RGB,through smart phone light sensing combined with smart phone free App"color",the problems of a wide range of p H test strips were improved,and a new method for semi-quantitative determination of p H value of solution using smart phones was established.（2）The influence of concentration on chemical equilibrium was explored based on smartphone light sensing.Using smart phone light sensing combined with the principle of three primary colors,the second section of Chapter 2"The Effect of Concentration on Chemical Equilibrium"of the New Edition High School Chemistry Elective 1"Principles of Chemical Reactions"is improved and studied,and the experimental phenomenon is digitized to replace the interference caused by the traditional naked eye observation of experimental phenomena,increase the accuracy and reliability of data,deepen students’understanding of the concept of chemical equilibrium,and reduce the difficulty of students learning chemical equilibrium.（3）Smartphone light sensing to explore the influence of temperature on chemical equilibrium.Taking the phenomenon that the color of Cu Cl₂ solution changes at different temperatures,the experiment is improved by using smart phone light sensing combined with the principle of three primary colors,from qualitative theoretical learning to quantitative data analysis,and understanding the concept of the influence of temperature on chemical equilibrium from multiple angles.Part 4:In the schools where the author has taught and practiced,the two improved experimental cases were taught in practice,interviews with teachers and questionnaires were conducted with students,and the results were analyzed.Part 5:Summarize the results of the paper,clarify the problems existing in the paper,and look forward to the experimental methods in the paper.