Study On Adding Quantitative Experiments In The Chemistry Teaching Of Middle Schools

The new chemistry curriculum standard in the compulsory education stage of our country is that,the concept from qualitative chemistry to quantitative chemistry reflects the trend of the development of chemistry.The microscopic study of material composition and quantitative research makes chemistry rapidly developing into a natural science in the two aspects of experiment and theory.It is obvious that the quantitative chemistry is paid high attention in the new national curriculum standard.Quantitative experiment is an important part in chemistry teaching of middle school,and it is an important means to improve students' quantitative consciousness.The research of this paper includes three parts,and the main content is as follows.The first part introduces the research background,research significance and research methods.The first part emphasizes the importance of the quantitative chemistry experiment in middle school,and points out the phenomenon of ignoring quantitative experiments which exists in the classroom teaching of chemistry in middle school.The second part is the comparative analysis of the chemistry of Chinese version and Japanese version from the perspective of chemical quantitative experiment.It is concluded that there are a little of quantitative experiments in the chemistry of Chinese version,themes are insufficient.The Chinese version is lack of the quantitative experiment with respect to chemical changes and batteries.Meanwhile,the shortage of quantitative experiments of our country is pointed out from the perspective of quantity of chemical medicine.The third part is the example of the reaction of metal and acid.The qualitative and quantitative chemical experiments in classroom are investigated.Quantitative chemical experiments can improve students' consciousness of quantitative experiments.Then a new quantitative chemical experiment is developed in the second experiment.The chemical experiment is carried out in the ninth grade in Fuhe branch of Chengdu railway middle school.Adding quantitative experiments in the chemistry classroom teaching of middle school can improve the students' ability of data processing and the quantitative consciousness.The portable TDS water quality detection pen is used in the quantitative experiment.The forms and graphics are obtained after data processing.The conclusion can be applied to distinguish hard water and soft water.The third experiment will combine hand-held technology with absorption reaction of carbon dioxide,showing changes in gas pressure within the reaction flask fast and accurately,and the curves in the experiment were compared and analyzed,combined the hand-held technology with senior high school entrance examination.The significance of quantitative experiments is highlighted in solving practical chemistry problems.