The discovery process, structure and application of allotropes, oxygen and ozone, have been well summarized in this paper, especially the application of oxygen in catalytic oxidation of alcohols and ozone in catalytic oxidation of organic pollutants in water is briefly introduced. Both oxygen and ozone have in common the production of aerobic active species to speed up the reaction. At the same time, due to the different structures of the allotropes, the role of catalysts in their respective catalytic oxidation processes is different.

Hyperbolic curves of binary copolymer composition were drew by Plot function in Matlab, for the first time, using Q and e values of monomers as the intermediate variables. The underlying relationship between the second monomer and the corresponding polymer composition was revealed, and the hyperbolic curves of (F₂-f₂) and (F₁-f₁) were combined in one diagram via a simple and approachable programming method, making the copolymerization behavior of two monomers be visualized simultaneously, which will give a deeper understanding on copolymerization reaction of two monomers for learners.

There is tremendous troubles in studying the course of organic chemistry spectroscopy for students. In order to improve their enthusiasm and learning efficiency, herein, an interesting teaching activity termed as game classroom teaching by using the online learning website of organic spectrum had been introduced. The implementation of this teaching activity is divided into classroom and after-class. It mainly relies on the answer mode of iSpec website game competition, combines teachers undefined classroom teaching and students undefined autonomous learning, carries on the professor of related knowledge and skills, which would be facile to improve the learning efficiency and effect of students.

The calculation of titration error is an important content in analysis chemistry. In most textbooks, there are too multifarious calculation formulas of titration error to be grasped for students. To address the problem, we redefined titration error by using the volume ratio between titrant solution and analyte solution. Further more, general calculation formula of acid-base titration error was constructed according to proton balancing principle. It would be achievable to precisely calculate titration error in various acid-base titrations by applying the above formula.

Experimental investigation combining theoretical understanding is of great significance to the education in chemistry. In this paper, the reduction of copper oxide in hydrogen and carbon monoxide atmosphere was explored by using in-situ X-ray diffraction technique (in-situ XRD). The experimental result found that copper oxide was gradually reduced to cuprous oxide and copper in hydrogen or carbon monoxide atmosphere from 300 ℃ and these three phases existed at the same time. All the copper oxides was converted into copper until the temperature rose to 450~500 ℃. The experimental result showed that the reduction of copper oxide is not a homogeneous process by gradually reducing CuO → Cu₂O → Cu, indicating that the pure cuprous oxide phase which could be obtained theoretically was not obtained in the experiment, and the reason for which was presented. In addition, it is of great importance that advanced scientific instrument is applied to the teaching-learning activity for undergraduates.

An open ended instrumental analysis experiment studying on the interaction between small molecules and protein was introduced. Ultraviolet and visible spectrophotometry, infrared spectroscopy and molecular luminescence analysis can be involved in this experiment and expanding experiment. Students can choose proteins and small molecules according their needs and interests. This experiment can integrate scientific research hotpots into basic experimental teaching, and cultivate students’ innovative spirit and problem-solving ability.

A method is proposed to calculate the dissociation constant of the indicator without measuring the concentration of the indicator and just by measuring the absorbance of the indicator. The dissociation equilibrium constant of bromothymol blue indicator is determined to be pK_{a=7.24 by adjusting the pH value of the solution to make the indicator present different colors. The results are consistent with those of literature value pKa=7.30. Through this experiment, students can not only master the chemical dissociation equilibrium of indicators, but also better understand and grasp the working principle and operation method of ultraviolet-visible spectrophotometer. By organically combining the principles of chemical analysis with instrumental analysis, a simple and efficient method is successfully developed to determine the dissociation constant of indicator by spectrophotometry experiment. This method not only improves the students’ practical ability, but also cultivates their innovative ability and enhances their learning interest.}

The development and application of a modular self-assembly high efficiency capillary electrophoresis teaching instrument in experimental teaching are reported. We elaborated and discussed the structural design, instrument assembly and fabrication, working principle and teaching application of this teaching instrument. Compared with the commercial instrument used in the current teaching, this teaching instrument is simple, intuitive, modular, self-assembling, low-cost, and easy to promote. It can effectively link theoretical knowledge to the corresponding practical curriculum. The students can not only understand the structure and function through manual assembly, but also master the separation principle and be familiar with the operation of the instrument, which achieves the purpose of improving teaching effect and cultivating students’ comprehensive ability.

In order to solve problems existing in the teaching of physical chemistry experiments, based on Moso teach and utilizing micro-lecture resources, we carried out the teaching reform by adopting the teaching method of organic combination of flipped classroom teaching and traditional teaching. This paper analyzes the design, application and effects of physical chemistry experiment micro-lecture in detail. The teaching practice shows that the new teaching mode has motivated students’ initiative, and improves the teaching efficiency and effects.

The development process and significance to scientific and innovative activities of “thought experiment” are reviewed. The teaching strategy which combines the “thought experiment” with chemical experiment teaching is raised. Such strategy will help improve the current chemical experiment teaching process. The method that leads the students to make backward logical reasoning and analysis on the design of experiments procedure can promote the student’s innovative thinking and the ability to practice the innovation.

Inorganic and analysis chemistry experiment course is a compulsory experiment basic course for chemistry undergraduates. The course plays a key role in the training of scientific research ability and innovation ability. We explored in course content, teaching form and open teaching reformation model. Except enhancing the basic skill of students, we expect to inspire the innovation thinking and creativity of the students by adding comprehensive and designed experiments and open experimental management model.

A comprehensive research experiment involving the synthesis of a cadmium coordination polymer and its dye adsorption properties was introduced. The cadmium coordination polymer was synthesized from succinic acid, 1,4-bis (1H-imidazol-4-yl) benzene and cadmium nitrate tetrahydrate under solvothermal conditions. The structure of the coordination polymer was characterized by X-ray single crystal diffraction, X-ray powder diffraction, thermogravimetric analysis, infrared spectroscopy, and its dye adsorption properties were also studied. The experiment integrates scientific research hotspots into basic experimental teaching, which not only consolidates students’ basic theoretical knowledge and improves their experimental skills, but also broadens students’ scientific horizons, strengthens their ability to analyze and solve problems independently. It is conducive to cultivating students’ innovative spirit and practical ability.

In the university teaching of inorganic chemistry experiments, we assayed the content of calcium, iron and zinc in health medicine by the technique of element content determination. We detailed the experiment condition, assay method and calculation process. Here, we emphatically discussed separation and purification method for the testing sample and effective masking method for interfering elements. By comparing the experimental results with the content data in the product description, it shows that the experimental method has satisfactory accuracy and operability.

This study collects texts, videos and other materials from three chemistry full-time education masters in the middle school practice process, using qualitative methods such as case studies, text analysis, classroom observations. The chemistry classroom teaching system construction model is used to analyze and compare the intervention of the multi-member professional learning community and the classroom teaching of the full-time education master in the practice process.The results show that the teaching of the full-time education master has significant changes under the intervention of the professional learning community.Eachteaching element in theconstructionmodelhas been improved to varying degrees. Different members in PLC have different intervention content, effect and influence degree on the development of full-time education master’s teaching. On this basis, a teaching change model is established. The multi-member professional learning community can promote the development of the full-time education master and provide a referencepractice intervention paradigm for the reform of the master.

Experimental teaching ability is an important sign of professional development of chemistry teachers. The course, middle school chemical experiment teaching skill training is a required comprehensive experimental teachings training course forpre-service tearchersmajoring in chemistry, which plays an important role in the training ofpre-service tearchers’ experiment teaching skill majoring in chemistry. This study investigates and analyzes the overall evaluation, study attitude, teaching and evaluation methods, learning difficulties and other aspects of the course. In view of the problems, the paper puts forward teaching suggestions such as coordinating course setting, defining course value, establishing learning community and enhancing experimental thinking training.

This study analyzed and contrasted the curriculum standards of the Science in primary school with the requirements of the chemical knowledge content in the syllabus of Science·Chemistry in the five-year specialty primary education major, as well as the chemical knowledge content sought in the teaching materials of Science and Science·Chemistry. At the same time, this study discussed several problems existing in the chemistry course of primary education at the five-year specialty level and put forward several suggestions such as selecting the appropriate course teaching content, strengthening the construction of chemistry experiment and chemistry teaching material, establishing a new module of theoretical course and a new system of experimental teaching for chemical course construction.

Focusing on the connotative teaching of physical chemistry under the professional background, a series of representative and typical cases are selected in the field of disaster prevention and mitigation, which are based on the training program of groundwater science and engineering, literature research and interviews with relevant full-time teachers and students. And in this way, the organic integrations of physical chemistry with the general courses of disaster prevention and mitigation, and professional core courses are constructed. The attraction and appeal of physical chemistry will be better enhanced, and further, it can promote professional teaching and improve students’ professional accomplishment.

The semi-flexible docking was performed for protein receptors and ligands by using AutoDock software, and its application in classroom teaching of biochemistry was discussed. It is helpful for the students’ understanding about the interactions between protein receptors and ligands, and inspire their interests and motivation in learning biochemistry, and for the improvement of teaching quality.

Aiming at academic discredit of postgraduates, the study investigated 10 chemistry research groups in 6 first-class universities and elucidated specific phenomena and reasons of academic discredit, as well as effective measures to establish academic credit by using open interviews, participatory observation and field notes of qualitative approach. The reasons for the academic discredit are found to include unhealthy social influence, the pressure and stimulus of the university regulations, limited management of supervisors and the postgraduates themselves.However, the supervisors have taken repeating validation, using original data as supporting information and co-completing experiment to solve academic discredit. The study shows that despite the chance of academic discredit, the adoption of certain measures can prevent academic discredit and establish credit.

In the present paper, the authors tried to discuss the conditions that metallochromic indicator should meet and the application of indirect metallochromic indicator based on an example of analytical chemistry. Furthermore, the authors tried to analyze a few problems which needed to pay attention and the relative solutions in back titration combined with practical examples. The purpose was to help students to understand the essence of the example, to enlighten divergent thinking, to draw inferences about other cases from one instance, and to improve learning efficiency and scientific thinking ability.

The cultivation of college students’ innovative and practical ability is an important proposition in current university education. As an applied undergraduate college, Lvliang Universityexplored the new mode of student training and firstly carried out work in the department of chemistry and chemical engineering, including the reform of personnel training program, the expansion of laboratory opening, the selection and cultivation of “scientific research assistants”. As a result, the implementation of the project has led to many changes and produced a number of scientific research and competition results, which provides valuable experience for the comprehensive development of scientific research training for students throughout the school.

Taking the articles published in the column of “Problem Discussions and Reflections” in Chinese Journal of Chemistry Education from 2009 to 2018 as the research object, this paper makes a statistical analysis from the four aspects of the number, content, author and citation of the articles by combining the method of systematically consulting the annual general catalogue with reading the original documents. It is found that the number of papers published in the column of “Problem Discussions and Reflections” in Chinese Journal of Chemistry Educationis 33 per year; the research contents involves chemical knowledge discussion, teaching discussion, experiment exploration, textbook discussion, exercise discussion, etc.; the distribution of the author’s area and organization is unbalanced; the research methods are mainly speculation and chemical experiment; the cooperation between the authors is the trend; the number of citations is gradually increasing.