As one of five basic tastes, umami plays an important role in diet culture. This article summarizes the concept and physiological formation of umami, kinds and structures of representative umami compounds, and mechanism of umami taste perception. Notably, from the chemistry perspective, the chemical compositions, structures and structure-activity relationships of umami substances are mainly discussed.

Sodium-organic battery is a new type of secondary battery using organic compounds as the electrode materials. However, organics used in sodium ion batteries also encounter some issues, such as low redox potential, high solubility in the electrolyte, and low conductivity. In response, altering the aromatic system/attaching electron-withdrawing groups could enhance the redox potential, constructing polymers could reduce solubility, and incorporating a conductive matrix could increase the conductivity. This paper focuses on carbonyl compounds as the electrode materials for sodium ion batteries and introduces the application of the carbonyl compounds/polymers, the complexes formed with conductive substrates and flexible electrodes in sodium ion batteries.

This article takes the chemistry and society course set up by the College of Chemistry of Jilin University as an example to introduce the original intention and purpose of the course, combines with the research results of the course, explores the cultivation path of the course of introduction to discipline deeply. We should adhere to content as king, tap educational resources, innovate teaching methods, and integrate ideological and political work into all aspects of subject introduction course together to help the comprehensive reform of three-wide education.

Under the requirement of cultivating innovative talents in higher education, the lecture-styled, flipped and bipartite classroom teaching modes were practiced and explored in physical chemistry curriculum, combined with the advanced techniques and methods for domestic and foreign education. The results of teaching effectiveness showed that the open teaching mode is more favorable to improve the quality of curriculum teaching and the bipartite teaching mode is more suitable for our students to learn physical chemistry, comparing with the traditional teaching.

According to the training programs and targets of application-oriented talents in our school, the course reform of physical chemistry is implemented in order to enhance the ability of students who can master and apply knowledge with ease. Based on the traditional teaching method, the two novel modes, the flipped learning and the case-based teaching, are both introduced to stimulate the students’ enthusiasm and creation when they study physical chemistry. The elaborate operating process is set forth via listing the colligative property of dilute solution as the typical example, contributing toilluminatethe application of flipped learning and case-based teaching in the physical chemistry course. Students are absolutely immerged and indulged in physical chemistry, so that the approving educational quality could be reached through the interaction between teachers and students.

In the teaching of Analytical Chemistry, in order to achieve the goal of education, the ideological and political elements are fully explored and combined with the teaching content. By introducing the method of mind mapping, a bridge between ideological and political elements and teaching content would be built, by which students can not only grasp the whole knowledge quickly, but also improve their ideological moral qualities. This paper evaluates the teaching effects and finds the existing problems by analyzing students’ performance, which can provide certain reference points for the organic combination of ideological and political education and undergraduate chemistry teaching.

By combing the project design concept, project hierarchy, project structure, design content, evaluation method and practice effect of chemical engineering principles, this paper expounds the specific methods of teaching reform and innovation of chemical engineering principles project design with the goal of training high-quality talents with engineering practice ability and innovation ability under the guidance of engineering project design. Based on the OBE concept and CDIO curriculum system construction, the practical teaching curriculum reform, which emphasizes the cultivation of talent characteristics and the optimization of curriculum structure, has deepened the understanding of the project design of chemical engineering principles.

A novel electrochromic (EC) compound of N,N-di(4-methoxyphenyl)-2-amino-9,9-dimethylfluorene was synthesized by using triphenylamine derivative as a precursor via Ullman reaction. The structure and electrochemical properties of the compound were characterized by infrared spectroscopy, nuclear magnetic resonance spectroscopy, and cyclic voltammetry. The EC performance of the compound was deeply investigated by spectroelectrochemistry with combining an electrochemical workstation with an UV-visible spectrum. This work fully reflects the scientific thinking mode of “synthesis-characterization-analysis” and breaks the traditional characteristic mode of single instrument. While making students understand the knowledge of synthetic chemistry and frontier academic research, it also improves students’ basic experimental skills and ability of applying subject knowledge comprehensively.

In order to acquaint students with the properties and applications of functional polymer materials, a research-oriented comprehensive experiment is developed. The preparation of fluorescent rare earth liquid-crystalline polymer anti-counterfeiting film and modern analytical techniques are applied to the research-oriented comprehensive experiment for polymer specialty in order to improve the innovative and practical abilities of students. The experiment includes preparation, characterization and anti-counterfeiting evaluation of fluorescent rare earth liquid crystal polymers. The chemical structures and performances of luminescent rare earth liquid-crystalline polymers are characterized by FT-IR spectroscopy, polarizing optical microscopy, X-ray diffraction, fluorescence spectrometer and thermogravimetric analysis. In order to evaluate the anti-counterfeiting property, the anti-counterfeiting film of fluorescent rare earth liquid crystal polymers is prepared. The interests and practicality are also improved by the preparation of anti-counterfeiting film. Based on this experiment, students can learn about frontier knowledge of functional polymers and basic principles and purpose of modern analysis technology, as well as the experimental operation skills, data processing skills, which can enhance the professional quality and comprehensive abilities of students. The comprehensive experiment is suitable for experimental teaching of undergraduate.

A new kind of integrated potentiometric titrator is developed. This new titrator integrates the functions of heating, stirring, acidity value and potential measurement and is much easier to operate, which can improve the stability and accuracy of experiment data. Moreover, it can be further applied to the analysis of acid-base titration, RE-DOX titration, complexometric titration, precipitation reaction and non-water titration. It is believed that this integrated potentiometric titrator can increase the diversification of measurements and largely improve the enthusiasm and interests of students in experimenting.

Combining with the elements of safety management in training room, this paper explores the co-integration mechanism of safety culture and training room management from four aspects: safety material culture, safety system culture, safety behavior culture and safety spiritual culture.

Azo compound-2,2′-diaminoazobenzene was synthesized from o-phenylenediamine under the oxidation of potassium superoxide. The coordination interaction and quantitative relationship between 2,2′-diaminoazobenzene and copper ion was analyzed by ultraviolet-visible spectrophotometry. The azo compound was prepared into test paper and applied to the determination of copper ion in actual water samples. A comprehensive experiment was designed on the basis of the experiment. The experiment contents were divided into three parts according to the theme: synthesis of azo compounds, determination of the composition and stability constant of azo and copper complexes, preparation of copper detection test paper and visual detection of copper in water samples. The experiment covers the relevant knowledge points and operation of organic chemistry, inorganic chemistry and analytical chemistry, which is suitable for senior undergraduates.

There are few research results of instructional design based on scientific argumentation. Moreover, the level of argumentation of science teachers is generally low, and the teachers have not developed the usual argumentation habits. The article focuses on the results of international empirical research on this topic through literature review. It is found that pre-service science teachers have different understandings of scientific argumentation, and the experience of scientific argumentation has an impact on the pre-service science teacher’s view of the nature of science, scientific concepts and argumentation ability. Based on the literature summary, suggestions are made from three aspects: professional curriculum setting for cultivating argumentation ability, teaching of socioscientific issues and strengthening content knowledge.

In view of the lack of clear quality pursuit and quality standards in the empirical research of education in China, this paper draws the quality requirements of achievement test, questionnaire, Likert scale in the quantitative research, clarifies the process and quality requirements of research instrument development, and clarifies the principles and content requirements of research instrument writing in the empirical research papers. Using the constructed quality index, this paper analyzes the case of empirical research paper, and points out its advantages and existing problems.

In order to improve the teaching effect of flipped classroom in the chemistry experiment class in medical university, SPOC online learning activities are combined with the process design of flipped classroom. The framework of teaching mode is built from four parts: course objective and content design, teaching strategy design, learning activity design and teaching evaluation design. In the specific teaching experiment project, the teaching procedure of knowledge imparting, internalization and expansion are elaborated. This mode breaks the barrier of time and space in experimental teaching, and emphasizes the creation of situation related to chemistry and medicine in teaching design. The results show that SPOC flipped classroom teaching is conducive to stimulating students’ enthusiasm for participation, promoting the development of thinking ability and the improvement of hands-on ability, and significantly improving the teaching effect.

The application of mind map in the course of food physical and chemical testing technology was analyzed, with examples from the classification of food detection methods, detection process, selection of detection standards, sample processing,macro nutrient content detection, micro nutrient analysis, etc. The 13 application examples of mind mapping and learning evaluation practice show that: applying mind map in the teaching of food physical and chemical testing can help learners to quickly and accurately master the learning tasks related to food physical and chemical testing, familiar with the detection skills of various substances, and complete the detection task.

Based on the cultivation of students’ autonomic learning ability, in order to help and guide students to understand obscure boring and abstract knowledge, taking 65 students from laboratory sciences in public health of our school as the research objects, we adopted multimodal teaching mode in some chapters of physical and chemical analysis of food and the traditional teaching mode was applied in the other chapters. At the end of the course, the unified questionnaires were used to evaluate the effect of the multimodal teaching mode. The results showed that there were statistical differences between the two teaching modes in understanding the abstract experimental techniques or instruments, activing classroom atmosphere, broadening learning ideas and cultivating the learning interests, the ability to autonomous learning and solve practical problems (p<0.05). Moreover, 95% of the students suggested adopting the multimodal teaching mode. The teaching practice and effect evaluation proved that the multimodal teaching mode was help to understand the abstract problems. Besides, it can not only arouse students’ interests in learning, but also cultivate their ability to solve practical problems and broaden their learning ideas.

Using the empirical qualitative study of six organic chemistry research groups in three 211 universities, certain creative training modes have been identified and summarized during the stages of project choosing, experimenting and academic paper writing. The prograduate students effectively develop creative thinking, project research and academic writing abilities through the training modes. The insightful findings may shed light on the improvement of training modes for the prograduate students in chemistry discipline.

Quantum chemical computing can accurately and vividly reflect basic chemical problems such as molecular stability and chemical reaction mechanism through systematic theoretical analysis and calculation of specific molecules. In this paper, two examples, including the stability of 1-propyl-4-chlorocyclohexane and the reduction of 4-propylcyclohexanone by sodium borohydride, were employed to demonstrate the application of computational quantum chemistry in university organic chemistry teaching. The application of quantum chemical calculation in college organic chemistry teaching is helpful for students to understand molecular structure and chemical reaction mechanism, enrich the form of classroom teaching, enhance the vividness of classroom teaching, and stimulate students’ interests in learning.

The shifts of chemical equilibrium are very important in physical chemistry. The stability conditions of equilibrium play an important role in classical thermodynamics, but they are seldom used to deal with chemical equilibrium problems. In this paper, the stability conditions of equilibrium of a simple uniform isolation system are derived according to the thermodynamic theory. The stability conditions are used to predict the influence of temperature and total pressure on the chemical equilibrium shifts. It is concluded that changing temperature and total pressure can make the chemical equilibrium shift towards stable equilibrium. This method is very simple and deepens our understanding of stable equilibrium. At the same time, the limitation of this method has been pointed out.

This paper introduces the concept of equivalent point system, and discussed why equivalent points do not necessarily indistinguishable.