The barbecue, which bursts out seductive fragrances from the licking flame, sizzling oil in the tumbling flame, has been loved by the people since ancient times. This paper analyzes the chemical reactions, flavor substances and reaction mechanism contained in the pickling and roasting process of the barbecue process. In view of people's concern about health, this article also explores a way to share health and delicious food from the perspective of controlling temperature and time, changing the baking method and adding active substances. By exploring the secrets in barbecue, you can not only deeply experience the close relationship between chemistry and daily life, but also use chemical knowledge to shape a beautiful and healthy utopia.

Based on the formation mechanism of fishy odor, this paper introduces the difference of fishy odor between seawater fish and freshwater fish, and reveals the formation and removal mechanism of fishy odor, in order to popularize science for the reader in the chemical knowledge contained in the fishy odor, make them feel the chemistry of life.

In view of the “pain points” such as students' low achievement degree of learning goals, insufficient awareness of thinking and innovation, and weak ability to solve complex problems, combined with the difficulty of the course itself,innovative teaching exploration is implemented in organometallic chemistry course. The reform is guided by the construction of “new engineering”, centered on students, and aimed at cultivating coreliteracy through curriculum reform and practical exploration. Based on the requirements of the core literacy of organometallic chemistry, a target system with “clarity, thinking and differentiation” as the essential quality and the key ability to solve complex problems of organometallic chemistry wasconstructed,a hierarchical/phased teaching content bearing the teaching objectives wasdeveloped along with a rich and diversified resource system, and a capability-orientedblended teaching mode integratingonline and offline,inside and outside classroomwas developed, as well as a multi-evaluation system guided by teaching goals was established. Teaching reform and practice exploration have reached the expected goal and received good teaching effect.

Practical teaching link is an effective means to enhance the comprehensive quality of engineering students, and an important way for local universities to achieve industry-education integration. Ensuring and improving the quality of practical teaching and deeply integrating it with local industries are fundamental tasks for local universities. This paper delves into the “four difficulties” in the practical teaching of the Resource Recycling Science and Engineering program at Shangluo University. Through optimizing and integrating on-campus practical teaching resources, collaborating to build off-campus practical teaching bases, jointly creating a practical education curriculum system, and solidly promoting the “integration of internship and employment,” practical teaching reform has been comprehensively promoted. This reform has improved the quality of applied talent cultivation, promoted the sustainable development of local economies, and demonstrated the significant value of local universities and related industries.

Three metallic ion doped ZnO was prepared by a simple and direct percipitation, taking inorganic chemistry and photochemistry as the knowledge background and achieving the “dual carbon goals” as the core concept. The experiment consists of 8 stages: literature research, determination of experimental plan, material synthesis, material characterization, exploration of photocatalytic performance, data processing and analysis, report writing and sharing and exchange. This comprehensive experiment can help students integrate and master the relevant knowledge of inorganic chemistry, photochemistry, instrumental analytical chemistry, and structural chemistry. It could also inspire students to experience the technological advantages of high-tech instruments and equipment, cultivate a scientific research spirit of peer learning, win-win cooperation, and daring to climb new heights in group collaboration.

A new university organic chemistry experiment has been designed that is extraction and chromatography separation of plant pigments. In this experiment, the ketchup raw material has been dehydrated by absolute ethanol, and a mixed solution of lycopene and carotene has been obtained with solvent extraction with dichloromethane. Then, petroleum ether and a certain ratio of petroleum ether and dichloromethane mixed solution are used as eluent to separate the carotene and lycopene solutions by column chromatography. Finally, cyclohexane and dichloromethane mixed solvent are used for thin layer chromatography to separate and identify the tomato pigments and carotene. The results show that both thin layer chromatography and column chromatography have achieved ideal separation effects, and the experiment success rate of students is higher. This experiment provides an experimental project for natural pigment extraction and chromatography separation in organic chemistry experiments that the raw materials are easy to obtain, the pre-treatment is simple, the experimental techniques are diverse, and the applicability is wide. At the same time, the different pigments separated are isomers, which can better reflect the technical advantages and characteristics of chromatography separation method in teaching.

Electrodialysis used for seawater salt production is a mature industrial technology, but the microscopic nature of the ion migration process under the electric field is not clear. Combined with the characteristics of electrodialysis electric field strength and solution structure research methods, innovative experiments were designed to explore the microstructure of the solution. Molecular dynamics simulation and Raman spectroscopy were used to study the microstructure of NaCl aqueous solution under 0 V and 4.5 V electric field conditions. The viscosity was analyzed to explore the relationship between the physical properties and the microstructure of the solution. The experiments are high-ordered, innovative and challenging, students will be guided to explore the microscopic nature of materials and will be cultivated innovative thinking.

In order to cultivate students' ability in preparing comprehensive experiments as well as promote the greenization and standardization of chemistry teaching experiments, we have improved the original experiment on synthesizing cyclodextrin derivatives by changing the reaction medium from pyridine to NaOH aqueous solution, and designedthe preparation experiment oftwo 6-mono-substituted β-cyclodextrin derivatives. This experiment used β-cyclodextrin as a raw material to react with p-toluenesulfonyl chloride to produce mono-(6-O-p-toluenesulfonyl)-β-cyclodextrin, further reacted with ethylenediamine to prepare mono-(6-ethylenediamine-6-deoxygen)-β-cyclodextrin. The experiment involves operations such as filtration, recrystallization, and the products are characterized by infrared spectroscopy, nuclear magnetic resonance hydrogen spectroscopy, melting point determination as well as high-performance liquid chromatography. This comprehensive design experiment achieves the integration of knowledge in organic chemistry and analytical chemistry, which can help students who have the need of scientific research or want to engage in relevant work lay a solid experimental foundation.

Inorganic and analytical chemistry experiment is the first experimental course for college students majoring in science and engineering such as chemical engineering and technology,applied chemistry. It is closely related to high school chemistry experiment and it is also the basis for students to carry out follow-up study and research work.Combined with the analysis results of the students' compulsory experiments in high school chemistry textbook of People's Education Press(2019)from different perspectives and the current teaching situation of inorganic and analytical chemistry experiments in universities,some suggestions on the teaching of inorganic and analytical chemistry experiment in university were made from three aspects:the construction of course content system,the arrangement of experiment content and the design of teaching process.It is beneficial to help freshmen realize a smooth transition from high school to university,promote the development of their problem-solving ability and innovative thinking,and it provides reference for the teaching and operation of inorganic and analytical chemistry experiments in universities.

Strengthening the energy recovery, optimizing the process parameters and improving the safety level in the rectification process are of great significance to the rectification production, which is the focus and difficulty of chemical engineering students, and also the focus of attention in the actual production. Based on the ethanol training equipment of Lanzhou Petrochemical Vocational and Technical University, this paper analyzes the problems such as unreasonable energy utilization and imperfect process, adopts Aspen Plus software for simulation and optimization, and applies hazard and operability analysis (HAZOP) to identify the safety risks. Some specific measures, such as changing the condensation mode on the top of the tower, strengthening the utilization of residual heat in the tower reactor, optimizing the feed position and increasing the interlock protection, have been implemented to transform it into a set of safe and energy-saving rectification device.

Based on the differentiated two-level teaching objectives between higher and lower levels, two-line teaching organization between online and offline, teaching content that integrates theory and practice, teaching environment where tradition and wisdom coexist, curriculum ideology that is consistent with cognition and action, and teaching evaluation that combines termination and process, a dual chain cross interactive teaching mode is constructed. Taking protein molecular structure as an example, in teaching practice, based on the dual-chain teaching mode and centered around the main teaching theme of “molecular structure”, teachers use differentiated teaching objectives to free up classroom time, and use case teaching, project teaching, and problem teaching methods to carry out deep interactive teaching activities, significantly improving the achievement of course objectives. The dual-chain teaching mode further enhances the innovative mode and gender equality of the curriculum, providing reference and ideas for curriculum reform.

In response to the problems of weak basic knowledge, insufficient ability to analyze and solve practical problems using theoretical knowledge, and lack of innovative thinking inorganic chemistry experimental course teaching, which affect the cultivation of top-notch innovative talents in traditional Chinese medicine, taking aspirin preparation as an example, a course teaching reform with “basic knowledge-innovative thinking-application ability” as the main line is constructed, aiming to stimulate students to master basic knowledge through multiple channels, cultivate their innovative application ability in applying organic synthesis to the development of traditional Chinese medicine. This teaching reform has effectively promoted the improvement of the teaching quality of organic chemistry experimental courses, laying a solid foundation for the inheritance, innovation, and development of traditional Chinese medicine.

In order to improve the teaching effectiveness of graduate students, by combining a scientific case of coal-fired thermal power plants in combustion efficiency and environmental risk assessment by using different types of coal with the scientific research project of urban haze pollution prevention and control, our team innovatively applied chemical process simulation and fault tree analysis method to the teaching of “environmental pollution and risk assessment” for graduate students of Resources and Environment. The teaching focuses on the relationship between coal burning pollutants and combustion temperature during the atmospheric environment risk assessment, and the causative mechanism of coal burning and haze pollution. The practice results show that this teaching method is helpful to concretize, animate and simplify the theoretical knowledge, and enables students to intuitively understand the relationship between content change of coal burning products and combustion temperature. At the same time, the fault tree analysis was used to guide students to clarify the cause mechanism and prevention logic of coal burning and haze pollution. It is helpful for students to master the application of chemical process simulation and interdisciplinary systems engineering theory in the field of air pollution risk assessment. It also can strengthen the training of graduate students' innovative thinking and comprehensive practice ability.

Due to the clear display and sharing capabilities, virtual simulation teaching is now common in many teaching phases. This paper talks about the “Structural Chemistry Experiment” course using virtual simulation. It covers the course design, implementation details, and its role in building core chemical literacy. The course is designed based on the entry-level quantum-chemical calculation tasks of ORCA and VMD softwares. It included seven progressive and task-focused experiments. Surveys show that this course helps students establish a model-based mindset, boost the application of quantum-chemical calculation, understand related professional basic courses, and cultivate of professional chemistry literacy.

The virtual simulation experiment course is a new mode of digital empowerment practice teaching. How to improve the effectiveness of virtual simulation experiment courses in educating students is a common concern of various universities. On the basis of summarizing years of practical experience, this article explores student-centered and demand-oriented topic construction of selected topics. Focusing on the practical problems of poor quality in course topic selection, simulation of core elements, and design of interactive steps, limited application and unsatisfactory educational effects in virtual simulation experimental courses after completion, it adopts the four initiatives of “strict control of the course content, strict control of the teaching process, focus on problem-solving, and emphasize open sharing,” to improve the teaching utilization rate and the teaching effectiveness of virtual simulation experiment courses. Strictly benchmark against the requirements of first-class courses in terms of course topics, content, knowledge points, interaction step design, expected results, etc. At the same time, quality evaluation standards for virtual simulation experiment courses are provided, the manuscript has achieved good educational results and has reference significance.

High-quality development of academic disciplines is a key requirement for the construction of “double first-class”. Chemistry is one of the key mainstream specialties in the training of talents in specialized fields in colleges and universities and the development of national industries.By analyzing the chemistry programs of the world's top universities in the United Kingdom and the United States, it is believed that their objectives emphasize the characteristics of “unity of comprehensive quality and personality growth” and “integration of social contribution and students' success”,their contents emphasize the characteristics of “harmonization of theoretical and practical aspects” and “harmonization of basic knowledge and cutting-edge theories”,their structures emphasize the characteristics of “integration of specialized and related courses” and “interaction between reticulated course organization and students' personality development”,their evaluations emphasize the characteristics of “multiple evaluation methods” and “combining process and continuity”. Combining the characteristics of chemistry courses in the world-class universities in the United Kingdom and the United States with the actual construction and development needs of chemistry courses in Chinese universities, focusing on the professionalism and characteristics of the course objectives, enhancing the modernity and practicability of the course contents, strengthening the extensibility and selectivity of the course structure, and enhancing the diversity and process of the course evaluations are the important experiences that can be learnt from the construction of chemistry courses in Chinese universities.

In the 19th century, the CGS unit was established by British physicist Maxwell et.al, and the unit of energy, erg, was proposed by Clausius; Additionally, the earliest calorie unit was proposed by French chemist Clément, and widely used in early thermodynamic research. The International System of Units was set in 1960, and joule was treated as common used international unit of energy, thus highly applied in scientific research, engineering, and teaching fields. With the development of quantum mechanics in the 20th century, electron volt and hartree units that suitable for microscopic scale description emerged. The evolution of the energy units shows the development of science from macro to micro scale, reflecting the nature of scientific theories are constantly progress in practice.

In 1797, the French chemist Vauquelin hypothesized through chemical analysis experiments that there was a new unknown metal element in the Siberian red lead mines. In 1798, Vauquelin successfully extracted chromium based on his accumulated analytical experience, which confirmed the existence of chromium and initially formed the concept of chromium. In 1803, after Dalton's scientific atomic theory, the concept of chromium was developed into a general term for atoms with an atomic weight of 24. Since the 20th century, with the establishment of atomic structure theory and the rise of isotope chemistry, scientists discovered a total of 27 chromium isotopes. Thus, the modern concept of chromium was formed: the general term for a class of atoms with a nuclear charge of 24. In short, with the development of scientific thoughts and scientific methods, the concept of chromium is also evolving.