CO₂ is an easily neglected indoor air pollution gas. As the gas discharged from the human respiratory system, its indoor concentration will also have an impact on human health. This paper will discuss the possible harm of indoor CO₂ to human health, summarize the existing technologies and materials for regulating indoor CO₂, analyze and compare their practicability and limitations, and put forward the future direction of development of this field.

The increasingly serious abuse of laughing gas among young people in China has attracted considerable social attention. This article introduces the brief history, preparation, structure, properties and important applications of laughing gas along with a brief discussion on the causes and harms of its abuse. The purpose of this article is to help young people understand thoroughly about laughing gas and use it scientifically. Meanwhile, it is also expected that young people will establish their own psychological defense as soon as possible and consciously resist the abuse of laughing gas.

In view of problems existing in traditional teaching mode of “mechanical foundation of chemical equipment” course, a comprehensive reform based on the concept of outcome based education (OBE) is proposed. Combining the characteristics of specialty of chemical engineering majors, some concrete measures in the teaching reform have been implemented, such as, simplifying course content, reforming teaching method and optimizing means of examination. Through the teaching reform, the students' theoretical knowledge level, engineering design ability and professional qualities have been improved, and at the same time a foundation for comprehensively improving the teaching quality of this course has been achieved.

The second recording of “general chemistry” MOOC in Beijing Institute of Technology was accomplished by using the MOOC platform of China University. In line with the goal of “personal tailored, student oriented, high-order, realistic and innovative education”, we conduct a multi-level and step-up teaching. The results show that this mode can meet the needs of students with different background, greatly improve learning efficiency and overcome the problems, such as, the online students with different levels and limited feedback during teaching. Moreover, the online teaching we carry out is beneficial to the science, ideological and political education.

Based on the scientific definition of the content of “atomic structure”, it is considered reasonable to name the chapter “atom and atomic structure”. The teaching contents should include five modules, namely, the structure and properties of atoms, the establishment and evolution of atomic structure model, the arrangement of extranuclear electrons, the introduction of nuclear structure model, and the relationship between atomic structure and periodic law of elements. The teaching key points for “Bohr atom model, description of the motion state of extranuclear electrons, four quantum numbers, the arrangement of extranuclear electrons, and the relationship between atomic structure and periodic law of elements” have been highlighted in the system. The special lecture on “basic concepts of quantum mechanics” held in advance is conducive to the breakthrough of the teaching difficult point of “quantized atomic structure model”. For each difficult point, the specific methods and measures are also put forward. It is proposed to give lessons by using the philosophical methods of divergent thinking as the main one and convergent thinking as the subsidiary one, doing something and not doing anything, and balance. The purpose is to enable students to acquire basic knowledge and learn some scientific thinking methods, learning methods and research methods after studying this chapter.

The course ideology and politics is not only a new teaching mode, but also a new teaching concept. According to the characteristics of the structural chemistry course, this paper explores and practices “course ideology and politics education” in structural chemistry from the aspects of strengthening top-level design to improve the political quality of teachers, defining educational goals and actively collecting the ideological and political contents of the curriculum, optimizing teaching methods and preparing every class elaborately, and intensifying extracurricular activities to carry out whole-process-education.

At present, with the development of internet and information technology in China, the online teaching has attracted more and more attention. How to integrate traditional classroom teaching and online teaching effectively under the new situation is the key to improve the teaching quality of colleges and universities comprehensively. This work explores and reforms the current teaching mode of analytical chemistry in our school, and establishes online and offline blended learning mode based on SPOC (Small Private Online Course). Furthermore, this work proposes a comprehensive course evaluation system throughout the whole teaching process, and finally gives some helpful suggestions for the problems of the blended learning mode.

A new type of closed bipolar electrode system was proposed for conveniently and visually determining vitamin C content in real samples. In this system, an ITO electrode with electrochromic Prussian blue films (PB/ITO) was used as the signal electrode, and the concentration of vitamin C in the samples was measured by colorimetric method. Compared the results with those obtained by titration and high performance liquid chromatography, the proposed method is more reliable, simple, practical and easy to reset, demonstrating a strong potential in applications.

Preparation of metal chromium complex and determination of its splitting energy is a comprehensive experiment in university chemistry experiment course. It is found that there are too many problems such as excessive amounts of medicines, excessive chromium waste, long experimental time and insufficient optimization of experimental conditions etc. To solve these problems, the experiment was improved in three points. Firstly, microscale-experiments were used instead of conventional experiments; secondly, ultraviolet spectrophotometry was used for determination instead of spectrophotometry. Lastly, optimization of experimental conditions was found. There were many advantages of the improved experiment in inquiry of teaching design, environmental protection, low-cost, short time and high accuracy. Through this experiment, students' awareness of energy saving and emission reduction would be enhanced, while students' interest in scientific research would be stimulated, and students' practical ability and scientific spirit of thinking would be cultivated.

In order to meet the requirements of engineering education certification, a comprehensive experiment of microwave synthesis and performance of starch-based super absorbent polymer was designed. The experiment involved the microwave-assisted synthesis, characterization and performance measurement of the super absorbent polymer based on starch and acrylic acid. In this experiment, students were required to consult literatures, understand various processes of preparation of super absorbent polymer and design the experimental scheme, master characterization technologies of ATR-FTIR and XRD and the testing technology of the swelling performance, and analyze the experimental data. In addition, an examination that integrated the process examination and result examination was also designed. Based on the teaching links such as experimental design, operation and data analysis, this examination could comprehensively evaluate the students' experimental abilities. This teaching scheme of the experiment not only improved the teaching quality, but also stimulated the students' interests in experiments and highlighted the cultivation of students' creative thinking as well as practical ability.

A comprehensive chemical experiment on preparation, characterization and performance of NH₂-UiO-66(Zr) for photocatalytic reduction of Cr(Ⅵ) was designed. This experiment involves organic synthesis, solvothermal preparation, instrumental utilization, chemical analysis, and chemical kinetics, which covers four basic chemistry experiments in chemistry major at advanced education levels and realizes the integration of these basic chemistry experiments. This experiment can guide students to explore the intrinsic link of chemistry disciplines, and facilitate subsequent research and scientific innovation experiments. Meanwhile, the introduction of photocatalysis principles and other advanced technologies into experimental teaching can attract the students' interests in learning chemistry knowledge, independent thinking, and exploring innovation, which is beneficial to the cultivation of innovative talents in chemistry major.

Dispersion polymerization is an important method for preparing monodisperse microspheres, which has been a compulsory experiment for students majoring in polymer. Traditional dispersion polymerization which is based on free radical chain-growth polymerization is difficult to prepare microspheres with high-crosslinking degree and functionalization, and requires a long polymerization time to increase the relatively low monomer conversion. This paper introduces the stepwise polymerized thiol-isocyanate click reaction with high reactivity to synthesize monodisperse, crosslinked, and functional microspheres via dispersion polymerization. In this experiment, monodisperse and crosslinked microspheres could be easily prepared under slightly stirring at room temperature. Moreover, functional microspheres were obtained via adjusting the ratio of thiol and isocyanate monomers. Compared with traditional dispersion polymerization using styrene or acrylate as monomers, thiol-isocyanate reaction in dispersion polymerization as an experiment course has advantages in theory system, skills training, efficiency and expansibility of knowledge.

Experimental inquiry and innovative consciousness is one of the core literacy of chemistry discipline advocated by “General High School Chemistry New Curriculum Standard”. Therefore, cultivating pre-service teachers' exploratory teaching ability in normal colleges plays an important role in their professional development. This article takes a chemistry teacher as the research object, applies the exploratory teaching level evaluation scale, EQUIP table, to evaluate the exploratory teaching level of his internship “oxidation reduction” 3 actual recorded lessons, and supplements the CCITIAS scale for quantitative analysis, in order to explore the characteristics of the inquiry teaching behavior of the research object. The research found the following results: (1) The research object has a certain sense of inquiry, but the level of inquiry practice is still in its infancy; (2) When repeating the university simulation classroom teaching experience, the level of inquiry is higher and the research object has a strong ability to transform the research concept into actual inquiry teaching activity strategies; (3) If there is no experience in the new teaching, the teaching behavior is still knowledge-centered, but there is a certain positive interaction with the students; (4) The research subjects adopt an evasive attitude towards unfamiliar inquiry teaching strategies, and basically adopt the traditional teaching mode.

Under the background of enrollment expansion of the higher vocational colleges, the students of enrollment expansion showed different characteristics and learning basis from the students of normal enrollment. According to the specific characteristics and course standard, the teaching reform of the online and offline blended teaching mode of food chemistry course was carried out from the set of the theoretical and experimental parts and the different teaching requirements facing different learning level students before class, in class, and after class. Multidimensional study effect evaluation was carried out from online learning grades, offline classroom performance and final grade. Combined with the questionnaire analysis of the students' evaluation of the blended teaching, the results show that the study self-discipline and initiative of the expanded enrollment have been significantly improved, the failure rate of the examination has been reduced and the students have a high degree of recognition of the blended teaching. Through the reconstruction of teaching, we try to achieve the goal of flexible and diverse teaching forms not lowering the training standards but cultivate students' good learning habits and establish their confidence to learn the course well.

This paper follows the teaching idea of “demand-centered, student-centered and learning-centered”. According to the characteristics of medical basic chemistry, the network information technology runs through the whole teaching process, such as the construction of teaching material system, the innovation of teaching methods and the reform of assessment methods. This paper explores a new mode of wisdom classroom teaching, which plays an important role in cultivating innovative medical talents in the new era.

This paper compares and analyzes the influences of traditional teaching and rain classroom teaching on the final examination results of medical chemistry for nursing majors of liberal arts and science students, and then analyzes the correlation between the application of rain classroom and exam scores. The achievements of liberal arts and science students under the rain classroom teaching mode have improved, and the gap between the students of liberal arts and science has narrowed significantly. The application of rain classroom improves the teaching effect and quality of medical chemistry, some of its functions show different degrees of relevance to the final examination paper scores of liberal arts and science students.

Academic procrastination is a common problem in the scientific research activities of chemistry postgraduates, which has become an important factor hindering their academic progress. In this study, 16 chemistry postgraduates were selected as the interviewees, and the interview data were coded. The results showed that the academic procrastination behavior of chemistry postgraduates was caused by the interaction between individual pressure and motivation, and the antagonism between personality and environment. On the basis, this paper constructs a model of the influencing factors of academic procrastination of chemistry postgraduates, and puts forward countermeasures and suggestions to improve the academic procrastination behavior.

Based on the theoretical basis of Technology Acceptance Model 3 (TAM3), with the pre-employment chemistry teachers in grade 2017 from the College of Chemistry of South China Normal University as the research object, a model of the willingness to use the handheld technology digital experiment MOOC was constructed. The study uses SmartPLS3.0 software to demonstrate the scientific nature of the model with partial least squares structural equations. The results found that Subjective Norm, Output Quality, and Personal Innovativeness have a significant positive correlation with Perceived Usefulness. Second, Self-Efficacy and Perceived Enjoyment have a significant positive correlation with Perceived Ease of Use. Personal Innovativeness has a significant positive correlation with Perceived Usefulness while the effect of Perceived Ease of Use is not significant. Third, Perceived Ease of use has a significant positive correlation with Perceived Usefulness. The two have a significant direct impact on Behavioral Intention, while Subjective Norm has no significant impact on Behavioral Intention. Based on the above results, countermeasures and suggestions are put forward for the construction of the handheld technology digital experiment MOOC.