Iron is abundant in nature and active in chemical properties, it can form a variety of widely used substances and materials, and has great development potential. This paper briefly describes the discovery and properties of iron, and emphatically introduces its function and application. The application of iron mainly focuses on the important role played by iron and its compounds in the fields of medical treatment, energy materials and environmental protection.

Taking medical surgical masks and new nano masks as examples, this paper analyzes materials, manufacturing technology, and protection principles of masks. The paper intends to cast light for the public on relationship between materials, effectiveness and performance, and how to select masks accordingly. Also, it will impact positively on promoting science literacy and the awareness of public health and safety.

Based on the research progress of phosphorus chemistry, this paper has comprehensively investigated the other allotropes of phosphorus, including phosphorus nanomaterials and phosphene, which are advanced materials with special structures. Then itintroduced their preparation, composition, structure, properties and important applications.

In order to solve the problems in teaching process, such as the connection between theoretical and practical teaching is not close enough, students' abilities of self-learning as well as using knowledge are both weak, an integration teaching mode is designed and practiced to cultivate and improve students' abilities of applying theoretical knowledge to analysis and solve practical problems.

Education scholars at home and abroad have paid more attention to scientific writing ability. As one of the typical forms of scientific writing, the quality of experimental reports is often neglected in teaching. This research proposes that experimental report writing ability should include three dimensions: the completeness, the standardization, and the scientificalness. Based on the experimental tasks of a physical chemistry course, an evaluation tool with good reliability and validity for physical chemistry experimental report writing ability was designed.

Taking preparation of ethyl acetate as the experimental content and adopting a photo-assisted method, the writing of the experimental report was reformed. The specific method is: during the whole experiment, students are required to use mobile phones to take pictures of the quality and state of solid materials and the volume of liquid materials; the effects of the construction of distillation and reflux devices, the direction of condensate, the position of mercury balls, and the dry state information. After the experiment, the pictures taken during the experiment are displayed in the form of a flowchart; the photos related to the material data and status are sorted out; and the process photos are edited and beautified according to the format of a professional journal. The results of practice show that the new method can effectively prevent students from plagiarizing experimental reports with each other; the process of re-editing pictures can make students familiar with the experimental content to the greatest extent; finally, the experimental reports with pictures and texts help teachers judge whether students have mastered the teaching content or not.

Taking the preparation of electrochemical sensor as an example, this paper discussed the cultivation of students' creative ability in the context of STEAM education and “new engineering”, which mainly adopts the promotion mode of cultivating students' basic skills with a single topic, enhancing their professional ability with multiple themes, and improving their comprehensive creative ability of interdisciplinary integration of “Internet+project”. Through the experiment, the teaching method under this mode has achieved certain results.

The Suzuki-Miyaura cross-coupling of 4-BrPhCOCH₃ and PhB(OH)₂ with β-cyclodextrin ligand in water is a green alternative to conventional methods using poisonous phosphine ligands and organic solvents. The effects of the ratio of Na₂PdCl₄/β-CD, the amount of Na₂PdCl₄ or PhB(OH)₂, reaction temperature and time on the yield were investigated by the single factor experiment. By guiding students to recognize the β-CD structure and discuss the mechanism of this reaction, our teaching practice not only make them realize the importance of green chemistry, but also stimulates their interests in scientific research. Moreover, such a reaction is an environmentally-benign and mild experiment with short reaction time, high yield and good repeatability, thus applicable completely to the undergraduate curriculum.

In order to guide students' experimental operations promptly and fully,strengthen reflections and exchanges among students in the course of the experimental teaching, based on the existing chemical simulation experiment platform to assist the teaching theory experiment, the WeChat platform and chemical simulation experiment platform were used to assist the teaching theory experiment by the research team. The simulation experiment platform designed and produced teaching micro-videos for the process of experimental operation and experimental teaching. A new mode of information teaching was constructed in a manner of speaking. Practical results show that this mode meets the needs of students for individualized learning and hierarchical teaching, and the teaching effect of chemistry teaching theory experiment in normal universities is improved, and it has practical value.

From the lens of PCK, this study made an investigation study about pre-service chemistry teachers' perception of scientific inquiry teaching. The study coded teachers' PCK components through and analyzed the integration level based on the PCK Rubric. The result indicated that participants generally lacked understanding about the scientific inquiry teaching. Thus, the study made some advices for the develop of chemistry preservice teachers.

The reform and practice of integrating the ideological and political education have been carried out into “Pharmaceutical Chemistry”. First of all, four quality objectives are extracted based on the knowledge and ability of pharmaceutical chemistry, and then are rooted in the curriculum standard; and the best teaching resource carrier to express the four quality objectives is selected, and different teaching modes are designed to express four quality objectives in the classroom; finally, the quality objectives are promoted by adding the content of quality objectives assessment in the teaching evaluation. Through the above ways, we can give full play to the moral educational function of professional courses.

Based on the scientific research project, a chemical professional experiment is recommended: preparation, characterization and performance determination of novel hydrophobic associating polymer. This experiment can make the students master the basic principles of free radical copolymerization, understand some basic operations of large instruments, polymer characterization methods and structure analysis methods. Besides, it is benefit for students to grasp the deep theory relationship of hydrophobic associating polymer between structure and properties.The experiment is derived from the scientific research, and involves polymerization reaction, structure characterization and performance test of macromolecular solution. Thus, this applied and research based work is integrated, advanced, valuable. This experiment is helpful to improve the level of students' professional experiment, improve students' comprehensive quality, innovation consciousness and practice ability.

Based on the characteristics of environmental chemistry and the new requirements of talent cultivation in the contemporary era, this paper presented a primary research on how to apply the online-offline teaching model of the rain classroom in the teaching reform of environmental chemistry courses. The practice showed that the teaching mode can improve the students' interests and autonomy in learning, improve the students' ability to analyze and solve problem, promote the interactive communication between teachers and students both in class and out of class, and fully embody the subject status of students in the process of teaching.

The course of analytical chemistry in traditional Chinese medicine has some problems, such as a focus on teaching, less interaction between teachers and students, and poor teaching effect. Therefore, this paper changes the traditional teaching mode to the “online and offline (O2O)” hybrid teaching mode. Teachers use Tsinghua online network platform, rain class, China MOOC and other network resources to carry out curriculum construction, and reform the classroom teaching of analytical chemistry. Additionally, they reconstruct the teaching philosophy and teaching process, turn over the role of teachers and students, integrate online and offline teaching organically, and use online learning resources and test platform. The above things can help students learn freely in time and space to achieve the purpose of personalized and differentiated learning for students.

In this paper, we restructured the curriculum standards with innovative application capabilities and job requirements, updating teaching methods and models,andsystematically explored the usage of flipped classroom and PBL teaching model on pharmaceutical analysis from designing, processing, evaluation and effect. It aims to form a diversified and multilayered new teaching system of pharmaceutical analysis, transform the teaching model from “focusing on teaching” to “focusing on self-learning”, lead the students turning “negative” into “positive” learning, train students' self-learning ability, enhance team cooperation ability and skills to analyze and solve problems, and inspire students' innovative application capacity.

As cyanide is a highly toxic chemical, the use of cyanide is strictly controlled, andthe experiment of cyanide leaching of goldcannot be opened to undergraduate students in laboratory experiments. By using virtual simulation technology, this barrier is broken down. In this paper, the design idea, system implementation and teaching process of the virtual simulation experiment of cyanide gold leaching are presented. According to the investigation of students' learning motivation, course experience, and learning effect, shows that students can learn and master the cyanide gold leaching experiment through the system generally. The survey results also show that students have a good understanding of the principle, process and influence of main parameters of the cyanide gold leaching experiment by using virtual simulation experiments.

In acid-base equilibrium and complexation equilibrium, distribution fraction is used to illustrate distribution of all types of components under various conditions. And predominance area diagram (PAD) can be drawn accordingly. Using PAD, it is simple, intuitive, and convenient to analyse dominance distribution. Furthermore, PAD can also be used to resolve many problems related to equilibrium and titration. In this paper, the authors try to discuss plotting and application of PAD in analytical chemistry teaching combined with some specific examples.