The electronic structure properties of the rare-earth elements are briefly introduced herein. Some of the rare-earth elements applications in permanent magnets, single-ion magnets, MRI contrast agents and molecular qubits are also discussed.

Tin disulfide has become one of the hot topics in the research of anode materials for sodium-ion batteries due to its advantages including high theoretical capacity and suitable redox potential. This article summarizes the development of tin disulfide-based anode materials in recent five years from three aspects:pure tin disulfide, tin disulfide/carbon composites and tin disulfide/graphene composites.

The MP2/6-311+G^** theoretical method was employed to investigate the structures and electronic properties of methyl radical and silyl radical. The results show that C and H in methyl radical are negatively charged and positively charged, respectively, while Si and H in silyl radical are positively charged and negatively charged, respectively. The p orbital component of bonding orbital of central atom in pyramidal structure is more than that of planar structure for both methyl radical and silyl radical. The central atom of planar structure tends to be electronegative in comparison to that of pyramidal structure. The sign of Laplacian electron density for methyl radical is negative, while the sign of Laplacian electron density for silyl radical is positive. The conclusion that the difference between methyl and silyl radicals is due to different electronegativity proposed by Pauling was confirmed.

As one of the teaching difficulties of physical chemistry, the solid-liquid phase diagrams of two component system have been deeply discussed by the group discussion teaching method. In the end, several basic rules have been summarized for these kinds of phase diagrams, so that students can easily grasp the analysis methods for complex phase diagrams and lay a good theoretical basis for the subsequent courses and practical application.

Some organic compounds without carboxyl group, but still showing a certain acidic even obvious acidic through the C-H or O-H bond heterolytic dissociation under a certain condition, are known as the pseduo acid or carbonacic acid. We summarized several typical non-carboxylic acid organic compounds, including nitromethane, aldehydes and ketones containing α-H, ethyl acetoacetate, acetylacetone, diethyl malonate, terminal alkyne, alcohols, phenols and their derivatives. From the point view of electronic structural features, a brief analysis of the nature and influencing factors on acidity are performed. This will contribute to a comprehensive and systematic understanding on the acid property of these kinds of organic compounds.

A comprehensive experiment, metal-organic frameworks(MOFs) as the electrode material for supercapacitor is introduced. The experimental contents include the preparation of MOFs, single crystal structure characterization and electrochemical performance testing. Through the characterizations of the preparation of MOFs, electrode preparation and electrochemical energy storage, students could fully understand the current popular scientific frontiers. This experiment integrates the relevant knowledge points and experimental operations of inorganic, analytical and physical chemistry, which can be opened as an open experiment for senior students.

The control variable method with X-ray powder diffraction characterization technique were employed to explore the influencing factors of precipitate form, crystallinity as well as experimental time and product yields in purification of crude salt. The research result indicated that the best conditions for the second filtration of crude salt purification are as follows:the stirring speed is 1 rotation per second, the dosage of crude salt is 8 grams, and the heating time is 12 minutes. The precipitation separate out all in crystal form under the above condition and the product yield in 76.25%.

A comprehensive experiment of organic chemistry has been introduced in this paper. Many techniques will be demonstrated though a project that will consume about twelve weeks of the course. This complete project is the synthesis of vanillin starting from whole cloves, which have no vanillin. During this project, the students extract eugenol from whole cloves and then synthesize vanillin from it. Along the way, the purification of the intermediates will require many different techniques, including distillation, synthesis, and crystallization. In order to determine the purity of the compounds after purification, the IR and UV-Vis spectrometers, and the HPLC chromatography instrument will be used.

Preparation of methyl salicylate is a classic organic chemistry experiment, which can be used as an assessment experiment. Teachers can examine students' operation skills and give students grades according to the quality and purity of products. The experimental scheme provided currently in the textbook is not reasonable, which leads to the low yield of the product. Aiming at the shortcomings of traditional experimental methods, we proposed a new experimental route of using sodium carbonate to neutralize sulfuric acid (removing catalyst) and then distilling and separating the methanol. The improved experimental scheme is more reasonable. It avoids the decomposition of methyl salicylate, improves the yield of the product, and obtains better experimental results.

The conducting polymers as the supercapacitor electrode materials can be introduced into the undergraduate teaching experiment. This paper designed a comprehensive experiment:electrochemical deposition preparation and characterization of polyaniline nanoarray. Firstly, the conductive polyaniline nanoarray can be obtained using electrochemical deposition method. The chemical structure, morphology and electrochemical properties of polyaniline nanoarray were characterized by the ultraviolet-visible spectrum, Raman spectrum, scanning electron microscope and electrochemical workstation, respectively. The experiment can make the students understand and grasp the reaction mechanism and synthetic method of electrochemical deposition for conductive polymers. On the other hand, the experiment also makes the students learn more large instruments and equipment operation, and help them to improve the practical operation ability. This comprehensive experiment is a good combination of chemical preparation and material application. The method is simple, short time-consuming and good reproducibility. It can be used as a comprehensive inquiry experiment for polymer undergraduates

A perovskite catalyst was prepared and its microwave induced catalytic degradation of basic fuchsin (BF) dye wastewater performance was tested. The microwave catalytic technology and modern characterization technology were combined with environmental chemistry experimental teaching. The LaMO₃ (M=Fe, Ni, Co, Cu, Mn) catalyst was prepared by sol-gel method. N₂ adsorption-desorption instrument (BET), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA) were used to characterize the structure, morphology and microwave catalytic activity of the catalyst. The effects of the different B-site metal of perovskite on the microwave catalytic activity of BF were investigated by characterization data and performance test results. The mechanism of the catalytic reaction was further explored. This comprehensive design experiment will enable students to acquire the frontiers of the advanced oxidation technology, broadening their professional vision, and training their comprehensive thinking, scientific research spirit and innovation ability.

Fostering full-time master of education (Subject Teaching-Chemistry) graduates is a challenge and brand-new research topic. Three aspects of "target orientation", "curriculum optimization" and "practice improvement" were adopted to discuss the cultivation of chemistry educational graduates. From "target orientation", it should foster chemistry educational graduates to have better chemistry classroom teaching and research abilities; from "curriculum optimization", it should optimize a better functional and structural curriculum system; from "practice improvement", it should construct a full-type and whole process practicum platform based on scientific lesson polishing mode.

The rigid docking method of molecular docking was employed in classroom teaching with the aid of the Discovery Studio software. It is helpful for the students' understanding about the interaction mechanism between ligand and receptor, thus the quality of classroom teaching would be improved. At the same time, the introduction of this software can help students to do self-practice after class and deepen the understanding of non-bonded interactions between molecules.

Facing problems related to laboratory safety in academic environment, this article explains a laboratory security access platform based on simulation experience. The platform services include visual simulation learning, safety tests, safety access authentication and safety management. The article explores ideas of simulation education and safety management. The implementation of the laboratory security access platform helps promote interests in safety learning, enhance the effectiveness of safety training. By establishing a diversified and standardized security education system, the platform allows for a shared and dynamic security management environment.

According to the statistics of the Nobel Prize in science over the past 100 years, the development of organic synthetic chemistry has gone through three stages:the classical organic synthesis stage, the artistic organic synthesis stage and the scientific design stage.This indicates that organic synthesis will continue to develop in the fields of new reagents, new reactions, new methods and new theories, and will have broad prospects in the fields of chemical biology, molecular engineering and green chemistry.