In recent years, the research of nano titanium dioxide photocatalytic material focuses on how to improve the photocatalytic efficiency and develop new fields of application. Semiconductor photocatalytic technology and preparation methods of nano titanium dioxide are introduced,and methods of improving catalytic activity properties of nano titanium dioxide are given by examples from nano material composite system,complex structure and crystal surface induction. Fields of application and difficulties of development are also discussed.

Based on high school chemistry knowledges such as galvanic cell, redox reaction and the silver mirror reaction, the basic principles of two technologies of silver-assisted etching of single crystal silicon are introduced, in order to extend knowledge of high school chemistry.

The article focuses on the current problems of the freshman in inorganic chemistry learning. Our solutions are lively and specific teaching materials and cases. The ability of using knowledge can be cultured, as the result of the combination of principles of inorganic chemistry and living examples. The study interest and operational ability can be trained and inspired by the combination of principles of inorganic chemistry with interesting chemical experiments, and the difficulties of learning by rote in inorganic chemistry of elements can be resolved by the combination of inorganic chemistry of elements with principles of inorganic chemistry.

The authors thought over traditional teaching of organic chemistry, discussed training of students' professional qualities by using of several teaching tools,and integrating information, interest and practice.The authors suggested that teachers should actively guide students on experimental practical training when the students have mastered basic knowledge, which would help students clear their professional horizon, stimulate their desire for knowledge, enhance their competitiveness.

On the English for science and technology (EST) teaching in chemistry major, a few suggestions were proposed, including making clear of the characteristics of EST for students, combining classroom teaching with research and production instances, using flexible teaching methods, and reinforcing learning through better homework. Through the improvement of classroom teaching, homework layout and other aspects, we hope the EST level of high-grade students in chemistry and related majors can be significantly improved in one or two semesters.

To train students' ability of logical thinking is an important target in university chemistry teaching. Based on research of teaching practice,the approaches for training ability of logical thinking include heuristic teaching,application of mathematical knowledge,use of tree root graph,and cooperative inguriy learning mode.

A comprehensive design chemical experiment of synthesis of 5-(4-antipyrine azo) salicylaldehyde and determination of niobium(Ⅴ)by spectrophotometric method and its teaching plan were introduced. The homemade antipyrine azo salicylaldehyde was used as chromogenic reagent in color reaction with niobium (Ⅴ) ion. The effect of sensitization of the color reaction about 5-(4-antipyrine azo) salicylaldehyde and niobium (Ⅴ) in the presence of pairing surfactant compound was discussed. Through this comprehensive design chemical experiment, the students' understanding and applying capability of some certain knowledge about organic synthesis, physical chemistry and analytical chemistry were enhanced, the students' practical ability and the comprehensive innovative ability were improved. It is beneficial for training practical talents.

Based on the reformation of chemical experiment teaching, the students' problems and ability in chemical experiment study were analyzed. Some management theories were innovatively introduced in basic chemical experiment teaching including "Broken Window Effect","Catfish Effect" and "Cannikin Law" etc. It was found that the teaching effect was significantly improved by applying these theories to train students' comprehensive capacity.

In order to improve the quality of experimental teaching, the problems which exist in the chemistry experimental teaching are analyzed, and the advanced educational idea of "HEART" is established. Based on this idea, studies are carried out on teaching system, teaching method, teaching team and evaluation of teaching quality in experimental teaching. Finally, the "two infiltrations, four combinations" experimental teaching system is constructed, and students' innovative spirit and practice ability are improved. A kind of student-centered happy teaching method is established, which can inspirit the initiative and creativity of all students. The system of teaching quality evaluation is created, and the incentive system for teacher is improved, so as to make teachers unceasingly enhance their ability in experimental teaching. Flexible operational mechanism of experimental teaching reform is formed.

Medical chemistry is one of the basic compulsory courses for students who major in nursing speciality, which requires students' basic knowledge of chemistry. In general, liberal arts students may find it difficult to have good performance in this subject because of poor foundation. To promote teaching effect, course content and teaching methods were improved.

The Gaussian software was applied in taching of infrared spectroscopy. It is helpful for understanding the molecular spacial structure,the theory of vibraional spectroscopy, and the assignment of the vibrational modes;and improves the interest of classroom,and the vividness of teaching content.

Based on the problems of teachers, students and teaching materials, a new bilingual teaching mode of basic chemistry is proposed, which emphasizes firm foundation and foreign teachers, combined with the chemistry and English level of students. An investigation was made in order to find the problems of bilingual teaching. Some practical suggestions were given, and the orientation and teaching methods were discussed.

The theoretical calculation method was employed to interpret the stepwise decreasing of bond dissociation energies of NH₃. The calculated results showed a decrease of the bond dissociation energies and an increase of the bond lengths with the decreasing number of binding hydrogen atoms. With the increasing number of binding hydrogen atoms to nitrogen atom, the increasing promotion of 2s electrons (N) to 2p orbitals (N) gives rise to less screening effect, the more electron transfer of 1s electrons (H) to 2p orbital (N) increases electrostatic interaction between nitrogen atom and hydrogen atoms, and the enlargement of the angle between unpaired electron (p orbitals) or lone pair electrons with N-H bond decreases repulsion. The three factors cause stepwise decrease of bond dissociation energies of NH₃.

Shen Kuo is a famous statesman and scientist in the history of China. He recorded a lot of chemistry knowledge in his book Meng Xi Bi Tan, such as petroleum, salt, copper-smelting, iron-smelting and so on. The ideas of colloid and geochemistry are also infiltrated in the book. Some of the contents which he had studied are still influencing modern chemistry.