Palladacycles, which have simple structures, stable properties and high activity, are often used as catalysts. This paper reviewed the synthesis methods of palladacycles and their applications in the Suzuki coupling reaction.

This paper introduced chemistry concept teaching based on group cooperation and students' problem driven. Through the induction and classification of problems put forward by students in preview, this study designed parallelism, modular, progressive teaching tasks to break through learning difficulties, and used interactive classroom feedback system to measure the students' learning effect timely in the classroom. Teachers distributed questionnaire at the end of class, investigated students' evaluation on the teaching process, and discussed teaching ideas and practice methods of promoting students' self questioning consciousness in chemistry concept class.

This paper analyzed teaching contents of intermolecular force, used digital experiment device to design inquiry experiments which were simple and easy to operate, designed related inquiry questions in the teaching of intermolecular forces, and effectively promoted the improvement of teaching effectiveness.

Students designed successfully a miniaturized device for the conversion of waste cooking oil to biodiesel with the help of teachers in the student-centered and inquiry-based classroom. This device represented a new way for transesterification of waste cooking oil in practice. In the process of hands-on design, students improved greatly the ability to find problems and to evaluate the solutions. Moreover, students enhanced significantly their skills in cooperation, communication and expression. Meantime, teachers also benefited from feedback during the inquiry learning.

This paper discussed the main problems in teaching of hybrid orbital, and put forward the idea of using information technology to implement classroom teaching and activities. According to the key and difficult points of hybrid orbital teaching, a set of classroom teaching tools (software) was developed, and the main functions of the tool were summarized. The classroom teaching practice based on this teaching tools showed that, in one lesson period, students could understand the basic concepts of hybrid orbital and the process of orbital hybridization, especially establish clear understanding of the orbital energy, orbital configuration and electronic configuration, etc, and solve the general problems involved in hybrid orbital.

The electric conduction experiment of solution in the current chemistry textbook for grade 9 published by People Education Press had some shortages, such as the potential safety hazard and clumsy instruments. This paper made an integrated experiment demonstration device for electric conduction of solution by using silver iodide battery, light-emitting diodes, etc, which made up for the lack of experiment in textbook. This device had the characteristics of artful, light and easy, and the effect was more obvious.

Usedthe hand-held technology, this paper compared themolecular interaction force of different liquid alcohols (homologues or isomers) through measuring the temperature change curve of them when evaporated under the same conditions, and drew the following conclusion: under the same conditions, the faster the drop rate of evaporation temperature curve, the smaller the molecular interaction force.

Used the characteristic of photosensitive resistance type photosensitive sensor module, which DO could output high level when the brightness of ambient light did not reach the set threshold value, this paper studied the effect of temperature and concentration on chemical reaction rate of sodium hyposulfite and hydrochloric acid based on a self-made experiment device. Experimental data showed that the accuracy of the device was higher than that of the naked eye.

Based on students' life experience and chemistry knowledge, this paper used scrip and charcoal to improve combustion condition inquiry experiment in junior high school chemistry textbook. The improved experiment solved the pollution problem, integrated the preparation and properties experiments of oxygen and carbon dioxide and the flammability experiment of carbon monoxide, reduced students' learning difficulty, cultivated students' innovative consciousness, reduced the experiment cost and improved the effectiveness of teaching.

Scholars had put forward different views on the rate of reaction between sodium and hydrochloric acid or water, so this paper carried out experimental study on the reaction between sodium and hydrochloric acid, and analyzed qualitatively the composition of white precipitate with theory evidence.

Used magenta solution, cupric sulfate solution and bubble water, this paper verified that hydrogen was generated when concentrated sulfuric acid and zinc particles were heated together. It was suggested that hydrogen generation was related to the self-ionization of concentrated sulfuric acid, which was confirmed by several metals.

According to the problems in using chemical data in teaching, this paper put forward some matters needed attention, such as the characteristics of certain substances, the range or conditions of data, the rationality of data in compiled exercises. It was pointed out that the scientific application of chemical data could cultivate students' scientific spirit of seeking truth from facts.