This paper introduced the structure and degradation mechanism of degradable plastics poly(propylene carbonate), which was synthesized by copolymerization of carbon dioxide and propylene oxide, and one industrial process was also showed.

This paper used qualitative and quantitative methods, classical experiments and simple reaction in the teaching of chemical equilibrium constant. Based on the qualitative cognition, this teaching design highlighted the data inquiry, qualitative and quantitative characteristics of equilibrium constant, and the application value of chemical equilibrium constant, paid attention to the differences and unification between the qualitative and quantitative analysis.

Under group preparing lessons, this paper recorded and analyzed 2 prominent teachers' heterogeneous teaching of acetylene, concluded their characteristics in 5 dimensions:teaching ideas, classroom introduction, presentation order of contents, the grasp of key points, students' participation. Moreover, this study suggested that young teachers should hold classroom teaching from 3 aspects:using students' existed cognition to construct teaching process; setting learning activities to promote students to generate independently; arousing subjective initiative to cultivate students' autonomous learning ability.

Taking the activity of "making big crystals" in Xiuquan Foreign Language School of Huadu District for example, this paper investigated the status of students carrying out experiments at home, analyzed the reasons that students failed to participate in activities, assessed the environmental friendliness of this activity, and investigated the effect of home experiment activities on students from three dimensions:the basic concept, experimental skills and emotional attitude. On the premise of environmental protection, this article put forward the basic strategies of organizing students to carry out home experiment activities in order to improve students' knowledge, emotion, will and practice.

The chess game for chemical terms learning was developed on the platform of VC++6.0 by using the MFC framework, it was the integration of knowledge, fun, challenge and expandability, and it had the advantages of brief interface, simple operation and fine practicability. In the process of playing chess, the system could automatically judge whether the move, the capture or the entered chemical equation was right or not. In the system, there were three function buttons including "Start" "Takeback"and "Exit", a menu bar and a time showing textbox. With the help of this system, students felt less bored and improved their learning efficiency of chemical terms. Besides, it strengthened communication and cooperation among students and organically blended games and chemical terms teaching.

In the combination of handheld-technology digital experiment and traditional experiment, it was necessary to explore whether the "supply voltage" and "copper sulfate solution concentration" would affect measurement of the sensor, before using pH sensor to solve the core problem "to explore the change of pH in the vicinity of anode in the process of electrolyzing copper sulfate solution". This paper made comparative analysis and comprehensive analysis of tetra-representation. The conclusions were:(1) the existence of the power supply was the essential cause of the sensor's influence, the greater voltage, the greater impact; (2) the concentration of copper sulfate solution would affect the measurement of the sensor, but it was not a simple linear relationship between the two; (3) the change trend of pH curve was consistent with the fact, which reflected the real state of ion migration and ion reaction during the electrolysis process. It would help to guide readers to look at the use of pH sensor in the electrolytic cell with a new perspective and deepen the understanding of the electrolytic process. And it provides a reference for the relevant content teaching.

This paper improved the experiment of extraction and verification of iodine in kelp:soaking kelp ash in distilled water at normal temperature, making pressure filtration by plastic bottle, using cotton bud, spot plate and waste eyedrop bottle to do microscale experiment, and recycling the obtained organic solution of iodine by means of reverse extraction. It realized chemistry experiment of homely, green and microscale.

The experiment of electrolyzing molten NaCl had high teaching value, but it was difficult to demonstrate in the classroom because of the high demand. This paper pointed out that the experiment design needed to solve some problems:the generation of high temperature, reducing the melting point of NaCl, the selection of electrodes and container, how to take metallic Na out of the system without being oxidized. Based on the research, this paper designed a demonstration experiment that could test Na and Cl₂. This experiment was easy to operate and with obvious phenomenon, it could effectively support the teaching of electrolysis.

In view of the existing gas generator had no drying function, this paper used wastes in medical and life (such as single-use syringe, infusion and ball pen refill) to design a micro gas generator with drying device.

This paper designed comprehensive experiment device in review lesson, it could finish a series of experiments including the preparation of carbon dioxide, reaction of carbon dioxide and water, instability of carbonic acid, non-flammable and non-combustion of carbon dioxide, and so on. The experiment equipments were common, the operation was simple, the phenomena were clear, and it could be used for experiment demonstration and inquiry in multiple parallel classes.

According to the toxicity of chlorine and the leakage in the reaction between metal and chlorine, this paper designed the completely airtight experiment including the preparation of chlorine, the reactions between metals and chlorine and the inquiry of chlorine water. In the experiment, the metal was heated via electric current in situ to react with chlorine, which could improve heating speed, resulted in the intense burning of metal wires and convenient recognition of products. Probing the composition of chlorine water could be carried out in a sealed bottle. This experiment was very suitable for classroom demonstration based on the following advantages:instruments were conventional and simple, the amount of reagents was small, easily to be operated with obvious phenomena and green.

This paper analyzed the educational functions of the experiment of combustion conditions in junior high school chemistry from scientific method, scientific knowledge, students' cognition transformation, and then analyzed "combustion conditions" experiment in textbook from the aspects of contrast experiments as well as epistemic logic, and finally put forward the improvement opinions and teaching suggestions.

This paper analyzed the functions of "magnesium ribbon burning" experiment in the different junior high school chemistry textbooks to core knowledge, discussed the appropriateness in the learning process of "law of conservation of mass". Based on the complexity of the reaction principle, the diversity of the experimental results, and the harm of the experimental process and so on, this paper put forward some suggestions on the operation of "magnesium ribbon burning".

This paper studied the article innovative experiment for effect of pressure on chemical equilibrium that issued on Chinese Journal of Chemical Education, No.9 2015, and improved the methods of preparing and injecting NO₂ through 12 quantitative experiments, gave the solutions to four details that could not be ignored. Finally, from the view that experimental data had no repeatability, explained that the assumption "this experiment could be done from qualitative to quantitative" was impossible.