After studying the relevant requirements in the new curriculum standards, and analyzing the types and presentation methods of situational materials in the compulsory textbooks of Luke edition, we can draw the following conclusions: micro-projects make the practical situation produce a marked effect, historical situations manifest our Chinese self-confidence, and those situational materials fully reflect the STSE education concept. Based on this study, three teaching suggestions are proposed for the sake of turning from static textbook situation to dynamic teaching situation: to give full attention to the contextual teaching function contained in the textbook columns; to explore deeply the core literacy carried by the textbook contextual materials; and to take the overall design choices to teach and present situational material into consideration.

The evaluation of chemical experiments is of great significance for cultivating students' innovative consciousness and practical ability. The study attempted to design “teaching-learning-assessment activity” to prompt students' chemistry learning and develop experimental ability by applying the chemistry school-based assessment of high school in Hong Kong. The study first introduced the framework and guidelines of the chemistry school-based assessment of high school in Hong Kong. Then, by referring to 2017 curriculum standards, the experimental evaluation scale was designed with the example of “ferric salt and ferrous salt” in Chemistry 1 (PEP Ed., based on 2003 curriculum standards). Through evaluation feedback, a more scientific and comprehensive diagnosis and evaluation of students' experimental ability performance is made, and then provides an improved basis for teachers' chemistry teaching practice.

Based on the development history of aspirin, this paper explores the evolution history from salicylic acid to aspirin to long-term sustained-release aspirin and composite drugs. Based on the real situation of the development history of drugs, taking the problem driving this development as the clue, it promotes the teaching content in the continuous problem-solving, not only implements the design of organic synthesis route, but also enables students to understand that based on the idea of molecular structure modification for the preparation of new drugs broadens students' vision and plays an important role in organic synthesis in solving real situations and real problems.

The core literacy oriented proposition framework emphasizes that both situation and knowledge contribute to problem raising and solving. By creating complex task situations and using problem-based learning, we guide students acquire procedural and epistemic knowledge independently in the process of applying content knowledge to solve real problems, cultivate the overall understanding of the discipline, form strict knowledge structure system and thinking logic, develop “evidence reasoning and model cognition, changing concepts and balanced thoughts”.

The aim of this research was to explore the effect of the pithy formulas-oriented teaching method on students' ability to analyze redox reactions in the teaching of redox reaction in senior one. The analytical ability includes the extent and speed of analysis for the simple redox reactions and the depth of analysis for the redox reactions with different complexities. The results showed that the pithy formula-oriented teaching method had a good immediate effect and retention effect on the formation and development of students' analytical ability in the experimental group. Students in both experimental and control groups improved their analytical ability significantly in the teaching process, representing a different process of ability development. Some suggestions on teaching and research were given.

This study uses (1)O₂/CO₂(2)Cl₂/NH₃ that are required to master the gas preparation and properties and important intermediate gases(3)C₂H₄/SO₂ that are not required to master the gas preparation as the three levels of advanced inspection to test 156 high school students in Beijing's model high school. The results shows that the depth and the systematism of the students' knowledge reserves are not good, especially in the process of gas purification and collection; students have difficulty in extracting external information effectively and their ability of chemical reading needs to be improved;the three levels of advanced level is obvious, from easy to difficult,the lower level as the important foundation of the higher level. Based on this, this research puts forward corresponding teaching strategies.

It is the core issue of unit design to transform the curriculum standards into learning objectives. Based on the unit design and practice of different modules of chemistry in Beijing National Day School, this paper summarizes the step-by-step strategies how to transfer curriculum standards to unit learning objectives, including the deconstruction of key words in curriculum standards, the reconstruction of unit core based on core literacy, the transformation to learners' objectives based on learning tasks, and the complementarity of learning migration and construction. This method can also be used in design of learning units in different modules of chemistry and may be applied in other subjects.

In the background of technology development, blended learning has become a trend of teaching. This study attempts to build a blended teaching process framework and verify its teaching effectiveness with junior middle school chemistry as an example. The research shows that the process framework has a certain role in promoting teaching, and puts forward the reason discussion in three aspects: activity design, process evaluation and data management.

Teaching paper is a key indicator of evaluating the professional qualities and competences of outstanding teachers in high schools. This research analyzed 1 196 teaching papers written by 119 outstanding high school teachers based on bibliometrics and content analysis method. The research results reflected the current situation of the teaching research of excellent chemistry teachers in high school, and the present focus of the teaching research of high school excellent chemistry teachers. The purpose was to provide some directions and references for the general chemistry teachers to participate in education research.

Based on the statistics of 157 chemistry examination papers in 2019, and the investigation and interview of chemistry educators in some provinces and cities, this paper analyzes the proposition mode, examination organization, test paper structure and performance presentation of the current high school entrance examination in China,and then puts forward suggestions on further improving the quality of the proposition, building a reasonable test paper structure, and promoting the reform of the examination.

The natural population analysis charge (NPA charge), atomic dipole moment corrected Hirshfeld population charge (ADCH charge), atoms in molecules charge (AIM charge), and natural electron configuration were simulated by computational chemistry at MP2/6-311+g(d), B3LYP/6-311+g(d), HF/6-311+g(d), QQQQQQQQQQB97XD /6-311+g(d) level. The simulation results indicate that the covalence of nitrogen is negative and that of chlorine is positive in NCl₃.

To further improve the precision and generality of the detection of iron content in iron supplements by image colorimetry, the influence of shooting environment on the results was investigated, the quantitative parameter suitable for image colorimetry was confirmed, and the colorimetric results with solutions in different containers were compared. The content of actual samples and the recovery were measured under the optimal conditions. The results showed that the key to obtaining reliable data was collecting a single image of samples, standards, and blanks. It presented the best linear relationship between the absorbance values converted from the R values of the solutions and the concentration. Analysis of the images of these solutions in cuvettes, test tubes and drip board produced data that were suitable for quantitative colorimetric analysis. The recovery for this method was >95%. With the characteristics of easy operation and accurate, the method could be widely used in high school chemistry laboratory with various conditions.

After years of experimental exploration, it was found that the interesting chemical experiment “ignited into a snake” could be done without catalyst, and the experimental result was obtained by burning a mixture of sucrose and sodium bicarbonate directly. The “catalyst” only as an adsorbent for the concentrated heating of the reactants, which made the experimental phenomena more obvious, however, there was no “catalytic” effect on the chemical reaction. Therefore, it is recommended that ordinary laboratories use sand or fine loess to carry out this experiment on the base of the iron stand.

This paper improved the experiment of “combustion conditions” in chemistry textbook published by People's Education Press. Water bath heating, temperature sensor, nitrogen atmosphere protection and portable oxygen cylinder were introduced for innovation. The improved experiment was highly efficient, scientific and environmental friendly.

Based on the mechanism for chlorination of methane, this paper analyzed material system, reaction vessel, light conditions and experimental characterization, and then designed methane and chlorine substitution reaction. The research findings were supported in terms of experimental data collected by pressure and temperature sensors in digital experiment to explicitly characterize the “substitution” process of methane and chlorine. The research provides implications to improve the experiment of chlorination of methane.

Aiming at the blank status of electrolytic organic matter in middle school chemistry experiment teaching, this paper developed a demonstration experiment of electrolytic acetaldehyde in the classroom by using Schiff reagent to qualitatively detect the concentration of acetaldehyde in electrolyte. This experiment combines the redox reaction in organic chemistry with the electrolysis process to develop students' understanding of the working principle of the electrolytic cell and the mechanism of organic chemical reaction. Through the experimental exploration, the core literacy about “scientific inquiry and innovation consciousness” and “scientific attitude and social responsibility” are developed.

In order to reduce the ambient temperature and oxygen concentration, an instrument was designed to observe the effect of ambient temperature change on the flame color of hydrogen fuel. It was found that the flame color of hydrogen containing fuel was generally yellow, and it turned to very light blue (under bright conditions) after reducing the ambient temperature. It was proved that the excited state of water molecules in the combustion process was the important reason for the change of flame color from blue to yellow. The flame color reaction of sodium element was not the only reason for the yellow flame of alcohol lamp. Four kinds of visible spectral lines of hydrogen atom spectrum were observed by accident during the temperature reduction test of flame color of butane spray gun, which provided a reference direction for the future search of this spectral line. The research process can be used as the research material based on the real situation. Through the discovery of problems, the improvement of instruments and the summary of laws, the ability of students to solve real problems by using chemical knowledge can be improved, and the core literacy of students can be cultivated.

With the principle of mutual transformation of matter, the experiment of reduction of copper oxide by carbon monoxide was designed in only one test tube. Sensors were used to collect data of improved experiment to train rigorous consciousness of evidence for students. From the gas preparation to the treatment of exhaust gases all reflected the concept of green chemistry. The integrated design of experiment, less drug consumption, simple operation, short time, and obvious phenomena, improved the participation of students and elevated the teaching effect remarkably.

Using CiteSpace visual bibliometric analysis software, this paper analyzed the competency-based chemistry classroom teaching designs from the three most influential academic journals(Chinese Journal of Chemical Education,Education In Chemistry,Teaching and Learning Reference for Middle School Chemistry) in the field of chemistry education and teaching in China since 2016, which aim was to provide a useful reference for the follow-up competency-based chemistry classroom teaching design by grasping the research hotspots and development trends.

The knowledge of “neutralization titration” has its own generation and development order. Combining with the production and development of titration analysis, the discovery of indicators, the invention and improvement of burette, etc., it can guide students to understand the process of knowledge construction, and also can help to cultivate students' scientific attitude and innovative consciousness, and develop students' chemistry key competencies.

In the 18th century,Cavendish discovered hydrogen and thought that it was a compound of water and phlogiston; But Lavoisier who discovered the composition of water thought that hydrogen was an element. By the 19th century, after the establishment of the atomic molecular theory, hydrogen was thought to be a simple substance consisting of diatomic molecule. In the 1930s, the discovery of hydrogen isotope made people have a new understanding of the concept of hydrogen element, and gradually formed the modern concept of hydrogen element. The development history of hydrogen concept is not only the development history of element concept, but also the evolution history of scientific thought and the development scientific method.