How do the outstanding scientists make significant findings and expand the scope and depth in a new research area? This question draws great attention from the researchers in science, science policy and science education.Based on data mining technology and archives reading on the scientific works in asymmetric synthesis, this paper presents the scientific concepts and aims network of the chemist Lixin Dai, and analysis how his research strategy promotes a cutting edge field in China and connects the global knowledge flow.

Combined with the curriculum standard, the relevant materials are deconstructed and integrated from the aspects of fertilizer composition classification, chemical production, mechanism of action, simple identification, environmental impact, etc. In teaching practice, we should follow the spiral path of knowledge advancement and perfect students’ cognitive structure and thinking paradigm. By means of scientific inquiry in life, students’ practical ability and innovative spirit are cultivated. Relying on the discussion of social science issues, improve students’ STSE accomplishment, so as to show the truth, goodness and beauty of chemistry in an all-round way.

Understand the connotation of chemical aggregation thought, clarify the level and path of chemical aggregation of substances, understand the process of particles from one to many based on electronic structure, spatial structure and aggregation structure, understand the aggregation structure based on aggregation unit and aggregation mode, understand the relationship between structure and nature based on the perspective of aggregation, form a systematic and scientific chemical aggregation thought, and improve the understanding level of senior high school teachers in the subject of chemical aggregation thought, the teaching value of the thought of chemical aggregation is deeply explored and excavated.

Based on Bloom's taxonomy theory of educational objectives, and on the basis of the division of core literacy and its level of chemistry discipline, this paper makes statistical analysis and comparison of after-school exercises of “sulfur and its compounds” in different versions of senior high school chemistry textbooks from three dimensions of core literacy level, knowledge and cognition. The results indicate that in terms of core competencies, the three editions of textbooks mainly design exercises on the first and second levels of core competencies, highlighting “macro identification and micro analysis”; More emphasis is placed on the examination of “procedural knowledge” in the knowledge dimension; In terms of cognitive dimension, the three versions of textbooks focus on the levels of “understanding” “application” and “analysis”, but each has its own emphasis. Based on this, suggestions for using textbook exercises are proposed.

This paper compares and analyzes the changes of evaluation recommendations in the 2011 and 2022 editions of the compulsory education chemistry curriculum standards, summarizes the new features of evaluation recommendations in the 2022 edition of the compulsory education chemistry curriculum standards, and then proposes inspirational suggestions for new curriculum evaluation practices and reforms, with a view to providing references for understanding and implementing the new curriculum standards.

Four groups of digital experimental situations were created to transform the more abstract precipitation dissolution equilibrium into a simple curve representation. The students actively solved the problems associated with the curve and progressive layer by layer. While solving the problems, they recognized the “solubility” of insoluble electrolytes, constructed a precipitation dissolution equilibrium model, understood the concept of solubility product through quantitative calculation, and judged the movement of equilibrium using the relationship between Q and K_sp. Among them, the digital experiment of turbidity measurement with turbidity meter sensor solved the problem that adding sodium carbonate solution to calcium carbonate saturated solution can not observe the phenomenon of solution becoming turbid with naked eyes.

Under the concept of “structure determines nature”, this course is based on the “exploring the structure of flammable ice” to teach “using multiple theoretical models to analyze, explain and predict the spatial structure of molecules”,taking “combustible ice” as the object of study. Through three core activities including “recognition of methane molecule, using ‘balloon’ to recognize water molecule and recognition of ‘ice cage’ consisted of water molecule”, this course constructs a thinking path, which utilizes hybrid orbital theory model and hydrogen bond model jointly to interpret molecule structure and utilizes valence shell electron pair theory model to predict molecule structure. The final goal is to reveal the diversity and complexity of the covalent molecule through the process of solving actual problems.

Transdisciplinary practice is a bond of integrated development of core competency among various academic disciplines. Taking “iron-system food deoxidizer” as the activity theme, the instructors attempted to excavate related transdisciplinary knowledge and skills and then implement four sub-activitys: analyzing composition of materials, designing technological process, detecting deoxidization effect, and testing bacterial colony amount. This transdisciplinary practice aimed to facilitate students’ formation of the concept of elements and transformation and develop their scientific attitudes as well. Moreover, it was purported to improve students’ higher-order thinking in analysis, evaluation, creation, and help them construct the crosscutting concept of cause and effect.

Taking selective compulsory 3 “alkyne” as example,centering on the solution of the problem of “removing a small amount of acetylene from industrial ethylene”,this paper designs teaching links such as “based on experience, putting forward the method of removing impurity”,“thinking about the new method of removing impurity according to the structure”,“evaluating the method of removing impurity through exploration”,“evaluating the new technology combined with discussion”,“summarizing and concluding to construct cognitive model”, guides students to start from the structure,to explore as the main line,to study and discuss the nature of acetylene,to clarify the use of acetylene,promotes the construction of students’ chemistry fundamental ideas such as classification ideas,particle ideas,change ideas,experiment ideas and chemical value ideas,and cultivates their innovative consciousness and innovative thinking.

Technology thought is a systematic and organized concept or theory of technology, which can guide students in designing, optimizing or evaluating industrial production schemes. In this study, the teaching design of “production of soda ash” is permeated with technical ideas, which aims to help students systematically construct the concept of technical ideas. Firstly, the tutorial case will be distributed before class, and students will consult the methods and chemical principles of soda ash production in advance; Secondly, by describing Solvay's alkali making method and Hou's alkali making method, the thinking model of industrial production is summarized; Then, analyze the historical development reasons of soda ash production in chronological order, and feel the value of technical thought; Finally, cut into the historical and global perspective, and carry out the education of patriotism and innovative spirit.

Based on the knowledge structure of the teaching unit and the analysis of its supporting competence development function, current teaching situation and the analysis of students, this paper sets the unit goals and the lesson goals for “the composition and structure of substances” and designs the teaching process for each lesson. Setting the directive big idea construction lesson “exploration of the composition of substances” as an example of the big-unit teaching practice, cultivates students’ awareness of recognizing the composition of substances from the macroscopic, microcosmic and macro-micro perspectives, develops their core competence, conducting practice and reflection.

This paper changed the sodium silicate solution concentration and reaction temperature respectively, recorded the growth of “chemical garden” over time, and used mobile phone macro photography technology to explore the factors influencing the experimental effect of “chemical garden” of various metal salts (CaCl₂, MnCl₂, FeCl₃, FeSO₄·7H₂O, CuSO₄·5H₂O, NiSO₄·6H₂O). The experimental results were also theoretically explained in conjunction with the “chemical garden” formation mechanism.

Using a device composed of constant pressure separatory funnel and a distillation flask, the reaction between saturated brine and calcium carbide is a common method for preparing acetylene in the laboratory. This experiment produces a large amount of paste-like Ca(OH)₂ precipitation, and there are problems such as too fast reaction rate, uncontrollable reaction process, unstable air flow, and foam rushing out with the gas to block the conduit. In this paper, 7 mm glass beads were mixed with calcium carbide in a drop-type gas generator, and 10% ammonium chloride solution was used as the reaction solution to prepare acetylene. By the method, the problems in the laboratory preparation of acetylene were solved and the efficiency of preparation of acetylene was improved.

The concept, classification, properties of projection and the establishment of three-plane projection system are briefly introduced. Use the orthographic projection method to convert the three-dimensional unit cell into a plane projection; With the help of the fourth sub-question of the 18th question of the 2022 Hunan Provincial General High School Academic Level Selective Examination, this paper discusses how to restore the plane projection to a three-dimensional unit cell. At the same time, the authors put forward their own opinions on the design of the test questions.

In 2002, a systematic reform called Curriculum for Excellence was launched in Scotland, this paper analyzed the Scottish senior secondary chemistry curriculum in terms of curriculum philosophy, curriculum objectives, content structure, form of expression, implementation and assessment. The main features of the curriculum were as follows: (1)The curriculum philosophy of senior secondary chemistry reflected the “skills orientation” and “people orientation” of the Curriculum for Excellence reform, and the nature of the curriculum emphasized that chemistry was the science of matter.(2)The objectives of the curriculum emphasized the development of interest and the integration of knowledge, skills and understanding. (3)The content of the curriculum showed continuity between years, with an emphasis on simplicity, topicality and practicality.(4) Teachers’ teaching philosophy changed from teaching subject content to teaching skills, with emphasis on student learning initiatives and suggestions for achieving curriculum objectives through practical activities and flexible curriculum organization.(5) Emphasis was placed on assessment to facilitate teaching and learning, and on the diversity of assessment subjects and assessment dimensions. The Scottish senior secondary chemistry curriculum framework provided ideas and content that could be drawn on for the reform of the senior secondary chemistry curriculum in China.

Ibuprofen is a best-selling over-the-counter drug worldwide. It is a non-steroidal anti-inflammatory drug, it has excellent anti-inflammatory, analgesic and antipyretic effect with less adverse reactions. By retrieving the literature, the paper reviews the development history of Ibuprofen from research and screening to clinical trials, the marketing experience from prescription drugs to over-the-counter drugs, and introduces its classic synthetic routes, and purifies the pedagogical values of its history and development.