Using Flow Map structure analysis method, this paper mainly focused on the measurement and comparison of the content of “ionic reaction” in three senior high school chemistry textbooks including new textbook of people's education press, new textbook of Shandong science and technology press and old textbook of people's education press. It was found that the new textbooks changed in the introduction, engagement and organization of core concepts. The new textbook of people's education press presented the knowledge structure system of “ionic reaction” with richer level, more reasonable organization and fuller meaning and paid more attention to the application of situational reasoning and interpretive representation strategy, creating reasonable situations, containing problems in situations and forming concepts in the process of solving problems. The new textbook of Shandong science and technology press focused on the triple representation of macro-micro-symbol, highlighting the representation strategy of comparison, and showing students the multiple paths and dimensions to grasp the concept connotation and application.

Chemistry textbook is an important carrier and resource platform for developing students' core literacy in chemistry in high school. The general high school chemistry compulsory textbook published by people's education press is used as an analytical text, which is based on the General High School Chemistry Curriculum Standard (2017 Edition). This paper focuses on the analysis of its presentation from the perspective of column system, image system and exercise system. The specific characteristics are as follows:column system strengthens functionality, image system highlights intuitiveness, exercise system embodies pertinence,situationality and openness,in order to play an active role in effectively using of textbooks and developing chemistry core literacy for chemistry teachers in high school.

In view of the contradictions and deficiencies in relevant literatures, the phenomena in titration of Na₂S with FeCl₃ were further explored, taking this as the material, the test questions of senior three were made, and the test questions design strategy oriented by scientific inquiry literacy was expounded.

What are the basic requirements for the examination and teaching of model literacy, and what are the main aspects of the evaluation of model literacy in the college entrance examination? From the perspective of the digital experiment (image) of model literacy, this paper ponders and sorts out the classification, the concrete embodiment and the above-mentioned problems, and analyzes the problems of the students in the light of the relevant practical teaching.

Starting from the complaint of white shirt, this paper creates a real life situation, explores the formation and characteristics of solution, emulsion and suspension in the order of dissolution and emulsification knowledge, so as to let students know the principle and application of dissolution and emulsification phenomenon, and solve some simple practical problems related to it. The idea that chemical knowledge comes from life and serves life is realized.

Based on the concept of core literacy of chemistry, this lesson takes the macro experimental data and phenomena as the starting point to introduce the nature and composition of molecules. On this basis, it focuses on how molecules constitute the micro model of substances, and then uses the model to explain the macro problems of the nature, changes and types of substances, and in this process, it cultivates the core literacy of chemistry.

Combined with the characteristics and teaching status of alkanes, the teaching design was carried out by enriching situational materials and innovating experimental design. In the actual teaching, it stimulates students' interest in learning, enriches perceptual cognition, improves the construction of understanding, and develops the core literacy of students' macro identification and micro analysis, evidence reasoning and model cognition, scientific inquiry and innovation consciousness.

Crosscutting concept in science curriculum embodies the idea of integration. It's an important topic to promote understanding of crosscutting concepts in divided curriculum. As a crosscutting concept, energy is considered as the capacity to do work at both macro and micro worlds. Cognitive frameworks are able to deepen students' understanding of energy concept. Three cognitive frameworks (four characteristics of energy, tracing energy flow, a new framework based on the theory of cognitive development) are introduced in this paper. A good cognitive framework should combine discipline and cognition. Teachers are suggested to create more daily living contexts, to design meaningful tasks of variety types. Teachers should guide students to construct appropriate cognitive frameworks, and meanwhile pay close attention to stages and directions of understanding of energy.

Flanders' interaction analysis system can quantify the language behavior in classroom teaching then diagnose classroom teaching objectively and scientifically. This study took a normal chemistry case of junior high school as an example to conduct a comprehensive analysis and evaluation based on Flanders' interaction analysis system and teachers' self-evaluation, from four aspects: teaching goals, teaching content, teaching process and teaching effect. And according to the evaluation results, the feasible and effective strategies were put forward for the establishment of teaching goals, effective questioning, the construction of scientific classroom language structure and the implementation of experimental exploration, so as to provide the fundamental basis for young teachers to promote personal professional development through teaching practice.

The cognitive diagnosis of “redox reactions” in senior high school was carried out by using Rule Space Model as a cognitive diagnostic analysis tool. It is found that the six cognitive attributes of “redox reactions” in senior high school are divided reasonably, the classification proportion of reaction mode is 97.40%, and the knowledge state of the subjects can be clustered into 13 kinds, of which the proportion of 6 kinds of knowledge state is higher. There are differences in students' mastery of different attributes, in which the mastery rate of attributes C1 and C2 is more than 97%, while the mastery rate of attribute C6 (calculation of redox reactions) is only 31.47%, which needs to be remedied. The results of cognitive diagnosis, which can be classified and personalized, are helpful for teachers to carry out scientific and reasonable remedial teaching.

“Molecule and atom” is the content of the third unit of the ninth grade chemistry, and it is the enlightenment for students to study the composition of chemical substances in junior high school. This paper discussed the sequences of knowledge evolution, textbook contents and students' learning of “molecules and atoms”. What's more, based on the principle of the combination of three sequences, the methods and suggestions in teaching are proposed.

Based on the principles of authoritativeness, pertinence and readability, the paper took the “isolation and testing of iodine elements in laminaria japonica” as an example, relevant and qualified literature were selected to create contexts for further teaching. During reading and analyzing literature, students realized the value of them. Literature guided students in various aspects such as laminaria japonica pretreatment, selection of oxidants, purification and identification of iodine. It has been proved that literature contribute to broaden the horizons of students and inspire their interest a lot.

This study combined with practical investigation, on the basis of summarizing the connotation of humanistic quality, proposed the three-dimensional model of chemical humanistic quality, namely “knowledge” “faith” and “action”. “Knowledge” includes the humanistic knowledge and value inheritance, “faith” includes the consciousness of innovation and the spirit of inquiry, and “action” includes the healthy life and social responsibility. This paper designed research tools based on the model, investigated 272 high school students in Beijing ordinary high school and interviewed 68 students, found that the cultivation of students' humanities accomplishment, especially the knowledge of humanities, the cultivation of innovative consciousness, social responsibility, to be strengthened. Based on this, the corresponding teaching countermeasures were proposed.

In the application of salt hydrolysis, the water purification effect of aluminum salt and iron salt involves colloid formation and adsorption coagulation. It is a comprehensive and complex chemical problem. For the development of students' chemistry, this paper uses the color recognition software. The semi-quantitative relationship between density (V) value and soil content in turbid liquid of yellow soil, constructs an experimental method based on classroom teaching to quickly determine the water purification effect of industrial water purifying agent, and provides real situation and inquiry case for the specific application of salt hydrolysis in chemistry classroom teaching.

In order to improve students' ability in experimental teaching, Brain Hand et al. developed a scientific writing tool for experimental teaching, which was Science Writing Heuristic(SWH) based on scientific language and classroom inquiry. Through “problem, method, observation, opinion, evidence, judgment, change”, SWH makes the scientific content connect language activities to stimulate students to participate in the argument and understand the science. In the experimental teaching, the application of SWH has been influenced by a variety of factors. SWH's research “from frame construction to specific implementation” and “from theory to practice” will inspire the development of other teaching or learning tools.

The essence of the reaction was revealed by measuring the voltage change of the reaction between acetaldehyde and the new copper hydroxide by electrochemical method with the help of hand-held technology. The role of NaOH in the reaction was explored by the idea of controlling variables. The composition of the reaction product of acetaldehyde and the new copper hydroxide was further explored by combining the knowledge of relevant literature and experimental comparison.

Based on the STSE education concept, this paper contacted the real situation in Kuitun area of Xinjiang, designed a comprehensive experiment, and made students explore the fluoride ion in high-fluorine groundwater by determining the subject, formulating the plan, implementing the plan and summarizing the subject, so that students could master the process of scientific inquiry and methods to enhance the ability to develop integrated projects using chemistry knowledge and experimental methods.

This paper designed an experiment of ethylene production by dehydration in a laboratory, which is simple in design and operation, obvious in phenomenon, high in safety, efficiency and yield. Besides, this paper also designed an orthogonal experiment based on the new production with the amount of ethanol, reaction heat, the distance between ethanol and flame as variables, to explore the best demonstration experiment effect of the new scheme of ethylene procluction by dethydration in laboratory while yield was ensured.

There are complicated relations among concentrations, pressures, amount of substance and conversion ratios for complex chemical equilibrium, which bring great difficulties to solve these problems. This paper presents a general method of five steps which includes listing, assuming unknown number, calculating pressures, calculating equilibrium constants and solving to solve problems. Two problems related to chemical equilibrium appeared in recent years' Chemical Olympiad are carefully analyzed using this method with application of CASIO calculator's unique function.

The Latest High School Chemistry Textbook published by the Commercial Press in 1903 is theoretical, practical, and operational. It is the earliest high school chemistry textbook in China and is translated by XIE Hong-Lai from the Steel's Popular Chemistry in the United States. This book analyzes the background, content system, value orientation, formal style, and compiled language of the book, and clarifies its important historical significance for the development of chemistry education in the late Qing Dynasty and the evolution of modern chemistry textbooks.

According to the research on the development of the concept of iodine, Gay-Lussac first proposed the concept of iodine in 1813, but at that time the concept of iodine and elemental iodine was not clearly defined. Until Dalton's atomism, which gave iodine a new meaning, it was the first time that iodine atoms and iodine elements were combined. In the 1940 s, the discovery of iodine isotope perfected the concept of iodine element and formed the concept of modern iodine element. In chemistry education, students must realize that the development history of iodine concept is the development history of element concept, as well as the development history of scientific thought and scientific method.