5E instructional model was widely used in international science teaching, and it was an important teaching mode of conceptual change and inquiry teaching which used widely in educational research and practice in basic education in our country. 5E instructional model was a kind of learning ring mode based on constructivism, which mainly including 5 parts:engagement, exploration, explanation, elaboration, evaluation. Each stage had its dedicated teaching strategies. This study systematically reviewed the origin, connotation and characteristics of 5E instructional model, deeply analyzed the existing practice case of 5E instructional mode in our country, described the practice application situation and existing problems of 5E instructional mode, and put forward positive suggestions for improvement of inquiry teaching in our country. By explaining the evolution and research progress of 5E instructional model, this paper hoped to describe the direction and content of the study in the future.

Through the teaching case of "iron transformation", this paper discussed the improvement of curriculum design and the development of inquiry-based teaching, and constructed the implementation strategies for the infiltration of chemical ideas in the teaching of element and compound under the new curriculum standard.

Taking the teaching design and implementation of "primary battery" as an example, this paper explored the application of flipped classroom in high school chemistry teaching from the following four aspects:the choice of teaching contents, the production of micro video and learning plan, the analysis and feedback of learning plan and the classroom teaching implementation. The flipped classroom teaching mode had advantages in teaching organization based on the learning situation and cultivating students' high order thinking ability. At the same time, teachers and students had to face the challenges when applying the flipped classroom teaching mode.

This paper constructed classroom observation system composed of 4 dimensions such as chemistry preconception, teachers' teaching method of and questioning, the degree of students' classroom participation and the reached extent of learning goal. This system could observe and count classroom behaviors, and evaluate the effectiveness of transformation strategies derived from teaching practice for scientific preconception.

Based on the curriculum standards and examination syllabus, this paper explored how to integrate the scattered knowledge throughout the textbooks, how to effectively use the unit integrity teaching thought to review modular knowledge, and how to solve the questions about organic integrated inference and so on.

This study selected the novice chemistry teachers with one year teaching experiences as object, investigated their understanding of effective teaching, and found that:39% of the novice chemistry teachers could only achieve one dimension of the characteristics of effective teaching; only 8% of the novice chemistry teachers could achieve four dimensions or more, and 64% of the novice chemistry teachers could realize the characteristics of "reasonable design and implementation of teaching objectives". The novice chemistry teachers' understanding of effective teaching strategies mainly focused on "effective teaching design (50%)" and "outstanding students' subject position (53%)". The novice chemistry teachers' understanding of influence factors of effective teaching mainly concentrated on "teachers' professional literacy" and "students' levels of ability", rarely mentioned "students' preview and review after class" or other objective factors, and the novice chemistry teachers had narrow understanding of effective teaching misunderstanding. This paper also put forward some suggestions for novice chemistry teachers and educational institutions.

This paper explained the definition of informational teaching tool based on the particulate concept, information expression and its application of various dimensions of chemical particulates in teaching. Studies showed that teachers should rely on students' life experience, start from chemical experiment, and accord to the different dimensions of the presence of particulates, use information tool to design teaching in the process of helping junior high school students to construct particulate concept, and obtained good teaching effect.

In order to help students to build a general knowledge of the acid-base property of salt solution, this paper designed an experimental lesson which contained some modern information technologies. First, a micro-video made by the software ‘Camtasia Studio’ was shown in the class, then the students imitated to guess the acid-base property of these two solutions and design experiments to verify their guesses. During this period, the teacher took photos of the students doing experiments with an ipad and showed those pictures with the computer projection by AirPlayer, an application from iTools at the appropriate time, so as to promote a further analysis. The use of micro-video shortened the experimentation, increased the classroom efficiency and was also convenient for students to review this lesson. Taking candid photographs and real-time projection helped to have a distinct review of the experiment by freeze-framing and magnifying the experimental phenomena. Students could also realize the importance of solution selection and experience an ordinary process of scientific inquiry by designing and practicing the experiment on their own.

This paper got the value of L*、a*、b* of the different concentration of transparent colored solutions by using CMOS sensor of Android smart mobile phone and Android mobile phone software Color Grab, introduced the corresponding data into Excel to get the corresponding value of chromatism, obtained the concentration of the solution by establishing the numerical relationship between value of chromatism and concentration, and measuring value of chromatism of the transparent colored solution by the smart mobile phone. After calibration, the system no longer needed standard solution.

This paper designed rusting experiment of nails using potassium thiocyanate as indicator to prove the presence of ferric ion, and thus students could understand rusting experiment of nails more deeply and clearly.

This paper used digital hand-held technology to determine the change of CO₂ concentration and temperature in the process of candle extinguished, and got the related curves. Combined with the macroscopic experimental phenomena and the change of curve, this study analyzed and verified the cause of the candle unconventional extinguished.

N and Cl have the same L. Pauling electronegativity, so their non-metallic should be the same, but the atomic radii, ionization energies, electron affinities and other electronegativity of them are different, reflecting the difference in their non-metallic. This paper compared the non-metallic of N and Cl in nitrogen trichloride, which indicated that the non-metallic comparison of N and Cl should be based on dynamic electronegativity.