Research On High School Chemistry Learning Progressions For "Chemical Bond"

Since the 21 st century,education in all countries has faced a lot of knowledge.Students can't master all the knowledge in a limited time.To solve this problem,"integration" has become the core concept of curriculum reform in the basic education stage.The vertical integration,that is,the learning progressions has become the focus of education research.Organizing teaching around learning is not only conducive to the formation of students' knowledge framework,but also promotes the two-way migration of students' horizontal and vertical knowledge.It also helps to promote the development of students' core literacy.Therefore,the advanced learning of the core concepts is built.The teaching of frontline teachers is of great significance.The content of "chemical bond" is the focus of high school chemistry.The knowledge itself is relatively abstract,and students' understanding is more difficult.Therefore,this article uses "chemical bond" as the content carrier.Under the guidance of the first-line teachers,it sorts and finally determines the core concept under the theme of "chemical bond".According to the curriculum standards and textbooks,summarize the learning progressions hypothesis of “chemical bond”,and conduct a questionnaire survey on students in grade two and three in senior high school in Chaoyang City.Through the above research,the advanced hypothesis is adjusted,and finally the four levels of “chemical bond” content from low to high are obtained.The specific advanced expression is: Level 1: Know the interaction between the particles that make up the substance(low level);Level 2: Understand the concept of chemical bonds and the distinction between ionic and covalent bonds can illustrate the formation of ionic and covalent compounds,knowing that energy changes are related to chemical bond cleavage and formation(intermediate level);Level 3: Can explain the properties of ionic compounds according to the characteristics of ionic bonds and lattice energy.The type of covalent bond and the meaning of bond parameters can be used to explain the properties of compounds,and the characteristics of metal bonds are known.Related to certain properties of metals(intermediate level);Level 4: Use various types of forces such as chemical bonds,intermolecular forces,hydrogen bonds,etc.to interpret and judge the properties and changes of substances,and to combine multiple forces to solve comprehensive problems(high level).Based on the results of this study,the author proposes three suggestions for the teaching of frontline teachers:(1)teachers should define the core concepts in the teaching process;(1)teachers should make effective use of learning in the teaching process;(3)teachers in teaching In the process,we must pay attention to the core concepts and the effective combination of learning.