《第四单元 物质构成的奥秘》复习课教案--邓（The mystery of the composition of the fourth unit）.doc

《第四单元 物质构成的奥秘》复习课教案--邓（The mystery of the composition of the fourth unit） The mystery of the composition of the fourth unit Teaching content: ninth grade chemistry the mystery of the composition of the fourth element review Teaching objectives: (1) understanding the composition of atoms, the stratification of outer electron layers, and the concept of atomic mass (2) understand the concept of elements, the meaning of element symbols, and learn the proper writing and use of element symbols. Remember the common element symbols. (3) can find specified elements and other information about the element in the periodic table according to atomic number. (4) understand the process of ion formation. (5) understand the meaning of chemical formula, and remember some common elements and the valence of roots. A chemical formula can be used to describe the composition of certain substances, and the chemical formula can be used to apply the chemical formula. (6) to understand the meaning of relative molecular weight and to make use of relative atomic mass and relative molecular mass. Be able to read the label or content of a certain product label or label. Key points: Key points: composition of atoms, formation of ions, elements, element symbols and chemical formulas Difficult points: electron configuration, valence Teaching analysis: Although it is a recitation lesson, the content of this unit is abstract, far from the students life, the students element compound knowledge is not very much, the perceptual knowledge is insufficient, the student learns, the teacher teach all has certain difficulty. Study analysis: Recitation on to the front now, main is to review the knowledge of air, oxygen and water, the basic concepts and theory in chemistry is not system review, both curious aspect, students have difficulty in understanding at the same time use and side. Teaching philosophy: By guiding students to recall, analyze, and summarize, make the knowledge systematized and deepen the know