英语自学基础知识第100期

O2 H2O H2The communication between teachers and students.The teacher pointed out that some of the students' writing:CO2, P2O5, Fe3O4, MnO2, CO, SO2...Well, we can also put these substances into one class, called oxide.Material family is rich and colorful, the use of classification method, can help us to better understand these substances. Subject 2 molecules and atomsTeaching target:Knowledge and skills:1, the particulate nature of matter, know that the composition of the material particles with small size, continuous movement, the basic characteristics of the interval, know that the molecules, atoms and other small particles are composed of particles;2, can be used to explain some of the simple life and experimental phenomena.Process and method:1, learning through observation of natural, experimental, and other ways to obtain information, learning to use the imagination analogy, analysis, reasoning, judgment, etc..2, can be in the teacher's inspiration and guidance through the form of cooperation with others, to have doubts and problems to explore the value of the research, the experimental observation and thinking combined; the results of the experimental observation, analysis can be used in the text, graphics and chemical language to express and exchange3, to understand the basic procedures and methods of scientific inquiry, to experience the fun of exploring activities, and gradually form a good learning habits and methods.Emotional attitude values:1, maintain and enhance the chemical phenomenon of curiosity and exploration, development of learning chemistry interest. Cultivate cooperation consciousness and diligent in thinking, rigorous and realistic scientific spirit, innovation and practice;2, the establishment of "the world is the material, the material can be divided into" the dialectical materialist view of understanding.Teaching emphasis: understanding molecules, atoms is an objective existence, is a matter of two kinds of particles. Characteristics of cognition.Cultivation of natural phenomena, experimental phenomenon of speculation, observation, analysis, communication, summary and other research capacity.Teaching difficulty: the material changes, the particle how to change?Class hours: 2 hoursTeaching process design:Teaching process to expand new teachingActivity and exploration: the particulate nature of matterReading ancient poetry, natural products, through the experimental study of interest:... the last day of the door, renmiantaohuaxiangyang red; people do not know where to go, peach blossom spring.Demonstration experiment: ammonia to make the "tree" stained with phenolphthalein red cotton.Question: a "water", "breeze blowing" blew "peach" smile?Excited: it seems that the peach is not only in the spring. Today is the peach blossom day, with your wisdom mind, clever hands, the red class this piece of "peach".Provide the products: cotton, water, ammonia, phenolphthalein, magentaTo guide the experimental verification of the hypothesis, the students should be prepared to predict the possibility and activitiesAsk: is the ammonia phenolphthalein red, but did not contact with ammonia phenolphthalein?Interest: ammonia "," No shadow kick "run" to cotton?What is the problem?It is concluded that matter is made up of tiny particles, molecules and atoms.Description: molecules, atoms are real.To show students a variety of molecules, atoms of the photo, to further illustrate the real existence of molecules, atoms.Activity and inquiry two: characteristics of particlesQuestion Thinking: water is also made of molecules, water molecules can not see, why can not see the water? Wet clothes on the water run where to go?The characteristics of a molecule, writing:1, the size and quality of the particles are very small.Description: the quality of the 1 water molecules is about 3 x kg 10-26A drop of water is about 1.67 * 1021 water molecules.Analogy: people often to "pick up the sesame, lost the watermelon" to describe things or substances such as sesame seed. But in the microscopic world, sesame seeds can not be compared with the molecular, sesame by numerous cells, the cell consists of numerous molecules, molecules and smaller particles of atoms. 50, 000 to 100 000 molecules a row up to a row, and only a long hair diameter.Application of knowledge transferQuestion discussion1, clothes drying in the sun, dry, why?2, passing through the flowers, why can smell the fragrance of flowers?Echo: to solve the water why the "run" of doubt.Writing: two, molecule and other particles are constantly moving, the higher the temperature is, the faster the speed of movement.Put forward the new problem: red syrup, sugar into the boiling water, sugar disappeared, the water in the cup is sweet. Can you explain it in a particle's opinion?Projection experiment content:。