让瘪乒乓球鼓起来（Let the flat table tennis bulge）

让瘪乒乓球鼓起来（Let the flat table tennis bulge） 让瘪乒乓球鼓起来(Let the flat table tennis bulge) Own collection Think it's useful So upload it to Baidu Share it with everyone! Let the flat table tennis bulge Zou Yuebin, Deng sai [teaching content] Hebei people's Publishing House "science" in the fourth grade primary school (in Chinese) Seventeenth lessons [design overview] In current science teaching Inquiry learning has become the main mode of primary school students' scientific activities But if we just put the "inquiry as the core" is understood as "let students do it yourself." Multi activity" Or let the students "feel" To experience" This understanding is undoubtedly superficial and one-sided Inquiry activity is only the external form of scientific inquiry And scientific thinking is the soul of inquiry Nature of inquiry It is the core of science learning This design explores the phenomenon of "flat table tennis bulging" Guide students to find the root of the phenomenon" Thus proved the scientific concept of gas expansion and contraction The main purpose is to explore the phenomenon Train students to ask questions Make conjectures and design experiments experimental verification Collate and analyze data Draw conclusions and apply the conclusions to explain the phenomena of life, such as scientific inquiry ability and rational thinking consciousness I. teaching objectives (1) to observe the phenomena of expansion and contraction of objects in life Put forward the problem to be studied (2) we can put forward our own hypothesis about the problem to be studied Design experiments under the guidance of Teachers (3) it can be proved that gas has the property of thermal expansion and contraction More examples of thermal expansion and cold contraction in production and life are given (4) cultivate students' comprehensive, thorough and rigorous sense of rational thinking; Two, teaching key points and difficulties Guide students to explore the nature of expansion and contraction of objects Train students' comprehensive, thorough and rigorous sense of rational thinking Three, teaching preparation 1, teachers use: hot water There are 1 broken and broken table tennis balls Beaker Flask balloon 2, students (1 in each group): dishcloth 1 bottles of hot water There are 1 broken and broken table tennis balls Plastic bottle 1 Small beaker (150ml) Small flask (150ml) balloon Great beaker (500ml) Four, teaching process (1) creating situations and asking questions; 1, the teacher usually likes to play table tennis But in the event, often appear to table tennis trample deflated situation condition (have shown flat table tennis) the teacher knows all love brains Who can help the teacher to think of a job? French drum up this flat table tennis ball (students raised their hands to speak) 2, then you can do your method to the students to see? put a flat table into hot water A flat table tennis drum is bulging.) 3, everybody see With his help, the teacher drums up the shrunken table tennis Do you have any questions about this phenomenon? Ask the question: who is after the trouble? Drum up the ball? 4, guide students to analyze the objects involved in the test (hot water, ball) 5, further guidance, in addition to these two And the neglected air [designs] there is a lot of fragmentary knowledge and experience in the student's mind It is possible to try to explain some of these issues based on these accumulations Teachers to guide students to make reasonable and logical speculation: ping-pong ball drum up with hot water, air, the ball itself may have relationship This will help to cultivate students' rational thinking consciousness (two) according to life, explore the problem 1, preliminary inquiry The bulb bulged with hot water 1 hypothesis: the bulb bulged with hot water 2 experiment: put flat table tennis in hot water and cold water respectively 3 Summary: deflated table tennis bulge in hot water There is no change in cold water It's about hot water (preliminary conclusion) Question 4: is it only about hot water? 2 and two inquiry Proof that the heat expands in the gas to make the ball swell 1 suppose that the heat expands in the gas and makes the ball swell The 2 students have their own plans Division I A, with eyes flat, heated after table tennis It won't drum up again B, without eyes, after table tennis, heated by gas The ball will blow up [design intention] enable students to rely on life Link the scientific knowledge you want to learn with your real life Realize the relation between science and life At the same time, put forward a reasonable conjecture about the existing problems Let the students guess is not groundless, baseless conjecture It is reasonable, it can explain the conjecture of life Play the divergent thinking and innovative ability of students The teacher showed the experiment requirements: A, in groups Work well within the group B, the experimental records should be done in the process C, attention should be paid to safety in the experiment 3 feedback: students according to custom program Hands-on experiment Report the results of the experiment 4 Summary: the volume of the gas inside the table tennis is enlarged after being heated The volume shrinks after cold [design intention] teachers should value students' feelings and experiences In the whole inquiry process, we have adopted the independent and open inquiry form Guide students to explain their ideas and opinions to others Listen to other people's opinions Treat people with good criticism Look at your point of view In order to obtain more correct knowledge At the same time, their listening ability has been cultivated In this way, in cooperation and communication Let students play their own special skills In cooperation and communication Play the main role of students So that students complete the difficult task of independent difficult to complete Achievement sharing Let the students realize the joy of success (three) probe into; Refining concept 1, questioned: gas heating expansion What's the result of being cold? 2 experiment: first put the balloon in the plastic bottle Wrap the balloon over the bottle Also prepare a glass of hot water cup of cold water Then put the plastic bottle in hot water You'll see balloons pop out of plastic bottles Put the plastic bottle in cold water The balloon will be retracted into the plastic bottle 3. Conclusion: This is the nature of the gas we are going to study today Gases expand when they are heated The cold volume shrinks The nature of the gas we call is the nature of the expansion and contraction of the gas (the teacher writes on the blackboard at the same time) [design intention] in science teaching Concepts are not given to students in advance But the students are in the activity On the basis of one's own experience and perception, it is summed up Ad locum Students experience conflicting conflicts Experiencing the "brain storming" again and again" Go through logical reasoning again and again They make rational thinking on the basis of intuitive perception Students' thinking is comprehensive, thorough and rigorous The rational thinking consciousness has been fully cultivated (four) contact life and expand it In our life, you have seen what gas expansion and contraction of the phenomenon? Say And make explanations based on what we learned today (living) a bicycle that is full of air and exposed to the sun Will happen tube "blasting" phenomenon, etc. [design intent] at the end of the lesson, extend knowledge to life Let students realize that scientific knowledge comes from life Serve the purpose of life For students in the future of Science in the better play their own expertise to provide a platform for the display Blackboard design: Let the flat table tennis bulge Hot water, air, table tennis (volume expansion) (drum) Cold water air table tennis (volume shrinkage) (deflated) Thermal expansion and contraction Leading the theme Layered solutions under the guidance of My school teacher Deng Sai Zou Yuebin, written by the fifth grade science teaching design "interesting changes: let the flat table tennis to summon" won the "2008 Dongguan city primary school science teaching excellence design award two prize This primary school science excellent teaching design selection received 199 teaching design After the review team seriously reviewed Select 100 award-winning teaching designs Among them, the first prize 4 Two prizes, 36 articles Three prizes, 60 articles The results of the review were publicized in July 5, 2009 The two prize of Dongguan science design competition in 2008 One