《怎样加快溶解》教学设计（Teaching design of how to speed up dissolution）.doc

《怎样加快溶解》教学设计（Teaching design of how to speed up dissolution） Teaching design of how to speed up dissolution [author] Zou Lu / Wang Lujia [author] Zou Jihong, designer Wang Lujia, coach First, introduce new courses D: first of all, let me do a little experiment for my classmates. Please watch carefully. (experiment two) the size of the same empty beaker, which is equipped with the same amount of water, at the same time were two of the same size into Potassium Permanganate. What did you observe? Student: a beaker of Potassium Permanganate than another beaker Potassium Permanganate quickly dissolved. Teacher: how to make the slow dissolution of Potassium Permanganate dissolved faster? In this class we will study how to speed up the dissolution. Two. Teach new lessons Teacher: I was with a grain like Potassium Permanganate, put in so much water, how to make Potassium Permanganate dissolve faster? Whats your good idea? Raw [[1]]: grind it into powder. Students [, 2]: Potassium Permanganate in a hot. T: the students have come up with two ways to speed up the dissolution. Are these methods correct? Below, we use a scientific method of experiment to verify that your ideas are correct. First, take two empty beaker of the same size, and the teacher uses experimental methods to verify if hot water can accelerate dissolution. What should a teacher do now? Student: pour cold water into a beaker and pour hot water into another beaker. Teacher: how much should I pour? (pour the same amount) We should take what kind of Potassium Permanganate? (of the same size) How to get into the water? (simultaneous input) Whats the phenomenon? (hot water in Potassium Permanganate than dissolved in cold water fast) What does that mean? (explain that hot water can speed up dissolution.) Teacher: just now, the teacher proved by experiment that hot water can accelerate dissolution. [producer film] the experiment involved so many conditions. Which of these conditions are the same? What are the differ