《a lesson in a lab》.ppt

* 1，revision 2，lead-in 3，listening 4，fast reading 5，careful reading 6.Language points 7，consolidation numbers fractions percentages decimals O(∩_∩)O Magnesium (镁) O(∩_∩)O Listen to the tape and choose the best title for passage A. The Different Uses of Metals The Reaction of Metals The Reaction of Metals with Oxygen O(∩_∩)O (1)The first sentence “It is hard to think of a world without metals.” will make us think . A．metals make up the world B．metals play a greatly important role in the world C．there would be no world if there were no metals D．it is difficult for us to live in the world of metals (2)According to the table，which metal is most suitable to make our daily kitchenware(厨房工具)? A．Zinc. B．Iron. C．Copper. D．Magnesium. O(∩_∩)O Read the passage again and answer the following questions: 1. Which of the metals in the table reacts the most with oxygen and water? Potassium, calcium and sodium. 2. What happens when you heat calcium in oxygen? It burns to form an oxide. 3. Which metals react with steam? Magnesium, aluminium and zinc. 4. Does iron have a slow or fast reaction with steam? It has a slow reaction. 5. Does copper react with water? No, it doesn’t. O(∩_∩)O 1，结论 2，反应 n. 3，阶段 4，部分的，局部的 K Ca Al Mg Al Zn Cu Fe think of 2，be used as 3，react with 4，put……in order 5，at the top/bottom 1，it is hard to think of a world without metals. It is impossible for a child to reach that apple. It is kind of you to show me the way. 2，Here is a table with the metals that react most at the top，and the metals that react least at the bottom. Here is the bus. Here you are. O(∩_∩)O Complete the passage with proper words according to passage A. Metals are very important, so when using them we should know how they _____ with different substances. ____iron used in ________ eq