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1、Post ReadingLead-inPassage APassage BImportant sentencesWhat can you see in these pictures?BB. aimD. methodA. resultC. conclusionDACPut these words in the correct order to describe the stages of a scientific experiment.Read the passage and choose the best title for it.The Different Uses of Metals Th
2、e Reaction of Metals The Reaction of Metals with Oxygen MetalsHeated in oxygenReaction with water or steamPotassiumBurn to form an oxideReacting with cold waterSodiumCalciumMagnesiumReacting with steamAluminiumZincIronReacts slowlyPartial reactionCopperPartial reactionNo reactionThe Reaction of Meta
3、lsRead the passage again. Answer these 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
4、 iron have a slow or fast reaction with steam? It has a slow reaction.5. Does copper react with water? No, it doesnt.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. Take iron used in _ eq
5、uipment for example, when _ in oxygen, it will react slowly. When it is put together with water or _, there will be a partial _. reaction reactelectricalheated steamRead the passage and fill in the table. Iron in dry airIron in air-free waterIron in ordinary waterStage A(starting experiment)cotton w
6、oolwater water Stage B(1 week later)Stage C (Result)nailswater Iron does not rust Iron does not rust Iron rusts 1. In the first part of the experiment, the _ is dry, not wet.2. It shows that iron _ when the air is dry.3. In the second part of the experiment, you must _ the water to make sure there i
7、s no _ in it.airdoes not rustboilairRead the passage again. Complete the sentences.4. You add _ to the water because this keeps _ out of it.5. It shows that _ does not rust in water that has no _ in it.some oilairnail airComplete the passage with proper words according to Passage A and B.It is hard
8、to think of a world without metals. Different metals have different uses, for example, iron can be used in _ equipment. But above all we should know whether it will _ under electricalreactdifferent conditions. Otherwise it will keep the equipment from working well. As we all know, if iron is heated
9、in oxygen, it will react slowly but will not form an _. oxideOn the other hand, if it is put together with water or _, there will be a _ reaction. Next lets do an _ to support the above. First, get a test tube filled with water and put it over the _ to _ for three minutes. steampartialexperimentBuns
10、en burnerboilThen put three or four clean nails in the water with some oil added to it and leave the tube for one week. What happens? The iron does not _ in air-free water. Another experiment, if you put the nails in the tube with the air in it for one week, then what happens? Iron rusts in _ water.
11、 rustordinary1. Which of the following reacts most easily with steam? A. Potassium. B. Iron. C. Magnesium. D. Calcium.Read Passage A (P44) and Passage B (P45) again and choose the best answers.2. Which of the following reacts least with water? A. Copper. B. Iron. C. Aluminium. D. Sodium.3. What can
12、we learn mainly from Passage B？ A. How iron reacts with air. B. How iron is made. C. How we can prevent iron from rusting. D. How iron reacts with steam.1. When we use metals, it is important to know how they react with different substances, for example, water and oxygen. = When we use metals, we sh
13、ould know how metals react with different substances, for example, water and oxygen, which is very important. 本句是一个复合句，本句是一个复合句，其中其中when引导时间引导时间状语从句；状语从句；在主句中，在主句中，it为形式主语，为形式主语，真正的主语是动词不定式短语真正的主语是动词不定式短语to know . substances，其中其中how . substances为为how引导的宾语从句，作引导的宾语从句，作know的宾语，的宾语， for example引出同位语，表示
14、举例。引出同位语，表示举例。2. Here is a table with the metals that react most at the top, and the metals that react least at the bottom.= A table is here. At the top of the table we can see the metals that react most and at the bottom of the table we can see metals that react least.本句使用了倒装语序。本句使用了倒装语序。句子的主语是句子的主语是a table，后面的，后面的with . bottom作定语修作定语修饰饰a table；两个；两个that都引导定语从句修都引导定语从句修饰饰the metals。句意句意: 这里有一个表格，反应最强烈的这里有一个表格，反应最强烈的金属在最上面金属在最上面, 反应最弱的在最下面。反应最弱的在最下面。Do exercises10-12 on page93.