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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Welcome to my class!,Guessing game,This person is very famous.I think everybody in our class knows this person.,Yes,No,This person often,do,es,experiment,s,.,This person often uses the following,apparatus,:,This person is very,strict,with you.,Who is the person?,METALS,Read the passage as quickly as you can and choose the best title for it.,A.The Different Uses of Metals,B.The,Reaction,of Metals,C.The Reaction of Metals with Oxygen,Passage A,react,:,if a chemical substance reacts,it changes when it is mixed with another chemical substance.,Read the passage again and answer the questions in Activity 3:,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 b,urn,s 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 doesnt.,We know that some of the metals are very active.They can even react with cold water.Sometimes,these reactions are useful in our life and we can make use of them.But sometimes,they are harmful.Here is an example:,How can we stop it from rusting?,The bike has,rust,ed.,The bike is,rusty,.,We can see,rust,on the bike.,Read the passage and fill in the chart.,Passage B,Iron in dry air,Iron in air-free water,Iron in ordinary water,Stage A,(starting experiment),cotton,wool,water,water,What do we put in the tubes?,Stage B,(1 week later),nails,water,Nails do,not rust.,Nails,do,not rust.,Nails rust.,Stage C,(Result),Conclusion:,Iron doesnt in or,while it in,Iron in dry air,Iron in air-free water,Iron in ordinary water,How can we stop our bike from rusting?,Homework,Try to describe a simple science experiment you did in Junior high school.Show us next time.,
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