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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,*,外研版,高一年级,(,必修,1),Module 5,英语课件,Introduction and,tongs,crucible,dissolve,solid/liquid/gas,balance,Bunsen burner,test tube,1.(,a)Water exists as a solid,a liquid and a gas.,(b)Water exists as a solid and a liquid only.,2.(a)When you heat a metal,it expands.,(b)When you heat a metal,it contracts.,Guess,listen and check the answer.,Listening,3.(a)Steel is a mixture of iron and other substances.,(b)Steel is a mixture of iron and oxygen.,4.(a)Two-thirds of the earths surface is water.,(b)50%,of the earths surface is water.,5.(a)The distance of the sun from the earth is 25,5000 kilometres.,(b)The distance of the sun from the earth is 150,500,500 kilometers.,6.(a)The earth is 4.6 million years old.,(b)The earth is 4.6 billion years old.,7.(a)The earth is twice as large as the moon.,(b)The earth is forty-nine times larger than the moon.,Put the words in pairs or groups.,contract air earth gas liquid,oxygen moon solid expand sun,1,2,3,4,air gas-oxygen,contract-expand,earth sun-moon,gas liquid-solid,1.liquid:,液体,2.expand:,vi.,使,.,膨胀,Metals,expand,when they are heated.,3.contract,vi.,收缩,Metals contract as they get cooler.,4.substance,n.,物质,5.mixture,n.,混合物,6.oxygen,氧气,7.electricity,n.,电,Answer the questions,.,Which of the above are natural?,Electricity,iron,some metals and air are natural.,2.Which are man-made?,Steel,some metals and glass are man-made.,electricity,iron metal steel air glass,3.Which can be both?,Electricity and some metals(,alloys,for example)can be man-made and occur naturally.,Listening and writing,You will hear a conversation in which a teacher helps a student do an experiment.Read the Aim below and predict the Result.,Aim:To find out if there is a change in,weight when the metal magnesium,burns in air.,Result:_.,Aim:_ _ _,To find out if theres a change in weight when magnesium burns in air.,Listen and complete the description of the scientific experiment.,Apparatus:_ _,Method:_ _ _ _ _ _ _,_,_,Magnesium,Bunsen burner,a balance,a crucible.,First,put the magnesium in the crucible.Then put the crucible on the balance and weigh it.Next,heat the magnesium.Light the Bunsen burner and,hole,the crucible over it.Finally weigh the magnesium again.,Result:_,Conclusion:_ _ _,It weighs a little more than before.,There is a change in weight when magnesium burns in air.,1.“Where do we go from here?”means _.A.What shall we do next?B.Is this the right way?,2.“Keep the noise down”means_.,A.Dont talk B.Talk quietly,Choose the correct meaning,.,3.“Youve got it”means _.A.Youve understood B.You have something,4.“Go ahead!”means _!A.Go away B.Begin,5.“Its your turn”means _.A.Youre next B.Turn round,Decide what the aim of the experiment is.,Listening and speaking on Page 95,The aim is to write a secret message.,Put the stages in the correct order.,1.,2.,3.,4.,b,squeeze lemon and pour the juice into a container,f,dip your pen into the juice,a,write your message on a piece of paper,g,blow on the paper to dry the lemon juice,5.,e,light a candle,6.,c,heat the paper in the candle flame,7.,d,the message appears when the,juice reacts with oxygen and,produces brown oxide,Homework,Preview Vocabulary on Page 46.,
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