Introduction.ppt

1、外研版 高一年级 (必修1) Module 5,Module 5 A Lesson in a Lab,Introduction,doing an experiment,tongs,crucible,dissolve,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

2、 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 ear

3、th is 25,5000 kilometers. (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

4、pairs or groups.,contract air earth gas liquid oxygen moon solid expand sun,air gas - oxygen,contract - expand,earth sun - moon,gas liquid - solid,1. liquid n. 液体,2. expand vi. 使.膨胀,3. contract vi. 收缩,4. substance n. 物质,5. mixture n. 混合物,6. oxygen n. 氧气,7. electricity n. 电,New words,Answer these que

5、stions.,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 natura

6、lly.,1. When you heat a metal, it expands. expand vi. 膨胀，扩张 e.g. The petals of many flowersexpandin the sunshine. 许多花的花瓣在阳光中绽放。,反义词 contract vi. 收缩 n. 合同 e.g. The heatcontractedthe woolen sweeter. 高温让羊毛衣缩小了。 Im undercontractto teach here for one year. 我按照聘约要在这里教一年书。,2. Steel is a mixture of iron and other substances. mixture n. 混合物 e.g. Themixtureof drinks made me feel bad. 我喝了混合饮料后很难受。 mix v. 混合 mix A with B,substance n. 物质 e.g. Beware of what you do