外研版英语必修2module2_reading课件.ppt

1、,Module 5 A Lesson in a Lab,Potassium 英 ptsim （钾）,Lets get to know some metals,Sodium sdim (钠),calcium klsim (钙),Magnesium mgni:zim (镁),Aluminum lminm （铝）,zinc（锌）,iron（铁）,copper （铜）,Read the passage as quickly as you can and choose the best title for it .,The Different Uses of Metals The Reaction of

2、 Metals The Reaction of Metals with Oxygen,Passage A,Read the passage again and answer the questions in Activity 3:,1. Which of the metals in the table reacts 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 me

3、tals 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 .,Passage B,Whats happening to the nail in the pictures?,What is the correct order to describe the stages of a scientific

4、 experiment?,aim,method,result,conclusion,Look at the pictures. Do you know the names of the equipment？,test tube,crucible,tongs,balance,Bunsen burner,Read the passage carefully and fill the chart on page 45.,Passage B,Read the passage and complete the chart.,cotton wool,nails,The nails do not rust.

5、,water,The nails do not rust.,water,water,The nails rust.,Read the passage again and complete the sentences on page 46.,Passage B,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 wate

6、r to make sure there is no _ in it .,air,does not rust,boil,air,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 oil,air,nail,air,It is hard to think of a world without metals. Different metals have different metals have d

7、ifferent uses, for example, iron can be used in _ equipment. But above all we should know whether it will _ under different conditions otherwise it will keep the equipment from working well. As we all know, if iron is heated in oxygen, it will react slowly but will not form an _. On the other hand ,

8、 if it is put together with water or _, there will 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 . Then put three or four clean nails in the water with some oil added to it and leave the tube for one week

9、 . 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 .,electrical,react,oxide,steam,partial,experiment,bunsen burner,boil,rust,ordinary,Homework,Remember all the new wo

10、rds. Read passage A&B, try to retell them by your own words.,When we use metals, it is important to know how they react with different substances, for example, water and oxygen. 当我们使用金属时，要了解金属和不同的物质- 例如水和氧气如何发生反应，这一点很重要。 react to 对作出反应；起反应 react with 与发生化学反应 How did they react to your suggestion? Ir

11、on reacts with water and air.,Add some oil to the water. 向水中加一些油。 add.to. 向中加入 add to 增加 Add a new page to history. The bad weather added to our difficulties.,Read about an incident during a chemistry lesson and choose the best summary.,Reading on P93,A student didnt follow the instructions carefull

12、y . He took the wrong liquid from the cupboard and nearly poisoned the class . 2.The chemistry teacher was demonstrating an experiment when she heated a poisonous liquid . There was so much smoke that the students had to leave the room .,3. A student was doing a chemistry experiment when he accident

13、ally heated the wrong liquid and caused an incident in the laboratory .,Read the passage again and answer the questions :,1. What substances were they using ? Baking soda and hydrochloric acid 2. What substances were the students making ? Salt,3. How can they make the reaction quicker ? By making th

14、e mixture hotter. 4. What mistakes did Paul make? He used the wrong liquid .,1. Why did he make the mistake ? Because there was no label on the bottle . 2. What happened when Paul heated the liquid ? It formed a thick cloud of white gas.,3. Why did the teacher send the students out of the room? Beca

15、use the liquid was acrylamide and the gas was poisonous . 4. What lesson did the incident teach the students and the teacher? Never to leave a bottle without a label in the chemistry lad .,Learn the new words by heart. Read the passage A and B and try to retell it .,Assignments for you,(language poi

16、nts),镜头再现,The earth is forty-nine times larger than the moon . The more books I read, the more information I learn.,上面两个句子中重点强调的是比较级。这一语法现象我们在初中已学过,现在我们对这一语法进行总结。,三种比较句型的转换： 1) A+be+four times +比较级than +B 2) A+be+four times+as+adj/adv+as +B 3) A+be+four times +the +N of B,The well is four times deep

17、er than that one. = The well is four times as deep as that one. =The well is four times the depth of that one.,哪一些词可以来修饰比较级？ 1) much/rather/a bit/a little/a lot/a great deal/any/ 2) 倍数、分数、百分数、小数 3) 一些名词,The weather in winter in Beijing is much colder than that in Shanghai. This book is 50% percent m

18、ore expensive than that one. John is a head taller than I.,一个固定句型: the +比较级, the +比较级,The more often you stay with him, the better you will find he is. The faster we walk, the more likely we will be to catch the bus. The more, the better. The sooner, the better.,1. That doesnt sound very frightening

19、, Paul. Ive seen _. What did you like most about the film ? A. better B. worse C. best D. worst,Choose the best,2. The number of people present at the concert was _than expected. There were many tickets left. A. much smaller B. much more C. much larger D. many more,3. He speaks English well indeed,

20、but, of course , not_a native speaker. A. as fluent as B. more fluent than C. so fluently as D. much fluently than 4. It is reported that the United States uses _energy as the whole of Europe. A. as twice B. twice much C. twice much as D. twice as much,5. Mary kept weighing herself to see how much _

21、she was getting. A. heavier B. heavy C. the heavier D. the heavier,6. The house rent is expensive . Ive got about half the space I had at home and Im paying _here. A. as three times much B. as much three times C. much as three times D. three times as much,7. Our neighbour has_ ours. A. as a big hous

22、e as B. as big a house as C. the same big house as D. a house the same big as,8. As far as I am concerned, education is about learning and the more you learn, _. A. the more for life are you equipped B. the more equipped for life you are C. the more life you are equipped for D. you are equipped the

23、more life,镜头再现,The reaction of metals with these substances can be put in order . In order /in order /in the order of /out of order,1. 在图书馆，图书通常是按作者姓氏的第一个字母顺序排列的。 In the library, books are usually put in the order of the first letter of the writers surname . 2. 他桌子上的书摆放整齐有序。 The books on his desk ar

24、e in order (orderly).,将下列句子翻译成英语,3. 请按照正确的顺序将下列单词排列。 Please put the following words in the correct order . 4. 我们这次是按照年龄顺序而不是按照身高站队。 This time we stood in line in the order of age instead of in the order of height .,镜头再现,Half-fill a test tube with water . fill with = be full of 将下列句子翻译成英语 1. 请将这个瓶子装满

25、水。 Please fill the bottle with water . 2. 听到母亲的话,他顿时充满了自信。 Hearing mothers words , he was filled with confidence immediately.,3. 他满脑子都是知识, 但他不是一个书呆子。 His brain is filled with knowledge but he is not a bookworm . 4. 看到这个恐怖电影,这个女孩心中充满了恐惧。 Seeing such a frightening film, the girl was filled with horror.,镜头再现,Add some oil to the water . addto/add to /addup/add up to 1. 毫无疑问这是火上浇油。 There is no doubt that it is like adding oil to the fire . 2. 这些新建的公园增添了这个城市的美丽。 These newly-built gardens add to the beauty of the city .,3. 1到100 加起来总计是5050。 1,2,3.and 100 adds up to 5050. 4. 把这些数