2020同步外研英语必修1新突破（课件+讲义+精练）：Module 5.doc

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1、1有两种变化：化学变化和物理变化，那么你知道化学变化和物理变化的区别吗？Chemical Change and Physical ChangeThere are two kinds of changechemical change and physical change.In a chemical change, there is always a new substance formed.Breaking up water into hydrogen and oxygen is a chemical change.In each of the chemical change at least

2、 one new substance is formed.A change is not a chemical change if it doesnt form a new substance.Physical changes are very common, too.There are many examples.You can make a physical change by tearing a piece of paper into two, or by cutting a piece of iron with a lathe.Here the paper is still paper

3、, and the iron is still iron.Another way of making physical change is dissolving something in water.When you dissolve salt in water, the salt disappears.You may think that a new substance has been formed.But in fact there is no new substance.The salt is still salt.You can still taste it.So the disso

4、lving of anything is a physical change.When water freezes, the change is also a physical one.The water changes from liquid to solid.But it is still the same substance.That is why the freezing of anything is a physical change.2And people often tell the differences between a chemical change and a phys

5、ical change through some experiments.We should try to explore the magical science world by doing experiments by ourselves.阅读障碍词1hydrogen n氢气2tear v撕扯3lathe n车床4freeze v结冰；冷冻5magical adj.魔力的诱思导读根据短文内容，判断正误(T/F)1In a chemical change, there is always a new substance formed.(T)2Breaking up water into hy

6、drogen and oxygen is a physical change.(F)3Water changing from liquid to solid is a chemical change.(F) Section Warming Up, Prereading (b) in water that has no air in it (airfree water); (c) in ordinary water.Apparatus：3 clean iron nails; test tubes; test tube holder; cotton wool; oil; Bunsen burner

7、.目的：发现铁是否在下列状态下生锈：(a)在干燥的空气中；(b)在没有空气的水中(无空气水)；(c)在普通的水中。仪器：三颗洁净的铁钉、试管、试管夹、棉花、油、本生灯(即煤气灯)。助读讲解 To find out if iron rusts 是目的状语，其中 if 意为“是否” ，引导宾语从句。that has no air in it 是 that 引导的定语从句，修饰先行词water。Iron in dry airMethod(1)Put some iron nails at the bottom of a test tube.(2)Push some cotton wool down t

8、he tube.(3)Leave the tube for one week.ResultAfter one week, the nails have not rusted.ConclusionIron does not rust in dry air.Iron in airfree waterMethod(1)Halffill a test tube with water.(2)Boil(煮沸) the water for three minutes.(This makes sure there is no air in the water.)(3)Put two or three clea

9、n nails in the water.(4)Add some oil to the water.This will keep air out of the water.(5)Leave the tube for one week.铁在干燥的空气中方法(1)把若干铁钉置于试管底部；(2)顺着试管塞入一些棉花；6(3)把试管放置一周。结果一周后，铁钉未生锈。结论铁在干燥的空气中不生锈。铁在不含空气的水中方法(1)在试管中加一半水；(2)将水烧开保持 3 分钟(这样做可以保证水中无空气。)；(3)在水中放 23 颗洁净的铁钉；(4)在水中加些油，这样做可防止空气进入水；(5)把试管放置一周。助读

10、讲解 there is no air in the water 是省略了引导词 that 的宾语从句。ResultThe nails do not rust in the tube with airfree water.ConclusionIron does not rust in airfree water.Iron in ordinary waterMethod(l)Halffill a test tube with water and add two or three clean nails.(2)Leave the tube for one week.ResultThe nails r

11、ust in the tube with ordinary water.ConclusionIron rusts in ordinary water.结果铁在没有空气的水中未生锈。结论铁在没有空气的水中不生锈。铁在普通的水中方法7(1)在试管中加一半水，并在水中放 23 颗洁净的铁钉；(2)把试管放置一周。结果铁钉在装有普通水的试管中生锈。结论铁在普通的水中会生锈。第一步 速读了解文章主题和段落大意速读 P4445教材课文，回答下列问题1Read Passage A and choose the best title for it.AThe Different Uses of MetalsBT

12、he Reaction of MetalsCThe Reaction of Metals with OxygenDThe Reaction of Metals with Water答案 B2Read the subtitles in Passage B and answer what should be included in a description of an experiment.(1)Aim (2)Apparatus (3)Method (4)Result(5)Conclusion第二步 细读把握文章关键信息细读 P4445教材课文，选择最佳答案1The table in the p

13、assage is arranged in order of .Ametal kindsBreaction activitiesCvalues of metalDthe first letters of the words2According to the table, which metal is most suitable to make our daily kitchenware(厨房)?AZinc. BIron.CCopper. DMagnesium.83The experiment in Passage B shows us Ahow iron rusts with waterBir

14、on is quite easy to rustChow to prevent iron from rustingDhow iron reacts with air and with water4The purpose of these three experiments in Passage B is Ato find out how iron reacts with water and with airBto find out how important iron isCto find out how to do the experiment of irons reaction with

15、water and with airDto find out how to keep iron rustless答案 14 BCDD第三步 研读能力升华 接轨高考根据 P4445教材课文，在空白处填入 1 个适当的单词或括号内单词的正确形式Different metals have different uses.When we use metals，it is important 1.to know(know) how they react with 2.different(differ) substances.By doing some simple experiments，we can a

16、chieve the 3.following (follow) aims.Firstly，put them 4.in order according to the reaction.Secondly，find out if iron rusts in dry air，in airfree water and in ordinary water.In order to achieve the second aim，we need different pieces of 5.equipment(equip).6.Having made(make) full preparations，we can go to the different stages of the experiment.During each stage，relative methods should 7.be used(use)After that，we 8.will get(get) different results and make the conclusions 9.that iron does not rust in dry air and in airfree water 10.but it rusts in ordinary water.