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1、Module 5 A Lesson in a Lab,词海拾贝,难句剖析,理解诱思,Life is full of surprising changes.Here are two changes for you to explore. Chemical Change and Physical Change There are two kinds of changes in our daily lifethe chemical change and the physical change. In a chemical change,there is always a new substance
2、formed.Breaking up water into hydrogen1 and oxygen is a chemical change.In each of the chemical change at least one new substance is formed.A change is not a chemical change if it doesnt form a new substance.,词海拾贝,难句剖析,理解诱思,Physical changes are very common,too.There are many examples.You can make a
3、physical change by tearing2 a piece of paper into two,or by cutting a piece of iron with a lathe3.Here the paper is still paper,and the iron is still iron. Another way of making a physical change is dissolving something in water.When you dissolve salt in water,the salt disappears.You may think that
4、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 dissolving of something is usually a physical change.,词海拾贝,难句剖析,理解诱思,When water freezes,the change is also a physical one.The water changes from liquid to solid.But it is still
5、the same substance.That is why the freezing of anything is a physical change. And people often tell the differences between a chemical change and a physical change through some experiments.In this module,lets explore4 the magical science world by doing experiments by ourselves.,词海拾贝,难句剖析,理解诱思,译文: 化学
6、变化和物理变化 日常生活中存在两种变化,它们是化学变化和物理变化。,词海拾贝,难句剖析,理解诱思,在化学变化中总是有新的物质生成。把水分解成氢气和氧气是一种化学变化。在每一次的化学变化中至少有一种新的物质生成。没有新的物质生成的变化不是化学变化。 物理变化也很常见。有很多例子(可以说明这个问题)。你可以通过把一张纸撕成两部 分或用机床切割铁块来产生物理变化。在这个变化中纸仍然是纸,铁块仍然是铁块。 另一种产生物理变化的方法是在水中溶解某种物质。当你把盐溶解在水中时,盐不见了。你或许会认为有一种新的物质生成了。但事实上并没有新物质生成。盐还是盐。你仍然能够尝到它。所以溶解通常属于物理变化。,词海
7、拾贝,难句剖析,理解诱思,当水结冰时,这种变化也是物理变化。只不过水从液态变成了固态,但它仍然是同一种物质。那就是为什么所有的凝固都是物理变化。 人们常常通过实验来区分化学变化和物理变化。在本模块中,让我们通过自己做实验来探索神奇的科学世界吧。,词海拾贝,难句剖析,理解诱思,1.substance sbsts n.物质,东西 2.hydrogen haIdrdn n.氢气 3.lathe leI n.车床 4.explore Ikspl v.探测,探索,词海拾贝,难句剖析,理解诱思,You can make a physical change by tearing a piece of pap
8、er into two,or by cutting a piece of iron with a lather. 译文:你可以通过把一张纸撕成两部分或用机床切割铁块来产生物理变化。 剖析:本句是简单句,其中by doing是固定搭配,“通过的方式”。,词海拾贝,难句剖析,理解诱思,1.Which of the statements is true? A.In a physical change,there is often a new thing formed. B.Only one new substance is formed in a chemical change. C.The pas
9、sage is developed by giving examples. D.Only by doing experiments can we tell a physical change from a chemical change. 2.Can you give an example to show the differences between a physical change and a chemical change?,答案:C,答案:The answer varies.,Section Introduction,Reading and Vocabulary,一,二,三,四,Pr
10、e-reading 一、写作词汇 语境考查,预习Introduction,Reading and Vocabulary部分的词汇,完成下列对话或语段。 1.Whats your (目标) of life? To change the world by inventing things. 2.How did they (反应) to the new rule? They were strongly against it. 3.What (结论) can we reach from the experiment? It doesnt melt without water.,aim,react,co
11、nclusion,一,二,三,四,4.You look tired.Youd better (均衡) your time between work and relaxation. 5.What does your headteacher like? Hes an (普通) man with a pair of glasses. 6.We should (形成) a good habit of studying.,balance,ordinary,form,一,二,三,四,二、阅读词汇 预习Introduction,Reading and Vocabulary部分的词汇,阅读下列句子,写出画线部
12、分的汉语意思。 1.What does water change into if heated? It changes from liquid to steam. , 2.What is soil made up of? Various chemical substances. 3.Without electricity,what would our life be like? It would be harder.,液体,水汽,物质,电,一,二,三,四,4.Objects expand when heated,but what will happen if cooled? They will
13、 contract. , 5.To do the experiment,first,boil some water.Then dissolve a tablet in it.After a while youll see something floating on the water. , ,膨胀,收缩,煮,溶解,漂浮,一,二,三,四,While-reading 三、阅读Reading and Vocabulary中的Passage A,选出正确答案 1. reacts the most with oxygen and water. A.Potassium B.Calcium C.Alumin
14、ium D.Iron 2.Which of the metals reacts the least with oxygen and water? A.Sodium. B.Magnesium. C.Potassium. D.Copper.,答案:A,答案:D,一,二,三,四,3.When heated in oxygen,magnesium . A.burns to form hydrogen B.burns to form an oxide C.reacts slowly D.doesnt react at all 4.Which metal doesnt react with water?
15、A.Iron. B.Aluminium. C.Copper. D.Sodium. 5.Which metal reacts slowly when it is heated in oxygen? A.Iron. B.Copper. C.Zinc. D.Calcium.,答案:B,答案:C,答案:A,一,二,三,四,Post-reading 四、下面一段文章是课文原文的浓缩,仔细阅读并根据课文内容将其补充完整 From Passage A we know the 1. of metals with some 2. such as water and oxygen can be 3. .It ca
16、n be seen the metals react most 4. and the metals react least 5. .When you heat calcium in oxygen,youll find it burns to form an oxide.And it can easily be seen copper doesnt 6. water.,reaction,substances,put in order,at the top,at the bottom,react with,一,二,三,四,In the first part of the experiment in Passage B,the air is dry,not wet.It shows that iron doesnt 7. when the air is dry.In the
