高中英语 Module 5 A Lesson in a Lab Section Ⅰ Introduction,Reading & Vocabulary课件 外研必修1.ppt
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1、Module 5A Lesson in a Lab2021/8/11 星期三1词海拾贝 难句剖析理解诱思 Lifeisfullofsurprisingchanges.Herearetwochangesforyoutoexplore.ChemicalChangeandPhysicalChangeTherearetwokindsofchangesinourdailylifethechemicalchangeandthephysicalchange.Inachemicalchange,thereisalwaysanewsubstanceformed.Breakingupwaterintohydrog
2、en1andoxygenisachemicalchange.Ineachofthechemicalchangeatleastonenewsubstanceisformed.Achangeisnotachemicalchangeifitdoesntformanewsubstance.2021/8/11 星期三2词海拾贝 难句剖析理解诱思 Physicalchangesareverycommon,too.Therearemanyexamples.Youcanmakeaphysicalchangebytearing2apieceofpaperintotwo,orbycuttingapieceofir
3、onwithalathe3.Herethepaperisstillpaper,andtheironisstilliron.Anotherwayofmakingaphysicalchangeisdissolvingsomethinginwater.Whenyoudissolvesaltinwater,thesaltdisappears.Youmaythinkthatanewsubstancehasbeenformed.Butinfactthereisnonewsubstance.Thesaltisstillsalt.Youcanstilltasteit.Sothedissolvingofsome
4、thingisusuallyaphysicalchange.2021/8/11 星期三3词海拾贝 难句剖析理解诱思 Whenwaterfreezes,thechangeisalsoaphysicalone.Thewaterchangesfromliquidtosolid.Butitisstillthesamesubstance.Thatiswhythefreezingofanythingisaphysicalchange.Andpeopleoftentellthedifferencesbetweenachemicalchangeandaphysicalchangethroughsomeexpe
5、riments.Inthismodule,letsexplore4themagicalscienceworldbydoingexperimentsbyourselves.2021/8/11 星期三4词海拾贝 难句剖析理解诱思 译文:化学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。2021/8/11 星期三5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
6、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。2021/8/11 星期三6词海拾贝 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。2021/8/11 星期三7词海拾贝 难句剖析理解诱思 1.substancesb
7、stsn.物质,东西2.hydrogenhaIdrdnn.氢气3.latheleIn.车床4.exploreIksplv.探测,探索2021/8/11 星期三8词海拾贝 难句剖析理解诱思 Youcanmakeaphysicalchangebytearingapieceofpaperintotwo,orbycuttingapieceofironwithalather.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bydoing是固定搭配,“通过的方式”。2021/8/11 星期三9词海拾贝 难句剖析理解诱思 1.Whichofthestatements
8、istrue?A.Inaphysicalchange,thereisoftenanewthingformed.B.Onlyonenewsubstanceisformedinachemicalchange.C.Thepassageisdevelopedbygivingexamples.D.Onlybydoingexperimentscanwetellaphysicalchangefromachemicalchange.2.Canyougiveanexampletoshowthedifferencesbetweenaphysicalchangeandachemicalchange?答案:C答案:T
9、heanswervaries.2021/8/11 星期三10Section Introduction,Reading and Vocabulary2021/8/11 星期三11一二三四Pre-reading一、写作词汇语境考查,预习Introduction,ReadingandVocabulary部分的词汇,完成下列对话或语段。1.Whatsyour(目标)oflife?Tochangetheworldbyinventingthings.2.Howdidthey(反应)tothenewrule?Theywerestronglyagainstit.3.What(结论)canwereachfrom
10、theexperiment?Itdoesntmeltwithoutwater.aimreactconclusion2021/8/11 星期三12一二三四4.Youlooktired.Youdbetter(均衡)yourtimebetweenworkandrelaxation.5.Whatdoesyourheadteacherlike?Hesan(普通)manwithapairofglasses.6.Weshould(形成)agoodhabitofstudying.balanceordinaryform2021/8/11 星期三13一二三四二、阅读词汇预习Introduction,Reading
11、andVocabulary部分的词汇,阅读下列句子,写出画线部分的汉语意思。1.Whatdoeswaterchangeintoifheated?Itchangesfromliquidtosteam.,2.Whatissoilmadeupof?Variouschemicalsubstances.3.Withoutelectricity,whatwouldourlifebelike?Itwouldbeharder.液体水汽物质电2021/8/11 星期三14一二三四4.Objectsexpandwhenheated,butwhatwillhappenifcooled?Theywillcontrac
12、t.,5.Todotheexperiment,first,boilsomewater.Thendissolveatabletinit.Afterawhileyoullseesomethingfloatingonthewater.,膨胀收缩煮溶解漂浮2021/8/11 星期三15一二三四While-reading三、阅读Reading and Vocabulary中的Passage A,选出正确答案1.reactsthemostwithoxygenandwater.A.PotassiumB.CalciumC.AluminiumD.Iron2.Whichofthemetalsreactsthele
13、astwithoxygenandwater?A.Sodium.B.Magnesium.C.Potassium.D.Copper.答案:A答案:D2021/8/11 星期三16一二三四3.Whenheatedinoxygen,magnesium.A.burnstoformhydrogenB.burnstoformanoxideC.reactsslowly D.doesntreactatall4.Whichmetaldoesntreactwithwater?A.Iron.B.Aluminium.C.Copper.D.Sodium.5.Whichmetalreactsslowlywhenitishe
14、atedinoxygen?A.Iron.B.Copper.C.Zinc.D.Calcium.答案:B答案:C答案:A2021/8/11 星期三17一二三四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FromPassageAweknowthe1.ofmetalswithsome2.suchaswaterandoxygencanbe3.Itcanbeseenthemetalsreactmost4.andthemetalsreactleast5.Whenyouheatcalciuminoxygen,youllfinditburnstoformanoxi
15、de.Anditcaneasilybeseencopperdoesnt6.water.reactionsubstancesputinorderatthetopatthebottomreactwith2021/8/11 星期三18一二三四InthefirstpartoftheexperimentinPassageB,theairisdry,notwet.Itshowsthatirondoesnt7.whentheairisdry.Inthesecondpartoftheexperiment,youmust8.thewatertomakesurethereisnoairinit.You9.some
16、oiltothewaterbecausethis10.airoutofit.Itshowsthatirondoesntrustinwaterthathasnoairinit.rustboiladdkeeps2021/8/11 星期三1912345671.When you heat a metal,it expands.(P41)当你加热金属时,它会膨胀。考点:expand vi.膨胀Atyreexpandswhenyoupumpairintoit.轮胎一打气就鼓起来。考点延伸1)阅读下列句子,体会黑体词的意义Ourforeigntradehasexpandedgreatlyinrecentye
17、ars.我们的对外贸易近年来已有极大的发展。意义:发展Thepetalsoftheflowersexpandedinthesunshine.花瓣在阳光下张开了。意义:伸展,张开2021/8/11 星期三2012345672)阅读下列句子,体会黑体词的意义Thewaistexpandstofitallsizes.腰围可拉松适合任何尺码。意义:变大,扩大Canyouextendyourvisitforafewdayslonger?你能多停留几天吗?意义:伸长,延长Thesweaterhasstretched.这件毛衣给撑得变形了。意义:拉长;撑大;撑松Thediseaseisspreadingfa
18、st.这种病正在迅速蔓延。意义:(使)蔓延,扩散,散开2021/8/11 星期三211234567辨析:(1)expand展开、扩大,不仅指尺寸的增加,还可指范围和体积的扩大。(2)extend伸出,延伸,指空间范围的扩大,以及长度、宽度的朝外延伸,也可指时间的延长。(3)stretch伸展,拉长,一般指由曲变直,由短变长的伸展,不是加长。(4)spread伸开,传播,一般指向四面八方扩大传播的范围,如传播(疾病)、散布(信息)等。2021/8/11 星期三221234567Asthefluisspreadingthroughthewholeschool,theheadmasterhasdec
19、idedtoextendtheholidaybyanothertwodays.Moststudentscanlieinbed,stretchingthemselvestohavearest.因为流感正在整个校区蔓延开来,校长已决定假期再延长两天。多数学生可以躺在床上,舒展身体休息一下了。2021/8/11 星期三231234567答案:1)expand2)expanded2021/8/11 星期三241234567答案:3)expand4)extends5)spread(s)6)stretched2021/8/11 星期三2512345672.It is hard to think of a
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