ThePropertiesofWater教案

1、The Properties of Water教案Unit 13 The PWaTeaching GoalTalk about water andan.2. Praunicative skillReview Modal VerbWrite an explanationparagraThe First PeriodTeaching Aims:Learn and mawwords and the useful exa2.Leag about water by doing exDo some listeningImprovudentsspeaking ability by talking.Teach

2、ing Important Points:audents balk aboutwa2. Improvudentslistening ability by listening.Teaching Difficult Points:Howaaking.2. Howvudentslistening abilTeachingMethods:Listening-and-answering activludents go throughwlistening material.2. Individual, pair or group wake every student wlaTeachingAids:ult

3、imedia2. the blackboardaglass, a bottle of water anda bottle of vegetable oilTeaching Procedures:Greetings and Lead-inRead aand guame: A l_ . (Water)Dear Uau all, the IgnoraI am your lBut youvaluGive meallFallIf you continue abusingurely, alllife will wither awayHave you ever imagined,Life without m

4、e?I tell you, it will be unbearableThink twFor every drop couQs: 1) What does“Dearuser”?2) What dalusers?3) On which planet dxist?arth, walso calledthe water pla)Do you know walled“The waterplanet”?Because abouquaavered by wa2: Pair work:Collect as many words as possible related to waQs:How much do

5、you know about water?Is all waalty?Step3: Talk abouwaPair wT: Water is around us and inside us.We cant go without waQs: Why is waant to living things?Can youuara?Suggested vocabulary:Its colorless, tasteless, odorless anduniversal dissolvIt feels wet;It ex: liquid, solid, gas, and is cycled through

6、the water cycle;It can absorb a large amouat;Igbeads or drops;Its part of every living orgalanet;2. Group wLeaabout waterby doingle exand learn to describe an exWhawater does eaurexllustrate?What cau?Whatlated to?Exws how aure causes aaling to an upturned glass of waEx2 illustrates how substances wi

7、th ddensity behave whenplacedame contaExan example of how water dissolvessubstances and obExllustradbetween salt water and freshwaT: Whawater do you know about?What caullowinga? Can you explain?We can get a lot of nuby drinking water and having souWood floats on water whilThe coastalareas ald.Why ca

8、n some living things live at the ban wunshine?(Iquare too difficult) Try asking quabouwater and then giveansw: HomewRead the text carefully and find out the detailedinformation aboutwa2Think as many examples as possible to illustrate waTdPeriodTeaching Aims:Learn and maw words and phra2.Improvudents

9、reading abilabludalize thaawaur plaTeaching Important Points:Improvudentsreading abil2. Mallowingphrases:all the way, thax with, take advantage of, manage to doTeaching Difficult Point:How do we maudents understand the reading passagebTeaching Methods:Discussion bading to maudd in what theywill lea2

10、. Fast reading to get a general ideaxDiscussion afterreading to make students understand what theyve learnedbareful reading to get the detailed informaxt.Teaching Aids:ultimedia2. the blackboardTeaching Procedures:Greeting2 Revision andLead-inAllustrate wa: Pre-readingLook alxt below. Dad the whole

11、text. Pick out the subachparagraph. Uuctures below to make sixqulatedubWhat is/ are _ ?What does _ look like?What are darts of _ ?What can _ be compared to?How does _ work?What axamples of _?d the words andphrases which describwaading texan to Find out some basicfacts about laLarth begaans aboubilli

12、on years ago;99%living space on eaans;There are about five million (known)ans;Lans ranglagiant whalT: Yesterday you were required toaquabout waterand find out the detailed information aboutwaas well. So now lets have a little quiz abouwaTrue of falsequestions:1)Water is a liquid aature, and ithas a

13、relatively higg2)The reason why water candissolvubstaaat water has high heat capa)Like allubstances,water gets smaller (contract) w)Pure water has a higg point andlighter than salt wa)The salarths oceans is about3.5%.6)When wada)urses such as oil, gas, goldaus asa da(TFFTT FF)While-readingAs we all

14、know, Charles Darwin is famou“TheOrig”. (Accordingvolution)Qs: 1) Waany larth billars ago?2)If any, what waginal life like at that time?3) Where did it live?In the deep blue sea)Howdworld taape, wquite dwhat it used to ballvarious organisms?Billarsnatural sel2It is said that 99%living space on eaaQs

15、:1) What dact result in?Marine ldibly rich and varied.2) Can you givumbxamples?There are about five millans. They ranglants all the wayup to giants (e.g. sharks and whales).3) What dact imply? Do you agree?Water is an excellent medium for l) Whydo you agreethat water is an excellent medium for life?

16、 (Basedwledge)Water is a liquid aature and has a relatively higgpoint;All living creatures need food to survive, but onmany occaubecome available to living things only waredissolved by waSo we knowthawaterdissolvability(溶解性).Qs: 1) Do you know what gives water such a uniqu?Ta

17、l structure of wa2) What dwater molecule look like?A water moleculwo hydrogen atoms and one oxygenatom. The two hydrogen atoms are bondedxygen aa V shape.The two hydrogen aa polar molecule, thawith a slightlve end andone with a slightly negative end) Can you givxamples which arealso resulted from wa

18、ters uniqual structure?Plants can pull water uvia a capillary(毛细We can get a lot of nuby drinking souThatswaters adissolvabilwauch a universal solvan dissolve justabout anything including many gases and solids. As a resulawaQs: 1) Do you know the salarths oceans?about 3.5%.2) What dan?3) Have you ev

19、d such aat in winter waaall rivwhile that in seasnot? Can you explain it?The sala water can agwater. Sea water has alower agven watua water falls below 0C, sea wallliquidHowevatter wa waure water,“wood floats onwater whil”always works. How do you explain that? Whawa?If a substance has a lower dan wa

20、ter dwill float on water;OtherwwillQs: 1) What is density? And whats the dure water?Dlabetween mass and volume and is measured inkilub(kg/m3). The dwa000kg/2) Does it also gat Ice looks largerthan waqual mass?Yes. Waters density decreases wuvolua) Does all thewaame rivan have equal density? Tell you

21、r reaNo. Changesin salinity and temperature affect waters dld wagh salinityusualldense and will tendbaQs: 1) What do ddan result in?Dense waand less dense waushedurface. Thus waanis always moving2) Whaa cault help us explain? Please giveexamples. (Iary, give studuch as showing a picture etc.)alpsmov

22、e nuaround and adds energaDaatures live in dlevelan.(Becaudd, su)Read following statement and think whatconclusion you can draw? Or whad?It is said that a man of 60kg loses about 1Lwaugh breath and skin evaporation (皮肤蒸发) every day.Iwordal heat is releasedwo ways. If so much heat wuman body,it would raise bodature by 9C. Can youimagult?Water has a relatively high heat capacity and canaccommoda