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1、 Introductionandwriting tongs crucible dissolve solid liquid gas balance Bunsenburner testtube 1 a Waterexistsasasolid aliquidandagas b Waterexistsasasolidandaliquidonly 2 a Whenyouheatametal itexpands b Whenyouheatametal itcontracts Guess listenandchecktheanswer Listening 3 a Steelisamixtureofirona
2、ndothersubstances b Steelisamixtureofironandoxygen 4 a Two thirdsoftheearth ssurfaceiswater b 50 oftheearth ssurfaceiswater 5 a Thedistanceofthesunfromtheearthis25 5000kilometres b Thedistanceofthesunfromtheearthis150 500 500kilometers 6 a Theearthis4 6millionyearsold b Theearthis4 6billionyearsold
3、7 a Theearthistwiceaslargeasthemoon b Theearthisforty ninetimeslargerthanthemoon Putthesewordsinpairsorgroups aircontractearthgasliquidoxygenmoonsolidsunexpand 1 air gas oxygen2 contract expand3 earth sun moon4 gas liquid solid 1 liquid 液体 2 expand vi 使 膨胀 Metalsexpandwhentheyareheated 3 contractvi
4、收缩 Metalscontractastheygetcooler 4 substancen 物质 5 mixturen 混合物 6 oxygen氧气 7 electricityn 电 Answerthequestions Whichoftheabovearenatural Electricity iron somemetalsandairarenatural 2 Whichareman made Steel somemetalsandglassareman made electricityironmetalsteelairglass 3 Whichcanbeboth Electricityan
5、dsomemetals alloysforexample canbeman madeandoccurnaturally Listeningtext 1 Waterexistsasasolid aliquidandagas 2 Whenyouheatametal itexpands 3 Steelisamixtureofironandothersubstances 4 Two thirdsoftheearth ssurfaceiswater 5 Thedistanceofthesunfromtheearthis150 500 500kms 6 Theearthis4 6billionyearso
6、ld 7 Theearthisforty ninetimeslargerthanthemoon Listeningandwriting Youwillhearaconversationinwhichateacherhelpsastudentdoanexperiment ReadtheAimbelowandpredicttheResult Aim Tofindoutifthereisachangeinweightwhenthemetalmagnesiumburnsinair Result Aim Tofindoutifthere sachangeinweightwhenmagnesiumburn
7、sinair Listenandcompletethedescriptionofthescientificexperiment Apparatus Method Magnesium Bunsenburner abalance acrucible First putthemagnesiuminthecrucible Thenputthecrucibleonthebalanceandweighit Next heatthemagnesium LighttheBunsenburnerandholethecrucibleoverit Finallyweighthemagnesiumagain Resu
8、lt Conclusion Itweighsalittlemorethanbefore Thereisachangeinweightwhenmagnesiumburnsinair Listeningtext MrC MrChen Z K ZhouKai L K LiKang MrC OK boysandgirls we regoingtodoanexperiment Comeabitcloser Thecloseryouare themoreyou llsee That sright Now what stheaimofthisexperiment ZhouKai Z K Wewanttofi
9、ndoutifthere sachangeinweightwhenmagnesiumburnsinair MrC That sright Sowhatdoweneedfirst Z K Um Weneedsomemagnesium Howmuchdoweneed Whataboutthispiece IsthispieceOK MrC No weneedrathermorethanthat abouttwoandahalfgrams Weneedapiecewhichismuchbiggerthanthat Z K OK AndweneedaBunsenburner abalance anda
10、crucibletoputthemetalin Heretheyallare Wheredowegofromhere MrC Well first putthemagnesiuminthecrucible Thenputthecrucibleonthebalanceandweighit Z K OK MrC Howmuchdoesitweigh Takealook everyone Isitanyheavier Z K Um Itweighstwoandahalfgrams Doyouwantmetowritethatdown MrC Yes writeitdown Whatnext Z K
11、Yes Um next we regoingtoheatthemagnesium SoIlighttheBunsenburner Afterthat Iholdthecrucibleoverit Ohlook it sburningwithawhitelight It sgettingbrighterandbrighter MrC It spretty isn tit Keepthenoisedown boysandgirls please Z K Um lastly weneedtoweighthemagnesiumagain Itweighsfourgramsnow MrC Sowhatd
12、oesthattellyou Z K Itweighsalittlemorethanbefore MrC Howmuchmore Z K 1 5gramsmore MrC Andwhatdoesthatmean Z K Itmeansthatthereisachangeinweightwhenmagnesiumburnsinair MrC You vegotit Welldone Sonow let sdothesameexperimentwithcopper Comealong LiKang it syourturnnow Whatdoyouthinkwillhappenifyouheatc
13、opper Z K Ithinkit llbealotheavierthanmagnesium ShallIbegin MrC Yes goahead 1 Wheredowegofromhere means A Whatshallwedonext B Isthistherightway 2 Keepthenoisedown means A Don ttalkB Talkquietly Choosethecorrectmeaning 3 You vegotit means A You veunderstoodB Youhavesomething4 Goahead means A GoawayB
14、Begin5 It syourturn means A You renextB Turnround Decidewhattheaimoftheexperimentis ListeningandspeakingonPage95 Theaimistowriteasecretmessage Putthestagesinthecorrectorder 1 2 3 4 bsqueezelemonandpourthejuiceintoacontainer fdipyourpenintothejuice awriteyourmessageonapieceofpaper gblowonthepapertodr
15、ythelemonjuice 5 elightacandle 6 cheatthepaperinthecandleflame 7 dthemessageappearswhenthejuicereactswithoxygenandproducesbrownoxide Listeningtext Theaimofthisexperimentistowriteasecretmessagewithinvisibleink Fortheexperiment youneedthefollowingthings alemon asmallcontainer apen somewhitewritingpape
16、r acandleandsomematches First squeezethelemonandpourthejuiceintoacontainer Aglassoracupwillbefine Next takeyourpenanddipitintothelemonjuicethenwriteyourmessageinlargelettersonacleansheetofwhitewritingpaper Afterthat blowonthepapertodrythelemonjuice Yoursecretmessageisreadyandyoucanexchangemessageswithanotherstudent Next lightacandlewiththematches Finally holdthepapernearthecandleflame Themessagewillgraduallyappearonthepaper Thewordsarealightbrowncolor Themessageappearsonthepaperwhenyouheatitbeca
