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在实验室里可以利用如图装置制得铁． 1A处玻璃管内所发生反应的化学方程式为． 2B处可观察到的现象是C处酒精灯的作用是 3待四氧化三铁完全反应后停止加热A处在断开AB之前应继续通入一氧化碳至A处玻璃管冷却．若不继续通入一氧化碳．可能出现的后果是．
﹣﹣.Somethingisfallingdownfromthetallbuilding ﹣﹣Dearme!It'stoodangerous. A.Workout B.Lookout C.Giveout D.Hangout
﹣HowwasyourfivedaycampNick? ﹣﹣Thelivinginthecamparejustawfulnohotwaterandsleepingintents. A.situations B.relations C.conditions D.populations
﹣Jilllikesclimbingmountains. ﹣Yes.Butclimbingmountainsisoneofsportsintheworld. A.dangerous B.moredangerous C.mostdangerous D.themostdangerous
除去NaCl溶液中CaCl2MgCl2Na2SO4．杂质的操作有①加过量的NaOH溶液②加过量的BaCl2溶液③过滤④加适量的稀盐酸⑤加过量的Na2CO3溶液． [提示MgOH2BaSO4BaCO3难溶于水微溶物不形成沉淀．] 1以上操作合理的先后顺序为数字序号不能重复使用． 2请写出BaCl2溶液与Na2SO4溶液反应的化学方程式．
1硫酸除铁锈Fe2O3的化学方程式为． 2请简答金属铝较活泼为什么通常铝制品却很耐腐蚀 3请简答吹灭蜡烛的灭火原理．
﹣TheArtFestivaliscoming.We'regoingtowatchtheTwelfthNight. ﹣﹣. A.Enjoyyourtime B.That'salltight C.Itdoesn'tmatter D.Withpleasure
你能为明天的志愿活动想出更好的计划吗? Couldyouabetterplanforthetomorrow'svolunteer?
﹣﹣Whatdidthedoctorsaytoyou? ﹣﹣Heaskedme. A.howwasIfeeling. B.whendidIgotobed. C.whyIrefusehisadvice. D.whetherIhadeatencoldfood
﹣Didyouwatchthecompletematch? ﹣﹣No.Thegamewasalreadyinwhenwetookourseats. A.progress B.memory C.location D.nature
ThesebeautifulpoemsbyLiBaiarestillpopulartoday.Theyhavethetestoftime. ﹣That'strue.Classicswillneverbeoutofdate. A.failed B.stood C.hold D.caught
﹣Doesyourbrothergetupearlyorlate? ﹣Heusedtoverylatebutnowheisusedtoearly. A.getupgettingup B.gotupgetup C.gettingupgetup D.gettingupgettingup
﹣Ihaven'tfindthebookreportofJourneytotheWest.It'ssodifficult. ﹣Youshouldhurryup.Thereportisduethreedays. A.in B.for C.on D.at
﹣ImissedthematchbetweenMaLongandFanZhendonglastnight.May. ﹣Amazing.It'sthemostexcitingmatchoftheworldtabletennis. A.CanIhelpyou. B.Couldyouhelpme. C.What'sitabout. D.What'sitlike.
﹣Whichsportdoyouoftendosoccerorbasketball? ﹣andIalsolikeplayingvolleyballafterschoolwithmyclassmates. A.All B.Both C.Neither D.None
﹣AreallthesemodelcarsTom's ﹣Yeahoneofhishobbiesistomodelcars A.introduce B.collect C.borrow D.develop
金属酸碱盐是具有广泛用途的重要物质．某化学活动小组的同学围绕这四类物质进行了一系列的探究活动． 1在一定质量CuNO32AgNO3和AlNO33的混合溶液中加入过量的Zn过滤可以得到固体和溶液． ①请写出一个有关反应的化学方程式． ②反应后所得溶液的质量与反应前溶液的质量相比．可能保持不变为什么 2为探究一瓶氢氧化钠固体的变质情况部分变质或完全变质同学们进行了如下实验． ①取少量该固体样品置于试管中向其中加入一种无色溶液．发现有气泡产生说明该样品中含有碳酸钠由此可确定该固体已发生变质．则无色溶液可能是填名称该反应的化学方程式为． ②为探究该固体中是否还有未变质的氢氧化钠同学们又进行了如表所示的实验．碳酸钠的水溶液呈碱性它的存在会对氢氧化钠的检验造成干扰．请根据如图部分物质的溶解性表20℃所提供的信息请将下表填写完整． 3将527g稀盐酸加入盛有50g碳酸钙的烧杯中恰好完全反应请计算反应后所得不饱和溶液的溶质质量分数．
﹣HowlongcanIthebookHarryPotter? ﹣Oneweek!Anddon'tittoothersOK? A.keepborrow B.borrowlend C.keeplend D.lendborrow
我听到办公室里的电话一直在响但没有人接听.pick Iheardthetelephoneringingallthetimebutnobody.
﹣﹣MayIgooutforashortbreakMr.Smith? ﹣﹣.Let'scontinuethemeetingwhenyoucomeback. A.Goahead B.Itdepends C.Nevermind D.Takeiteasy
ABCD均含有同一种元素它们的转化关系如图部分物质和反应条件略去．A是白色难溶固体相对分子质量为100金属元素的质量分数为40%C常作干燥剂D属于碱．则A的一种用途是B的化学式为由C转化为D的化学方程式为．
﹣﹣SteveTVinthelivingroomwhenhismothercamein. A.watched B.waswatching C.haswatched D.hadwatched
﹣﹣Wealwaysgosomewhereinterestingtheholidaybegins. ﹣﹣Thatsoundsgood.CanIjoinyou? A.assoonas B.unless C.sothat D.eventhough
﹣Wereallyenjoyedourselvesattheparty.ThanksagainMr.andMrs.White ﹣﹣.Justdropinwheneveryoufeellikeit. A.Withpleasure B.Nevermind C.Nicehavingyouare D.It'sniceofyou
﹣HowdoyoulikeJohn? ﹣﹣Heissuchanmanthatwecanalwaystrusthim. A.bright B.silly C.honest D.unusual
﹣Whywereyoulatefortheparty? ﹣﹣IwalkedveryslowlybecauseIwasafraidthatImightinthedark. A.lookover B.fallover C.goover D.thinkover
我们将去看望在医院生病的孩子以使他们高兴起来.cheer Wewillvisitthesickkidsinthehospital.
﹣Mr.LiIcan'tunderstandsomeofyourlessonsinclass. ﹣﹣Don'tworryIwillsomeofthedifficultpartsforyouafterclass. A.record B.research C.remember D.report
﹣WhatdoyouthinkofyourhometownHuangzhouLiuTao? ﹣Verybeautifulinspring.Lotsofvisitorscomeandseeflowerseveryyear. A.especially B.quickly C.generally D.probably
为什么不浏览一下网页找找有关信息呢?look Whynotthewebtofindsomeinformationaboutit?
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