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实验室为探究铁与浓硫酸（足量）的反应，并验证SO2的性质，设计如图所示装置进行实验，下列说法不正确的是（ ）
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高三下学期化学《》真题及答案
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某化学活动小组需要用溶质质量分数为19.6％的稀硫酸和锌粒反应来制取氢气但实验室现有的是溶质质量分数
硫酸是中学化学实验室的常见药品其性质有①酸性②吸水性③脱水性④强氧化性以下过程或反映体现了硫酸的什么
某化学兴趣小组为探究SO2的性质按如图所示装置进行实验请回答下列问题1装置A.中盛放亚硫酸钠的仪器名
硫酸是中学化学实验室的常见药品其性质有①酸性②吸水性③脱水性④强氧化性⑤催化作用请将序号填在相应的横
聚合硫酸铁又称聚铁化学式为[Fe2OHnSO43－0.5n]m广泛用于污水处理实验室利用硫酸厂烧渣主
某化学活动小组需要用溶质质量分数为19.6％的稀硫酸和锌粒反应来制取氢气但实验室现有的是溶质质量分数
聚合硫酸铁又称聚铁化学式为[Fe2OHnSO43－0.5n]m广泛用于污水处理实验室利用硫酸厂烧渣主
实验室用铜和浓硫酸反应制取二氧化硫下列有关该反应的说法错误的是
铜是还原剂，发生了氧化反应
每生成64 g SO2，转移电子的物质的量是2 mol
每消耗1 mol Cu，起氧化剂作用的硫酸消耗2 mol
在此反应中，浓硫酸表现出酸性和氧化性
硫酸的性质有A.高沸点B.强酸性C.吸水性D.脱水性E.强氧化性在下列硫酸的用途或化学反应中硫酸可能
某同学用如图1所示的装置来探究SO2的性质及有关实验1实验前应先检验装置的气密性方法是2实验室用亚硫
用如右图所示实验装置夹持仪器已略去探究铜丝与过量浓硫酸的反应下列实验不合理的是
上下移动①中铜丝可控制SO2的量
②中选用品红溶液验证SO2的生成
③中选用NaOH溶液吸收多余的SO2
为确认CuSO4生成，向①中加水，观察颜色
硫酸的性质有A.高沸点B.强酸性C.吸水性D.脱水性E.强氧化性在下列硫酸的用途或化学反应中硫酸可能
硫酸是中学化学实验室的常见药品其性质有①酸性②吸水性③脱水性④强氧化性⑤催化作用请将序号填在相应的横
某化学兴趣小组为探究SO2的性质按如图所示装置进行实验请回答下列问题1装置A.中盛放亚硫酸钠的仪器名
实验室制取SO2的反应原理为Na2SO3＋H2SO4浓===Na2SO4＋SO2↑＋H2O请用下列装
硫酸的性质有A．高沸点B．强酸性C．吸水性D．脱水性E．强氧化性在下列硫酸的用途或化学反应中硫酸可能
某化学活动小组需要用溶质质量分数为19.6%的稀硫酸和锌粒反应来制取氢气但实验室现有的是溶质质量分数
某研究性学习小组设计实验用于制取SO2并探究SO2的某些性质制取SO2反应的化学方程式为Na2SO3
实验室为探究铁与浓硫酸的反应并验证SO2的性质设计如图所示装置进行实验请回答下列问题1实验时A.中导
如图是实验室用铜片与浓硫酸制取SO2并验证其性质的装置图.往试管1中加入一小块铜片再加入3～5mL浓
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TomarrivedatthebusstationquiteearlyfortheLondonbus.ThebusforLondonwouldnotleaveuntilfivetotwelve.Hesawalotofpeoplewaitinginthestation.Somewerestandinginlinesandotherswerewalkingabout.Therewasagroupofschoolgirls.Theirteacherwascryingtokeeptheminorder.Tomlookedaroundbuttherewasnowhereforhimtosit. Hewalkedintothestationcafé.Helookedupattheclockthere.Itwasonlytwentytotwelve.Hefoundaseatandsatdownfacingalargemirroronthewall.JustthenJohnoneofTom'sfriendscameinandsatwithTom. Whattimeisyourbus?askedJohn. OhthereisplentyoftimeyetansweredTom. OhI'llgetyousomemoreteathensaidJohn. Theytalkedwhiledrinking.ThenTomlookedattheclockagain. Goodheavens!It'sgoingback﹣ward!hecried.Afewminutesagoitwastwentytotwelveandnowit'shalfpasteleven. YouarelookingattheclockinthemirrorsaidJohn. Tomwantedtokickhimselfforbeingsofoolish.Thenextbuswasnottoleaveforanotherhour.Hehasneverlikemirrorsincethen. 1TheLondonbusleft. A.at1155 B.at512 C.before1155 D.after1155 2Tomwentintothestationcafébecause. A.Johnaskedhimtohaveacupoftea B.hewantedadrinkthere C.hewouldmeetafriendofhis D.itwasearlyyetandhewantedtofindaplacetosit 3Whattimewasitinfactwhenhelookedattheclockinthemirror? A.Halfpasttwelve. B.Halfpasteleven. C.Twentytotwelve. D.Halfpastone. 4Whichofthefollowingistrue? A.Tommissedhisbus B.Hehaslikemirrorsincethen. C.Thenextbuswouldleavesoon. D.TomarrivedLondonontime.
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Whydowedream?It'saquestionresearchershavebeenstudyingforyears.Nownewresearchsuggeststhatsomedreamsmayresultfromthebrain'sefforttokeeplearningevenaswesleep. InastudyinBoston100volunteersweretrainedforanhouronamaze迷宫.Theytriedtofindtheirwaythroughthedifficultpuzzleasquicklyaspossible.Thenhalfofthevolunteerswereallowedtosleepfor90minutes.Theotherhalfstayedawakereadingorrelaxing.Theoneswhosleptwereaskedtodescribetheirdreamswhentheywokeup. Aftertherestthevolunteerswereaskedagaintosolvethemaze.Thosewhohadn'tsleptshowednoimprovementordidevenworseafterthebreak.Sleeperswhodidn'treportanymazerelateddreamsdidbetterbutshowedonlyalittleimprovement.Howeverfournaptakerswhoreporteddreamingaboutthemazeshowedasurprisingimprovement.Theyscored10timeshigheraftersleepinganddreamingaboutthemaze. Eventhoughthenumberofdreamerswassmalltheresearchersnotedthatthegapinlearningbetweenthedreamersandnondreamerswassowidethatthefindingwassignificant有意义的. Thedreamershadallperformedpoorlyonthetestbeforedreamingaboutit.Thatsuggeststhatstrugglingwithataskmightbethetriggerthatleadsthesleepingbraintofocusonitandworkonhowtodealwithit. It'salmostasifyourbrainisgoingthrougheverythingthathappenedtodayDrStickgoldascientistatHarvardMedicalSchoolsaid.Thethingsyou'reobsessed迷住witharetheonesthatyourbrainforcesyoutocontinuetodowith. 1Whatwerethevolunteersaskedtodoaftertherest? A.Toworkonanewmaze. B.Tocontinuetodothemaze. C.Totalkwitheachotherabouttheirdreams. D.Totellwhattheythoughtaboutthemaze. 2Accordingtothestudywhichgroupshowedthegreatestimprovement? A.Thosewhodidn'tsleep. B.Thosewhosleptbutdidn'tdream. C.Thosewhodreamedaboutthemazewhilesleeping. D.Thosewhothoughtaboutthemazebeforefallingasleep. 3TheunderlinedwordtriggerinParagraph5probablymeans. A.chance B.cause C.way D.idea 4What'sthebesttitleforthispassage? A.LearningWhileYouDream B.WhatDreamsStandfor C.DreamaGoodDream D.DreamsandHealth
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DearMary IreceiveyourE﹣mailjustnow.Don'tworryaboutme.I'mgettingonwellmyresearchworkinthelab.ButtomygreatsurpriseyousayyouwillgiveuplearningEnglish.Thereasonisthatbecauseyouhavenotdonewellinitrecentlyandyouhavelostinterests.I'mafraidIcan'tagreeonyou.IknowitisdifficulttolearnEnglishbutEnglishiswideusedintheworldtoday.Itwillbeimportanttoolinourfuturework.Besideitisbecomingmoreandmoreimportantinyourdailylife.Ifyoustudyhardyouwillsucceed.Dorememberwherethereisawillthereisaway.I'mlookingforwardtoheargoodnewsfromyou.
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