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下列实验操作正确的是（ ）
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高三上学期化学《》真题及答案
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正确的化学实验操作是实验成功的重要保证下列实验操作正确的是
倾倒液体
过滤
检查气密性
检验氧气是否收集满
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
正确的操作是实验安全和成功的基本保证下列实验操作正确的是
取用液体
加热液体
过滤
收集氧气
某化学兴趣小组的同学按下图操作完成粗盐含有难溶性杂质提纯的实验下列说法中正确的是
各项实验操作完全正确
正确的操作顺序为①⑤②③⑥④
去除杂质的关键步骤是④
操作③④中玻璃棒的作用是相同的
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
过滤河水
检查装置气密性
选择下列部分实验操作可完成两个实验甲实验为除去粗盐中难溶性的杂质乙实验为配制溶质质量分数为10%的氯
操作①和⑤中玻璃棒的作用是相同的
甲实验和乙实验都要用到实验操作①
甲实验在操作⑤时，将水全部蒸发后停止加热
乙实验在操作③时，若俯视读数，会使所配制溶液的溶质质量分数偏小
正确的化学实验操作是实验成功的重要保证下列实验操作正确的是
倾倒液体
过滤
检查气密性
氧气验满
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
正确的化学实验操作是实验成功的重要保证下列实验操作正确的是
倾倒液体
过滤
检查气密性
检验氧气是否收集满
正确的实验操作对实验结果人身安全非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
倾倒液体
正确的实验操作对实验结果人身安全非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
正确的实验操作是实验成功的基本保证下列实验操作正确的是
检查装置气密性
蒸发
加热液体
量取液体体积
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
下列与演示实验基本要求无关的叙述是
讲清演示实验的步骤和方法
引导学生分析实验现象
指导学生正确操作
方法要科学、操作要规范
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
正确的实验操作是实验成功的基本保证下列实验操作正确的是
检查装置气密性
蒸发
加热液体
量取液体体积
正确的实验操作对实验结果人身安全非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
倾倒液体
正确的实验操作是实验成功的基本保证下列实验操作正确的是
检查装置气密性
蒸发
加热液体
量取液体体积
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
过滤河水
检查装置气密性
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下列关于物质或离子检验的叙述正确的是
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下列说法正确的是
下列关于试剂保存的叙述中不正确的是
8分InareasliketheCentralUnitedStatesthatgetlotsoftornadoesthere′sacommonpieceofcelestial天上的fortune﹣tellingthatgreenskiesmeanatornadoisonitsway.Researchhasshownthatitisn′tquiteassimpleasthatbutscientistshavefoundthatifyouseeagreenskyyoushouldprobablygoinside.Asfarasmostscientistscantellthegreenskiesaroundpowerfulthunderstormsareusuallyacombinationofredsunsetsandwaterdroplets.Daytimeskiesarebluebecauseblueshorterwavelengthsofvisiblelighttendtobounceoff反射airmoleculesbetterthanredlongerwavelengthlight.Sothebluelightgetsbouncedallovertheskyandlookslikeit'scomingfromeverywhere.Meanwhilearoundsunsetsunlighttravelsthroughsomuchatmospherethatjustaboutalltheblueisbouncedawayfromthehorizonleavingallthoseredsandorangesbehind.Thesunsetmightlookexclusively独有的redandorangebutthere'sstillsomegreenandevenbluelighthiddenintherejustfarlessthantheothercolors.Butforustonoticetheremaininggreenlightitneedstohitsomethingthatreflectsgreenlightmuchbetterthanred.That'swherewatercomesin.Bigtallthreateningstormcloudsaremadeofwaterdropletsandeventhoughwaterisbestatreflectingbluelightitcanstillreflectgreenprettywellmuchbetterthanredsandorangessounderjusttherightconditionsthewaterinandaroundacloudcanbouncethegreenlighthiddeninthesunsetrightintooureyesmakingtheskylookgreen.Stillnoneoftheconditionsthatcanturnskiesgreenareuniquetothecloudsthatproducetornadoes.Sometimestheyjustleadtolotsofrainandmaybesomehail.Soifyouseehugestormcloudsrollinginandagreentint色调intheskyitdoesn'tnecessarilymeanthere′sabouttobeatornadobutitdoesmeanyoushouldprobablyheadindoors.1.Whatcanbethebesttitleforthetext?A.WhyDotheCentralUnitedStatesGetTornadoesB.DoGreenSkiesMeanaComingTornadoC.ACommonPieceofCelestialFortune﹣tellingD.GreenSkiesAreUniquetoClouds2.Whyaretheskiesblueinthedaytime?A.Becauseonlybluelightcanbebouncedinthedaytime.B.Becausethereismorebluelightthanlightofothercolors.C.Becausebluelightisbouncedalloverthesky.D.Becauseredlightisweakerthanbluelight.3.Whatdoestheunderlinedword'it'inparagraph2referto?A.Thesunset.B.Redlight.C.Bluelight.D.Water.4.Whatcanwelearnaboutfromthetext?A.Stormcloudsaremadeofwaterdropletsandgreenlight.B.Watercanreflectredlightaswellasbluelight.C.Thereareonlyredandorangelightsinthesunsets.D.Ifyouseeagreenskytherewillbeatornado.
同质量的下列气体中所含原子数最少的是
10分Tippingispartofeverydaylifeinmanypartsoftheworld.It'susuallyaninformalchargethat'spaidontopofthebilltoshowappreciationtothepersonwhohasprovidedyouaservice.Tippingculturecanvaryfromplacetoplace.IntheMiddleEastpeoplewhoserveusuallytrytobemorehelpful.1.AnexampleisthetourguidesofEgypt.WhenatouristgoesaroundafamoussiteinEgyptlikethepyramidsthey′11oftenbeaccompaniedbyaveryqualifiedtourguide.Thankstotheguideatouristwillcertainlyknowmoreaboutthepyramidsthanheorshedidatthestart.2.Insomeplacestippingdoesn'texistatall.Tipsaren'tpartoflifeinChinaSouthKoreaorJapan.ButinotherplacesinAsianotleavingatipcanleadtotrouble.AnAmericantravelagenttoldCondeNastTravelerthatinIndiaforexampleapersonwhodoesn'tleaveatipafteramealinarestaurantwilloftenbechaseddownthestreet.3hesaid.Manypeopleonlygivetipsonasubjective主观的basis.Butit'sthissubjectiveaspecttotippingthatcancauseproblems.Ontheonehandtheydon'twanttobemean;ontheotherhandtheydon'twanttopaytoomuchandfeelthatthey'vebeencheated.4.Acommonsolutionforthisproblemistoofferaguidelineonthecheck.5.Thiscanpreventtheawkwardnesswhenit'stimetopayup.A.TipsarethengiventoappreciatetheexpertiseoftheguideB.IfyoutipbadlypeoplethinklessofyouC.They'llrunafteryouandscreamformoneyD.ItwillsuggestthatacertainpercentageofthebillshouldbepaidontopasatipE.VeryoftenpeoplewhotraveltotheUnitedStatesforgettotipF.Afterallatipisn'tpartofthebillG.Buttheymayexpectalittleextrainreturn
下列物质中可用来干燥NH3的是
在元素周期表中金属元素与非金属元素分界线附近能找到
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25分假定你是学校动物保护协会志愿者李华你校留学生Mike对动物保护很热心来信咨询你们协会的日常工作内容和报名条件.请你写一封回信内容包括: 1.工作内容:进社区宣传;照顾流浪动物等; 2.志愿者要求:有爱心时间灵活; 3.报名方式. 注意: 1.词数100左右; 2.可适当增加细节以使行文连贯. 3.参考词汇:动物保护协会一AnimalProtectionAssociation;流浪动物一strayanimals DearMike Yours LiHua
硫酸铁铵[NH4FeSO42•xH2O]是一种重要铁盐．为充分利用资源变废为宝在实验室中探究采用废铁屑来制备硫酸铁铵具体流程如图 回答下列问题 1步骤①的目的是去除废铁屑表面的油污方法是． 2步骤②需要加热的目的是温度保持80﹣95℃采用的合适加热方式是．铁屑中含有少量硫化物反应产生的气体需要净化处理合适的装置为填标号． 3步骤③中选用足量的H2O2理由是．分批加入H2O2同时为了溶液要保持pH小于0.5． 4步骤⑤的具体实验操作有经干燥得到硫酸铁铵晶体样品． 5采用热重分析法测定硫酸铁铵晶体样品所含结晶水数将样品加热到150℃时失掉1.5个结晶水失重5.6%．硫酸铁铵晶体的化学式为．
X﹣的核外电子排布为288则X元素在周期表中的位置是
镭是周期表中第7周期的IIA族元素下列关于镭的性质的描述中不正确的是
陶瓷是火与土的结晶是中华文明的象征之一其形成性质与化学有着密切的关系．下列说法错误的是
下列物质属于碱的是
下列仪器在使用中不能加热的是
Onedayalltheemployeesofaveryfamouscompanyreachedtheirofficeandallsawabigsignonthemaindoorwhichsaidthis Yesterdaythe1whohasbeenhindering阻碍yourgrowthinthiscompany2.Weinviteyoutojointhefuneralintheroomthathasbeen3inthegym. Inthebeginningtheyallgot4forthedeathofoneoftheircolleaguesbutafterawhiletheystartedgetting5toknowwhowasthatpersonthathinderedthe6oftheircolleaguesandthecompanyitself. The7inthegymwassuchthatsecurityagentswereorderedtocontrolthecrowd8theroom.Themorepeople9thecoffin棺材themoretheexcitementheatedup.Everyonethought10isitthatwasholdingmeback? Onebyonetheintrigued好奇的employeesgotclosertothecoffinandwhentheylookedinsideitthey11becamespeechless. Theyallgottostandnearthecoffinandfeltshockedand12asifsomeonehadtouchedthedeepestpartoftheir13.Therewasamirrorinsidethecoffineveryonewho14itcouldseethemselves!Therewasalsoasignnexttothemirrorthat15 Thereisonlyonepersonwhoiscapableofsetting16toyourgrowthandITISYOU！Yourlifedoesnot17whenyourbosschangeswhenyourfriendschangewhenyourparentschangewhenyourhusbandorwifechanges… NoyourlifechangeswhenYOUchangewhenyou18yourlimitingbeliefsinside. Examineyourselfwatchyourself.Don'tbeafraidof19impossibilitiesandlosses.Beawinnerbuildyourselfandyourreality.Rememberit'sthewayyoufacelifeitselfthatmakesthe20. 1A.person B.boss C.sign D.funeral 2A.diedaway B.diedout C.passedaway D.passedout 3A.protected B.prevented C.proved D.prepared 4A.happy B.sad C.joyful D.grateful 5A.calm B.curious C.conscious D.convenient 6A.growth B.width C.faith D.strength 7A.way B.meaning C.excitement D.disappointment 8A.within B.without C.about D.around 9A.bought B.sold C.reached D.touched 10A.What B.Which C.Where D.Who 11A.carefully B.actually C.suddenly D.madly 12A.insilence B.inreturn C.inneed D.inorder 13A.hand B.soul C.mouth D.face 14A.putoutside B.putinside C.1ookedoutside D.1ookedinside 15A.talked B.spoke C.said D.told 16A.deadlines B.demands C.1imits D.1acks 17A.continue B.cancel C.accelerate D.change 18A.gobeyond B.gotogether C.gowithout D.gotowards 19A.acquaintances B.difficulties C.advantages D.bargains 20A.profit B.wealth C.difference D.fortune
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实验室制备溴苯的反应装置如图所示关于实验操作或叙述错误的是
下列我国科技创新的产品设备在工作时由化学能转变成电能的是
在普通铝中加入少量Cu和Mg后形成一种称为拉维斯相的MgCu2微小晶粒其分散在Al中可使得铝材的硬度增加延展性减小形成所谓“坚铝”是制造飞机的主要材料．回答下列问题 1下列状态的镁中电离最外层一个电子所需能量最大的是填标号． 2乙二胺H2NCH2CH2NH2是一种有机化合物分子中氮碳的杂化类型分别是 ．乙二胺能与Mg2+Cu2+等金属离子形成稳定环状离子其原因是其中与乙二胺形成的化合物稳定性相对较高的是填“Mg2+”或“Cu2+”． 3一些氧化物的熔点如下表所示 解释表中氧化物之间熔点差异的原因． 4图a是MgCu2的拉维斯结构Mg以金刚石方式堆积八面体空隙和半数的四面体空隙中填入以四面体方式排列的Cu．图b是沿立方格子对角面取得的截图．可见Cu原子之间最短距离x＝pmMg原子之间最短距离y＝pm．设阿伏加德罗常数的值为NA则MgCu2的密度是g•cm﹣3列出计算表达式．
2molAl的质量为
某同学进行有关铜硝酸硫酸化学性质的实验实验过程如图所示 下列说法正确的是
下列化学用语不正确的是
NaOH溶液滴定邻苯二甲酸氢钾邻苯二甲酸H2A的Ka1＝1.1×10﹣3Ka2＝3.9×10﹣6溶液混合溶液的相对导电能力变化曲线如图所示其中b点为反应终点．下列叙述错误的是
InBritainandothercountriesyoungpeoplesometimestakeagapyearayearoffbetweenhighschoolandcollegeThisideanevergainedabigfollowinginAmericaRecentnewsreportshavesuggestedthatinterestmaybegrowingthoughtherearenoofficialnumbers. CharlesDeaconDeanofAdmissionsatGeorgetownUniversityinWashingtonD.C.estimatesthatinthecurrentfirst﹣yearclassof1600studentsonlyabout25decidedtotakeayearoff.Hesaysthisnumberhasnotchangedmuchovertheyears. Mr.Deaconsaysthemostcommonreasonfortakingagapyearistohaveachancetotravelbuthesaysinternationalstudentsmaytakeagapyeartomeetrequirementsathomeformilitaryduty. Somehighschoolgraduatesseeayearoffasachancetorecoveraftertwelveyearsofrequirededucationbutitcanalsogivestudentsachancetoexploretheirinterests.Studentshopingtobedoctorsforexamplecouldlearnabouttheprofessionbyvolunteeringinahospital. Manycollegesanduniversitiessupportgap﹣yearprojectsbypermittingstudentstodelaytheiradmission.Expertssaystudentscangrowemotionallyandintellectuallyastheyworkatsomethingtheyenjoy. TheHarvardadmissionsofficehasanessayonitswebsitecalledTimeOutorBurnOutfortheNextGeneration.Itpraisestheideaoftakingtimeoff.tostepbackthinkandenjoygaininglifeexperiencesoutsidethepressureofstudies.ItalsonotesthatstudentsaresometimesadmittedtoHarvardorothercollegespartlybecausetheydidsomethingunusualwiththattime. OfcourseagapyearisnotforeveryoneStudentsmightmisstheirfriendswhogoondirectlytocollege.Andparentsmightworrythattheirchildrenwilldecidenottogotocollegeoncetheytaketimeoff.Anotherconcernismoney.Ayearoffawayfromhomecanbecostly. HollyBull'sjobistospecializeinhelpingstudentsplantheirgapyear¨.Shenotesthatseveralbookshavebeenwrittenaboutthissubject.ShesaysthesebooksalongwithmediaattentionandtheavailabilityofinformationontheInternethaveincreasedinterestintheideaofayearoffandshepointsoutthatmanygap﹣yearprogramscostfarlessthanayearofcollege. 1Whatisthepassagemainlyabout? A.MoreandmoreAmericanstudentsarechoosingtotakeayearoff. B.IfyouwanttogotoanAmericanuniversitytakeagapyearfirst. C.ItislikelythattakingagapyearisbecomingpopularinAmerica D.Americansholddifferentopinionstowardsstudents'takingagapyear. 2Howmanyreasonsforstudents'takingagapyeararementionedinthepassage? A.2 B.3 C.4 D.5 3TheessayTimeOutorBurnOutfortheNextGenerationsuggeststhat. A.everystudentmusttakeagapyearbeforeapplyingforafamousuniversity B.somefamousuniversitiesencouragestudentstogainmorelifeexperiences C.takingagapyearcanmakestudentsfreefromlifelearning D.thestressofstudiesdoesharmtothestudents'health 4Whatcanwelearnfromthepassage? A.Booksandmediahavecontributedtothestudents'interestinschoollearning. B.CharlesDeacondoesn'tsupporttheideaofthestudents'takingagapyear. C.Parentsnightdisagreewiththeprogramconcernedabouttheirchildren'sfuture. D.Expertsagreetakingayearoffwillbenefitthestudentsemotionallyandphysically.
某无色透明的溶液中能大量共存的离子组是
科学家合成出了一种新化合物如图所示其中WXYZ为同一短周期元素Z核外最外层电子数是X核外电子数的一半．下列叙述正确的是
15分RecentlyanIndianfilm'HindiMedium'hasmade1hit!Ittoldastorythatacouplesparednoeffort2givetheirdaughterthe3goodeducationandfinallyshewasacceptedbytheeliteofDelhi.ActuallythisphenomenoncanalsobeseeninChina.Todaymoreandmoreparentsadopttheideaof''personalqualityeducation'andcommittoencouragingtheirchildrentocultivateavarietyofinterestsoutsidethe4traditionclassroomactivitieslikeplayingtheviolinrobotprogrammingandsoon.Butparticipating5toomanyextracurricularactivitiesdoesdeprivethechildrenoftheirplaytime.It6pointoutthatmoreChineseparentsneedtorealizethatthehand﹣holdingmentalityisoverwhelmingtheirchildren.Theyhavetoloosentheircontrolgivethekidstimeof7theyownandletthemtaketheinitiative.Todayparentsworry8endlessaboutpreparingthekidsfortherealworldabattlefieldwhereeveryonemustarmthemselvesforafight.Butthereisnodenying9thebesttimesinlifearethose10stealmomentswespendwithothers﹣anidleafternoonwithabelovedcompanionacupofteawithanoldfriendorasimplegameoftagwithclassmatesafterschool.
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