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已知函数f(x)=,g(x)=f(x)-ax+a,若g(x)恰有1个零点,则a的取值范围是( )
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高三下学期数学《》真题及答案
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亚硝酰氯ClNO是有机合成中的重要试剂工业上可用NO与Cl2合成回答下列问题 1一定条件下氮氧化物与悬浮在大气中的海盐粒子相互作用时会生成亚硝酰氯涉及热化学方程式和平衡常数如表一 表一 则△H3=用△H1△H2表示K3=用K1K2表示 2300℃时在一密闭容器中发生反应2ClNOg⇌2NOg+Cl2g其正反应速率表达式为 v正=k•cnClNO.测得速率和浓度的关系如表二 表二 则n=k=达到平衡后若减小压强则混合气体的平均分子量将填“增大”“减小”或“不变”. 325℃时向体积为2L且带气压计的恒容密闭容器中通入0.08molNO和0.04molCl2发生反应 2NOg+Cl2g⇌2ClNOg△H. ①若反应起始和平衡时温度相同测得反应过程中压强p随时间t的变化如图Ⅰ曲线a所示则△H0填“>”“<”或“不确定”若其他条件相同仅改变某一条件时测得其压强p随时间t的变化如图Ⅰ曲线b所示则改变的条件是. ②图Ⅱ是甲乙同学描绘上述反应平衡常数的对数值lgK与温度的变化关系其中正确的曲线是填“甲”或“乙”m值为.
AftergraduationSusanwasaskedtobecometheexecutivedirectoroftheFloatingHospital.She1atfirstasitwasaverybigjobandshedidn'tknowifshecould2it.Butfinallyshe3.Whileherjobwasrewardingshesoongottiredofit.Whenshesatatherdeskonedaythe4cameintohermindtogodowntotheNewSchoolforSocialResearch.5shewaslearningtotrustherintuition直觉shedecidedtohaveago. Withoutanyforethoughtshetilledthe6‘FeeltheFearandDoItAnyway'.Susanwas7asshefacedthefirstsessionofthetwelve﹣weekcourse.Thetwohourswentwellbutshethenwaschallengedwitha8fearforshedidn'tknowwhattoleachthenextweek.Buteveryweekshefoundshehadmoretosay.Andher9levelgrew.Sherealizedshehadlearnedsomuchovertheyearsabout10fear.Andherstudentsweredrinkingitup.Attheendofthecoursetheywere11athowshiftingtheirthinkingreallychangedtheirlives. Susan12decidedtowriteabookbasedonthecourseshehadtaught.Shefacedmanyroadblocks.Andafterfouragentsandfifteen13fromvariouspublishersshe14puttheproposalinadrawer. Afterthreeyearsofwritingshewasgoingthroughthedrawerthat15hermuch﹣rejectedbookproposal.Pickingitupshehadan16sensethatsheheldsomethinginherhandsthatmanypeople17toread.Soshesetoutwithmuch18tofindapublisherwhobelievedinherbookthe19wayshedid.Thistimeshesucceeded.Shesucceeded20herwildestdreams. Shewassohappyshefollowedherheartandnevergaveupovercomingfearsthatstoodinherway. 1A.admitted B.wondered C.hesitated D.recognized 2A.help B.handle C.hatch D.have 3A.explained B.paused C.ignored D.agreed 4A.thought B.chance C.approach D.demand 5A.While B.Since C.If D.Though 6A.book B.talk C.speech D.course 7A.nervous B.energetic C.delicate D.depressed 8A.general B.constant C.pure D.new 9A.balance B.confidence C.happiness D.success 10A.handingover B.takingover C.gettingover D.lookingover 11A.relieved B.puzzled C.amazed D.amused 12A.eventually B.gradually C.originally D.temporarily 13A.rejections B.applications C.indications D.restrictions 14A.hopefully B.swiftly C.unconsciously D.unwillingly 15A.held B.emptied C.removed D.supported 16A.vague B.slight C.acute D.basic 17A.happened B.afforded C.agreed D.needed 18A.determination B.hesitation C.satisfaction D.imagination 19A.right B.ideal C.same D.obvious 20A.within B.beyond C.behind D.through
短周期元素XYZW的原子序数依次增大X的L层电子数是K层的3倍W所在族序数是周期数的2倍YZW的最外层电子数之和为10.下列说法正确的是
如图是由合成的一种路线图 已知①CH3CH=CH2CH3CHO+HCHO ②RCHO ③F为含有三个六元环的酯 ④X代表官能团. 请回答下列问题 1A的化学名称为B→F的反应类型是. 2E的结构简式为. 3由生成A的化学方程式为. 4B的同分异构体中含有苯环且苯环上有两个取代基一个取代基中含有酯基另一个取代基中含有醇羟基的结构有种其中核磁共振氢谱为5组峰且峰面积之比为32221的为任写一种结构简式. 5写出以CH3CH=CHCH3和CH2=CHCHO为原料制备的合成路线流程图无机试剂任选.合成路线流程图示例如下CH3CHOCH3COOHCH3COOCH2CH3
短周期主族元素XYZW原子序数依次增大其中只有YZ处于同一周期且相邻Z是地壳中含量最多的元素W是短周期中金属性最强的元素.下列说法正确的是
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由草本植物香料X合成一种新型香料H的路线如图ABDH的分子式巳标出 已知Ⅰ.A分子中含有苯环且核磁共振氢谱有6个峰Ⅱ.G能使溴的四氯化碳溶液褪色Ⅲ.H为含有三个六元环的芳香酯 请回答下列问题 1X的分子式为A的结构简式为F中所含官能团的名称为. 2写出反应③的化学反应方程式. 3H的结构简式为. 4F的同分异构体种类众多写出满足下列条件F的同分异构体的结构简式. ①遇FeCl3溶液发生显色反应②能与碳酸氢钠溶液反应③苯环上一氯代物只有一种 5设计由上图中的G为起始原料制备乙二酸的合成路线无机物任选注明反应条件.合成路线示例如下AB…
请阅读下面文字并按照要求用英语写一篇150词左右的文章. LiJiang1JanuarySunny It'sthattimeofyearagainTimetomakeNewYear'sresolutions.IthasbecomeatraditionformeandIhavecarriedonitforyears.EverytimeItickofftheresolutionsonthelistIamfeelingoncloudnine.IknowmylifehasarrivedatacrucialstageandIwillhavetogoalloutinthenewyear.NowIputdownmynewresolutionshere.FirstlyIneedtosharpenmywritingskillsSecondly… SuHua1JanuarySunny IfeltashamedofmyselfwhenIwasreviewingmypreviousresolutionsthismorning.ImakeresolutionseveryNewYear'sDay.HowevertheyDON'TWORK!WhathappensinJanuarystaysinJanuaryitrarelymakesittoJune.NewYearNewYou.I'lltryagainandturnoveranewleaf.AndthistimeIamcrossingmyfingersthatmynewresolutionswillbehelpful. 【写作内容】 1.用约30个词概括上面两段文字的主要内容 2.用约120个词谈谈你的观点内容包括 1新年表决心的意义用1﹣2个理由或论据支撑你的观点 2实现新年决心的做法至少两点. 【写作要求】 1.写作过程中不能直接引用原文语句 2.作文中不能出现真实姓名和学校名称 3.不必写标题. 【评分标准】 内容完整语言规范语篇连贯词数适当.
某多用电表内欧姆挡“×1”的内部电路图如图甲的虚线框所示.一学习小组将电阻箱和电压表并联后接到多用电表两表笔AB上采用图甲的电路测量多用电表欧姆挡“×1”正常工作时的内阻RΩ和其内部电池的电动势E电压表的内阻很大它在该电路中的分流作用可以忽略实验操作步骤如下 1先调整“指针定位螺丝”再将选择开关转至欧姆挡“×1”红黑表笔短接调节“欧姆调零旋钮”使指针指在表盘填左”或“右”侧零刻度处. 2电阻箱和电压表并联后的两端分别接在表笔A和B上正确的接法是电压表的正接线柱要接在多用电表的表笔填“A“或“B”上. 3改变电阻箱的阻值分别读出多组电压表和电阻箱的示数UR并将对应的和的值计算出来并记录在表格中再画出﹣图象如图乙所示若图乙中图线的斜率为k1与纵轴的截距为b1则所测内部电池的电动势E=欧姆挡“×1”正常工作时的内阻RΩ=.用k1b1表示 4一位同学提出了数据处理的另一种思路先计算出然后画U﹣图象如图丙所示.由图丙得到图线斜率为k2与纵轴的截距为b2则电池的电动势E=欧姆挡“×1”正常工作时的内阻RΩ=.用k2b2表示
Areyouhavingsomuchofworktofinishandareunabletokeepyourhomecleanandhealthy?Don'tworry.Roboticvacuumcleanersareheretohelpyouincleaning. TheroboticvacuumcleanersareoutfittedwithsensorsmotherboardWi﹣Fiandlaserstonavigateacrossthehomebythemselves.Theyaremadesosmallthattheyundoubtedlycreepunderthefurniturecupboardsbedscarpetsandsoantodetectandcleanthedust.Whereastheroboticvacuumcleanersdon'trequireanyhelpfromyouyoujustneedtosetitandthencarryonyourworksuchascookingpaintingofficeworketc.asitcanefficientlycleanwithoutanysupervision.Iftheirbatteriesdieofftheywillautomaticallygotothechargestationandgetcharged. Theroboticvacuumcleanersmakeverylittlenoisewhencomparedtothatofthestandardvacuumcleaners.Tocollectallthedirtandgrimethathasbeencleanedtheseroboticvacuumcleanerscomewithabuilt﹣inwastebin.Youcanwithnodifficultycleanthisinbuiltdustbinandcanreusethemagainandagain. Theproblematicthingwiththestandardvacuumcleaneristhatthevacuumbagsarecostlyandhastobereplacedoncein60days.Thatiswhyitisbesttoinvestyourmoneyinpurchasingtheroboticvacuumcleaner.Itspurchasepricemaybealittlehighbutonceyoubuyitthemaintenancecostwillbedecreasedwithsomanyotherbenefits. Therearedifferenttypesofroboticvacuumcleanersonthemarketrightnowindifferentsizes.Makeawisedecisionandbuythebestroboticvacuumcleanerthatcanfulfillallyourrequirementssothatyoucanbehappyandhygienic卫生的. 1TheunderlinedwordnavigateinParagraph2isclosestinmeaningto. A.plotthepath B.reducenoise C.collectinformation D.chargethebattery 2TheroboticvacuumcleanersbeatthestandardonesinthefollowingaspectsEXCEPTthat. A.theyarecheaperandsmallerinsize B.theycostlessformaintenance C.theymakelessnoisewhenworking D.theyaremoreintelligentandefficient 3WhichofthefollowingbestsummarizesParagraph2and3? A.Theoriginaldesignofroboticvacuumcleaners. B.Thetechnicaltheoryofroboticvacuumcleaners. C.Thefeaturesofroboticvacuumcleaners. D.Thefunctionsofroboticvacuumcleaners.
一个电子只在电场力作用下从a点运动到b点的轨迹如图中虚线所示图中一组平行实线可能是电场线也可能是等势面则以下说法正确的是
2018年2月13日平昌冬奥会女子单板滑雪U形池项目中我国选手刘佳宇荣获亚军.如图所示为U形池模型其中ac为U形池两侧边缘在同一水平面b为U形池最低点.刘佳宇从a点上方h高的O点自由下落由左侧进入池中从右侧飞出后上升至最高位置d点相对c点高度为.不计空气阻力下列判断正确的是
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玻璃半圆柱体横截面如图所示.O为圆心A为半圆形的最高点圆的半径为R.单色光束按如图方向沿截面入射到圆柱体上的B点方向与底面垂直∠AOB=60°.已知玻璃对该光的折射率n=不考虑光的反射求光束经底面折射后与AO延长线交点到O点的距离d.
用NA表示阿伏伽德罗常数的值下列说法正确的是
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I'mastoryteller.AndIwouldliketotellyouafewpersonalstories. IgrewupreadingBritishandAmericanchildren'sbooks.WhenIbegantowriteIwroteexactlythekindsofstoriesIwasreadingAllmycharacterswerewhiteandblue﹣eyedtheyateapplesandtalkedalotabouttheweatherdespitethefactthatIlivedinNigeria.Weatemangoesandwenevertalkedabouttheweather.BecauseallIhadreadwerebooksinwhichcharacterswereforeignIhadbecomeconvincedthatbooksbytheirverynaturehadtohaveforeignersinthem.ThingschangedwhenIdiscoveredAfricanbooks.BecauseofwriterslikeChinuaAchebeandCamaraLayeIwentthroughamentalshiftinmyideaofliterature.Irealizedthatpeoplelikemegirlswithskinthecolorofchocolatecouldalsoexistinliterature.IstartedtowriteaboutthingsIrecognized.SowhatthediscoveryofAfricanwritersdidformewasthisItsavedmefromhavingasinglestoryofwhatbooksare.TheyearIturnedeightwegotanewhouseboyFidefromanearbyruralvillage.Theonlythingmymothertoldusabouthimwasthathisfamilywasverypoor.AndwhenIdidn'tfinishmydinnermymotherwouldsayFinishyourfood!Don'tyouknow?PeoplelikeFide'sfamilyhavenothing.SoIfeltenormouspityforFide'sfamily.ThenoneSaturdaywewenttohisvillagetovisitandhismothershowedusabeautifullypatternedbasketthathisbrotherhadmade.Iwasastonished.Ithadnotoccurredtomethatanybodyinhisfamilycouldactuallymakesomething.Theirpovertywasmysinglestoryofthem. YearslaterwhenIleftNigeriatogotouniversityintheUnitedStatesmyAmericanroommateaskedwhereIhadlearnedtospeakEnglishsowellandwasconfusedwhenIsaidthatNigeriahappenedtohaveEnglishasitsofficiallanguage.WhatstruckmewasthisShehadfeltsorryformeevenbeforeshesawme.MyroommatehadasinglestoryofAfricaasinglestoryofcatastrophe. OfcourseAfricaisacontinentfullofcatastrophes.Butthereareotherstoriesthatarenotaboutcatastropheanditisveryimportantitisjustasimportanttotalkaboutthem.TheconsequenceofthesinglestoryisthisItrobspeopleofdignity.Itmakesourrecognitionofourequalhumanitydifficult.Itemphasizeshowwearedifferentratherthanhowwearesimilar. SowhatifmymotherhadtoldusthatFide'sfamilywaspoorandhardworking?WhatifwehadanAfricantelevisionnetworkthatbroadcastdiverseAfricanstoriesallovertheworld?WhatifmyroommateknewaboutmyNigerianpublisherMuhtarBakarearemarkablemanwholefthisjobinabanktofollowhisdreamandstartapublishinghouse?WhatifmyroommateknewaboutmyfriendFunmiIyandaafearlesswomanwhohostsaTVshowandisdeterminedtotellthestoriesthatweprefertoforget? MyNigerianpublisherandIhavejuststartedanon﹣profitcalledFarafinaTrustandwehavebigdreamsofbuildinglibrariesandprovidingbooksforstateschoolsandalsooforganizinglotsofworkshopsinreadingandwritingforallthepeoplewhoareeagertotellourmanystories. Storiesmatter.Manystoriesmatter.Storiescanbreakthedignityofapeoplebutstoriescanalsorepairthatbrokendignity.Whenwerealizethatthereisneverasinglestoryaboutanyplaceweregainakindofparadise. 1Whatisprobablypeople'sfirstimpressionofthewriterwhenitcomestohernationality? A.Shemainlyeatsapplesandmangoes. B.ShemaynotspeakfluentEnglish. C.Shecomesfromaplacefreeofcatastrophes. D.Sheprefersstoriesbasedonforeigncharacters. 2TheunderlinedphraseamentalshiftinParagraph2referstothewriter's. A.discoveryofAfricanbookswithcharactersofherskincolor B.acquaintancewithlocalAfricanwriterslikeChinuaAchebe C.realizationthatnotonlyforeigncharactersexistinliterature D.changethatshestartedtowriteaboutthingssherecognized 3Howmanypersonalstorieshasthewritermentionedinthepassage? A.Two. B.Three. C.Four. D.Five. 4Thewriterusesseveralsinglestoriesinthepassagetoillustratethatthesinglestory. A.mattersinkeepinglistenerswellinformed B.tendstoconveyaprejudicedideatolisteners C.getsincreasinglypopularamongstorytellers D.failstoproducealastingeffectonlisteners 5ThewriterlistsmanywhatifsinParagraph6to. A.emphasizeourdifferencesratherthansimilarities B.indicatethewaythatstoriesareusedtobreakdignity C.showthehardshipofrecognizingourequalhumanity D.stresstheimportanceoftellingdiversebalancedstories 6Whichofthefollowingcanbethebesttitleforthepassage? A.Thedangerofthesinglestory B.Theimportanceoftellingstories C.Thesinglestoriesthatmatter D.Storiesthatcanrepairbrokendignity
过氧化钙是一种白色固体常用作杀菌剂防腐剂. 1化学实验小组选用如图1装置部分固定装置略用钙和氧气制备过氧化钙. ①请选择必要的装置装置可重复使用按气流方向连接顺序为.填仪器接口的字母编号 ②连接好装置进行实验步骤如下 I.检查装置气密性后装入药品 II. III.点燃B处酒精灯加热药品反应结束后 Ⅳ.拆除装置取出产物. 2已知化学反应Ca2++H2O2+2NH3+8H2O═CaO2•8H2O↓+2NH4+.在碱性环境中制取CaO2•8H2O的装置如图2①装置B中仪器X的作用是反应在冰水浴中进行的原因是. ②反应结束后经低温烘干获得CaO2•8H2O.
氨基钠NaNH2是制取靛青染料肼和__等工业品的原料可将氨通过250﹣360℃金属钠制得.氨基納在空气中易氧化易燃与水强烈反应露置空气中易吸收水分和二氧化碳.某化学实验小组拟采用如图所示的装置制备氧基钠回答下列相关问题 1上面各装S组装为制取氨基钾装置时按气体流向合理的连接顺序为选填编号. Ⅰ.a﹣b﹣c﹣f﹣g﹣d﹣e﹣h﹣iⅡ.a﹣d﹣e﹣f﹣g﹣h﹣i﹣b﹣c Ⅲ.a﹣h﹣i﹣f﹣g﹣d﹣e﹣b﹣cⅣ.a﹣h﹣i﹣b﹣c﹣f﹣g﹣d﹣e 2仪器组装完成后下一步的換作名称是. 3A装置中加入试剂合理的是. a.浓氨水b.浓氨水与CaOc.NH4C1与CaOH2 简述A中产生氨气的原理. 4装置B的作用是答出两条. 5装置C中盛放的试剂为. 6下列实验操作步骤合理的顺序为用步骤序号填空. ①点燃D处酒精灯加热②打开分液漏斗活塞使产生气体并通入一段时间 ③充分反应后停止加热④关闭分液漏斗活塞 步骤②的目的是. 7为简化制备装置甲同学提出可用装有五氧化二磷的球形干燥管代替原装置的末端两个仪器乙同学认为甲的方案不可行乙的理由可能是.
五水硫代硫酸钠化学式为Na2S2O3•5H2O不溶于乙醇易溶于水可用于鞣制皮革矿石提银水产养殖医疗解毒等工业上常用Na2SNa2CO3为原料制备其生产流程如下图所示回答下列问题. 1五水硫代硫酸钠中硫元素的化合价为.常温下Na2S溶液的pH7选填“>”“<”或“=”. 2溶解原料的蒸馏水需加热煮沸一段时间后待用其目的是. 3Na2S和Na2CO3按物质的量比21投料后加热将SO2缓缓通入溶液中即可获得Na2S2O3反应的化学方程式为. 4上述制备实验一般须控制在碱性环境下进行若在酸性条件下产品会发黄用离子方程式表示其可能的原因. 5充分反应后趁热过滤将滤液水浴加热浓缩冷却析出后用乙醇洗涤表面即可获得纯净的无色透明晶体.趁热过滤和用乙醇洗涤的目的是. 6为测定产品中Na2S2O3•5H2O的纯度准确称取样品质量用适量的蒸馏水溶解加入指示剂用已知浓度的碘的标准溶液滴定.反应原理为2S2O32﹣+I2=S4O62﹣+2I﹣ ①加入的指示剂为填名称. ②滴定至终点时溶液颜色的变化. ③该实验中滴加标准碘液的操作正确的是填图1中对应操作的字母编号. ④下列操作可使产品纯度检测值偏髙的是选填编号. a.装标准液的滴定管水洗后未润洗 b.滴定过程中出现漏液 c.滴定结束时俯视读数
足够长的光滑细杆竖直固定在地面上轻弹簧及小球AB均套在细杆上弹簧下端固定在地面上上端和质量为m1=50g的小球A相连质量为m2=30g的小球B放置在小球A上此时AB均处于静止状态弹簧的压缩量x0=0.16m如图所示.从t=0时开始对小球B施加竖直向上的外力使小球B始终沿杆向上做匀加速直线运动.经过一段时间后AB两球分离再经过同样长的时间B球距其出发点的距离恰好也为x0.弹簧的形变始终在弹性限度内重力加速度取g=10m/s2.求 1弹簧的劲度系数k 2整个过程中小球B加速度a的大小及外力F的最大值.
乙酸乙酯是无色透明有刺激性气味的液体制备的实验装置如图所示.下列说法不正确的是
China'sChang'e4roboticprobeenteredlunarorbitonWednesdayamajorstepinitsmissiontomakeasoftlandingonthemoon'sfarside. A.marking B.tomark C.havingmarked D.marked
如图所示正方形abcd区域内有垂直于纸面向里的匀强磁场O点是cd边的中点.一个带正电的粒子重力忽略不计从O点沿纸面以垂直于cd边的速度射入正方形内经过时间t刚好从c点射出磁场.若只改变带电粒子射入磁场时的速度方向则下列说法中正确的是
如图粗细均匀的等臂U形管竖直放置其左管封闭有一定量的气体右管开口与大气相通左右两侧被水银柱隔开.平衡时测得左管内气柱的长度为l右管内水银面高于左管内水银面h.现从右管开口处用一不计厚度的活塞缓慢向下压气体已知活塞与管密封良好水银的密度为ρ大气压强为p0重力加速度为g.若整个过程中气体温度保持不变求活塞压下多少距离时左右两管水银面相齐平.
常温下向0.1mol•L﹣1二元弱酸H2A溶液中逐滴加入NaOH溶液H2AHA﹣A2﹣的物质的量分数随pH的变化如图所示下列叙述正确的是
﹣HiBob!Thanksalotforlendingmethemoney! ﹣!Ohbythewaytheinterestrateis10%. A.Withregards B.Withpleasure C.Nosweat D.Noway
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