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我国著名化学家侯德榜研究的侯氏制碱法的主要反应原理：NaCl+CO2+NH3+H2O＝NaHCO3↓+NH4Cl． 有关信息：①CO2+H2O⇌H2CO3⇌H++HCO3﹣，K1＝4.2×10﹣7...
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高三下学期化学《》真题及答案
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纯碱在玻璃洗涤剂等工业上广泛应用著名化学家侯德榜对改进它的生产技术做出杰出贡献运用侯氏制碱法制得的纯
下面是我国几位著名的化学家其中打破国外技术封锁潜心研究制碱技术发明联合制碱法的科学家是
侯德榜
张青莲
孙师白
张允湘
13.大理石的主要成分是填化学式下同改良酸性土壤所用的碱是我国著名化工专家侯德榜研究成功的侯氏制碱法
用化学用语填空1温度计中填充的液态金属是2我国著名化学家侯德榜发明的联合制碱法中的碱是指3碘酒中的溶
纯碱在玻璃洗涤剂等工业上广泛应用著名化学家侯德榜对改进它的生产技术做出杰出贡献运用侯氏制碱法制得的纯
我国化学家侯德榜创立的侯氏制碱法誉满全球其中的碱指纯碱也就是下列中的
氢氧化钠
碳酸氢钠
碳酸钠
氯化钠
下列叙述符合化学史事实的是
首先发现并制得氧气的是法国化学家拉瓦锡
发明联合制碱法的是我国化学家侯德榜
最早发现电子的是英国化学家道尔顿
世界上首先人工合成蛋白质和核糖核酸的国家是英国
20世纪20年代我国著名化学家侯德榜经过刻苦钻研终于制出纯碱他还撰写制碱一书将制碱的奥秘公诸于世打破
我国化学家侯德榜创立了著名的侯氏制碱法流程简图如图促进了世界制碱技术的发展.下列有关说法正确的是
沉淀池中的反应物共含有5种元素
过滤得到的“母液”中一定只含有两种溶质
图中X.可能是氨气
通入氨气的作用是使溶液呈碱性，促进二氧化碳的吸收，更多地析出沉淀
下面是我国几位著名的化学家．其中打破国外技术封锁潜心研究制碱技术发明联合制碱法的科学家是
侯德榜
张青莲
孙师白
张允湘
侯德榜是我国著名的化学家为纯碱和氮肥工业技术的发展做出了杰出的贡献他发明的侯氏制碱法大大提高了原料的
侯德榜是我国著名的化学家由他发明的侯氏制碱法制得的纯碱中可能含有少量氯化钠现取仅含氯化钠杂质的纯碱样
从固体烧碱纯碱盐酸氢氧化钙浓硫酸中选出合适的物质填入相应的空格中写化学式.可用来配制石硫合剂的是可用
我国化学家侯德榜创立的侯氏制碱法其中的碱指纯碱即
氢氧化钠
碳酸氢钠
碳酸钠
氯化钠
下面是我国几位著名的化学家其中打破国外技术封锁潜心研究制碱技术发明联合制碱法的科学家是-------
侯德榜
张青莲
戴安邦
鲁嘉锡
我国化学家侯德榜创立了著名的侯氏制碱法流程简图如下促进了世界制碱技术的发展下列有关说法正确的是
沉淀池中反应物共含有六种元素
过滤得到的“母液”中一定只含有两种溶质
图中X.可能是氨气
通入氨气的作用是使溶液呈碱性，促进二氧化碳的吸收，更多地析出沉淀
我国著名化学家侯德榜的侯氏制碱法对传统的纯碱生产技术进行大胆革新成为当时世界上最先进的制碱法纯碱是重
化合反应
分解反应
复分解反应
置换反应
纯碱在玻璃洗涤剂等工业上广泛应用著名化学家侯德榜对改进它的生产技术做出杰出贡献运用侯氏制碱法制得的纯
侯德榜是我国著名的化学家由他发明的侯氏制碱法制得的纯碱中可能含有少量氯化钠现取仅含氯化钠杂质的纯碱样
我国著名化学家侯德榜发明的联合制碱法中的碱是指可用于改良酸性土壤的碱.
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圆x2+y2＝1与直线y＝kx﹣3有公共点的充分不必要条件是
Peopledohavedifferentideasaboutwhat1wear.Whileyoungpeopletendtoconsidermoreaboutfashionpersonalityandhowtheylookwhen2chooseclotheselderlypeoplepay3greatattentiontowhethertheyappearrighttheyfeelcomfortableaswellaswhetherthematerialisworth4price.Howpeoplegetdressedalsochangesovertime.TakeChina5anexample.Inthe1960'sand1970'stherewerepracticallyonlytwoorthreecolorspeoplewore﹣bluegreenandgray.Thestylesoftheclothes6bealsoverydull.Inthe1980'syoungpeoplewouldonlywear7wasinfashion.8recentwehavecometounderstandthatthewayyoudress9youisareflectionofyouroccupationyourbackgroundandyourpersonality.Soweseedifferentpeopleweardifferentclothesaccordingtooccasionstheirlikesand10feel.
已知a＞0b＞0且ABC三点在同一条直线上则的最小值为．
已知函数fx是奇函数且fx≠0gx＝若g1＝﹣1则g﹣1等于
已知||＝2||＝1与的夹角为60°则+2﹣3的值等于
WhenIwasyoungmyfatherhadoneofthefirsttelephonesmourneighborhood.Iremembertheshinyboxonthewall.ButIwastoolittletoreachit.Icouldonlylistentomymothertalkonit.Idiscoveredthatinsidethe﹣wonderfulboxlivedanamazingpersonwhosenamewasInformationPlease.Therewasnothingshedidnotknow.Onedaymymotherwentout.IaccidentallyhurtmyfingerwhenIwasplayingwithahammer.Iwalkedaroundthehousesuckingmyfingerfinallyseeingthetelephone.QuicklyIdraggedachairoverandclimbedup.'InformationPlease'Ispokeintothereceiver.Aclickortwoandasmallclearvoicespokeintomyear.'Information.''Ihurtmyfinger'Icriedintothephone.'Isn'tyourmotherhome?'camethequestion.'Nobody'shomebutme.'Isobbed.'Areyoubleeding?'thevoiceasked.'No'Ireplied'Ihitmyfingerwiththehammerandithurts.''Canyouopenyouricebox?'sheasked.IsaidIcould.'Thentakealittlepieceoficeandholdittoyourfinger.'saidthevoice.AfterthatIcalled'InformationPlease'foreverything.IaskedherforhelpwithmygeographyandshetoldmewherePhiladelphiawas.Shehelpedmewithmymath.ShetoldmehernamewasSally.Thentherewasthetimemypetcanary金丝雀died.Icalled'InformationPlease'andtoldSallythesadstory.'Whyisitthatbirdssingsobeautifullyandbringjoytoallfamiliesonlytoendupasapileoffeathers?'Shelistenedthensaidquietly'Paulalwaysrememberthatthereareotherworldstosingin.'SomehowIfeltbetter.OnedaywhenIcalled'InformationPlease'againadifferentvoiceanswered'Information.'IaskedforSally.'Areyouafriend?'shesaid.'Yes'Ianswered.'I'msorrytohavetotellyouthis'shesaid.'Shediedfivedaysago.'BeforeIcouldhangupshesaid'Waitaminute.DidyousayyournamewasPaul?''Yes.''WellSallyleftamessageforyou.Thenotesaid‘TellhimIstillsaythereareotherworldstosingin.He'llknowwhatImean.''Ithankedherandhungup.IknewwhatSallymeant.1.Whentheauthorhurthisfingerherangbecause.A.hebelievedthatthetelephonekneweverythingB.thetelephonecouldtellhimadoctor'snumberC.hismotherwasontheotherendofthetelephoneD.hewasoncetoldtoaskforhelpinthisway2.ThroughthehelpfromSallyitcanbeinferredthat.A.SallywasageographyteacherB.Sallywastheauthor'sfriendC.SallywasaconsideratepersonD.Sallywasanimaginaryperson3.WhatdidSallyreallymeanbyhermessage?A.Shewassurethatshecouldsinginotherworlds.B.Shedidn'twantPaultobesadaboutherdeath.C.SinginghelpedPaultofacedeathmoreeasily.D.TherewasnoneedforPaultocallheranymore.4.Whatisthebesttitleforthispassage?A.MyPet'sDeathB.AnAmazingWomanC.AHealingMessageD.MyMagicBox
若函数在区间12上单调递减则实数a的取值范围为
设函数fx＝|2x+1|﹣|x﹣2|． 1求不等式fx＞2的解集 2若恒成立求实数t的取值范围．
设△ABC的三个内角ABC所对的边长分别为abc．平面向量＝cosAcosC＝ca＝2b0且•﹣＝0 1求角A的大小 2当|x|≤A时求函数fx＝sinxcosx+sinxsinx﹣的值域．
ManyofusremembercloneddinosaursrunningwildinthefilmJurassicPark.Andtheideaofusingtechnologytoreviveextinctspecieshaslongfascinatedwritersdirectorsandscientists.AccordingtoTheTelegraphwoollymammoths长毛猛玛象maywalktheearthoncemorenowthatscientistshavetakenanothersteptowardrealizingalong﹣helddream﹣recreatingtheirDNA.Mammothsbecameextinctaround10000yearsago.HoweversincethediscoveryofnearperfectpreservedremainsinArcticpermafrost北极冻土带inMay2013avarietyofresearchstudieshavebeencarriedoutsince.GeneticistsanalyzedDNAfromtheremainslookingforgeneswhichseparatedmammothsfromelephantssuchashairinessandearsize.Theythenusedtheresultstoreproduceexactcopiesof14mammothgenes.'Itisthefirsttimethatmammothgeneshavebeenalive﹣althoughsofarithasonlybeendoneinthelab'GorgeChurchleadresearcheroftheprojecttoldtheSaturdayTimes.ChurchthenusedanewtechniquewhichallowsscientiststoeditDNAcarefullyreplacingsectionsofelephantDNAwiththemammothgenes.So'wenowhavefunctioningelephantcellswithmammothDNAinthem'hesaid.HoweverChurchruledoutthepossibilityofbringingthemammothsbacktolifeviacloningfromfrozenremains.Hesaidhe'preferredtofocusonrebuildingthefullmammothgenomebyanalyzingDNAfrompreservedremainsandputtingitintothecellsofitsclosestlivingrelative﹣theAsianelephant'reportedTheTelegraph.Churcharguedthatthereturnofthewoollymammoths﹣orratherthereturnofsomethingverysimilar﹣couldhelpbringbackfragile脆弱的ecosystems.Howeversomescientistsbelievethatbringingbackthemammothwouldbeunethical.'What'sthemess?Wecanbeasirresponsiblewiththeenvironmentaswewantthenwe'lljustclonethingsback?'AlexGreenwoodanexpertonancientDNAtoldtheSundayTimes'Moneywouldbebetterspentfocusingonconservingwhatwedohavethanspendingitonananimalthathasbeenextinctforthousandsofyears.'1.Whatcanweinferfromthepassage?A.Scientificstudiesonrevivingextinctspeciesdidn'tbeginuntilMay2013.B.Thetechnologytoreviveextinctspeciesisalreadymature.C.ChurchandhiscolleaguestriedtoreproducemammothDNA.D.Churchmanagedtolistallthegenesseparatingmammothsfromelephants.2.AccordingtothetextwecouldconcludethatChurch.A.hadseriousdoubtsaboutdiscoveringthefullmammothgenome.B.aimedtoclonetheextinctmammothfromfrozenremainsonhisown.C.couldhelpsavefragileecosystemifbingingbacksomethingsimilartothemammoth.D.believetheirsuccessfulexperimentcouldchangetheAsianelephantintomammoths.3.AlexGreenwoodbelievesthat.A.itisunnecessarytoworryabouttheextinctionofAsianelephantsatpresent.B.it'snecessarytobringbackspeciesbeneficialtohumansfromextinction.C.thereturnofthewoollymammothwouldhelptobalanceecosystems.D.it'smoreimportanttoprotectpresentspeciesthantobringbackextinctones.4.What'sthebesttitleofthepassage?A.Mammothscouldreturn?B.Mammoths'returnhelpsecosystems.C.Mammothshavebeenextinctforages.D.Mammoths'clonefromfrozenremains.
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.作文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改.增加:在缺词处加一个漏字符号∧并在其下面写出该加的词.删除:把多余的词用斜线\划掉.注意:1.每处错误及其修改均仅限一词;2.只允许修改10处多者从第11处起不计分. RecentlywehavehadadiscussionaboutthatChinashouldmakeeveryefforttodevelopingcarindustry.Opinionsdividedonthequestion. 60%ofthestudentsholdthebeliefthatChinashouldfulldevelopcarindustry.Itwillnotonlypromoteeconomicdevelopmentbutprovidesmorejobstoworkersaswell.Besidecarscanhelptosavetimeandimprovepeople'slifequality.Ontheotherhand40%thinkChinashouldlimittheircarindustrydevelopment.Otherwisethecitytrafficwillbemuchmoreheavierandmoretrafficaccidentwilloccur.Asaresultnewroadswillbebuiltbutoccupymorefarmland.
为买一双运动鞋而通宵排队有意义吗?point.
假如你是李华下周有个美国学生代表团来访学校安排你接待并带领他们参加学校内的活动体验中国剪纸艺术.请根据以下要点向他们作一个简短的介绍. 1活动的主题:福和喜二字; 2福和喜的寓意用途 3分组活动 注意:1词数100左右 2可以适当增加细节.以使行文连贯 3口头语已为你写好 Dearfriendswe'rehonoredtowelcomeyoutoourschool.Today
抛物线y2＝4x的焦点坐标是
Whetherit'sjoiningaschoolclubgoingtoafriend'sbirthdaypartyortravellingbytrainwecanmeetnewpeopleanywhereandanytimeinourlives.Howevermanyofusfeelawkwardwhenmeetingpeopleforthefirsttimeespeciallywhenwearen'tquitesurewhattosay.Thesituationfeelscoldevenicy.'Breakingtheice'isatermwidelyusedintheEnglish﹣speakingcountriestodescribeasmalltalktechniquethatcanhelprescueaconversationfromcertainfailure.Sowheredoyouevenbegin?Wellagoodstartistoacceptthatitisperfectlynormaltofeelalittlenervouswhentalkingtosomeoneforthefirsttime.Theymightlookgrumpyorscarybuttheycouldturnouttobethenicestpersonyou'veevermet.Youmightthinkthatbreakingtheiceisdifficult.Butsometimesjustasimple'hello'followedbyathree﹣secondsmilecanmakeallthedifference.Complimentingsomeoneontheirgarmentoraccessories饰品isalsoagreateasywaytobreaktheice.Youmightsay:'Iloveyourjacket.Wheredidyoubuyitfrom?'Beinginanuncomfortableorunpleasantsituationwithsomeonenewmightfeelterriblebutitcanactuallybeoneofthebesticebreakers.Byfocusingonthesituationyoucometogethertofightthecommonenemy:thelongbathroomqueueforexampleortheovercrowdedbus.Youcanmakeobservationstoo.'Whatkindofdrinkisthat?''That'salovelyname.Whatdoesitmean?''Doyoustudyheretoo?'Thereareopportunitiesallaroundyoutoaskquestionsthatdon'tseemweirdaslongasyouhavesomefollow﹣upquestionsinmind.Ifyou'refeelingextraboldmakeajoke.Jokescanbedifficulttomasterbutifyougetthemrighttheyshowthelikeablewittysideofyourcharacter.'What'syourname?''WellpeopleusuallycallmeMikebutyoucancallmetonight.'1.Whichisthebesttitleforthepassage?A.HowtodevelopfriendshipwithastrangerB.AdviceonbreakingtheicewhenwecommunicatewithastrangerC.HowtobecomeasuccessfulpublicspeakerD.Howtostartaconversationwithaperson2.Theunderlinedword'grumpy'canbereplacedby.A.easilyannoyedB.gentleC.low﹣spiritedD.cheerful3.Whatcanwelearnfromthepassage?A.'Breakingtheice'isasmalltalktechniquewidelyusedinourdailycommunicationallovertheworld.B.Aslongasyoucansmileatothersyouwillmakesomefriends.C.Realizingthatit'snormaltofeelnervousinfrontofastrangerisagoodstarttobreaktheice.D.Beinginanuncomfortablesituationwithsomestrangerscanbethebesticebreakers.4.Accordingtothepassagemakingajoke.A.canbedonewithease.B.leadstomanynewfriends.C.canshowyourwisdomandlovelycharacter.D.makesyouenjoyyourlifehappily.
设向量＝﹣12＝m1若向量与2平行则m＝
我真希望自己的文章有朝一日能见报.hope.
已知复数为纯虚数其中i是虚数单位a为实数则a的值为
Advancesinhealtheducationanddiseasepreventionandtreatmentsaremakinghumanlifelonger.Butwhatyoumaynotknowisthatsomeseeminglyunimportantthingscanalsoinfluencehowlongandhowwellyou'lllive.Hereisthelatestresearchonlongevitysigns.Sign1:YourMomHadYouYoungIfshewasunderage25you'retwiceaslikelytoliveto100assomeoneborntoanoldermom.Theythinkthatyoungermomsproducehealthierbabies.Sign2:You'reaTeaLoverBothgreenteaandblackteacontaincatechins儿茶酚somethingthathelpsbloodvessels血管relaxandprotectsyourheart.Sign3:You'dRatherWalk'Fit'people﹣definedasthosewhowalkforabout30minutesaday﹣aremorelikelytolivelongerthanthosewhowalkless.Sotakeawalkduringyourlunchhourdoexercisearoundthefieldwhileyourkidisatsoccerpractice﹣trybyhookorbycrooktomovealittlemoreeveryday.Sign4:YouHaveStrongLegsLower﹣bodystrengthtranslatesintogoodbalanceflexibilityandpowerwhichasyougetolderplayanimportantpartinreducingyourriskoffallsandinjuriesleadingtobetterhealth.Nowyouseeitisnecessarytostrengthenyourlower﹣body.Butthequestionis:how?1.WhichofthefollowingisTRUE?A.Greenteacontainsmorecatechinsthanblacktea.B.Generallytheyoungerthemomsthehealthierthebabies.C.Themoreyouwalkthelongeryoulive.D.Low﹣bodystrengthisthemostimportantfactorforlongevity.2.Theunderlinedphraseisclosestinmeaningto''.A.tryanypossiblemeansB.usesometoolsC.choosecarefullyD.Workoutnewways3.Accordingtothetextyourlongevityisaffectedbythingssuchas.a.lower﹣bodystrengthb.diseasetreatmentsc.yourmom'saged.livinghabitsA.abcB.acdC.abdD.bcd4.Whatisthepassagemainlyabout?A.Howadvancedsciencehelpspeoplelivelonger.B.Howwomengivebirthtohealthybabies.C.Signsthattellyouyourhealthcondition.D.Thenewdiscoveriesoflongevitysigns.
设函数fx＝﹣a2lnx+x2﹣axa∈R． 1试讨论函数fx的单调性 2如果a＞0且关于x的方程fx＝m有两解x1x2x1＜x2证明x1+x2＞2a．
已知点M的坐标xy满足不等式组N为直线y＝﹣2x+3上任一点则|MN|的最小值是
It'sthetimeofyearwhengraduatesarelookingforwardtoputtingconstantexamsbehindandmovingontoamoreexcitingstageoftheirlives.Butinthedigitalagenoteverythingissoeasilyleftbehindbecausetheyhavecreatedadigitalfootprintthat'softennoteasytocoverup.Howevertherearevariousactionstheycantaketomakethatonlinepresence网络形象moreappreciating.1CleanupyourFacebookaccountCleanupyourFacebookpageandgetridofanythingthatcouldbeconsideredoffensive冒犯的无礼的orheldagainstyou.Rememberthetestisnolonger'Wouldyouwantgrandmatoseeit?'but'2'Useaprofessionallookingphoto3somakesurethatfirstimpressionisagoodone.Againwhatworkedatschoolisunlikelytoimpresstheemployers.Alsobeconsistent一致的andusethesamephotoonallyouronlineplatforms.4Whileit'simportanttomakethetransition过渡fromschooltotheworkplaceyoudon'twanttoleaveeverythingbehind.Makeapointofkeepingintouchwithyourschoolfriendsteachersprofessorssportscoachesoranyonewhocouldbehelpfultoyouasyouestablishacareer.BeyourselfNobodycanbemorelikeyouthanyou.5Turnyoursocialnetworkingpagesintoyourownpersonalwebsiteandstartmarketingyourownindividualbrand!A.GrowyournetworkB.SearchyourmemoryC.ApictureisworthathousandwordsD.Whomwouldyouwanttoseeit?E.Wouldyouwantafutureemployertoseeit?F.Makesureyouronlinepresenceisrepresentativeofwhoyoureallyare.G.Hereareafewsuggestionsthatyoumightwanttopasson.
变量xy之间的一组相关数据如表所示 若xy之间的线性回归方程为＝x+12.28则的值为
若函数为奇函数则实数a＝．
若则|z|＝
我阿姨苦读四年之后获得了文凭那一刻她欣喜万分.Themoment….
在等比数列{an}中“a4a12是方程x2+3x+1＝0的两根”是“＝1”的
ItwasthesecondtimethatIhavebeentothehospital.1itwasaweekdaytherewerestilllotsofpeopletherewhich2meatfirst.Mostofuslivehealthylivessoperhapsweneverrealizethattherearesomanypeople3painandtorment.AsIwalkedalongthehallwayIsawavarietyofpeopleandfeltmanythings4throughmymind.Iheardasmalllaughofjoyand5myheadtoseewhathadhappened.Awomanwasstandinginthehallwaysayingtoherhusbandbeside:'6isokay!Yourbabyismovingaroundlikealwaysinmybelly肚子.'Themansmiledandsaid:'Ourchildmusthavea7likemine.'Theysmiledateachotherandwalked8away.Asmallnew9makessomanypeoplesohappy.Iwas10whymyparentsalwayslookedso11whenItoldthemthatIfeltunwell.Parents12theirchildren'slivesmoredearlythantheirown.Anothernoise.Iheardanursesay:'Weare13theoperation.Don'tworry.'AnoperationissomethingthatIhavefearedeversince14.Ifearthe15ofit.Ifanoperationis16everybodyishappy.Butifnottheworldseemsto17.Afterallweknowthepeoplearounduswillleaveourworld18.Facingtheforcesoflifeanddeathweareas19asdropsofwaterinanoceanonlytheretobepushedbackandforth.Ifeltmyself20inthatexactmomentandplaceinmydeepestthoughts.1.A.As B.Because C.Although D.When2.A.frightened B.excited C.worried D.surprised3.A.goingfor B.goingthrough C.goingover D.goinginto4.A.flash B.appear C.form D.fly5.A.held B.raised C.rose D.kept6.A.Nothing B.Something C.Anything D.Everything7.A.hobby B.behavior C.character D.movement8.A.quietly B.happily C.sadly D.hurriedly9.A.life B.boy C.daughter D.person10.A.realized B.told C.recognized D.reminded11.A.down B.unhappy C.worried D.nervous12.A.see B.treat C.look D.think13.A.getting B.experiencing C.doing D.carrying14.A.childhood B.fatherhood C.adulthood D.neighborhood15.A.danger B.failure C.certainty D.uncertainty16.A.good B.successful C.quick D.easy17.A.darken B.change C.brighten D.stop18.A.early B.temporally C.permanently D.quickly19.A.abundant B.important C.necessary D.unimportant20.A.growup B.riseup C.growold D.growcrazy
函数fx＝sinωx+φω＞0|φ|＜的部分图象如图所示将y＝fx的图象向右平移个单位长度后得到函数y＝gx的图象． 1求函数y＝gx的解析式 2在△ABC中角ABC满足2sin2＝gC++1且其外接圆的半径R＝2求△ABC的面积的最大值．
圆x2+y2﹣2x﹣8y+13＝0的圆心到直线ax+y﹣1＝0的距离为1则a＝
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