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苯乙烯是一种重要的化工原料，可采用乙苯催化脱氢法制备，反应如下： （g）+H2（g）△H＝17.6kJ•mol﹣1 （1）在刚性容器中要提高乙苯平衡转化率，可采取的措施有 （2）实际生产...
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高三下学期化学《》真题及答案
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乙苯脱氢制苯乙烯的绝热反应器和脱氢条件有哪些改进措施
乙苯催化脱氢生产苯乙烯的过程考虑到能源消耗及反应系统压力等因素水蒸汽和进料乙苯的质量比通常控制在以上
1.3：1
2.3：1
3.2：1
3.7：1
目前工业上乙苯催化脱氢合成苯乙烯的反应器型式有两种
升温反应器
多管等温型反应器
绝热反应器
多段温控反应器
已知脱氢反应乙苯转化率为63.7％苯乙烯选择性为95.71％求苯乙烯收率
乙苯催化脱氢生产苯乙烯的过程一般采用的反应器为
绝热床
等压床
流化床
等温床
已知通入苯乙烯反应器的原料乙苯量为l000kg／h苯乙烯收率为40％以反应乙苯计的苯乙烯选择性为90
乙苯催化脱氢生产苯乙烯是一个体积增加的反应为使反应更好地向增加苯乙烯的方向进行一般将加入到反应系统中
氮气
二氧化碳
过热水蒸汽
一氧化碳
乙苯催化脱氢制苯乙烯过程比较采用1水蒸汽2氢气3氮气作为稀释气体的优劣排序并简单说明原因
乙苯催化脱氢制苯乙烯反应下列说法中不正确的是
乙苯的一氯代物共有3种不同结构
苯乙烯和氢气生成乙苯的反应属于加成反应
苯乙烯分子中所有原子有可能位于同一平面上
等质量的苯乙烯和聚苯乙烯燃烧耗氧量相同
乙苯脱氢反应催化剂的选取应有利于反应生成
甲苯
苯乙烯
α－甲基苯乙烯
异丙苯
异丙苯是一种重要的有机化工原料根据题意完成下列填空⑴由苯与2－丙醇反应制备异丙苯属于反应由异丙苯制备
异丙苯[]是一种重要的有机化工原料根据题意完成下列填空1由苯与2丙醇反应制备异丙苯属于______
异丙苯是一种重要的有机化工原料根据题意完成下列填空1由苯与2丙醇反应制备异丙苯属于________
脱氢反应器进料水油比为1.35其中混合乙苯中苯乙烯含量为0.3％反应器出口液相组成wt为水56.3％
脱氢反应器进料水油比为1.35其中混合乙苯中苯乙烯含量为0.3％反应器出口液相组成wt为水56.3％
乙苯脱氢氢制苯乙烯氨合成等都采用催化反应器
固定床
流化床反应器
釜式反应器具
鼓泡式反应器
苯乙烯的生产方法有几种乙苯脱氢制苯乙烯分哪两步
目前工业上乙苯催化脱氢合成苯乙烯的反应器型式有多管等温型反应器和两种
工业上可由乙苯生产苯乙烯下列说法正确的是
该反应的类型为消去反应
乙苯的同分异构体共有三种
乙苯和苯乙烯都能与溴水发生反应
可用酸性KMnO
4
溶液鉴别乙苯和苯乙烯
目前工业上乙苯催化脱氢合成苯乙烯的反应器型式有哪两种其主要区别是什么
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Youcanseldomseehomelesspeopleonthestreet.Sowhatcouldyoudoifyouwanttohelpthem?Herearesomeways. Donate捐赠money.Theeasiestwaytohelpthehomelessistodonateyourmoney.Whenyouwanttodothatyoucandonateyourmoneytolocalorganizations.Mostcharityorganizationsknowwherethemosthelpisneeded. Donatethings.Donatingyourusedornewthingsisanothereasywaytohelp.Donatethesethingstolocalorganizationswhichhelpthehomelessorgivethemtohomelesspeopleyouseeoften.Thebestthingstodonateincludethingslikeprofessionalclothingnewsocks… Providefood.①Therearelotsofwaysthatyoucanhelphomelesspeoplegetfood.Youcandonatefreshfruitsandvegetablestolocalsoupkitchens.Youcanalsodropoffbananasapplesorsandwiches. Callemergency紧急services.Ifyouseesomeonewhomaybeadangertothemselvesorotherscallemergencyservices.②Ifsomeoneisclearlyhavingaseriousproblemcallforhelpalso.IfsomeoneisindangerbecauseofweatherconditionscallEmergencyServicesalso. 1根据短文内容简要回答问题 1Whatistheeasiestwaytohelpthehomeless? 2Wherecanyoudonateyourusedornewthings? 2①和②将短文中画线的句子译成汉语. ① ② 3请给短文拟一个适当的标题.
计算﹣12019+×sin60°﹣﹣3．
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下列说法正确的是
某公司有如图所示的甲乙丙丁四个生产基地．现决定在其中一个基地修建总仓库以方便公司对各基地生产的产品进行集中存储．已知甲乙丙丁各基地的产量之比等于4542各基地之间的距离之比abcde＝23433因条件限制只有图示中的五条运输渠道当产品的运输数量和运输路程均相等时所需的运费相等．若要使总运费最低则修建总仓库的最佳位置为
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分解因式x2+2x+1＝．
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为了测量某山如图所示的高度甲在山顶A测得C处的俯角为45°D处的俯角为30°乙在山下测得CD之间的距离为400米．已知BCD在同一水平面的同一直线上求山高AB．可能用到的数据≈1.414≈1.732
Theaimoftheseexperimentswastofindtheconnectionifanybetweenthetwo现象.
下列运算正确的是
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ScottandDanielHarryareenjoyingeverydaytaskslikeshoppingandwashingforthefirsttimefollowingtheirmovetoanaccommodation住宿supporthouseinKurwongbahnorthofBrisbanelastyear. DisabilityServicesQueensland'sStrengtheningNon﹣GovernmentOrganisationsprojectprovidedanaccommodationsupportmodelthatwouldenableresidents居住者likeDanielandScotttolivemoreindependently. Thehouseisjustoneofmanyaccommodationsupportservicesfunded资助throughtheproject.Thefive﹣bedroomhouseprovides24﹣hourcareforuptofourindividualswithcomplexneedsincludingmedicalsupport.Careandstaffinglevelsarevariedandflexibledependingoneachresident'srequirements. ScottandDanielwhohaveasevereformofDuchenneMuscularDystrophyrequire24﹣hoursupportinallactivitiesofdailyliving.Beforetheymovedtothehousetheylivedwiththeirfamily.Scottsayslivingathomewasdifficultasitplacedaphysicalandemotionalstrain负担ontheirparentswhohadtowakethemseveraltimeseachnighttorepositionthemorplacethemonbreathingmachines. WewereheavyheartedsaysScottwhoisplanningtowriteabookabouthislifeexperiences.Butourparentsnowhavealotmoretimeforthemselves.Wenowmanageourselvesonaday﹣to﹣daybasis. Danielisanenthusiasticgardenertakingcareofhisownvegetablegarden.Themensharethehousewithoneotheryoungmanandtheygotorugbyleaguegamesmeetingupwithfriends. LeedingCareAustraliaprovidesthecareserviceatKurwongbah.ManagerLeeGarnisssayssettingupthefacilities设施hasnotbeenwithoutitschallenges. ItisanunconventionalmodelofcareLeesays.ThehomeisScottandDaniel'shomehoweveritisalsoaworkplacefortheirsupportstaff.Balancingthesetworequirementshasbeenachallengeforall. Wehaveexperiencedabitofalearningphaseoverthelasttwelvemonths.HoweverbyworkingasateamwetryourbesttomeettheneedsofbothresidentsandstaffandIthinkwehaveachievedtherightbalance. 1WhatdoweknowaboutthehouseScottandDanielliveinnow? A.Itwasbuiltbytheirparents. B.Itcanaccommodatefourresidents. C.Itbelongstoagovernmentalproject. D.It'slocatedinthecenterofBrisbane. 2WhydidScottandDaniel'sparentswakeupfrequentlyatnight? A.Tohelpthemdoexercise. B.Theyweremakingalotofnoise. C.Tocheckontheirbreathing. D.Theywereunderemotionalpressure. 3HowdidScottfeelwhilelivingwithhisparents? A.Abitguilty. B.Quitehappy. C.Veryproud. D.Slightlyangry. 4Whatwasachallengewhilesettingupthefacilities? A.Lackoffund. B.Noworkplace. C.Inexperiencedstaffmembers. D.Satisfyingbothstaffandresidents'needs.
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PeteRosethefamousbaseballplayerwhomIhavenevermettaughtmesomethingsovaluablethatitchangedmylife.PetewasbeinginterviewedinspringtrainingtheyearhewasabouttobreakTyCobb'sall﹣timehitsrecord.OnereporteraskedPeteyouonlyneed78hitstobreaktherecord.Howmanyat﹣ bats轮到击球doyouthinkyou'llneedtogetthe78hits?WithouthesitationPetesaid78.ThereporteryelledbackAhcomeonPete.Youdon'texpecttoget78hitsin78at﹣batsdoyou? Mr.Rosecalmlysharedhisruleinlifewithallthereporterswhowereanxiouslyawaitinghisreply.EverytimeIstepuptotheplateIexpecttogetahit！IfIdon'texpecttogetahitIhavenorighttostepinthebatter'sboxinthefirstplace！IfIgouphopingtogetahitthenIprobablydon'thaveaprayerofgettingahit.Itisthepositiveexpectationthathasgottenmeallofthehitsinthefirstplace. WhenIthoughtaboutPeteRose'sruleandhowitwasappliedtoeverydaylifeIfeltalittleembarrassed.AsabusinesspersonIwashopingtomakemysalesmeetthequotas定额.AsafatherIwashopingtobeagooddad.AsamarriedmanIwashopingtobeagoodhusband.ThetruthwasthatIwasanadequatesalespersonIwasnotsobadasafatherandIwasanokayhusband.Iimmediatelydecidedthatbeingokaywasnotenough!Iwantedtobeagreatsalespersonagreatfatherandagreathusband.Ichangedmyattitudetooneofpositiveexpectationsandtheresultswereamazing.IwasfortunateenoughtowinafewsalestripsIwonCoachoftheYearinmyson'sbaseballleagueandIsharedalovingrelationshipwithmywife！ThanksMr.Rose! 1WhichofthefollowingsayingscanmostappropriatelybeusedtodescribeMr.Rose'srule? A.Hewhodoesn'twanttobeageneralcan'tbeagoodsoldier. B.Beforeeverythingelsegettingreadyisthesecretofsuccess. C.Ifyouworkhardenoughyourdreamswillcometrue. D.Romewasnotbuiltinoneday. 2WhatcanbeinferredaboutPeteRosefromthepassage? A.Hewasgeneroustoshareallhisruleswitheveryone. B.Hegotallthehitshewantedbecauseofgoodluck. C.Hesethimselfagoalofbeingthebest. D.Helikedtodreamofsomethingimpossible. 3BysayingIwasanadequatesalespersoninPara.3thewriterprobablymeans. A.hecouldmakeadequatemoneyasasalesperson B.hedidn'tdoanexcellentjobasasalesperson C.hewasgoodenoughtobeasalesperson D.heknewhowtosellgoodsinaproperway
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Itisatruethatyoucan'tjudgeabookbyitscover.
WantedSomeoneforaKiss We'relookingforproducerstojoinusinthesecondofLondon100FM.You'llworkonthestation'smusicprogrammes.Musicproductionexperienceinradioisnecessaryalongwithrichknowledgeofmoderndancemusic.Pleaseapply申请inwritingtoProducerVacanciesKiss100. FatherChristmas We'relookingforaveryspecialpersonpreferablyover40tofillourFatherChristmassuit. WorkingdaysEverySaturdayfromNovember24toDecember15andeverydayfromDecember17toDecember24exceptSunday1030﹣1600 Excellentpay. Pleasecontact联系theEnterpriseShoppingCenterStationParadeEastbourne. AccountantsAssistant WhenyoujointhetheminourRevenueAdministrationUnityouwillbeprovidingassistancewithinallpartsoftheRevenueDivisiondealingwithpostandothergeneralduties.IfyouareeducatedtoGCSEgradeClevelwewouldliketotalktoyou.Thispositionisequallysuitableforaschoolleaverofforsomebodywhohasofficeexperience. WealdenDistrictCouncil SoftwareTrainer Ifyouareaged24﹣45andhaveexperienceinteachingandtrainingyoucouldbethepersonwearelookingfor.Youshouldbegoodatthecomputerandhavesomeexperienceinprogrammewriting.Youwillbeallowedtomakeourdecisionandtodesigncoursesaswellaspresentthem.Payupwardsof￡15000fortherightperson.PleaseapplybysendingyourCV简历toMrsR.OgliviePalmlaceLimited. 1Whoshouldyougetintouchwithifyouhopetoworkinaradiostation? A.ProducerVacanciesKiss100. B.MrsR.OgliviePalmlaceLimited. C.TheEnterpriseShoppingCentre D.WealdenDistrictCouncil. 2WelearnfromtheadsthattheEnterpriseShoppingCentreneedsapersonwho. A.isagedbetween24and40 B.maydosometrainingwork C.shoulddealwithgeneralduties D.canworkforaboutamonth 3Whichpositionisopentorecentschoolgraduates? A.ProducerLondonKiss. B.FatherChristmas. C.AccountantsAssistant D.SoftwareTrainer 4WhatkindofpersonwouldprobablyapplytoPalmaceLimited? A.OnewithGCSEgradeClevel. B.Onewithsomeofficeexperience. C.Onehavinggoodcomputerknowledge D.Onetrainedinproducingmusicprogrammes.
某种机器使用若干年后即被淘汰该机器有一易损零件为调查该易损零件的使用情况随机抽取了100台已被淘汰的这种机器经统计每台机器在使用期内更换的该易损零件数均只有891011这四种情况并整理了这100台机器在使用期内更换的该易损零件数绘制成如图所示不完整的条形统计图． 1请补全该条形统计图 2某公司计划购买一台这种机器以及若干个该易损零件用上述100台机器更换的该易损零件数的频率代替一台机器更换的该易损零件数发生的概率． ①求这台机器在使用期内共更换了9个该易损零件的概率 ②若在购买机器的同时购买该易损零件则每个200元若在使用过程中因备用该易损零件不足再购买则每个500元．请你帮该公司用花在该易损零件上的费用的加权平均数进行决策购买机器的同时应购买几个该易损零件可使公司的花费最少
﹣2的绝对值为
YouprobablyknowwhoMarieCuriewasbutyoumaynothaveheardofRachelCarson.Oftheoutstandingladieslistedbelowwhodoyouthinkwasthemostimportantwomanofthepast100years? JaneAddams1860﹣1935 AnyonewhohaseverbeenhelpedbyasocialworkerhasJaneAddamstothank.Addamshelpedthepoorandworkedforpeace.Sheencouragedasenseofcommunity社区bycreatingsheltersandpromotingeducationandservicesforpeopleinneedIn1931AddamsbecamethefirstAmericanwomantowintheNobelPeacePrize. RachelCarson1907﹣1964 Ifitweren'tforRachelCarsontheenvironmentalmovementmightnotexisttoday.Herpopular1962bookSilentSpringraisedawarenessofthedangersofpollutionandtheharmfuleffectsofchemicalsonhumansandontheworld'slakesandoceans. SandraDayO'Connor1930﹣present WhenSandraDayO'ConnorfinishedthirdinherclassatStanfordLawSchoolin1952shecouldnotfindworkatalawfirmbecauseshewasawoman.ShebecameanArizonastatesenator参议员andin1981thefirstwomantojointheU.S.SupremeCourt.O'Connorgavethedecidingvoteinmanyimportantcasesduringher24yearsonthetopcourt. RosaParks1913﹣2005 OnDecember11955inMontgomeryAlabamaRasaParkswouldnotgiveupherseatonabustoapassenger.HersimpleactlandedParksinprison.ButitalsosetofftheMontgomerybusboycott.Itlastedformorethanayearandkickedoffthecivil﹣rightsmovement.TheonlytiredIwaswastiredofgivinginsaidParks. 1WhatisJaneAddamswell﹣﹣knownforinhistory? A.Hereffortstowinaprize. B.Herlackofpropertraininginlaw. C.Hersocialwork. D.Hercommunitybackground. 2WhatisthereasonforO'Connor'sbeingrefusedbythelawfirm? A.Herlackofpropertraininginlaw. B.Herlittleworkexperienceincourt. C.Thediscriminationagainstwomen. D.Thepoorfinancialconditions. 3Whomadeagreatcontributiontothecivil﹣rightsmovementintheUS? A.JaneAddams. B.RosaParks C.SandraDay D.RachelCarson. 4Whatcanweinferaboutthewomenmentionedinthetext? A.Theyarehighlyeducated. B.Theyaretrulycreative. C.Theyarepeace﹣lovers. D.Theyarepioneers.
已知∠AOB＝60°OC是∠AOB的平分线点D为OC上一点过D作直线DE⊥OA垂足为点E且直线DE交OB于点F如图所示．若DE＝2则DF＝．
如图直线y＝4﹣x与双曲线y＝交于AB两点过B作直线BC⊥y轴垂足为C则以OA为直径的圆与直线BC的交点坐标是．
ChoosingtheRightPathtoBeaBetterPerson Lifeisaconstantexerciseinself﹣improvement.Intherushtoachievetheideaofbeingbettercanbecomelostsometimes.Youmayalwayswonderhowtoimproveyourselfandfulfillyourdreamsinaneasierway.1 Exploreyourtalents. Everybodyhassomeoutstandingskillsorinterests.Soit'softennecessarytobepatientandtrymanythingsbeforeyoufindonethatsuitsyou. 2Forexamplepeoplelovingadventuremaynotbeinterestedinthequietchessclubbutsomeonewhoenjoysotherquietactivitiesmightbe.Determiningwhoyouenjoybeingaroundmayhelpyouknowwhatyou'llenjoy. 3 Nomatterhowmuchmoneyyoumakeyouwillnotbehappyifyouspendyourentirelifedoingsomethingyouhate.It'simportanttoatleastdevotesomeofyourtimetowhatmakesyouhappy. Ifyou'reparticularlyunhappyatyourjobconsiderwhy.4Ifyoufeelyourjobisn'tmeaningfulorisn'tinlinewithyourvaluesconsiderfindinganotherjob. Experiencesomethingnew. Researchhasshownthatwhenwe'reinourcomfortzonewearen'tasproductiveaswearewhenwestepjustbeyondit.5Becauseofthatwemayreactslowlytoourownpositiveexperiences.It'simportanttohavenewexperiencesandinteractionswithothersevenwhenthosearealittlescary.Doingsocanhelpyouachievemore. A.Dowhatyoulove. B.Herearesometipsforyou. C.Registerinaclassyou'reinterestedin. D.Humansadaptveryquicklytopositiveevents. E.It'spossiblethatsomechangesmaychangeyourfeeling. F.Similartypesofpeoplemaybeattractedtothesameactivities. G.Trynottoallowyourselftofocussomuchonacertainaspectofyourlife.
Celebrities名人likeOliviaMunnaswellasfashioncompanieslikeCucciandVersaceareamongthosewhohavebeenopposed1wearinganimalfur.NowSanFranciscohasbecomethe2largecityintheUSAtobanretailersfromsellingnewfurtotheircustomers. Thebanaimstosend3strongmessagetothefurindustry4thecrueltytheseanimalsendureforthepurposeof5becomeclothingisnotconsistentwiththevalueofthecity. AsweallknowWestHollywoodbecamethefirstAmericancity6forbidthesaleofnewfuritemsin2011andBerkeleypassedabanonthesaleoffurclothingin2017.Additionallyin2000theUKledthecharge打头阵7followbyAustraliain2004.MorerecentlytheNetherlandstheEuropeanUnion'smaproduceroffurbannedfurfarmingin2012andplanstoendmink貂farmingby2024.In2018Norwaybannedfurfarmsand8endfoxandminkfarmingby2025. Hopefullyonlywheneffortslikethesearemadetoencourage9consumetostopbuyingrealanimalfur10thelivesofanimalsbefurtherprotectedallovertheworld.
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