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锑（Sb）广泛用于生产各种阻燃剂、陶瓷、半导体元件、医药及化工等领域．以辉锑矿为原料制备金属锑，其一种工艺流程如下： 已知部分信息如下： I．辉锑矿（主要成分为Sb2S3，还含有As2S5、P...
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高三下学期化学《》真题及答案
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Sb2O5是一种重要的阻燃剂用X来生产该阻燃剂的化学方程式为X+2H2O2Sb2O5+2H2O根据质
SbO
2
Sb
2
O
3
HSbO
3
H
3
SbO
4
氧化锑Sb2O3用于橡皮配方中作
硫化剂；
促进剂；
阻燃剂；
防老剂。
下列关于半导体的说法正确的是
常温下半导体的电阻为零
半导体广泛应用于各种电子设备
半导体就是超导体
任何情况下半导体都是不导电的
制造霍尔元件的半导体材料中目前用的较多的是锗锑化铟砷化铟其原因是这些
半导体材料的霍尔常数比金属的大
半导体中电子迁移率比空穴高
半导体材料的电子迁移率比较大
N型半导体材料较适宜制造灵敏度较高的霍尔元件
通常用于精密恒湿槽的湿敏元件是
氯化锂湿敏元件
半导体陶瓷湿敏元件
高分子膜湿敏元件
热电阻式湿敏元件
物质X.是一种重要的阻燃剂工业上用三氧化二锑Sb2O3生产X.反应的化学方程式为Sb2O3+2H2O
Sb
2
O
5
SbO
2
HSbO
3
H
3
SbO
4
物质X.是一种重要的阻燃剂工业上用三氧化二锑Sb2O3生产X.反应的化学方程式为Sb2O3+2H2O
Sb
2
O
5
SbO
2
HSbO
3
H
3
SbO
4
物质X是一种重要的阻燃剂用三氧化二锑Sb2O3生产X.的化学方程式为Sb2O3+2H2O2==X+2
SbO
2
Sb
2
O
5
HSbO
3
H
3
SbO
4
物质X.是一种重要的阻燃剂工业上用三氧化二锑Sb2O3生产X.的化学方程式为Sb2O3+2H2O2=
SbO
2
Sb
2
O
5
HSbO
3
H
3
SbO
4
物质X是一种重要的阻燃剂工业上用三氧化二锑[Sb2O.3]生产X.的的化学方程式为Sb2O.3+2H
半导体制冷技术是用于电脑元件散热的前沿科技.其原理是珀尔贴效应.如图所示是半导体制冷的原理图.把N.
物质X是一种重要的阻燃剂工业上用三氧化二锑Sb2O.3生产X的化学方程式为Sb2O.3+2H2O.2
SbO2
Sb2O.5
HSbO3
H3SbO4
Sb2O5是一种重要的阻燃剂用X.来生产该阻燃剂的化学方程式为:X+2H2O2==Sb2O5+2H2
SbO
2
Sb
2
O
3
HSbO
3
H
3
SbO
4
物质X.是一种重要的阻燃剂用三氧化二锑Sb2O3生产X.的化学方程式为Sb2O3+2H2O2X+2H
SbO
2
Sb
2
O
5
HSbO
3
H
3
SbO
4
物质X.是一种重要的阻燃剂用三氧化二锑Sb2O3生产X.的化学方程式为Sb2O3+2H2O2X+2H
SbO
2
Sb
2
O
5
HSbO
3
H
3
SbO
4
由于金属锑的导电性介于导体与绝缘体之间以及它容易形成合金而具有很多重要用途下列对锑元素15Sb的单质
金属锑可用于制半导体材料
金属锑可用于制合金，以提高金属的硬度
金属锑及其化合物往往有毒，使用时要倍加小心
在火柴盒侧面涂有的三硫化二锑，用作氧化剂
制备含等元素的新型洁净复合阻燃剂和复合膨胀阻燃基料有利于提高材料的阻燃性能
碳、磷
磷、氮
铝、氯
锑、氮
物质X.是一种重要的阻燃剂工业上用三氧化二锑Sb2O3生产X.反应的化学方程式为Sb2O3+2H2O
Sb
2
O
5
SbO
2
HsbO
3
H
3
SbO
4
物质X.是一种重要的阻燃剂工业上用三氧化二锑Sb2O3生产X的化学反应为Sb2O3+2H2O2=X+
Sb
2
O
5
SbO
2
HSbO
3
H
3
SbO
4
半导体制冷技术是用于电脑元件散热的前沿科技其原理是珀尔帖效应如图所示是半导体制冷的原理图把N.型半导
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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.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. 增加把缺词处加个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉.修改在错的词下划一横线并在该词下面写出修改后的词. 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. Todaythenumberofthenetizens网民inourcountryhaveincreasedrapidlyyetmanyofthemdonotpayenoughattentiontothefamily.ItisnodoubtthatwebenefitmuchfromtheInternet.Foranexampleit'sconvenientforustogettheinformationsweneedandcommunicatewithourfriendsandrelatives.Meanwhileitcouldhelpuslearnthatishappeningbothathomeandabroad.ThereforenomatterhowattractivetheInternetisweshouldn'tseparatedfromourlovedones.WeshouldstopsurftheInternetandspendtimewithourfamiliesenjoyingthetimewhenyouaretogether.
氨是合成尿素的重要原料也可进行脱硝减少NOx对环境的污染． 回答下列问题 1在一定条件下NH3与NO反应生成无污染气体 已知①4NH3g+5O2g＝4NOg+6H2Og△H＝﹣905kJ•mol﹣1 ②N2g+O2g＝2NOg△H＝+180kJ•mol﹣1 NH3g与NOg在一定条件下反应的热化学方程式为． 2某科研小组利用反应2NH3g+CO2g＝CONH22s+H2Og△H＜0模拟工业合成尿素．向5L的恒容密闭容器中投入4molNH3和1molCO2保持温度不变反应经50分钟达到平衡． ①平衡时测得容器中cCO2＝0.1mol•L﹣1则反应从开始到达到平衡时平均化学反应速率vCO2＝化学平衡常数K＝保留小数点后两位． ②以下表述能说明上述反应已达到平衡状态的是填字母． A．混合气的密度不再变化B．2vNH3＝vH2O C．气体的平均相对分子质量不再变化D．混合气的压强不再变化 ③图是该条件下系统中尿素的物质的量随反应时间的变化趋势．当反应时间达到5min时若迅速将体系升温请在图中画出15～50min内容器中尿素的物质的量的变化趋势曲线． ④若在平衡状态时保持温度不变再向容器中加入2.0molNH3和1.0molH2Og则化学平衡 移动墳“正向“逆向”或“不” 3我国研制出非贵金属镍基高效电催化剂实现电解富尿素废水低能耗制H2装置如图总反应为CONH22+H2O3H2↑+N2↑+CO2↑ ①A电极连接电源的极填“正”或“负”． ②A电极的电极反应式为．
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FourHabitstoHelpYouSucceed Weallwanttosucceed.Forthosewhohavetriedandfailedsuccessseemsdifficulttounderstand.1. •Knowyourvalues. Findingyourvaluesisinlinewithcreatingmotivation.2Pickahandfulofthingsandwritethemdown.Remindyourselfofyourvalueseverydayandreflectonwhetheryouarehonoringthosevaluesthroughyourwork. •Pickagoalandfocusonit. Chooseonegoaltostartsomethinglargeenoughthatwillgiveyouasenseofachievementwhileadjustingwelltoyourvalues.Focusiskeyhere.3Ifyouperformmanytasksatatimeyoumightneverfinishyourprojectsbecausetheywilltakefartoolong. •Setatimeforsuccess. Setadateforsuccess.Knowwhenyouhopetorealizeyourgoal.4Bysettingatimelimityouaremakingtheprocessrealistic. •5. Failurecan'tbeavoidedwhenyoutakerisks.Byitsverydefinitionthedesiretosucceedmeansyouareriskingfailure.Manypeopletendtogiveupfartooearly.Don'tfallintothistrap!Usefailure.Treatitasagoodthingandgoon. A.Themorefocusedyouareononegoalthehigherchanceyouhaveofsuccess. B.Maketherightdecision. C.Ihavemadealistoffourhabitstohelpyousetgoalsandrealizethem. D.Don'tgiveupbecauseoffailure. E.Keepitrealisticwhilenotgivingyoutoomuchtime. F.Sitandreflectonwhatyouvaluemost. G.Pushyourselftobecourageousandtakethatnextstep.
Myfamilyoftenhadaget﹣togetherwithfriendsinmychildhood.AsIwassmarttherewasalwayssomeonewhowouldcomeuptomentionmyhigh1andaskWhatareyougoingtodowhenyou2? Wellitstartedoutbeingateacherorahero.3itwasafiremananartist…AsIgrewoldermydreamsofthefuture4.WhenIwasgoingtocollegeIwasaskedWhatwillyoumajorin?anotherquestion5tofindoutwhatIwouldbewhenIgrewup. BythenImadeupmymindtobecomea6programmer.SoIwasstudyingsoftwareformuchofmylife.Iam7thatIcouldrealizemydream.Therealizationofmylifepurposeencouragesmetohelpotherstosucceedintheirown8. Howeverformanythereisa9whichgoesaroundstealingourdreamsandrobbingusofthe10mentalstatetoachieveour11.Sometimesthethiefwillcomeasaparentarelativeorafriend12thegreatestthiefisjustourselves. Usuallywhenweareaboutto13theaimasmallvoiceinsidewillsayYouwillnever14.Veryfewhaveeverdonethissuccessfully.Andonandonthesmallvoicemakesus15heartandfail. Failure16helpsourdreamstocometrue.Itisoneofthemostimportant17wehavebecauseitteachesus18lessons.Andwhenwelearntheselessonswellweare19forsuccess. Therearenoovernightsuccessesbutwithperseverance毅力theywillcome.Sojustdon't20.Letdreamsstayinyourlife. 1A.intelligence B.power C.quality D.character 2A.getup B.pickup C.growup D.setup 3A.Later B.Before C.Recently D.Meanwhile 4A.kept B.changed C.formed D.continued 5A.imagined B.designed C.supposed D.answered 6A.car B.radio C.computer D.satellite 7A.surprised B.happy C.interested D.worried 8A.studies B.work C.lives D.experience 9A.thief B.parent C.friend D.relative 10A.same B.only C.necessary D.exact 11A.results B.advantages C.power D.goals 12A.so B.because C.and D.but 13A.reach B.select C.leave D.remove 14A.fail B.succeed C.arrive D.forget 15A.break B.lose C.give D.take 16A.though B.instead C.besides D.otherwise 17A.purposes B.tools C.messages D.medicines 18A.logical B.hopeless C.thankful D.valuable 19A.responsible B.sorry C.angry D.ready 20A.takeapart B.giveup C.bringback D.setoff
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.
假如你叫李华你和你的家人去笔友David所在的城市新加坡Singapore旅游受到David的热情款待回来后你想对他表达自己的感谢之情.请根据以下要点给David写一封信. 1.感谢他的热情款待 2.在新加坡玩得很开心 3.新加坡的风景和美食令人印象深刻 4.邀请他来遵义旅游. 注意1.词数100词左右2.可适当增加细节以使行文连贯. DearDavid Yours LiHua
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Paynoattentiontothosewholaughatyou.Whatmostishowyouseeyourself. A.matters B.minds C.cares D.counts
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联合国宣布2019年为“国际化学元素周期表年”．元素WXY和Z在周期表中的相对位置如图所示其中元素Z位于第四周期WX．Y原子的最外层电子数之和为18．下列说法正确的是 W X Y Z
关于有机物的下列说法正确的是
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
JohnMichaelThomas14Florida WhenJohnMichaelThomasdecidedtohonorhisfriendandclassmateElizabethBuckleywhodiedfromcancerherememberedhowmuchshelovedpeacocks孔雀. Hewantedtobuildalifesizedpeacockfountain喷泉inElizabeth'sfavoriteparkinthecity.Hethoughtitcouldbeaplaceforpeopletorelaxandbeinspired. JohnMichaelraised﹩52000tobuildthefountain. BarrettEngland13Utah ThewheelsbegantoturnforBarrettEnglandwhenheheardaboutKarmaBikeShopaplacewhereyoungpeoplecanearnafreebikebyreadingandperformingcommunity社区service. BarrettvisitedKarma'sownerwithhisideaHewouldcollectandrepairusedbikesanddonate捐赠themtotheshop. Heexpectedtogetabout10donatedbikes.IntheendBarrettreceived39. ZacharyBlohm15Wisconsin The25yearoldplaygroundatanelementaryschoolnearMilwaukeeWis.wassosmallthatonly70ofits575studentscouldplayonitatatime. That'swhenZacharyBlohmsavedthedayHeandsomevolunteersbuiltahugeplayground.ToraisemoneyZacplannedTshirtandbakesalessoldticketsandmore.Heheldmonthlymoneyraisingeventsformorethanayear.Overallhecollected﹩130000﹣enoughtofinishhisproject. JackZimmerman16NewJersey Forsomepeoplefindingamealisassimpleasopeningtherefrigerator.Formorethan366000hungrykidsinNewJerseyit'snotthateasy. Thatfactdidn'tsitwellwithJackZimmermanwhoorganizedadrivetolessenchildhoodhungerinhisstate.Hisgoalcreate40000packagedmealsthatcouldbedonatedtothoseinneed.OngamedayJackandhisvolunteersstartedtheirwork.Afterthefinalcounttheteamhadpackaged47124meals﹣wellaboveJack'sgoal. 1Thepeacockfountainwasbuiltinapark. A.toinspirepeople B.fortheloveofanimals C.inmemoryofateenager D.toencourageacancersufferer 2WhatdidBarrettdoforKarmaBikeShop? A.Hedonatedbikestoit. B.Herepairedbikesthere. C.Hehelpeditwincustomers. D.Heofferedareadingservicethere. 3Whatdothefourpeoplehaveincommon? A.They'retopstudents. B.Theycareaboutothers. C.Theylikevariouspublicactivities. D.They'remoneyraisersforthepoor.
室温下某同学进行CO2与Na2O2反应的探究实验回答下列问题． 1用下图装置制备纯净的CO2 ①丙装置的名称是乙丙装置中盛装的试剂分别是． ②若CO2中混有HCl则HCl与Na2O2反应的化学方程式为． 2按照下面的装置图进行实验夹持装置略． ①先组装仪器然后再用注射器1抽取100mL纯净的CO2将其连接在K1处注射器2的活塞推到底后连接在K2处具支U形管中装入足量的Na2O2粉末与玻璃珠． ②打开止水夹K1K2向右推动注射器1的活塞可观察到的现象是． ③实验过程中需缓慢推入CO2其目的是为达到相同目的还可进行的操作是． 3实验结束后当注射器1的活塞推到底时测得注射器2中气体体积为65mL则CO2的转化率是．
Manypeoplethinkheroesneedtobehandsomerichorverysmart.Butasformeaheroisapersonwhoalwayshelpsothers. MyheroisUncleBill.Heistheeldestsonofaworkerandhegrewupinapoorfamilywithfouryoungerbrothersandtwolittlesisters.Hehadtogiveupschoolathisveryyoungage.Heworkedandgaveallhismoneytohisparents.Whenhewasgettingolderhefoundthathewasveryinterestedinfixingthings.Hecollectedbrokenthingswhichpeoplethrewawayandfixedthemintogoodones.Hecouldfixalmosteverythingthatdidnotwork.Heworkedhardandnevergaveup.Finallyheopenedhisownrepairshop.Ittookhimabout20yearstobecomeasuccessfulshopkeeper店主. Nowheisveryrichandhasfourothershops.Butheneverforgetsthedayswhenhehadnothing.Hegivesmoneytopoorfamilieshelpspoorkidsbuybooksandoffersthemfreelunches.Healsoencouragespeopletorecyclethings.HealwayssaysMakegooduseofwhatyouhavebecausewejusthaveoneearth.Hevolunteerstocleantheenvironmentinourneighborhood. 1WhatdoesUncleBill'sfatherdo? A.Heisashopkeeper. B.Heisaworker. C.Heisamathteacher. D.Heisafarmer. 2HowmanybrothersandsistersdoesUncleBillhave? A.7. B.6. C.5. D.4. 3WhydoesthewriterthinkUncleBillisahero? A.Heisrichandsmart. B.Heisasuccessfulshopkeeper. C.Healwaystrieshisbesttohelpothers. D.Heisgoodatfixingbrokenthings. 4WhichofthefollowingisTRUEaccordingtothepassage? A.UncleBillisnotgoodatfixingthings. B.UncleBillownsfiverepairshops. C.UncleBillforgetsthedayswhenhehadnothing. D.UncleBillcaresaboutnotpeoplebuttheenvironment. 5What'sthebesttitleforthispassage? A.UncleBill﹣MyHero B.ASuccessfulShopkeeper C.ProtectOurEarth. D.Let'sHelpEachOther.
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goodadvicetheteachergaveme! A.How B.What C.Whata D.Howa
NA是阿伏加德罗常数的值下列说法正确的是
Imusthavelookeddeepinthoughtorasdeepinthoughtasan11﹣year﹣oldmancanwhenmygrandmotherglancedupfromherweedingtoaskYouhavesomethingonyourminddon'tyou? YesIwasthinkingthatsomedayIwanttobeanOlympicspeedskatingchampionlikemyheroEricHeidenIwanttobeadoctorlikemyparentsandIwanttohelpchildreninAfrica. IimmediatelyknewIhadconfidedintherightpersonwhenaknowingsmilebrokeacrossherface.Johannofcourse!Youcandoanythingyouwanttodo!shesaidsimply.Andwithmygrandmother'ssupportIsetouttopursuemypassions. 14yearslaterIwaswellreadytotakeholdofmyfirstdreambecominganOlympicchampion.TheOlympicsin1994wereinmyhomecountryNorway.AsIenteredtheOlympicstadiumIwasn'tthebestathleteandmanyhaddoubtsaboutmyabilitytoperformwell.ButIhadsomethingspecialworkingforme.IhadawomaninthefirstrowwhobelievedinmefollowingmypassionsjustasmuchasIdid.Forthefirsttimeevermygrandmotherwasgoingtoseemeskate. Ithappened.BreakingaworldrecordIwonthegold. AsIstoodonthepodium领奖台thatIhaddreamedaboutmyentirelifeacuriousquestionpoppedintomyhead.Whyme?WhydidIwingivenalltheotherincrediblecompetitorsoutthere?Thereasonhadtobemorethanagrandmotherwhosharedabeliefinhergrandson'sdream.ThequestionledmetoonlyoneanswerbecauseIwantedtomakeadifferenceintheworldandwithallthemediaattentiononmysuccessIcould. IimmediatelyknewwhatthatdifferencehadtobehopeinthelivesofthechildreninAfrica.SixmonthsearlierI'dbeeninvitedtoEritreaasanambassadorforOlympicAid. 1Whentheauthorspokeoutwhatwasonhismindhisgrandmother. A.laughedathim B.supportedhim C.hadnoconfidenceinhim D.feltquitesurprised 2Theauthorprobablyrealizedhisfirstdreamattheageof. A.20 B.22 C.25 D.28 3Whatwilltheauthortellusinthepartfollowingthepassage? A.HiseffortsinhelpingtheAfricanchildren. B.HishardtraininginpreparingforthenextOlympics. C.HissuccessesatotherOlympicgames. D.Hisgrandmother'sattitudetowardshim. 4Thewholepassageismainlyabout. A.ayoungboywhohadmanydreams B.theencouragementfromagrandmother C.asportsmanwhorealizedhisfirstdreamofhelpingAfricanchildren D.anOlympicherowhomadeadifferenceintheworld
We'resurroundedbychemistryineverydaylife.Sometimesitiseasytoseelikewhenyourscienceteacherconductsabigexperimentinclass.Atothertimesitcanbeextremelyhardtoseeeverydaychemistryatworkbutnearlyeverythingyoutouchorusehassomeelementofchemistryinit. Somethingassimpleastoothpastecontainsatleastthreechemicalsifnotmore.Itisthemixtureofthemanditschemicalreactionthatkeepsyourteethclean.Otherthingsyouuseeverydayarecreatedbychemistrysuchashairproductsshampooandsoap.Addingdetergent洗涤剂towaterinvolveschemistry.Withoutchemistrywewouldneverhaverealizedthatweneedsoaptogettheoiloutofclothesorskin. Chemistrynotonlyhelpsusmakeproductsforusebutitalsohelpsusunderstandtheworldaroundus.Chemistryhelpsusunderstandwhattheozonelayer臭氧层isandhowitprotectsus.Chemistryalsogivesussunscreentoprotectusfromthesun.Thankstochemistryweknowbleach漂白剂can'tbemixedwithvinegarbecauseitcanproducepoisonousgas.Withoutchemistrywewouldn'thavehadfireworksdisplaysonimportantdaysliketheSpringFestival. Chemistryplaysabigroleinfoodpreparation.Cookingfoodcausesittogothroughachemicalchange.Thatiswhycookedfoodoftentastesdifferentfromraw生的food.Bakingisagreatexampleofchemistry.Toomuchortoolittleofanyingredientmakesadifferencetotheresultofbakingforexamplethedough面团won'triseorthecakewillbeflat. Chemistryisn'tsomethingthatjustlivesinalabit'ssomethingthatyoucomeacrosshundredsoftimeseveryday.Ifyouknowhowchemistryworksyouwillgetagreatercomprehensionofthesciencebehindsomeofthesimplestlookingthings. 1What'sthemainideaofParagraph1? A.Chemistryiseasytoseearoundus. B.Sometimeschemistryishardtoseearoundus. C.Ascienceteacheroftendoesabigexperiment. D.Fewthingsineverydaylifecontainchemistry. 2ThefollowingactionsareaboutchemistryEXCEPT. A.cleaningteethwithtoothpaste B.washinghairwithhairproducts C.usingsoaptoremovetheoilfromclothes D.washingyourfacewithwater 3TheunderlinedwordpoisonousinParagraph3means. A.harmful B.healthy C.fresh D.pleasant 4WhichoneisTRUEaccordingtoParagraph4? A.Onecan'tfindchemistrywhencookingfood. B.Chemistryplaysanimportantpartinfoodmaking. C.Thatdoughrisesisnothingtodowithchemistry. D.Aflatcakeistheresultoftoomanyingredients
﹣IlovetheInternet.I'vecometoknowmanyfriendsontheNet. ﹣.Fewofthemwouldbecomeyourrealfriends. A.Ican'tagreemore B.I'mpleasedtoknowthat C.That'sforsure D.That'snotthecase
ThereisanoldEnglishsayingLaughteristhebestmedicine.OnepersoncertainlywouldhaveagreedwiththisisNormanCousins. NormanCousinswastheeditorofamagazinecalledSaturdayReviewforalmostfortyyears.Healso1andspokeaboutworldpeaceandanti﹣warissues反战议题travelingtomanydifferentcountriestosharehis2. Inthe1960safterreturningtotheUnitedStatesfromabusyandtiringtriptoEurope.Mr.Cousinsgot3.Hediscoveredhehadastrangediseasethatcausedgreatpaininhisbones骨头. Inlessthanaweekafterhegotbackhecouldnot4it.Everymovethathemadewaspainful.Hewasnotableto5atnight.ThedoctortoldMr.Cousinsthattheydidnotknowhowtocure治疗hisproblemandhemightnever6theillness.Mr.Cousinshoweverrefusedtogiveuphope. Mr.Cousinsthoughtthattheillnesscouldbecausedby7thoughts.Hedidnotwanttotake8tocurehimself.Insteadhefeltthathappythoughtsorlaughtermightcurehisillness. Hebegantoexperimentonhimselfwhilestillinthehospitalbywatchingcomedyshowsontelevision.Mr.Cousinsquicklyfoundthattenminutesof9laughterduringthedaygavehimtwohoursofpain﹣freesleepatnight. Decidingthatthe10couldnothelphimMr.Cousinsleftthehospitalandcheckedintoahotelroomwherehecould11hisexperimentswithlaughter.ForeightdaysMr.Cousins12inthehotelroomwatchingcomedyshowsontelevisionreadingamusingbooksandsleepingwheneverhefelt13.WithinthreeweekshefeltwellenoughtotakeavacationtoPuertoRicowherehebeganrunningonthebeachfor14. AfterafewmonthsMr.Cousinswas15tocarryonhiswork.Hehadlaughedhimselfbacktohealth. 1A.laughed B.taught C.wrote D.copied 2A.magazines B.subjects C.photos D.ideas 3A.rich B.sick C.lonely D.famous 4A.stand B.realize C.face D.improve 5A.dream B.eat C.shout D.sleep 6A.gothrough B.lookafter C.getover D.findout 7A.unhappy B.pleasant C.silly D.clever 8A.food B.time C.medicine D.money 9A.unusual B.false C.real D.wild 10A.friends B.laughter C.experiment D.doctors 11A.begin B.end C.continue D.report 12A.rested B.worked C.studied D.played 13A.well B.tired C.afraid D.worried 14A.help B.exercise C.freedom D.fun 15A.able B.safe C.lazy D.uncertain
IneversawmyfatherhomefromworklateorillnordidIeverseemyfathertakeanightoutwiththeboys.Hehadnobobbiesbutjusttookcareofhisfamily. For22yearssinceIlefthomeforcollegemyfathercalledmeeverySundayat900am.Hewasalwaysinterestedinmylife﹣howmyfamilywasdoing.ThecallsevencamewhenheandmymotherwereinAustraliaEnglandorFlorida. NineyearsagowhenIboughtmefirsthousemyfather67yearsoldspenteighthoursadayforthreedayspaintingmyhouse.Hewouldnotallowmetopaysomeonetohaveitdone.AllheaskedwasaglassoficedteaandthatIholdapaintbrushforhimandtalktohim.ButIwastoobusyforIhadalawpracticetorunandIcouldnottakethetimetoholdthepaintbrushortalktomyfather. Fiveyearsagomy71﹣year﹣oldfatherspentfivehoursputtingtogetheraswingset秋千formydaughter.AgainallheaskedwasthatIgethimaglassoficedteaandtalktohimButagainIhadlaundrytodoandthehousetoclean. ThemorningonSundayJanuary161995myfathertelephonedmeasusualthistimehehadseemedtohaveforgottensomethingswehaddiscussedtheweekbefore.IhadtogettochurchandIcuttheconversationshort. Thecallcameat440am.ThatdaymyfatherwassenttohospitalinFlorida.IgotonaplaneimmediatelyandIvowed发誓thatwhenIarrivedIwouldmakeupforthelosttimeandhaveanicelongtalkwithhimandreallygettoknowhim. IarrivedinFloridaat100ambutmyfatherhadpassedawayat912pm.Thistimeitwashewhodidnothavetimetotalkortimetowaitforme. IntheyearssincehisdeathIhavelearntmuchaboutmyfatherandevenmoreabouteverysingleday. 1Weknowfromthereadingthatthefather. A.likedtopainthouses B.hadnofriendsaroundhim C.wasnothealthyinhisyouth D.thoughtofhisfamilyashisall 2Whenherfatherpaintedherfirsthousethedaughter. A.couldonlyaffordaglassoficedtea B.wastoobusytotalktoherfather C.coulddonothingbutholdapaintbrush D.spenteighthoursadayworkingwithherfather 3OnJanuary161995thedaughterfeltthatherfather. A.seemedtobealittledifferent B.hadnotimetophoneherasusual C.becameinterestedinchurch D.hadforgottentodiscusssomethingswithher 4Inthereadingtheunderlinedphrase‘gettoknowhim'mostprobablymeans. A.gethimtoknowher B.knowmoreabouthim C.gethimtoknowhimself D.makehimwell﹣known 5Whichisthebesttitleofthereading? A.PaintingHouses B.Daughter'sFamily C.FatherandI D.Father'sphonecalls
BeforeweleftLiYanpingexplainedtomethattheforceofgravitywouldchangethreetimesonourjourneyand1thefirstchangewouldbethemostpowerful.Thenwewereoff.Astherocketroseintotheairwe2pullbackintoourseatsbecauseweweretryingtoescapethepulloftheearth'sgravity.Itwasso3strengththatwecouldnotsayanythingtoeachother.GraduallytheweightlessenedandIwasabletotalkto4he.Whyisthespaceshipnotfallingbacktotheearth?OntheearthifIfallfrom5treeIwillfalltotheground.Iasked.Wearetoofar6theearthnowtofeelitspullhe7explainsowefeelasifnogravityatall.Whenweget8closetothemoonlittlebylittleweshallfeelitsgravitypullingusbutitwillnotbeaspowerfulapullastheearth's.Icheeredupimmediatelyandfloated9weightlessaroundinourspaceshipcabin10watchtheearthbecomesmallerandthemoonlarger.
含氮化合物的用途广泛氮气是制备含氮化合物的重要原料．回答下列问题 已知N2g+3H2g⇌2NH3g△H＜0不同温度下向三个相同的容器中投入等量的反应物进行反应测得平衡混合物中NH3的物质的量分数与压强的关系如图所示 1M点的v正Q点的v正填“＞”“＜”或“＝”原因是 2图中三条曲线对应的温度T1T2T3由高到低的顺序为 3恒温恒容条件下能说明反应N2g+3H2g⇌2NH3g达到平衡状态的是填编号． A.保持不变 B.3molH﹣H键断裂的同时有2molN﹣H键断裂 C.2vN2＝vNH3 D．反应器中的压强不再发生变化 4T3温度下将1molN2和3molH2充入2L密闭容器中维持压强为60MPa不变达到N点的平衡状态该反应的平衡常数K＝M点的平衡常数N点的平衡常数填“＞““＜”或“＝” 5合成氨工业中原料气所含的少量CO对合成塔中的催化剂有害可由“铜洗”工序实现对原料气精制．有关反应的化学方程式如下[CuNH32]Acaq+COg+NH3g⇌[CuNH33]]Ac•COaq△H＝﹣35kJ•mol﹣1用化学平衡移动原理分析该工序生产的适宜条件为． 6氨气是工业制硝酸的主要原料．T℃时NH3和O2可能发生如下反应 ①4NH3g+5O2g⇌4NOg+6H2Og△H＝﹣907kJ•mol﹣1 ②4NH3g+3O2g⇌2N2g+6H2Og△H＝﹣1269kJ•mol﹣1 其中②是副反应．若要减少副反应提高NO的产率最合理的措施是T℃时N2和O2反应生成NO的热化学方程式为．
下列实验中对应的现象以及结论都正确且两者具有因果关系的是 选项 实验操作 现象 结论 A 向酸性KMnO4溶液中滴加H2O2 紫色褪去 KMnO4在酸性条件下具有氧化性 B 常温下将Al片置于浓硫酸中 无明显变化 Al与浓硫酸不反应 C 往未知液中先后滴入足量氯水和几滴KSCN溶液 溶液变血红色 未知液中含有Fe3+ D 将某溶液与盐酸反应产生的气体通入澄清石灰水中 溶液变浑浊 某溶液中一定含有CO32﹣
亚硝酰氯NOCl常作催化剂其沸点为﹣5℃遇水发生剧烈反应生成一种氢化物和两种氧化物．某小组设计实验制备亚硝酰氯并测定其纯度制备原理2NO+Cl2＝2NOCl实验装置如图所示． 回答下列问题 1仪器a的名称为装置B的作用是． 2写出A装置中发生反应的离子方程式． 3实验时组装好仪器检查装置气密性的操作是． 4装药品之后关闭止水夹填图中止水夹代号下同打开止水夹引发A中反应通入一段时间气体其目的是．然后通过控制止水夹开关使两种气体在D中反应当三颈瓶内有少量液体生成时停止实验． 5测定产品纯度取wgD中液态产品溶于蒸馏水配制成250mL溶液用酸式滴定管准确量取25.00mL所配溶液于锥形瓶中滴加几滴K2CrO4溶液作指示剂用棕色酸式滴定管盛装cmol•L﹣1AgNO3标准溶液滴定至终点消耗标准溶液体积为VmL．已知Ag2CrO4为砖红色固体 ①写出亚硝酰氯与水反应的化学方程式． ②该产品纯度为用代数式表示． ③若水洗后的棕色酸式滴定管未用待装溶液润洗便进行实验则测得结果填“偏高”“偏低”或“无影响”．
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