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某校化学兴趣小组的同学利用鸡蛋壳制取二氧化碳并对二氧化碳的性质进行验证,实验装置如图所示(鸡蛋壳的主要成分是碳酸钙):打开K,反应一段时间后:(1)B处可以观察到的现象是 .(2)C处澄清石灰水...
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某化学兴趣小组的同学用如图甲所示的装置制备二氧化碳.1如图甲所示的装置的优点是.2写出实验室制备二氧
实验室里制取二氧化碳气体有下列仪器可供选用请你回答下列问题1制取二氧化碳气体所需的药品是______
下列关于二氧化碳的说法正确的是
二氧化碳是引发酸雨的“罪魁祸首”
二氧化碳固体可用于人工降雨,是利用干冰升华吸热
二氧化碳浓度大可使人窒息,是因为二氧化碳有毒
二氧化碳通入紫色石蕊试液变红,是因为二氧化碳呈酸性
下列操作或用途中既跟二氧化碳的物理性质有关又跟二氧化碳的化学性质有关的是
用二氧化碳制干冰
将二氧化碳加压溶解制汽水
二氧化碳可使石灰浆变硬
二氧化碳可用来灭火
日本已经开始生产以二氧化碳为冷媒制冷物质的汽车空调它与氟利昂相比有很多优点下列说法正确的是
在制冷过程中,二氧化碳发生了化学变化
可以回收利用工厂排放的二氧化碳,减少二氧化碳的排放
使用二氧化碳冷媒会导致臭氧层空洞
可根据二氧化碳的气味判断二氧化碳是否泄漏
二氧化碳的下列用途中既利用它的化学性质又利用了它的物理性质的是
干冰用于人工降雨
干冰用于制造舞台烟雾
用二氧化碳制取碳酸氢铵
用二氧化碳灭火
下列有关二氧化碳的说法正确的是
实验室常用块状石灰石和稀硫酸反应制取二氧化碳气体
二氧化碳用于人工灭火,既利用了它的物理性质也利用了它的化学性质
将二氧化碳气体通入紫色石蕊溶液中,溶液呈红色,说明二氧化碳显酸性
二氧化碳能用于制作碳酸饮料,将燃着的木条伸入一瓶气体中,木条立即熄灭,证明瓶内原有气体就是二氧化碳
实验室制取二氧化碳的反应原理是用化学方程式表示收集二氧化碳的方法是因为验满二氧化碳的方法是.
某化学兴趣小组的同学利用下列装置进行实验室制取气体的探究.1小强用过氧化氢溶液和二氧化锰制取和收集氧
鸡蛋壳的主要成分是碳酸钙某同学进行如下实验将鸡蛋壳洗净干燥并捣碎后称取10g放在烧杯里然后往烧杯中加
某化学兴趣小组的探究实验表明二氧化碳与一氧化碳的性质有很大的不同对这一结论的原因解释比较合理的是
一氧化碳有毒,二氧化碳无毒
一氧化碳有还原性,二氧化碳无还原性
一氧化碳不溶于水,二氧化碳能溶于水
1个CO分子比一个CO
2
分子少一个氧原子
某校九年级3班的几个同学利用鸡蛋壳制取二氧化碳并对二氧化碳的性质进行验证实验装置如图所示鸡蛋壳的主
下列有关二氧化碳的说法正确的是
实验室常用块状石灰石与稀硫酸反应制取二氧化碳气体
二氧化碳用于人工灭火,既利用了它的物理性质也利用了它的化学性质
将二氧化碳气体通入紫色石蕊溶液中,溶液呈红色,说明二氧化碳显酸性
将燃着的木条伸入一瓶气体中,木条立即熄灭,证明瓶内原有气体就是二氧化碳
下列有关二氧化碳的说法正确的是
实验室常用块状石灰石和稀硫酸反应制取二氧化碳气体
二氧化碳用于灭火,既利用了它的物理性质也利用了它的化学性质
将二氧化碳气体通入紫色石蕊溶液中,溶液呈红色,说明二氧化碳显酸性
将燃着的木条伸入一瓶气体中,木条立即熄灭,证明瓶内原有气体是二氧化碳
实验室制取二氧化碳气体有如下图所示的仪器可供选用请你回答下列问题1制取二氧化碳气体所需的药品是2收集
实验室制取二氧化碳气体有如下图所示的仪器可供选用请你回答下列问题1制取二氧化碳气体所需的药品是2收集
某化学兴趣小组的同学用如图甲所示的装置制备二氧化碳.1如图甲所示的装置的优点是.2写出实验室制备二氧
现有烧杯镊子药匙玻璃片锥形瓶生石灰蒸馏水稀盐酸洗净的碎鸡蛋壳等实验用品试设计一个简单实验证明碎鸡蛋壳
某校九年级3班的几个同学利用鸡蛋壳制取二氧化碳并对二氧化碳的性质进行验证实验装置如图所示鸡蛋壳的主要
二氧化碳灭火器是利用其内部充装的液态二氧化碳的蒸气压将二氧化碳喷出灭火的一 种灭火器具二氧化碳灭火器
二氧化碳灭火器的灭火原理是化学抑制灭火
使用二氧化碳灭火器灭火,氧气含量低于15%时燃烧终止
二氧化碳灭火器适宜于扑救600V以下的带电电器火灾
二氧化碳灭火器对硝酸盐等氧化剂火灾的扑灭效果好
二氧化碳灭火器无法用于钾、钙、钠等轻金属火灾的扑救
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DearSirorMadam I'mLiHuathemiddleschoolstudentfromChina.IreadtheannouncementofthesummercampthatyouhavepostedontheInternetandthatIaminterestedinit.IknowthatyouwelcomingstudentsfromdifferentcountriesbutI'dliketotakepartinit.I'vebeenlearningEnglishfor10yearsandIspeakfluentlyEnglish.WhatismoreI'llbeabletotellstudentsfromanothercountriesaboutChinaandlearnabouttheircountriesaswell.IhopeIwillbeacceptedamemberofyoursummercamp. Hereareyouremailaddressandphonenumbers:lihua@123.com;12345678. Lookingforwardtohearfromyousoon. Yours LiHua
HannahTaylorisaschoolgirlfromManitobaCanada.OnedaywhenshewasfiveyearsoldshewaswalkingwithhermotherindowntownWinnipeg.Theysawaman1outofagarbagecan.Sheaskedhermotherwhyhedidthatandhermothersaidthatthemanwashomelessandhungry.Hannahwasvery2.Shecouldn'tunderstandwhysomepeoplehadtolivetheirliveswithoutshelterorenoughfood.Hannahstartedtothinkabouthowshecould3butofcoursethereisnotalotonefive﹣year﹣oldcandotosolve解决theproblemofhomelessness. LaterwhenHannahattendedschoolshesawanotherhomelessperson.Itwasawoman4anoldshoppingtrolley购物车whichwaspiledwith5.Itseemedthateverythingthewomanownedwasinthem.ThismadeHannahverysadandevenmore6todosomething.Shehadbeentalkingtohermotheraboutthelivesofhomelesspeople7theyfirstsawthehomelessman.Hermothertoldherthatifshedidsomethingtochangetheproblemthatmadehersadshewouldn't8asbad. HannahbegantospeakoutaboutthehomelessnessinManitobaandtheninotherprovinces.Shehopedto9hermessageofhopeandawareness.ShestartedtheLadybugFoudationanorganizationaimingatgettingridofhomelessness.Shebeganto10BigBossesluncheswhereshewouldtrytopersuadelocalbusinessleadersto11tothecause.Shealsoorganizedafundraising募捐driveinLadybugJarstocollecteveryone′ssparechangeduringMakeChangemonth.Morerecentlythefoundationbegananother12calledNationalRedScarfDay﹣adaywhenpeopledonate$20andwearredscarvesinsupportofCanada′s13andhomeless. ThereisanemergencyshelterinWinnipegcalledHannah′sPlacesomethingthatHannahisvery14of.Hannah′sPlaceisdividedintoseveralareasprovidingshelterforpeoplewhenitissocoldthat15outdoorscanmeandeath.InthemorethanfiveyearssinceHannahbeganheractivitiesshehasreceivedalotof16.Forexampleshereceivedthe2007BRICKAwardrecognizingthe17ofyoungpeopletochangetheworld.But18allthisHannahstillhasthe19lifeofaWinnipegschoolgirlexceptthatshepaysregularvisitstohomelesspeople. Hannahisoneofmanyexamplesofyoungpeoplewhoaremakinga20intheworld.Youcantoo! 1A.jumping B.eating C.crying D.waving 2A.annoyed B.nervous C.ashamed D.upset 3A.behave B.manage C.help D.work 4A.pushing B.carrying C.buying D.holding 5A.goods B.bottles C.foods D.bags 6A.excited B.determined C.energetic D.grateful 7A.since B.unless C.although D.as 8A.sound B.get C.feel D.look 9A.exchange B.leave C.keep D.spread 10A.sell B.deliver C.host D.pack 11A.contribute B.lead C.apply D.agree 12A.campaign B.trip C.procedure D.trial 13A.elderly B.hungry C.lonely D.sick 14A.aware B.afraid C.proud D.sure 15A.going B.sleeping C.traveling D.playing 16A.praises B.invitations C.replies D.appointments 17A.needs B.interests C.dreams D.efforts 18A.for B.through C.besides D.along 19A.healthy B.public C.normal D.tough 20A.choice B.profit C.judgement D.difference
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Hollywood'stheorythatmachineswithevil邪恶mindswilldrivearmiesofkillerrobotsisjustsilly.TherealproblemrelatestothepossibilitythatartificialintelligenceAImaybecomeextremelygoodatachievingsomethingotherthanwhatwereallywant.In1960awell﹣knownmathematicianNorbertWienerwhofoundedthefieldofcybernetics控制论putitthisway:Ifweusetoachieveourpurposesamechanicalagencywithwhoseoperationwecannoteffectivelyinterfere干预wehadbetterbequitesurethatthepurposeputintothemachineisthepurposewhichwereallydesire. Amachinewithaspecificpurposehasanotherqualityonethatweusuallyassociatewithlivingthings:awishtopreserveitsownexistence.Forthemachinethisqualityisnotin﹣bornnorisitsomethingintroducedbyhumans;itisalogicalconsequenceofthesimplefactthatthemachinecannotachieveitsoriginalpurposeifitisdead.Soifwesendoutarobotwiththesingleinstructionoffetchingcoffeeitwillhaveastrongdesiretosecuresuccessbydisablingitsownoffswitchorevenkillinganyonewhomightinterferewithitstask.Ifwearenotcarefulthenwecouldfaceakindofglobalchessmatchagainstverydeterminedsuperintelligentmachineswhoseobjectivesconflictwithourownwiththerealworldasthechessboard. Thepossibilityofenteringintoandlosingsuchamatchshouldconcentratethemindsofcomputerscientists.Someresearchersarguethatwecansealthemachinesinsideakindoffirewallusingthemtoanswerdifficultquestionsbutneverallowingthemtoaffecttherealworld.Unfortunatelythatplanseemsunlikelytowork:wehaveyettoinventafirewallthatissecureagainstordinaryhumansletalonesuperintelligentmachines. SolvingthesafetyproblemwellenoughtomoveforwardinAIseemstobepossiblebutnoteasy.Thereareprobablydecadesinwhichtoplanforthearrivalofsuperintelligentmachines.ButtheproblemshouldnotbedismissedoutofhandasithasbeenbysomeAIresearchers.Somearguethathumansandmachinescancoexistaslongastheyworkinteams﹣yetthatisnotpossibleunlessmachinessharethegoalsofhumans.Otherssaywecanjustswitchthemoffasifsuperintelligentmachinesaretoostupidtothinkofthatpossibility.StillothersthinkthatsuperintelligentAIwillneverhappen.OnSeptember111933famousphysicistErnestRutherfordstatedwithconfidenceAnyonewhoexpectsasourceofpowerinthetransformationoftheseatomsistalkingmoonshine.HoweveronSeptember121933physicistLeoSzilardinventedtheneutron﹣induced中子诱导nuclearchainreaction. 1Paragraph1mainlytellsusthatartificialintelligencemay. A.runoutofhumancontrol B.satisfyhuman'srealdesires C.commandarmiesofkillerrobots D.workfasterthanamathematician 2Machineswithspecificpurposesareassociatedwithlivingthingspartlybecausetheymightbeableto. A.preventthemselvesfrombeingdestroyed Bachievetheiroriginalgoalsindependently C.doanythingsuccessfullywithgivenorders D.beathumansininternationalchessmatches 3Accordingtosomeresearcherswecanusefirewallsto. A.helpsuperintelligentmachinesworkbetter B.besecureagainstevilhumanbeings C.keepmachinesfrombeingharmed D.avoidrobots'affectingtheworld 4Whatdoestheauthorthinkofthesafetyproblemofsuperintelligentmachines? A.ItwilldisappearwiththedevelopmentofAI. B.Itwillgetworsewithhumaninterference. C.Itwillbesolvedbutwithdifficulty. D.Itwillstayforadecade.
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So对太空着迷thathedevotedallhisenergytoobservingstars.crazy
SailingThroughHistory Agroupof1309passengersboardedtheMSBalmoralonSundayinSouthamptonEnglandonavoyagetoretracethepathoftheTitanic.TheTitanicwasthebiggestshipintheworldwhenitsailedonitsill﹣fatedmaidenvoyagein1912.Ofthe2227passengersandcrewaboardmorethan1500died.TheshipwhichwasheadedtoNewYorkCitycarriedtherichandfamousonitsfirstvoyage.ItalsocarriedimmigrantswhowereseekingabetterlifeinAmerica. RelativesofpeoplewhosailedontheTitanichistoriansauthorsandpeoplefascinatedbythestoryoftheunsinkableshipareontheBalmoral.Theywanttorememberthedoomedshipandthosewhodiedonherfirstandlastvoyage.ThehistoriclinerhadsetsailonApril101912fromSouthampton.LateatnightonApril14shehitaniceberg.IntheearlymorninghoursofApril15theTitanicsank. TheBalmoralisfollowingTitanic'soriginalroutefromSouthampton.Firstthemodern﹣daycruiselinerdockedintheportofCherbourgFrancewheretheTitanichadpickedupmorepassengers.OnMondayafternoontheBalmoralstopsinCobhIrelandtheTitanic'slastportofcallbeforesailingtoNewYork. BalmoralwillthencruisetheNorthAtlanticOceantothelocationwhereTitanichitanicebergthatrippedtheship'shull外壳.OnSundayApril15at2:20a.m.﹣thetimetheTitanicwentdown﹣passengersandcrewwillholdamemorialservice.ThenexttwodayswillbespentinHalifaxCanadawheremanyvictimsofthesinkingareburied.ThentheBalmoralwillreachitsfinaldestinationinNewYorkCitywhereTitanicwassupposedtodock﹣butneverdid. Untiltodayseveralteamsofdivershaveexploredthesite.Theyhaverecoveredsomeitemssuchasdishesandsilverwareandputthemonpublicdisplay.Andmoretripsareplannedtothewreckageinthefuture.TheTitanicanditspassengersandcrewhavebeenrememberedinbooksmoviesandTVprograms.Butthere'samuchmoreimportantcontributionthatTitanicgaveus.Aftershesanklawmakersandshipbuildersmadeshipssafer.Ittookaterribletragedytomakeshiptravelsaferforall. 1HowmanypassengersinTitanicsurvivedatlast? A.Morethan1500. B.About1309. C.About1000. D.Lessthan750. 2HowmanycountriesdoestheBalmoralreachbeforesailingtoNewYork? A.Two. B.Three. C.Four. D.five. 3TheBalmoralwillstayinCanadajust. A.inmemoryofthedeadpassengersintheBalmoral B.inmemoryofthesurvivorsinTitanic C.inmemoryofthedeadpassengersinTitanic D.inmemoryofthesurvivorsintheBalmoral 4WhatmightbethemostimportantcontributionofsunkenTitanic? A.Itssiteattractsmoreexploringteams. B.Itmakesthelatershipsmoresecure. C.Someofitsitemsareonpublicdisplay. D.Moretripsareplannedtoitswreckage.
Manypeopleholdtheopinionthatisnouseworkhardbecausetheyarenotbornintoprivilegedfamilies.
Inspiringyoungminds! TOKNOWMagazineisabighitintheworldofchildren'spublishingbringingauniquecombinationofchallengingideasandgoodfuntoyoungfanseverymonth. Soundstoogoodtobetrue? Takealookonline﹣evidenceshowsthatthousandsofteachersandparentsknowagoodthingwhentheyseeitandrecommendTOKNOWtotheirfriends. HappyBirthdayAllYear! Whatcouldbemorefunthanagiftthatkeepscomingthroughtheletterboxeverymonth?Thefirstmagazinewithyourgiftmessagewillarriveintimeforthespecialday. SUBSCRIBENOW □AnnualSubscription Europe£55RestofWorld£65 □AnnualSubscriptionwithGiftPack IncludesaMammothMapaPassportPuzzleBookletandSubscription Europe£60RestofWorld£70 RefundPolicy﹣thesubscriptioncanbecancelledwithin28daysandyoucangetyourmoneyback. 1WhyisTOKNOWaspecialmagazine? A.Itentertainsyoungparents. B.Itprovidesseriousadvertisements. C.Itpublishespopularsciencefictions. D.Itcombinesfunwithcomplexconcepts. 2WhatdoesTOKNOWofferitsreaders? A.Onlinecourses. B.Articlesonnewtopics. C.Lecturesonabalancedlife. D.Reportsonscientificdiscoveries. 3Howmuchshouldyoupayifyoumakea12﹣mouthsubscriptiontoTOKNOWwithgiftpackfromChina? A.£55. B.£60. C.£65. D.£70. 4SubscribersofTOKNOWwouldget. A.freebirthdaypresents B.fullrefundwithin28days C.membershipoftheTOKNOWclub D.chancestomeettheexpertsinperson
Wereyouthefirstorthelastchildinyourfamily?Orwereyouamiddleoranonlychild?Somepeoplethink1matterswhereyouwereborninyourfamily.Buttherearedifferentideasaboutwhatbirthordermeans.Somepeoplesaythatoldestchildren2aresmartandstrong﹣willed意志坚强的areverylikely3succeed.Thereason4thisissimple.Parentshavealotoftimefortheirfirstchildandgivehimorheralotofattention.Anonlychildwillsucceedfor5samereason. Whathappenstothe6childreninthefamily?Middlechildrendon'tgetsomuchattentionsotheydon'tfeelthatimportant.Ifafamilyhasmanychildrenthemiddleonesometimesgetslostinthecrowd.Theyoungestchild7oftengetsspecialtreatment.Oftenthischildgrowsuptobefunny.Butarecentstudysawthingsquite8difference.Thestudyfoundthatfirstchildrenbelievedinfamilyrules.Theydidn'ttakemanychancesin9lives.Theyusually10followorders.Rulesdidn'tmeanasmuchtolaterchildreninthefamily.Theytookchancesandtheyoftendidbetterinlife.
Iafornotbeingabletojoinyoufordinner.
Thedoctorsaiditwasonlyaslightwound.Whatar.
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