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空气的成分中体积分数约占21%的是（ ）
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空气是一种宝贵的自然资源空气中体积分数约占21%的是*
氮气
氧气
二氧化碳
稀有气体
空气的成分按体积分数计算氮气约占______氧气约占______
空气成分中体积分数约占21%的是▲
氮气
二氧化碳
氧气
稀有气体
空气是宝贵的自然资源空气中体积分数约占21%的是
稀有气体
氮气
二氧化碳
氧气
空气成分中体积分数约占21%的气体是
水蒸气
二氧化碳
氧气
氮气
空气的成分中体积分数约占21％的是
氮气
氧气
二氧化碳
稀有气体
空气成分中体积分数约占21%的是
氧气
氮气
二氧化碳
稀有气体
空气的成分中体积分数约占21%的是
氮气
氧气
二氧化碳
稀有气体
空气中体积分数约占21%的是稀有气体的体积分数．
空气成分中体积分数约占21%的是
氮气
氧气
二氧化碳
稀有气体
空气中体积分数约占21%的气体是
氧气
氮气
二氧化碳
稀有气体
空气是一种宝贵的资源空气中体积分数约占21%的是
二氧化碳
氮气
氧气
稀有气体
空气中体积分数约占21%的气体是
氮气
氧气
二氧化碳
稀有气体
人类每时每刻都离不开空气在空气中体积分数约占21%的气体是
氮气
氧气
二氧化碳
稀有气体
空气中体积分数约占21%的是
氮气
氧气
二氧化碳
稀有气体
空气中体积分数约占21％的气体是
稀有气体
二氧化碳
氮气
氧气
空气的成分中体积分数大约为21%的是
氮气
氧气
二氧化碳
稀有气体
空气是一种宝贵的自然资源空气中体积分数约占21%的是
氧气
氮气
二氧化碳
稀有气体
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15分Nov2wasadaytorememberinChina'saviation航空history.Itwastheday1itsfirsthomemadelargepassengeraircrafttheC919wasunveiledinShanghai.ThismakesChinathe2threeregiontomanufacturelargepassengeraircraft3followtheUS'BoeingcompanyandtheEuropeanUnion'sAirbusline. Alargepassengeraircraftisaplanethatweighsover100tonswhenittakesoff.Thenameisalso4linktothenumberofseatsontheplane.InChinaanairliner5morethan150seatsisconsideredalargeaircraft.Andinthe6nationworlditmeansaplanewithover300seats. AccordingtoXinhuatheC919whichwillmake7firstflightin2016canseat190peopleatmost.Ithasastandardflightrangeof4075kmandanextendedrangeof5555km.Thismeansitcanfly8directfromBeijingtoSingapore. 9abilitytomanufacturelargepassengeraircraftisasymbolofacountry'soverallstrengthsaidPresidentXiJipinglastyear.Thisis10makinglargeaircraftisahigh﹣techintensiveindustrythatinvolvesdifferentdisciplinesrangingfromaerodynamicstomaterialscience.
工业上生产烧碱的反应原理为2NaCl+2═2NaOH+Cl2↑+H2↑．某研究小组对某包装破损烧碱样品进行了探究 【提出问题】烧碱样品中可能含有哪些杂质 【猜想】猜想一可能含有碳酸钠猜想的依据是用化学方程式表示． 猜想二可能含有氯化钠．猜想的依据是在化工生产中原料可能未完全转化为产品． 【实验探究】请帮甲同学完成以下探究实验 【交流与反思】同学们讨论后认为以上实验过程中引入了写离子符号因此无法得出“样品中有氯化钠”的结论为了能准确验证猜想二需要把步骤①中的稀盐酸换为写化学式．
如图是关于氧气化学性质的部分知识网络关于该图说法错误的是
15分LearningEnglishusedtobeaboutdevelopingfourskillsreadingwritinglisteningandspeaking.Afterallthat's1theexamsaredesigned﹣withfourskillstestedseparately. Butovertheyearseducatorshavecome2realizethatthesefourskillsshouldneverhavebeenseparatedbutpracticedallatonce.Andthebestwaytodothatisperhapsthroughpublicspeaking. AccordingtoMeiDemingaprofessorofEnglishatShanghaiInternationalStudiesUniversitygivingaspeechinaninternationallanguage3requireaspeakertointegrate使成为一体knowledgeandcontent4mentalandexpresstheresultsystematically.Speakersmustdrawonthebeautyofthelanguageasawholeinordertocommunicatewithanaudience. ThisiswhytheannualChinaDaily21stCenturyCupNationalEnglishSpeakingCompetitionhasbeengaininginpopularitysinceitbeganin1996.Thiscompetitionhasworked5amodelfordevelopingstudents'public﹣speakingskillsinEnglishandprovidedideasforEnglishteachinginschoolsandinlearninginabroadersensesaidMei. ShiGuohua6EnglishteacheratShanghaiQibaoHighSchoolheldasimilarview.HesaidthatkeycompetenceinacquiringEnglishtodaycomesfromtheabilitytoexpressoneselfratherthaninsimplypassingexams. Healso7stressthatcommunicationshouldgobothwayssincetraditionalEnglishspeakingeducationhasfocusedtoomuchongettingmessagesoutwhile8ignorethereceiverofthesemessages﹣theaudience.It'simportanttounderstandtheaudienceandbuildthelinkbetweenthecontentbeingdeliveredandtheinterestsoftheaudiencehesaid.It'salsoimportanttocreateanimpressiveopeningtoaspeech. AsChinacontinuestoplayanimportantroleinglobalconversationstherewillbemore9chanceforyoungChinesepeopletopresentChinaandtellattractingstories.AndinordertotellChinesestories10wellwefirstneedtodevelopamoreoverallEnglishskill.Workingonpublicspeakingisperhapstheplacetostart.
6分FourteenagegirlsfromMinnesotaUS.120hoursofnon﹣stoptogetherness.Nocellphones.Thisisnotarealityshowbutanadventurejourney. ItwasreallyperfectsaidJuliaRuelleofherrecentadventuretotheBoundaryWatersCanoeAreaWildernesswiththreeofherchildhoodfriends.Byunpluggingwehadanamazingtime. Lastyearthe16﹣year﹣oldtookpartinanessaycontestandcarriedoffaprize.Theawardwasa5﹣daycanoeandcampingadventurewithuptothreefriends.Noparentsorguideswouldbethere.SoJuliainvitedherfriendsAnnaWanderMadelineWilsonandJuliannaTorelli. ThefourMinnetonkaHighSchooljuniorsarrivedinElyfortrainingthedaybeforetheybeganthejourney.Theysetoutthenextdayat7a.m.quicklydevelopingaroutine. WeweredonepaddlingbynoonJuliasaid.Weatelunchatthecampsitesandthenitwastimeforhammocks吊床readingmakingfriendshipbracelets手镯andtalking. Thegirlshadallhadexperienceintheoutdoorsbefore. AnnahadbeentotheBoundaryWaterswithherfamily.IlovehowyouareseparatedfromeverythinginyourlifeespeciallytechnologyAnnasaid.WithoutherphoneshesaidI'mlessworriedaboutthings.MadelinetoohadbeentotheBoundaryWatersafewyearsback.ButthistimeIhadtopaddlerightandsetupcampshesaid.Thegirlsmadefireandcookedmealtogether.Noonewaseverhungryorhomesickbuttheywerenervousthefinalnightastheywaitedoutathunderstorm.Theyleftwetsleepingbagsinonetentandsqueezedintoanotherforthenight.EverythunderstormintheBoundaryWatersfeelshugeJuliasaid. Onthecarridehometheywereallontheirphonescatchingupwithfriends.ItwasalittleatalossturningmyphoneonsaidAnna.MentalhealthcanbeimprovedsomuchintheBoundaryWaters.Itreallyhelpstogetawayandreconnectwithyourself. 1HowdidJuliaRuellegetthechancetocamp? A.Shewonanessaycontest. B.Shewasinvitedbyherfriends. C.Sheperformedwellinherschool. D.Sheaskedherparentsforsupport. 2Whywasthe5﹣dayadventureuniquetothegirls? A.Theyneededtocompletemanytasks. B.Theyneededtofindaguideontheirown. C.Theyhadtoliveonaboatforseveraldays. D.Theyhadtolivewithouttheirsmartphones. 3Whatcanweknowaboutthegirlsfromthestory? A.Theyhadnotgotanycampingexperiencebefore. B.Theyallfeltrefreshedaftertheadventurejourney. C.Theyenrichedtheirlearningexperiencesbyexploring. D.Theyusedtokeepinclosetouchwiththeirfriendsbyphone.
随着人们生活水平的不断提高汽车已走进千家万户制造汽车要用到含铜铁铝等成分的多种金属材料 1车体多用钢材制造其表面喷漆不仅美观而且可有效防止与接触而生锈． 2工业上用CO还原磁铁矿冶炼金属铁的化学方程式为． 3在实验室中验证铁铝铜的金属活动性顺序可将足量的三种金属片依次放入盛有少量稀硫酸的试管中使其充分反应则加入金属的顺序是填化学式
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如图所示实验操作正确的是
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西安具有悠久的历史文明．考古工作者在发掘一座距今已有三千多年的古墓遗址时发现的下列古代文化遗迹与化学变化有密切关系的是
为了鉴别碳酸钠溶液和氢氧化钠溶液同学们进行了探究实验分别取两种溶液于两支试管中各滴入一定量的氯化钡溶液观察到一支试管中出现白色沉淀实验结束后同学们将试管中的清液倒入同一个干净的烧杯中发现有白色沉淀生成同学们对烧杯中的物质进行了过滤并对滤液中的溶质进行了探究 【提出问题】一定含有可能含有A．氯化钡B．碳酸钠 【实验设计】为了验证溶液中可能含有的成分同学们设计如下实验 【反思交流】 1写出碳酸钠与氯化钡反应的化学方程式． 2某同学提出用无色酚酞溶液也可以区分碳酸钠溶液与氢氧化钠溶液请你写出他不正确的理由是．
下列实验操作正确且发生化学变化的是
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化学离不开生活生活中处处蕴含着化学知识和原理 1凉皮肉夹馍和冰峰汽水被冠以“三秦美食”套餐如图1下列关于“三秦美食”套餐的说法正确的是． A凉皮中的黄瓜提供的主要营养素为维生素 B“三秦美食”没有方便面营养丰富 C牛肉夹馍提供的主要营养素为糖类和蛋白质 2开启冰峰时会有大量的气泡产生此现象说明气体溶解度与压强的关系是． 3图2生活用品主要石油有机合成材料制成的是．
对下面符号数字示意图的理解正确的是
“结构决定性质性质决定用途”是学习化学的重要思想方法．下列说法中正确的是 ①钠原子和钠离子质子数相同所以它们的化学性质相同 ②金刚石和石墨中碳原子排列方式不同所以它们的物理性质差异很大 ③水和过氧化氢的分子构成不同所以它们的化学性质不同 ④氮气常温下化学性质稳定所以可用于制氮肥 ⑤洗涤剂具有乳化功能所以可去除油污 ⑥烧碱能与酸发生中和反应所以可用于改良酸性土壤．
有ABC三种物质已知A是一种氯化物B是一种酸含有三种元素C是一种碱．图甲表示ABC三种物质的溶液两两混合时的实验现象请回答 1生成D的化学式为 2ABC之间能发生个复分解反应 3将一定质量镁锌两种金属同时放入A溶液中充分反应过滤滤液为无色则滤液中一定含有的阳离子为写离子符号 4若金属MN分别为铁和锌中的一种分别与等质量等溶质质量分数的B溶液反应产生氢气的质量与反应时间的关系如图乙所示反应结束后只有一种金属有剩余则剩余金属为用MN表示．
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推理是化学学习中常用的思维方法以下四个推断中正确的是
请根据如图ABC三种物质的溶解度曲线回答下列问题 1温度越高溶解度越小的物质是 2t1℃时物质A和C的溶解度均为25g其饱和溶液中溶质的质量分数为． 3t℃时把等质量的A和C配成饱和溶液A的饱和溶液质量大于C温度t的范围是． 4下列说法正确的是填序号 ①将t1℃的ABC三种溶液分别升温其浓度都不可能发生变化 ②将t1℃的ABC三种溶液分别降温其浓度都可能发生变化 ③将t2℃的ABC三种饱和溶液的温度分别降至t1℃时A溶液中析出的晶体最多 ④在温度为t2℃时ABC三种溶液的溶质质量分数可能相等．
8分AfunnythinghappenedbetweenChina'sfirstfemaleNobelPrizewinnergivingheracceptancespeechinSwedenandthatspeechreachingherhomecountryTwoentirelydifferentversionsappearedandthefakeonebecameaviralhit. Guesswhichversionisreal?Theonethatmatter﹣of﹣factlytellsaboutthediscoveryofartemisinin青蒿素ortheonewithextremeliterarystylecompletewithherfatherexplainingtheoriginofhergivennameandpoeticlinessuchasIliketranquility宁静tranquilastheleavesofsweetwormwood蒿草;Ishunthespotlightjustasthepetalsofsweetwormwooddo;Iaspire追求tobeuprightasarethestemsofsweetwormwood. WellsweetwormwoodistheplantfromwhichTuandherfellowscientistssuccessfullyextractedartemisinin.Manyreadersweresotouchedbytheliteraryversionthattheywereleftintears. TheyjustforgotthatTuisnotawomanoflettersbutoneofscience.Itwascompletelymadeupbysomeonewhoobviouslyhasgreatliterarytalentbutcouldnotunderstandtheinnerlifeofascientist.IhavenotmetagreatmanyscientistsChineseorforeignbuttheonesIhavespokentohavebeenno﹣nonsenseandwouldnotusesuchliterarylanguage. Idon'tknowwhomadeuptheTuspeechorforwhatpurpose.Itdoesnotstrikemeasfunny.Fortunatelynomainstreammediaseemedtohavebeenfooled.YetthefakeonehasprobablybeensharedmorethantherealonebecauseitplayedtotheChinesestereotype固定形式ofwhatsuchaspeechshouldbe. China'scyberspace信息空间isfullofeducationalandupliftingquotesandquitealotofthemaremadeup.ThereisajokethatsaystheUnitedStates'spyingnetworkcollectedandexaminedalltheInternetdatainChinaandfoundthattheChineseareaddictedtosuchchickensoupincludingthatfromuntrustworthysources. 1Whymanyreadersweremovedtotearsbythefakespeech? A.Becauseitwaswritteninliterarystyle. B.BecauseitwasonthebasisofTu'sreallife. C.Becausethereadershadpassionforscience. D.BecausethereadersknewabouttheoriginofTu'sgivenname 2Whomightbetheauthorofthefakespeech? A.ReporterfromtheUnitedStates'spyingnetwork B.Awriterwithgreatknowledgeofthesciences. C.OneofTu'sfans. D.Someonewithgreattalentinwriting. 3Whythefakespeechhasbeensharedmorethanrealone? A.Becausemanymainstreammediaswerefooled. B.BecauseitwastheChinesestereotype. C.Becauseitwasfunny. D.Becausethewriterunderstoodtheinnerlifeofascientist. 4Thepurposeofthearticleisto. A.provethatChineseareaddictedtofakenews. B.findoutwhomadeupthefakespeech. C.totellustherearelotsoffakenewsintheinternet D.provethatChinesescientistshavenoliterarytalent
8分HaveyoueverheardsomeonesayYoutotallylooklikeyou'reaJessicaorsomethingsimilar?PeopleseemtothinkthattheyknowwhatkindofpersonaJessicaoraMichaellookslike.Whyisthis? AccordingtoastudypublishedintheJournalofPersonalityandSocialPsychologyhumanstendtoassociatepeople'snameswiththeirappearancesandcanevenguesssomeone'snamebasedonhowtheylook. ResearchersattheHebrewUniversityofJerusalemIsraelcollectedthousandsofphotosofpeople'sfaces.Theylabeled贴标签于eachphotowithfournames.Thentheyaskedvolunteerstoguesswhichofthefournameswascorrect. Thevolunteerswereabletoguesstherightname38%ofthetime.Itseemsthatcertaincharacteristicsoffacesgivethemcluesaboutsomeone'snameReader'sDigestreported. Howeverthisonlyworkedwhenthevolunteerslookedatnamesfromtheirownculture.Inadditionthevolunteerswerenotasgoodatguessingtherealnamesofpeoplewhousednicknames昵称moreoftenthantheirrealnames.Thismayshowthataperson'sappearanceisaffectedbytheirnameonlyiftheyuseitoften. Thiskindofface﹣namematchinghappensbecauseofaprocessofself﹣fulfillingprophecy预言aswebecomewhatotherpeopleexpectustobecomeRuthMayofromtileuniversitytoldsciencenewswebsiteEurekAlert. Earlierstudieshaveshownthatgender性别andracestereotypes刻板印象canaffectaperson'sappearance.Theresearchersbelievetherearealsosimilarstereotypesaboutnames.ForexamplepeopletendtothinkthatmennamedBobshouldhaverounderfacesbecausetheworditselflooksround.PeoplemaythinkthatwomennamedRosearebeautiful.Theyexpectthemtobedelicateandfemalejustliketheflowertheyarenamedfor. 1Howisthisarticledeveloped? A.Bygivingexamples. B.Byaskingquestions. C.Bydoinganexperiment. D.Bycomparingdifferentcases. 2Whatcanbeinferredfromthestudy? A.Volunteersfounditmucheasiertoguessnicknames. B.Nameshavedifferentassociationsindifferentcultures. C.Volunteerscouldguessthecharacteristicsoftheinterviewees. D.Thepeopleinthephotosandvolunteerswerefromthesameculture. 3WhydosomepeoplelookliketheirnamesaccordingtoRuthMayo? A.Theywanttopleaseeveryonearoundthem. B.Theydon'twanttobedifferentfromothers. C.Theytendtobecomewhatothersexpectthemtobecome. D.Theyliketocopyfamouspeoplewhosharethesamename. 4Whatmaybethebesttitleforthispassage? A.Whatdeterminesournames B.Whywelooklikeournames C.Howwegetridofourstereotypes D.Howstereotypesaffectpeople'slooks
下列各组变化中每个转化在一定条件下均能一步实现的是
8分Inspringchickensstartlayingeggsagainbringingawelcomesourceofproteinatwinter'send.Soit'snosurprisethatculturesaroundtheworldcelebratespringbyhonoringtheegg. SometraditionsaresimpleliketheredeggsthatgetbakedintoGreekEasterbreads.Othersupgradetheeggintoafancyartliketheheavilyjewel﹣coveredeggsthatwerefavoredbytheRussiansstartinginthe19thcentury. OneancientformofeggartiseggpaintingwhichcomestousfromUkraine.ForcenturiesUkrainianshavebeendrawingcomplicatedpatternsoneggs.ContemporaryartistshavefollowedthistraditionandadaptedthetraditionalmethodstocreateeggsthatspeaktotheanxietiesofourageLifeispreciousanddelicate.Eggsaretoo. There'ssomethingabouttheirdelicatenaturethatcrazilyappealstomesaysNewYorkercartoonistRozChast.SeveralyearsagoshebecameinterestedineggpaintingandlearnedthetraditionalUkrainiantechniquetodrawherverymoderncharacters.I'vebrokeneggsateverystageoftheprocess﹣fromtheverybeginningtotheveryveryend. Butthere'sanappealinthatvulnerability.There'spartofthissickeninghorrorthatIkindoflikethehorrorofknowingyou'rewalkingontheedgewiththisknowingthatitcouldallfallapartatanysecond.Chast'sdesignssuchasaworriedmanaloneinatinyboatreflectthatdelicateness. TraditionalUkrainiandecoratedeggsalsospoketothosefears.Thecomplexanddetailedpatternswerebelievedtoofferprotectionagainstevil. Eggpaintingartdatingbackto300B.C.waslaterabsorbedintotheChristianchurch.Theoldsymbolshoweverstillsurvive.Adecoratedeggwithabirdonitgiventoayoungmarriedcoupleisawishforchildren.Adecoratedeggthrownintothefieldwouldbeawishforagoodharvest. 1WhatdowelearnaboutthedecoratedeggsinRussia? A.Theyareshapedlikejewelcases. B.Theyareheavilypaintedinred. C.Theyarefavoredasaformofart. D.Theyarevaluedbytherich. 2Whyhavecontemporaryartistscontinuedthetraditionofeggpainting? A.Becauseeggsserveasasymbolofthecomingofspring. B.Becauseeggsprovideasourceofproteininwinter'send. C.Becauseeggsprovideauniquesurfacetopainton. D.Becauseeggsreflecttheanxietiesofpeopletoday. 3Whichofthefollowingbestexplainsvulnerabilityunderlinedinparagraph5? A.Delicateness. B.Technique. C.Fear. D.Anxiety. 4Whatisthemainideaofthetext? A.Eggpaintingartpreservestraditionalandpopularsymbols. B.Differentcultureshavedifferentwaysofhonoringtheegg. C.Ukrainianeggpaintingartappealstocontemporaryartists. D.Eggpaintingartcontinuesanddevelopsinpacewithtime.
10分I'vealwaysbeeninterestedinwhywedothethingswedosolastyearIdecidedI'dliketostudypsychology.MostcoursesIfoundhoweverwereeithertooexpensivetoolongorwereimpossibletocombinewithwork.Iwasabouttogiveup1. AtfirstIhadnoideawhattheyweretalkingaboutbuttheyexplainedthataMOOCisaMassiveOpenOnlineCourse﹣anewtypeofcourseofferedcompletelyonlinetothousandsofpeoplewhichisdesignedsothatanyonecanfollowitregardlessofagelocationoreducation﹣2.Youcansearchforhundredsofdifferentsubjectsandcanusuallywatchashortintroductionvideotogetanideaofwhatthecourseisabout. 3.AtfirstIdidn'tknowwhattoexpectorhowmuchtimeImightspendstudying.Eachweektherewerevideolecturestowatchandreadingstodoaswellassomeshortassignments.Thelectureswerereallyinterestingandeasytofollowanditwasgreattobeabletowatchthemagainorpausethemtogoanddosomethingelse.MostMOOCshaveonlineforums论坛toowherestudentscandiscusswhattheyarelearning.Theseareoftenreallyfascinatingbecausetherearesomanydifferentopinions4.Ifyoureadeverythingontheforumsyouwon'thavetimetofinishthelectures! 5.Thereisahugerangeofcoursesonofferinhundredsofsubjectsandyouhavethechancetolearnnewthingsandbeincontactwithmanydifferenttypesofpeopleallfromthecomfortofyourownhome.WhynotcheckoutaMOOCandstartlearningsomethingnewtoday? A.buttheyareverytime﹣consuming B.allyouneedisanInternetconnection C.whenafriendsuggestedthatItryaMOOC D.Ichoseasix﹣weekSocialPsychologycourse E.itisdifficulttofindacoursetocombinewithwork F.ButtheadvantagesofMOOCsforbusypeopletodayareobvious G.Infactthatseemstobeoneoftheproblemsofthisnewwayofstudying
下列实验方法的设计中不能达到实验目的是
为验证“酸的化学通性”某班同学在实验室进行了如下实验请分析并回答相关问题 1写出能证明A中反应发生的现象． 2B中所发生的反应方程式为． 3要全面验证酸的化学通性C试管中所放固体的物质类别为． 4D实验完成后测得反应后的溶液pH＝2则该溶液中的溶质为．
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