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某化学学习小组的同学围绕“澄清石灰水与碳酸钠溶液的反应”展开了如下探究活动. (1)该反应的化学方程式为 . (2)反应后溶液中的溶质是什么?同学们一致认为有以下三种情况: ①氢氧化钠和氢...
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右图表示的是
B.C.三种溶液两两混合发生反应的实验现象,符合该实验现象的A.
C.三种溶液依次是 A.盐酸、碳酸钠溶液、氢氧化钠溶液 B.氯化钠溶液、澄清石灰水、氢氧化钠溶液
盐酸、碳酸钠溶液、澄清石灰水
氢氧化钙溶液、盐酸、硫酸钠溶液
某化学学习小组的同学围绕澄清石灰水与碳酸钠溶液的反应展开了如下探究活动1该反应的化学方程式为____
右图表示的是
B.C.三种溶液两两混合发生反应的实验现象,符合该实验现象的A.
C.三种溶液依次是 A.氢氧化钠溶液、碳酸钠溶液、盐酸 B.氯化钠溶液、澄清石灰水、氢氧化钠溶液
盐酸、碳酸钠溶液、澄清石灰水
盐酸、硫酸钠溶液、氢氧化钙溶液
下列物质中能与澄清的石灰水反应但反应若不加指示剂则无明显现象的是
氯化铁溶液
碳酸钠溶液
稀盐酸
硝酸钠溶液
写出下列反应的化学方程式1碳在氧气中充分燃烧2镁和稀硫酸反应3碳酸钠溶液与澄清石灰水混合
对室温下某试管中的饱和澄清石灰水进行下列操作试管底部均会有白色固体其中没有发生化学变化的是
某同学用吸管向该试管中吹气
加入少量生石灰粉末
加入饱和碳酸钠溶液
将试管放入沸水中
下列物质中能与澄清的石灰水发生反应但反应过程若不加指示剂则观察不到明显现象的是
硝酸钠溶液
稀盐酸
氯化铁溶液
碳酸钠溶液
在学习碳酸钠的性质时做过向盛有少量碳酸钠溶液的试管里滴入澄清的石灰水的实验发现没有看见白色沉淀的现象
某小组同学将140g石灰乳水和氢氧化钙的混合物加入到一定量2%的碳酸钠溶液中恰好完全反应所得溶液中溶
鉴别碳酸钠碳酸氢钠两种溶液的最合适的方法是
两种溶液各取少许,分别滴入酚酞试液,显红色的是碳酸钠溶液
两种溶液各取少许,分别滴加澄清的石灰水,有沉淀生成的是碳酸钠溶液
两种溶液各取少许,分别加热,能产生使澄清的石灰水变浑浊气体的是碳酸氢钠溶液
任取一种溶液少许,滴加氯化钡溶液,若有浑浊产生的是碳酸钠溶液,否则是碳酸氢钠溶液
写出下列反应的化学方程式1碳在氧气中充分燃烧___2镁和稀硫酸反应___3碳酸钠溶液与澄清石灰水混合
某化学学习小组的同学围绕澄清石灰水与碳酸钠溶液的反应展开了如下探究活动.1该反应的化学方程式为.2反
实验室有一瓶存放时间过长的氢氧化钠其中一部分已转化成为了碳酸钠现需用该药品配制氢氧化钠溶液取50克该
右图表示的是
B.C.三种溶液两两混合发生反应的实验现象,符合 该实验现象的A.
C.三种溶液依次是( )
A.盐酸、碳酸钠溶液、氢氧化钠溶液 B.氯化钠溶液、澄清石灰水、氢氧化钠溶液
盐酸、碳酸钠溶液、澄清石灰水
氢氧化钙溶液、盐酸、硫酸钠溶液
下列物质中能与澄清石灰水反应但反应若不加指示剂则无明显现象的是
硝酸钠溶液
氯化铁溶液
稀盐酸
碳酸钠溶液
某小组同学将530g碳酸钠溶液加入到280g石灰乳水和氢氧化钙的混合物中使之恰好完全反应所得溶液中溶
下列反应的化学方程式或离子方程式与反应物之间的相对量的多少无关的是
碳酸钠溶液与盐酸
氢氧化钡溶液与稀硫酸
碳酸氢钠溶液与澄清的石灰水
硝酸银溶液与氨水.
右图表示的是
B.C.三种溶液两两混合发生反应的实验现象,符合该实验现象的A.
C.三种溶液依次是( )
A.盐酸、碳酸钠溶液、氢氧化钠溶液 B.氯化钠溶液、澄清石灰水、氢氧化钠溶液
盐酸、碳酸钠溶液、澄清石灰水
氢氧化钙溶液、盐酸、硫酸钠溶液
下列反应完毕后不能得到溶液的是
二氧化碳通入足量澄清石灰水
碳酸钙与足量的盐酸反应
锌粒与足量的稀硫酸反应
碳酸钠与适量的盐酸反应
右图表示的是
B.C.三种溶液两两混合发生反应的实验现象,符合该实验现象的A.
C.三种溶液依次是
A.盐酸、碳酸钠溶液、氢氧化钠溶液 B.氯化钠溶液、澄清石灰水、氢氧化钠溶液
盐酸、碳酸钠溶液、澄清石灰水
氢氧化钙溶液、盐酸、硫酸钠溶液
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分别写有数字﹣10π的五张大小和质地均相同的卡片从中任意抽取一张抽到无理数的概率是.
函数y=中自变量x的取值范围是
分式方程的解为x=.
黔张常铁路将于2020年正式通车运营这条铁路估算总投资36200000000元数据36200000000用科学记数法表示为.
如图双曲线y=经过点P21且与直线y=kx﹣4k<0有两个不同的交点. 1求m的值. 2求k的取值范围.
假定你是李华你的朋友Peter想了解你校于五月举办的中国传统文化艺术节.请你给Peter写封回信内容包括 1.举办艺术节的目的 2.介绍你最喜欢的一个艺术节活动 3.邀请Peter参加并告之艺术节活动的时间. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
因式分解ax﹣ay=.
我国古代的数学名著九章算术中有下列问题“今有女子善织日自倍五日织五尺.问日织几何”其意思为今有一女子很会织布每日加倍增长5日共织布5尺.问每日各织多少布根据此问题中的已知条件可求得该女子第一天织布尺.
计算﹣10﹣2sin30°+﹣1+﹣12019
下列四个图形中不是轴对称图形的是
WHO'SWHOINTHEZOO? IsitamazingthattheWHO'SWHOINTHEZOOmakesitfunforyoungchildrentosave?WiththehelpofStandardBank'sKidzAPPandtheBigFiveanimalfriendsteachingyourchildrenaboutmanagingtheircashhasneverbeenmorefun.LettheWHO'SWHOINTHEZOOshowyourlittleoneswhatitmeanstoearnandsavemoneyaswellasshareintheenjoymentofspendingtheirwell﹣earnedcash. Elephant Asyourchildrenusethemobileapptocompletevariousactions﹣achievingsavingsgoalscompletingmissionsandachievingwishes﹣herevariousmedalswillberewarded. Earnedmedalsaredisplayedintheelephanthabitataswellaslockedmedalsstilltobeachieved. Leopard Rewardyourkidswithpocketmoneyforcompleting‘missions'householdchoresachievementsetc. Youcancreateamissionforyourchildoryourchildcanrequestanewmission.Oncecreateditmustbeaccepted.Themissionneedstobecompletedbyyourchildandapprovedbyyoubeforeyoucanpayhimorher. Lion Helpyourchildrencreateandfulfilwishes.Wishcardsandtheirsavingsprogresscanbetrackedfromyourbankingapp. Oncetheirsavingsgoalisreachedlionwillinformyouoftheirachievement. Buffalo Kidzcanrequesttowithdrawcashorpurchaseairtimeanddatausingtheirsavings. Rhino Rhinoshowsyourchild'slatestaccountbalanceandtransactions. DownloadtheStandardBank'sKidzAPPfromAppleAppStoreonthephone.UsethecommentsectiontointeractwithotherStandardBankcustomersandbankconsultants. 1WhatistheWHO'SWHOINTHEZOOdesignedfor? A.Playersofboardgames. B.Kidsforself﹣servicebanking. C.Parentsforonlinebanking. D.Travelersinthezoo. 2Rewardswillbepaidif. A.thekidsfulfilyourcreatedmissions B.yourkidsgetenoughlockedmedals C.youkeeptheaccountbalanced D.youapprovetherequestviaKidzAPP 3Whichofthefollowinganimalsisrelatedtospending? A.Rhino. B.Leopard. C.Lion. D.Buffalo.
Theboysatonhischairwithhishandabovethekeyboard.Hethoughtaboutwhattowrite. Herecalledthatthecompetitiondeadlinewasmerelyaweekaway.Buthestillhadnotevenstartedonhispiece.Helookedatthebrochureagain.uWRITINGCOMPETITION!thetitleread.Hismomhadencouragedhimtoenterthewritingcompetitionandnowhewastakingitonashispersonaltaskfortheholidays. Astheboyreflectedonhispreviouswritingeffortsherealizedhowhopelesshistaskofwinningwas.Everystoryheeverwrotewasbasedonotherstories.Hehadlittleimaginationandunfortunatelyimaginationwasthekeytowriting. Suddenlyhehadabrainwave.Thistimehecameupwithanoriginalandimaginativestory. Thewordsshottowardshimlikeastormofleaves.Wordswerecomingeasilyflowingthroughhimfasterthanhecouldtype.Hetypedfasterthanheeverhadbefore.Hecontinuedtotypeamazedathoweasywritingthisstorywas.Theboycouldnotstopwriting.Helookedatthewordcountandsawthenumberu248^staringrightbackathim.Hewasnotevenhalfwayyet. Thenheheardthecallofhismothersayingtimeforbed.Hecontinuedwritingthepieceignoringher.Hehadtomakeupforthetimehehadlostthinkingaboutatopictowrite. Finallyhefinished.Thewordcountnowread498. Perfecthethoughtjustunderthewordlimit.Heknewthiswasthestorythatwouldwin. HewentontoGoogleandsearchedforthecompetition.HefoundthepagebuttherewasnoEnterbutton. 1Whatcausedtheboytotakepartinthewritingcompetition? A.Anewcomputer. B.Theprizemoney. C.Hisowninterest. D.Hismom'sadvice. 2Howdidtheboyfinishhisearlierwriting? A.Hismomhelpedhim. B.Hecopiedothers'ideas. C.Hisfriendsassistedhim. D.Heusedhisimagination. 3Whydidtheboydelayhiswriting? A.Becausehewasterriblylazy. B.Becausehedidn'tknowwhattowrite. C.Becausehewasn'tconfident. D.Becausehereadtoomanystories. 4Whichmightbethemaximumwordlimitforeachentry? A.100. B.250. C.500. D.1000.
Thehemlock铁杉treesalongtheWappingerCreekNewYorklookhealthy.HoweverscientistGaryLovettsaysthewhiteballswhichprovideprotectionforthebugsarecreatedbyatinyinsect.It'shardtobelievethetinybugcouldkillatree.Howevertreescanendupwithmillionsandmillionsofthepests.Whentherearethatmanyitendsupkillingthetree. ThebugfromEastAsiaisslowlykillingtreesacrosstheUSA.Thetrouble﹣makingbugisjustoneofmanyinvasive入侵的peststhathaveslippedintotheUnitedStates.Theycanhurtotherlivingthingsintheirnewhome. Manyinvasivepestsarriveonwoodenpalletspiledinsideshippingcontainers.Theysupportandseparategoodsandkeepthemfromslidingaround.Invasivepestsoftentunnelintothepallets.Howcanwestoppestsfromridingonpallets?Lovettsaysnewrulesareneeded.Thecompaniesthatmakepalletsdon'twantmorerules.Congresshasaddedanamendment修正案inthe2018FarmBilltotryandpreventthisproblem.HoweverLovettisnothopefulitwillmakemuchofadifference.Palletsarecheckedbyinspectors.Manyaresprayedwithbug﹣killingpesticide.IbelieveinthesystemsaidBrentMcClendonpresidentofTheNationalWoodenPalletandContainerAssociation.Healsosaidshippingcontainersarecheckedverycarefully. Stilleachyear13millioncontainersareshippedtotheU.S.Eachisfullofwoodenpallets.LovettsaysInspectorscan'tpossiblycheckeverything.Allittakesareafewbadpalletsweshouldgetridofwoodenpallets.Hebelievespalletsshouldbemadeofplasticoreco﹣compositewood.Eco﹣compositewoodisamixofwoodfiberandplastic.Insectscannothideintoit.Oneproblemisthatthesechoicescostmore.Theymaybeworththeextramoneythough.InvasivepestscosttheU.S.﹩5billionayear.Treesdon'tjustdieinforests.Theyalsodieincitiesandouryards.Thentheyneedtobereplaced.Thatcostsmoneytoo. 1AllthestatementsareTRUEexceptthat. A.pesticidehasbeenappliedtobug﹣killing B.invasivepestsarenativetoWappingerCreek C.invasivepestshideinpalletsusedinshipping D.thecompaniesmakingpalletsdon'twantmorerules 2Whatcanweinferfromthepassage? A.Bugscanbeeasilyspottedbyeyes. B.Bugsruintheshippinggoodsslowly. C.Bugswon'tbotherthetreeifjustinfewnumbers. D.Bugscovertreeswithwhitesoftballsforprotection. 3WhydoesGaryLovettwanttogetridofwoodenpallets? A.Becauseinsectsmostlydieinthem. B.Becauseplasticpalletsareeco﹣friendly. C.Becausetheyarenotworthextramoney. D.Becausetheyarethemajorpestcarriers. 4Whatdoesthepassagemainlytalkabout? A.InvasivepestsareharmingplantsintheUSA. B.Effectivemeasureshavestoppedthepestinvasion. C.Congresscontributesalottodealingwithinvasivepests. D.EcosystemintheUSAispoorlydamagedbyinvasivewoods.
如图△ABC内接于⊙OAC=BCCD是⊙O的直径与AB相交于点C过点D作EF∥AB分别交CACB的延长线于点EF连接BD. 1求证EF是⊙O的切线 2求证BD2=AC•BF.
LettersasawayofcommunicationhavelonggivenwaytophonecallsandWeChatmessages.ButaTVshowLettersAliveishelpingbringthisoldwaytokeepintouchback1thepresent. LettersAlivetook2itideafromaUKprogramLettersLivereleasedin2013.Both3showfeaturefamousactorsandactressesbutthere4benoeye﹣catchingvisualeffectsoranyregularshowbiz娱乐圈activities.Insteadit'sjustaliveevent5remarkablelettersselectedfromawidetimespanandadiverserangeofsubjectsareread.ThereisforexampleapassionateletterfromHuangYongyutoplaywrightCaoYu30yearsagotocriticizehislackof6create. Everyletterislikeasmallpieceofhistory.Byhearingthem7readit'sasifwearebeingsentbackintimetoexperienceamomentthatwewouldotherwiseneverhavehadthechanceto. Comparedto8publishtextslettersalso9naturalcomewithapersonaltouch.AswellascelebratingthepainjoywisdomandhumorLettersAlive10committopromotingChineseliteraturesincefirstrun.
下面是一个简单的数值运算程序当输入x的值为16时输出的数值为.用科学计算器计算或笔算.
下列命题是假命题的是
如图一次函数y=kx+b的图象与反比例函数y=的图象在第一象限交于点A32与y轴的负半轴交于点B且OB=4. 1求函数y=和y=kx+b的解析式 2结合图象直接写出不等式组0<<kx+b的解集.
计算+2sin30°﹣3.14﹣π0
﹣2019的绝对值是
为了庆祝中华人民共和国成立70周年某市决定开展“我和祖国共成长”主题演讲比赛某中学将参加本校选拔赛的40名选手的成绩满分为100分得分为正整数且无满分最低为75分分成五组并绘制了下列不完整的统计图表. 1表中m=n= 2请在图中补全频数直方图 3甲同学的比赛成绩是40位参赛选手成绩的中位数据此推测他的成绩落在分数段内 4选拔赛中成绩在94.5分以上的选手男生和女生各占一半学校从中随机确定2名选手参加全市决赛请用列举法或树状图法求恰好是一名男生和一名女生的概率.
操作体验如图在矩形ABCD中点EF分别在边ADBC上将矩形ABCD沿直线EF折叠使点D恰好与点B重合点C落在点C′处.点P为直线EF上一动点不与EF重合过点P分别作直线BEBF的垂线垂足分别为点M和N以PMPN为邻边构造平行四边形PMQN. 1如图1求证BE=BF 2特例感知如图2若DE=5CF=2当点P在线段EF上运动时求平行四边形PMQN的周长 3类比探究若DE=aCF=b. ①如图3当点P在线段EF的延长线上运动时试用含ab的式子表示QM与QN之间的数量关系并证明 ②如图4当点P在线段FE的延长线上运动时请直接用含ab的式子表示QM与QN之间的数量关系.不要求写证明过程
下列运算中正确的是
如图在正方形ABCD中点EF分别在边CDAD上且AF=CE. 1求证△ABF≌△CBE 2若AB=4AF=1求四边形BEDF的面积.
下列立体图形中主视图是圆的是
下列立体图形中俯视图不是圆的是
下列命题是真命题的是
Whileelephantsbornwithouttusks长牙arenotunheardoftheynormallyformjust2to6percentofthepopulation.HoweverthatisnotthecaseatMozambique'sGorongosaNationalParkwhereanastonishing33percentoffemaleelephantsbornafterthecountry^civilwarendedin1992aretuskless.WhilethatmayappeartobejustacoincidenceJoycePooleanelephantbehaviorexperthasanothertheory.Theresearcherthinkswemaybewitnessingunnaturalevolutionofthespeciesduetotheconstanthuntingofelephantsforvaluableivory. Poolesaysbeforethecountry's15﹣year﹣longcivilwarthe100000﹣acreparkwashometoover4000elephants.Howeverbythetimetheconflictendedin1992about90percentofthemhadbeenkilledforivorytohelpfinanceweapons武器andmeattofeedthesoldiers.Ofthelessthan200survivorsover50percentofadultfemaleshadnotusks.Thereforeitisnotsurprisingthatthepark'stusklesselephantpopulationhasgrowngreatly. Thisisnotthefirsttimeresearchershaveobservedagreatchangeinthepopulationofelephants.AtZambia'sSouthLuangwaNationalParkandLupandeGameManagementAreaareaswhichwereheavilyhuntedinthe1970sand1980s35%ofelephants25yearsorolderand13%ofthoseyoungerthan25arenowwithouttusks.A2008studypublishedintheAfricanJournalofEcologyfoundthatthenumteroftusklessfemalesattheRuahaNationalParkinTanzaniawentfrom10.5percentin1969toalmost40percentin1989largelyduetoillegalhuntingforivory. TherecentbanonivoryinboththeUSandChinashouldhelpgetridoforatleastreduceelephanthunting.Howeverscientistsarenotsurehowlongitwilltakeforelephantswithahigherrateoftusklessfemalestochangethetrend. 1WhatistheprobablecauseofthephenomenonmentionedinParagraph1? A.Illegalhunting. B.Constantfarming. Apurecoincidence. D.Naturalevolution. 2WhydidpeoplekillsomanyelephantsduringthecivilwarinMozambique? A.Togetfundsbysellingivory. B.Todevelopnewweapons. C.Toprovidefoodforlocalpeople. D.Tomakeivoryproducts. 3Whichofthefollowinghadtheearliestrecordontusklesselephants? A.GorongonsaNationalPark. B.SouthLuangwaNationalPark. C.TheRuahaNationalPark. D.LupandeGameManagementArea. 4Whatdoestheunderlinedphrasethetrendinthelastparagraphreferto? A.Elephantsfacinggreaterdanger. B.Elephantsgrowingmoreslowly. C.Fewerfemaleelephantsstayingalive. D.Morefemaleelephantsbeingtuskless.
一元二次方程x2﹣2x+3=0根的情况是
Wearesurroundedbymessagestryingtogetourattention.Advertiserspoliticiansandothergroupsalltrytogetustoagreewiththem.1.Propagandaisnotalwaysabadthingbutitoftenhidesthetruthaboutatopic.It'sverysimilartoadvertisingwhosegoalistogetpeopletobuysomethingwhilepropagandaistochangewhatpeoplebelieve. PropagandaTechniques Tocreatepropagandaacommontechniqueisname﹣calling.Apoliticianmightcallsomeoneatraitororliarwhichmakestheotherpersonlookbad.Anotheristhetrendtechnique.Peoplewanttobeonthesideinthefavor.2.Somepropagandaisbasedonfear.Itscarespeopleintochoosingacertainsideortakingactionwhichmightnotbebad.Anti﹣smokingcampaignsareoneexample.Theymayscarepeopleintothinkingthatiftheysmoketheywillgetcancer. 3Propagandaisusedbymanygroupssuchasbusinessespoliticiansandthegovernment.Itisspreadthroughposterstelevisionandradio.TheInternetmakesiteasytosendmessagestothewholeworld. TypesofPropaganda Politicalpropagandahasbeenaroundaslongastherehavebeenpoliticians.4.Peoplehaveuseditformanyyears.WarpropagandabeganduringWorldWarImorethan100yearsago. Toseeifpropagandaissayingthetruthpeopleneedtodoextrawork.Forexampleadsmightalwayssoundlikethey'retrue.Butbeforeyoubelievethemtrytothinkaboutwhocreatedandpaidforthem.Findoutwhytheydidit.5. A.PropagandaTargets B.PropagandaMediums C.Anotherwordforthisispropaganda D.Somostpeoplewillagreewiththosepoliticians E.Thenyoucandecideifthey'rebeinghonestornot F.Howeverreligiouspropagandawasactuallythefirstofficialone G.Peoplemightjoinsomeonewhoclaimstobepopularorwinning
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