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某碳酸钠样品中含有少量氯化钠．现取一定量该样品，加水配制成80g溶液，再加入80g氯化钙溶液，恰好完全反应，过滤后得到溶质质量分数为10%的滤液150g．求：（1）生成沉淀的质量为 g；（2）原...
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纯碱中常含有少量的氯化钠为了测定某纯碱样品中碳酸钠的含量称取该纯碱样品8.3g充分溶于71.7g水中
用侯氏制碱法制得的纯碱中含有一定量的氯化钠现称取只含氯化钠的纯碱样品34.6g放入盛有130g稀盐酸
欲测定某氯化钠样品含少量碳酸钠中氯化钠的质量分数．取50g固体样品加入到一定量的氯化钙溶液中恰好完全
21.2%
78.8%
33.3%
25%
我国化工专家侯德榜的侯氏制碱法为世界制碱工业做出了突出的贡献工业上用候氏制碱法制得的纯碱中含有一定量
用侯氏制碱法制得的纯碱中含有一定量的氯化钠．现称取只含氯化钠的纯碱样品34.6g放入盛有130g稀
某纯碱样品中含有少量氯化钠为测定样品中碳酸钠的质量分数现称取该样品11g加入到盛有50g稀盐酸的烧杯
某家里蒸馒头用的纯碱中含有少量的氯化钠某实验小组要测定该纯碱中碳酸钠Na2CO3的含量现取该纯碱样品
用侯氏制碱法制得的纯碱中含有一定量的氯化钠.现称取只含氯化钠的纯碱样品34.6g放入盛有130g稀盐
某化工厂生产的碳酸钠产品中含有少量的氯化钠其他杂质忽略不计取一定量固体样品放入烧杯中加入137.7
某化工厂的纯碱样品中含有少量的氯化钠.化学兴趣小组的同学为测定该纯碱样品中碳酸钠的含量取该纯碱样品1
某家里蒸馒头用的纯碱中含有少量的氯化钠某实验小组要测定该纯碱中碳酸钠的含量现取该纯碱样品8g加入13
某纯碱样品中含有少量氯化钠.为测定样品中碳酸钠的质量分数现称取该样品11g加入到盛有50g稀盐酸的烧
工业制取碳酸钠常会含有少量的氯化钠.实验探究小组欲测定碳酸钠样品中碳酸钠的质量分数取该样品11g加入
用侯氏制碱法制得的纯碱中常含有少量的氯化钠为测定某纯碱样品中碳酸钠的质量分数小明称取该样品11g加入
纯碱样品中含有少量的氯化钠某同学为测定该纯碱样品中碳酸钠的含量取该纯碱样品11g全部溶解在100g水
工业制取碳酸钠常会含有少量的氯化钠.实验探究小组欲测定碳酸钠样品中碳酸钠的质量分数取该样品11g加入
某碳酸钠样品中含有少量氯化钠杂质．现将11g此样品放人烧杯中加入一定量水中完全溶解制成溶液再向其中加
记算题工业上用侯氏制碱法制得纯碱样品中含有一定量的氯化钠现称取含氯化钠杂质的纯碱样品23.3克放入
某碳酸钠样品中含有少量氯化钠为测定样品中碳酸钠的质量分数现称量该样品11g放入烧杯中再加入50g稀盐
某不纯的氯化钙样品中含有氯化铁氯化镁氯化钠碳酸钠中的某些物质取样品11.1克溶于适量水得无色澄清的溶
既无氯化铁、也无碳酸钠 ，可能含有氯化镁
只有氯化镁、没有氯化钠
只有氯化钠、没有氯化镁
一定有氯化镁和氯化钠
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如图是木炭还原氧化铜反应的实验装置图下列说法正确的是
1分WasittheconferenceofAPECthatmadeShanghaithefocusoftheworld A.holding B.tohold C.havingbeenheld D.held
1分Chinesepeoplearehopefulfor2015willbringfortheirfamiliesandthecountry. A.how B.which C.what D.that
1分ItoldLilyhowtogetherebutperhapsIitoutforher. A.musthavewritten B.shouldwrite C.hadtowrite D.oughttohavewritten
12分Inthefutureairtravelcouldbe48expensivethankstoanewaircraftdesignwhichplanstoseatpassengersfacingeachotherinrows.Thedesignisintended49savespaceandmoney.HowardGuydirectoroftheUKcompanyDesignQsaidthedesigncouldseea50percentincreasein50numberofpassengersanda30percentreducedcostofaseat.51hedidadmitthattheseatswouldnotbecomfortableastraditionalones.Anotherdrawbacktotheseatingdesignis52foodcartswouldnotbeabletopassdowntheplane53theaisles走廊aretoonarrow.Sometravelershavedoubtsaboutthenewseatingwhile54supporttheidea.Soldiersareusedtotravelinginthatway55haveapositivereactiontotheideaGuysaid.
8分Forcenturiesmedicalpioneershaverefinedavarietyofmethodsandmedicinestotreatsicknessinjuryanddisabilityenablingpeopletolivelongerandhealthierlives.Asalamanderasmalllizard﹣likeanimalcangrowbackitsleg.Whycan'tahumandothesameaskedPeruvian﹣bornsurgeonDr.AnthonyAtalainarecentinterview.Thequestionareferencetoworkaimingtogrownewlimbsforwoundedsoldierscapturestheinventivespiritofregenerativemedicine.Thisinnovativefieldseekstoprovidepatientswithreplacementbodyparts.Thesepartsarenotmadeofsteel;theyaretherealthings﹣﹣﹣livingcellstissueandevenorgans.Regenerativemedicineisstillmostlyexperimentalwithclinicalapplicationslimitedtoproceduressuchasgrowingsheetsofskinonburnsandwounds.Oneofitsmostsignificantadvancestookplacein1999whenaresearchgroupatNorthCarolina'sWakeForestInstituteforRegenerativeMedicineconductedasuccessfulorganreplacementwithalaboratory﹣grownbladder.SincethentheteamledbyDr.Atalahascontinuedtogenerateavarietyofothertissuesandorgans一fromkidneystoears.Thefieldofregenerativemedicinebuildsonworkconductedintheearlytwentiethcenturywiththefirstsuccessfultransplantsofdonatedhumansofttissueandbone.Howeverdonororgansarenotalwaysthebestoption.Firstofalltheyareinshortsupplyandmanypeoplediewhilewaitingforanavailableorgan;intheUnitedStatesalonemorethan100000peoplearewaitingfororgantransplants.Secondlyapatient'sbodymayultimatelyrejectthetransplanteddonororgan.Anadvantageofregenerativemedicineisthatthetissuesaregrownfromapatient'sowncellsandwillnotberejectedbythebody'simmunesystem.Todayseverallabsareworkingtocreatebioartificialbodyparts.ScientistsatColumbiaandYaleUniversitieshavegrownajawboneandalung.AttheUniversityofMinnesotaDorisTaylorhascreatedabeatingbioartificialratheart.Dr.Atala'smedicalteamhasreportedlong﹣termsuccesswithbioengineeredbladdersimplantedintoyoungpatientswithspinabifidaabirthdefectthatinvolvestheincompletedevelopmentofthespinalcord.AndattheUniversityofMichiganH.DavidHumeshascreatedanartificialkidney.Sofarthekidneyprocedurehasonlybeenusedsuccessfullywithsheepbutthereishopethatonedaysimilarkidneywillbeimplantableinahumanpatient.Thecontinuingresearchofscientistssuchasthesemayeventuallymakedonororgansunnecessaryandasaresultsignificantlyincreaseindividuals'chancesofsurvival.62.InthelatestfieldofregenerativemedicinewhatarereplacementpartsmadeofA.Donatedcellstissuesandorgans.B.Rejectedcellstissuesandorgans.C.Cellstissuesandorgansofone'sown.D.Cellstissuesandorgansmadeofsteel.63.WhathavescientistsexperimentedsuccessfullyonforabioartificialkidneyA.Patients.B.Rats.C.Sheep.D.Soldiers.64.WhyisgenerativemedicineconsideredinnovativeA.Itwillprovidepatientswithreplacementsofttissues.B.Itwillstrengthenthehumanbody'simmunesystem.C.Itwillshortenthetimepatientswaitingforadonatedorgan.D.Itwillmakepatientslivelongerwithbioartificialorgans.65.Whatisthewriter'sattitudetowardsregenerativemedicineA.Positive.B.NegativeC.DoubtfulD.Reserved.
1分MyvoicewassolittleandtheshopownerhadtobenddowntohearIwantedtobuy. A.whatitwas B.itwaswhat C.whatitwasthat D.whatwasthat
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现有硫酸铜溶液氢氧化钾溶液碳酸钠溶液氯化钠溶液和稀硫酸五种溶液．鉴别它们可按如图所示的步骤进行操作．提示碳酸钠溶液呈碱性 1步骤①中通过观察可以鉴别出硫酸铜溶液． 2步骤③用试剂Y鉴别氢氧化钾溶液和碳酸钠溶液时试剂Y可以选用不同类别的物质． ①若试剂Y为酸写出有气体生成的反应的化学方程式． ②若试剂Y为碱写出有沉淀生成的反应的化学方程式．
人的生存离不开空气．如图为空气成分示意图其中R指的是
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下列关于物质用途的说法错误的是
阜新市目前正在大力推进“创建全国文明卫生城市”的活动下列做法不符合这一活动要求的是
25分请阐述一件2015年你最期待的事情谈谈你期待的原因及你在2015年的打算. 注意:1.词数不少于120个; 2.不能使用真实姓名和学校名称. .
铁是生产生活中应用很广泛的一种金属．如图是与铁的性质有关的部分实验请回答下列问题． 1A实验中细铁丝燃烧的现象是． 2B实验中铁丝最易生锈的部位是填“a”“b”或“c”．铁生锈实际上是铁与共同作用的结果． 3C实验中刚开始无气泡产生溶液颜色逐渐由无色变为黄色此时试管内发生反应的化学方程式为． 4D实验能证明铁的活动性比银的强该实验设计的理论依据是．
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