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用足量的CO还原32g某种氧化物，将生成的气体通入足量澄清石灰水中，得到60g沉淀，则该氧化物是（ ）
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Fe2O3CuO的固体混合粉末ag在加热条件下用足量CO还原得到金属混合物2.41g将生成的CO2气
3.21
3.59
4.01
7.41
准确称取某种铁的氧化物2.88g用足量的CO进行还原将生成的C.02全部用足量的澄清石灰水吸收得到沉
Fe
3
O
4
Fe
2
0
3
FeO
以上都不是
将Fe2O.3ZnOCuO的固体混合粉末ag在高温条件下用足量CO还原得到金属混合物2.41g将生成
2.46
3.21
3.59
7.41
Fe2O3ZnOCuO的固体混合粉末ag在加热条件下用足量CO还原得到金属混合物2.41g将生成的C
7.41
3.59
3.21
2.46
某种铁的氧化物20g在加热条件下通入足量的一氧化碳完全反应后将生成的气体用石灰水完全吸收得沉淀37.
2：3
7：2
7：3
21：8
用足量的CO还原13.7g某铅氧化物把生成的CO2全部通入到过量的澄清石灰水中得到的沉淀干燥后质量为
PbO
Pb
2
O
3
Pb
3
O
4
PbO
2
用足量CO原14g铁的氧化物或铁的氧化物的混和物将生成的CO2通入澄清的石灰水中得到25g沉淀则该物
FeO、Fe
2
O
3
Fe
2
O
3
、Fe
3
O
4
FeO、Fe
3
O
4
Fe
2
O
3
将一定量的木炭在盛有32g氧气的密闭容器中燃烧氧气完全反应将生成的气体通入足量的澄清石灰水中生成50
12%
24%
36%
50%
用足量的一氧化碳还原14.5g铁的氧化物的混合物将生成的气体通入足量的澄清石灰水中生成沉淀25g则该
Fe
2
O
3
、Fe
3
O
4
、FeO
FeO、Fe
3
O
4
Fe
3
O
4
、Fe
2
O
3
FeO、Fe
2
O
3
有mg铁的氧化物纯品用足量的CO在高温下将其还原把生成的CO2通入含0.01molCaOH2的澄清石
用足量的CO还原32.0g某种氧化物将生成的气体通入足量澄清石灰水中得到60g沉淀则该氧化物是
FeO
Fe
2
O
3
CuO
Cu
2
O
将一定量的木炭在盛有32g氧气的密闭容器中燃烧氧气完全反应将生成的气体通入足量的澄清石灰水中生成5
12%
24%
36%
50%
准确称取某种铁的氧化物2.88g用足量的CO进行还原将生成的CO2全部用足量的澄清石灰水吸收得到沉淀
Fe
3
O
4
Fe
2
O
3
FeO
以上都不是
将一定量的木炭在盛有32g氧气的密闭容器中燃烧氧气完全反应将生成的气体通入足量的澄清石灰水中生成5
用足量的CO还原32g某种氧化物将生成的气体通入足量澄清石灰水中得到60g沉淀则该氧化物是
FeO
Fe
2
O
3
CuO
Cu
2
O
含杂质的Fe2O3固体样品20g高温下用足量的CO完全还原杂质不与CO反应得剩余固体并将生成的CO2
通入CO质量大于8.4g
反应后剩余固体质量为6.8g
样品中氧化铁的质量分数为80%
上述反应过程中没有置换反应
用足量的CO还原32g某种金属氧化物将生成的气体通入足量的澄清石灰水中得到60g沉淀则该氧化物是
FeO
Fe
2
O
3
CuO
Cu
2
O
有0.4g铁的氧化物用足量的CO在高温下将其还原把生成的CO2全部通入足量澄清石灰水中得到0.75g
Fe
2
O
3
FeO
Fe
3
O
4
FeO、Fe
2
O
3
Fe2O3CuO的固体混合粉末ag高温下用足量CO还原得到金属混合物2.40g将生成的CO2气体用足
2.45
3.20
4.00
7.40
用足量的CO还原8.0g某种铁的氧化物生成的气体全部被足量的澄清石灰水吸收得到沉淀12.5g则这种铁
FeO
Fe
2
O
3
与Fe
3
O
4
的混合物
FeO与Fe
3
O
4
的混合物
Fe
3
O
4
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将下列固体分别放入水中溶液温度明显降低的是
英语课上老师要求同桌同学相互修改作文.假设以下小作文为你同桌所写请你对其进行修改.文中共有10处错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏词符号^并在此符号下面写出该加的词. 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. 3.必须按答题要求做题 Akindoflittlecarmaysomedaytakeaplaceoftoday'sbigones.Ifpeopledrivesuchcarsinthefuturetherewilllesspollutionintheairandmorespacesforparkingcarsincities.Thestreetswillbelesscrowd.Anddrivingwillbesafeastheselittlecarscangoonly65km.perhour.Howeverthelittlecarswillbefineforgettingroundacitysotheywillnotbeusefulforlongtrips.Ifbigcarswerestillusedalongwiththesmallonestwosetsofroadsthatwillbeneededinthefuture.Onesetisforthebigfastcarsandtheanotherfortheslowsmallones.Whichisbelievedthatmorepublicresourceswillbewasted.
ACanadianwomanwholostherdiamondring13yearsagowhilecleaninghergardenonthefamilyfarmiswearingitproudlyagainafterhewdaughter﹣in﹣lawpulleditfromthegroundoracarrot. MaryGrams84saidshecan'tbelievetheluckycarrotactuallygrewthroughandaroundthediamondringshehadlonggivenuphopeoffinding.ShesaidshenevertoldherhusbandNormanthatshelosttheringbutonlytoldherson.Herhusbanddiedfiveyearsago. IfeelgladandhappyGramssaidthisweek.Igrewintothecarrot.Ifeelitamazing Herdaughter﹣in﹣lawCalleenDaleyfoundtheringwhilegettingcarrotsinforsupperwithherdogBillyatthefarmnearArmenaAlbertawhereGramsusedtolive.Thefarmhasbeeninthefamilyfor105years.DaleysaidwhileshewaspullingthecarrotsandnoticedoneofthemlookedstrangeShealmostfedittoherdogbudecidedtokeepitWhenshewaswashing;thecarrotsshenoticedtheringandspoketoherhusbandGrams'sonaboutwhatshehadfound. TheyquicklycalledGrams.ItoldherwefoundherringinthegardenShecouldn'tbelieveitDaleysaid.Itwassostrangethatthecarrotgrewperfectlythroughthatring. GramssaidshewantedtotrytheringonagainaftersomanyyearsWithherfamilylookingonshewashedtheringwithalittlesoaptogetthedirtoff.Itmovedonherfingeraseasilyasididwhenherhusbandgaveittoher. Wewerelaughingshesaid.Itfits.Aftersomanyyearsitstillfitsperfectly. 1HowoldwasGramswhenshelostherdiamondring? A.13. B.71. C.84. D.105. 2Whofoundthewoman'slong﹣lostdiamondring? A.MaryGrams. B.Norman. C.ColleenDaley. D.Billy. 3Thispassagemainlytellsusthat. A.aCanadianwomanlostherring B.along﹣lostringwasfound C.thefamilyfarmhasalonghistory D.astrangecarrotwaspulled
下列关于二氧化碳的用途描述错误的是
JohnSmithwasawriterwhowrotedetectivestoriesformagazinesthoughheneverdealtwithcriminals.Oneeveninghecouldnotfinishanendforastory.Hesatinhisstudybuthehadnoideas.Sohedecidedtogotothecinema. Whenhecamebackhefoundthathehadhadavisitor.Someonehadbrokenintohishouse.Thevisitorhadhadadrinksmokedseveralofhiscigarettesandhadreadhisstory.Thevisitorlefthimanote. IhavereadyourstoryandIdon'tthinkitisverygood.Pleasereadmysuggestionsandyoucanfinishit.BythewayIamathief.I'mnotgoingtostealanythingtonight.ButifyoubecomeasuccessfulwriterIwillreturn. Johnreadthethief'ssuggestions.Thenhesatdownandwrotetherestofthestory.Heisstillnotasuccessfulwriterandheiswaitingforhisvisitortoreturn.Beforehegoesoutintheeveninghealwaysleavesahalf﹣finishedstoryinhisstudy. 1Johnwenttothecinemabecause. A.hewastootired B.hewantedtolookforathief C.hecouldnotfinishhisstoryandhopedtogetsomeideas D.hewantedtoenjoyhimselfinthecinema 2ThevisitorcametoJohn'shouseinorderto. A.stealsomething B.readthestory C.haveadrink D.visitthewriter 3Thevisitor. A.stayedinJohn'shouseforanight B.tooksomeofJohn'sthingsaway C.leftJohnsomeadvice D.wasagoodfriendofJohn's 4Johnwouldliketo. A.haveatalkwithhisvisitor B.getmoreideasfromthevisitor C.makefriendswiththevisitor D.catchthevisitorandtakehimtothepolice
有XYZ三种金属把Y投入XNO32溶液中Y表面有X析出把X投入ZNO32溶液中X表面有Z析出．XYZ三种金属的活动性由强到弱的顺序是
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