首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
锰的化合物在工业、医疗等领域有重要应用．某兴趣小组模拟制备KMnO4及探究锰（Ⅱ）盐能否被氧化为高锰（Ⅶ）酸盐． Ⅰ．KMnO4的制备：MnO2K2MnO4→…KMnO 反应原理 步骤一：3M...
查看本题答案
包含此试题的试卷
高三下学期化学《》真题及答案
点击查看
你可能感兴趣的试题
某学习兴趣小组讨论辨析以下说法①通过化学变化可以实现16O.与18O.间的相互转化②灼烧钠的化合物时
①②
③⑤
①③④
③⑤⑥
某兴趣小组以乙烯等为主要原料合成药物普鲁卡因已知1对于普鲁卡因下列说法正确的是________A.一
工业上应用的重要催化加氢反应类型主要有含氧化合物加氢含氮化合物加氢和氢解几种类型
芳烃加氢
不饱和键的加氢
醚加氢
脂肪烃加氢
锰化合物和锰尘重要是通过消化道侵人人体
某兴趣小组以乙烯等为主要原料合成药物普鲁卡因已知1对于普鲁卡因下列说法正确的是________A.一
美术兴趣小组有学生x人科学兴趣小组的人数比美术兴趣小组的2倍少5人合唱兴趣小组的人数是美术兴趣小组的
显示网状纤维的方法有多种在其染液中通常均含有
铁化合物
铝化合物
铜化合物
锰化合物
银化合物
某校共有三个兴趣小组分别为体育书法和美术已知参加这三个兴趣小组的学生分别是25人24人30人同时参加
74
72
70
69
某学习兴趣小组讨论辨析以下说法其中说法正确的是①通过化学变化可以实现16O.与18O.间的相互转化②
③⑤⑥
①②
③⑤
①③④
锰的化合物有多种价态在真溶液中锰的化合价是
五价
二价
四价
三价
六价
工业上应用的重要催化加氢反应类型主要有不饱和键的加氢含氧化合物加氢含氮化合物加氢和氢解几种类型
某学校数学兴趣小组有10名学生其中有4名女学生英语兴趣小组有5名学生其中有3名女学生现采用分层抽样方
不饱和酯类化合物在药物涂料等领域应用广泛.下列反应是一种由烯烃制备不饱和酯的新方法1化合物I.的分子
某校共有三个兴趣小组分别为体育书法和美术已知参加这三个兴趣小组的学生分别是25人24人30人同时参加
74
72
70
69
某研究学习小组经过查阅资料发现锰Mn也能排入下列金属活动性顺序中KCaNaMgAlMnZn①②③④C
某校共有三个兴趣小组分别为体育书法和美术已知参加这三个兴趣小组的学生分别是25人24人30人同时参加
74
72
70
69
河流的水质直接影响到城市居民的生活质量某环保兴趣小组的学生对学校周围的河水进行了以下几方面的实验探
单质
纯净物
混合物
化合物
工业上应用的重要催化加氢反应类型主要有不饱和键的加氢芳环加氢含氧化合物加氢含氮化合物加氢和几种类型
某研究学习小组经过查阅资料发现锰Mn也能排入下列金属活动性顺序中K.CaNaMgAlMnZn①②③④
某学习兴趣小组讨论辨析以下说法其中说法正确的是①通过化学变化可以实现16O.与18O.间的相互转化②
③⑤⑥
①②
③⑤
①③④
热门试题
更多
如图所示关系图其中“——”表示相互反应“→”表示转化关系． 1右图中物质X是 2写出实现转化③的一个反应方程式 3转化⑤中Fe3O4发生反应选填“氧化”或“还原” 4图中实现①—⑤的反应中一定是化合反应的是
Itisreportedthatmanymiddleschoolstudentsarejustnotgettingenoughsleepespeciallyduringtheschoolweek.Theproblemseemstoget1badastheygetolder.Year7studentssleep8.4hoursinaschoolnightandYear9studentsonly6.9hours. It'salsoreportedthatnotgettingenoughsleepcancause2probleminastudent'slife.Manystudentsfall3sleepatschoolorwhiledoingtheirhomeworksoitisnot4surprisethattheygetlowergradesthanthosewhogetenoughsleep.Scientistssuggestninehoursanightformiddleschoolstudents.5thestudentswhofeelunhappyandnervous73%don'tgetenoughsleepatnight. Whyaren'tstudentsgettingenoughsleep?Manystudentshaveoneofthe6followthingsliketelephonetelevisionorcomputerintheirbedrooms. 7usethemonaschoolnightnotonlytakestheirtimeawayfromhomeworkbutalsomakes688difficultforthemtosleep.Asaresultmanystudentscan'tsleepbefore11pmyettheymustgetupearly9gotoschool. Scientistsalsosuggeststudentsshouldnotdoexcitingactivitiesforanhour10bedtime.
下列关于热机和环境保护的说法中正确的是
请运用“守恒”的思想回答下列问题． 古代“银针验毒”的原理是4Ag+2H2S+O22X+2H2O根据化学反应前后推出X的化学式为Ag2S．
按要求回答下列问题． 地壳中含量最多的元素符号是
Theywantpracticetheirhobbiesasmanyastheywant.
如图将线段AB绕点O顺时针旋转90°得到线段A'B'那么A﹣25的对应点A'的坐标是
下图是实验室制取气体时常用的仪器回答下列问题1仪器A的名称是2实验室制取二氧化碳的化学反应方程式是3①组装一套制取二氧化碳气体的装置时若选用了标号为AGHIJO的仪器还应选用所给仪器中的②用上述装置制取CO2检验集气瓶内已经收集满CO2气体的操作是4在实验室里用加热高锰酸钾来制取氧气时除合理选用题中所给仪器外还必须补充的一种玻璃仪器是5选择气体制取装置时要考虑反应物状态和气体的性质．
北方冬天常用水作为工作物质向千家万户供暖用水作为工作物质主要是利用水的
FourBenefitsofWritingbyHand TodayisNationalHandwritingDay!Althoughwedon'twritelikeweusedtoherearefourwayshandwritingisstillhelpful. It'sbetterforlearning. 1That'sbecauseputtinginktopaperstimulates刺激thebrain.Onestudyfrom2010foundthatthebrainareasrelatedtolearninglitupmuchmorewhenkidswereaskedtowritewordslikespaceshipbyhandversusjuststudyingthewordclosely. 2 Manyfamousauthorspreferwritingbyhandtotheuseofatypewriterorcomputer.WriterSusanSontagoncesaidthatshepennedherfirstdrafts草稿beforetypingthemupforeditinglater.Shesaid3A2009studyseemstosupportSontag'spreferenceforwritingbyhandElementaryschoolstudentswhowroteessayswithapennotonlywrotemorethantheirkeyboardtappingfriendsbuttheyalsowrotefasterandinmorecompletesentences. Itwillpreventyoufrombeingdistracted分心. Thecomputerinfrontofyouisreallyadistraction.4In2012scientistsevensuggestedthattakingfiveminutebreakstobrowseTumblrorBuzzFeedcouldmakeyouamoreproductiveworker.Howeverwhenit'stimetoworkonthatessayhaveonlyapenandpaperinfrontofyou. Itkeepsyourbrainsharpasyougetolder. 5AccordingtoTheWallStreetJournalsomephysicianssaythattheactofwritingisgoodexerciseforthosewhowanttokeeptheirmindssharpastheyage. A.Itmakesyouabetterwriter. B.Writingisgoodforyourbrain. C.OfcoursetheInternetisn'tallbad. D.Iliketheslownessofwritingbyhand. E.Trywritingbyhandatleast20minuteseachday. F.Manywritershaveapreferenceforwritingbyhand. G.Oneofthemosteffectivewaystostudyistorewriteyournotesbyhand.
计算×=
下列化学实验操作正确的是
Whydidhehaveanawithhiswifeyesterday?Hiswifewasverysad.
以AnOutstandingWoman﹣MadameCurie为题目并按下列表格的内容写一篇100词左右的英语短文介绍居里夫人. 注意1.可适当增加细节以使行文连贯 2.标题为AnOutstandingWoman﹣MadameCurie不计入总词数. 参考词汇诺贝尔物理化学奖theNobelPrizeforPhysicsChemistry镭元素radiumelement
Ifvolunteeringbeginsatanearlyageitcanbecomepartofachild'slife﹣somethingheorshemayjustexpectandwanttodo.Itcanteachthem Asenseofresponsibility.Byvolunteeringchildrenandteenslearnhowtobeontimeforajobdotheirbestandbeproudoftheresults.Andtheyalsolearnthatintheendweareresponsibleforthewellbeingofourwholecommunity. Theknowledgethatonepersoncanmakeadifference.Awonderfulmessageforachildisthatheorsheisimportantenoughtohaveaneffortonsomeoneorsomethingelse. Thebenefitofsacrifice奉献的好处.Bygivingupatoytoalessfortunatechildachildlearnsthatitisgoodtosacrificesometimes.Cuttingbackonplayingtimetohelpcleanupastreettellskidsthatthereareimportantthingsotherthanourselvesandourneeds. Tolerance容忍.Workingincommunityservicecanbringkidsandteensintouchwithpeopleofdifferentbackgroundsabilitiesagesandeducation.Theywilllikelyfindthateventhemostdiversepeoplecanbeunitedbycommonvalues. Jobskills.Communityservicecanhelpyoungpeopledecideontheirfuturecareers.Learningtoworkasateammembertakingonleadershiprolessettingprojectgoals﹣theseareallskillsthatcanbelearnedbyvolunteeringandwillserveachildwellinanyfuturecareer. Howtofillfreetimewisely.Ifachildisnotinterestedintraditionalafterschoolactivitiescommunityservicecanbeawonderfulchoice. 1Youhelpastudentwhocan'tgotoschoolbecauseofmoney.Thatisabout. A.asenseofresponsibility B.jobskills C.tolerance D.thebenefitofsacrifice 2Ifyouhavetogetonwithallkindsofclassmates﹣hardworkingorlazyworkaholicorplayfirstpoliteorrudeetc.whatyouneedmostis. A.tolerance B.theknowledgethatonepersoncanmakeadifference C.thebenefitofsacrifice D.asenseofresponsibility 3TheunderlinedworddiverseinPara.5probablymeans. A.interesting B.different C.personal D.selfish 4Whatwouldbethebesttitleforthispassage? A.WhattoDoasaVolunteer B.WhatYouCanLearnfromVolunteering C.HowtoBeaGoodVolunteer D.LearntoBeaVolunteer
下列实验现象的描述错误的是
Residents居民inthepoorestareasintheU.S.facealifeexpectancy平均寿命uptodecadeshorterthanthoseinthewealthiestareasaccordingtoastudypublishedintheAmericanJournalofPublicHealth. ResearchersfromEastTennesseeStateUniversitywantedtobetterunderstandhowsocioeconomicstatuswasassociatedwithhealthoutcomes.Tofindouttheydividedthecountry's3141areasinto50newstateswith2percentoftheareasineachbasedonhouseholdincomeratherthanongeography. Theresearchersbrokedownthedatabycounty郡县sincetheyfoundstate﹣leveldatamayhidesomeeffectofsocioeconomicdifferencesonboththebest﹣offandworst﹣offcounties.Theythenexaminedhealthdatafromthewealthiestandpooreststatestopandbottom2percenttoseehowresidentsdifferedonfactorslikesmokingclinicalcareandexcessive过多的drinking.Researchersfoundthattherewasnearlya10﹣yeargapinthelifeexpectancyofmenwithanaverageof79.3yearsinthewealthycountiescomparedto69.8yearsinthepoorest.Forwomenthedifferencewasslightlyless83yearsinthewealthiestcountiesand76yearsinthepoorest. Thestudyauthorswerecautiousthatwhiletheyfoundaconnectionbetweensocioeconomicstatusandhealthoutcomestheydidnotanalyzecauseandeffect.Buttheysuggestthatthedatashowshowpolicymakersshouldnotjustfocusonstate﹣wideinitiatives主动性butmoretargetedeffortstohelpthosemostatrisk.Withlimitedresourcesmethodsofknowingthepoorestareasexactlycanbequitesignificantintheequaldistribution分配ofresourcesandprogramstothosecommunitiesthatareinthegreatestneed''thestudyauthorswrote. 1HowdidResearchersdividetheareas? A.Bysocialstatus B.Byincome C.Byhealth D.Bylivingplaces 2WhichofthefollowingisTRUEaccordingtoParagraph3? A.Thewomendifferenceislessthanthemaninlifeexpectancy. B.Thewealthieststatelikehidingtheirwealth. C.Mosthealthdataisunbelievable. D.Mostpooreststatesmokeanddrinkalot. 3Whatcanweinferfromthelastparagraph? A.Theresearchersthinktheirstudyisperfect. B.Peoplestilldon'tknowthecauseoflifeexpectancy. C.Thegovernmentshouldlearnsomethingfromthestudy. D.TheAmericanresourcesdistributionisnotfairatall. 4Whatwouldbethebesttitleforthepassage? A.Waystohavealonglifeexpectancy B.GreatincomedifferencesintheUSA C.ThehealthproblemintheUSA D.Meninrichest10yearslongerinpoorest
按要求回答下列问题． 水分子可用符号表示为
父亲使我牢记努力工作的价值.impress…on
下列实验设计无法达到实验目的的是
I'msittinginmykitcheninLondontryingtofigureoutatextmessagefrommybrother.HelivesinourhomecountryofGermany.WespeakGermantoeachotheralanguagethat'srichinstrangewordsbutI'veneverheardthisonebeforefremdschämen. Theexperiencegetsmetoconsidercanweloseourmotherlanguage?Mostimmigrants移民knowwhatit'sliketobenotasgoodattheirmotherlanguageasbefore.Theprocessseemsobviousthelongeryouareawaythemoreyourlanguagesuffers.Butit'snotquitesostraightforward.Itturnsoutthathowlongyou'vebeenawaydoesn'talwaysmatter.Socializingwithothernativespeakersabroadcanworsenyourownnativeskills.Andemotionalfactorsliketrauma精神创伤canbethebiggestfactorofall. Inchildrenthephenomenonoflanguageattrition语言磨蚀issomewhateasiertoexplainsincetheirbrainsaregenerallymoreflexibleandadaptable.Untiltheageofabout12aperson'slanguageskillsarerelativelyeasytochange.Studiesoninternationaladoptershavefoundthatevennine﹣year﹣oldscanalmostcompletelyforgettheirfirstlanguagewhentheyareremovedfromtheircountryofbirth. Butinadultsthefirstlanguageisunlikelytodisappearentirelyexceptinextremecircumstances.ForexampleMonikaSchmidanalyzedtheGermanofelderlyGerman﹣Jewishwartimerefugees难民intheUKandtheUS.Themainfactorthatinfluencedtheirlanguageskillswasn'thowlongtheyhadbeenabroadorhowoldtheywerewhentheyleft.Itwashowmuchtraumatheyhadexperiencedasvictims.ThosewholeftGermanyintheearlydaysofNazioccupationbeforetheworstviolencetendedtospeakbetterGerman﹣despitehavingbeenabroadthelongest.ThosewholeftlatertendedtospeakGermanwithdifficultyornotatall. ItseemedveryclearlyaresultofthistraumasaysSchmid.EventhoughGermanwasthelanguageofchildhoodhomeandfamilyitwasalsothelanguageofpainfulmemories.Themosttraumatizedrefugeeshadheldthemback.AsoneofthemsaidIfeelthatGermanybetrayedme.AmericaismycountryandEnglishismylanguage. 1Whatdoesthefirstparagraphserveas? A.Acomment B.Abackground C.Anexplanation D.Anintroduction 2Whatdoparagraph4and5mainlytalkabout? A.Howtwolanguagescoexist B.Thewaytodealwithadult'strauma C.Thereasonsbehindadult'slanguageattrition. D.Whethertraumaleadstoadult'slanguageattrition. 3Whydoestraumacauseaperson'smotherlanguagetodisappear? A.Becausehecan'trememberhismotherlanguage. B.Becausehisabilitytocommunicateisaffected. C.Becausehiscountryisfarfromhim. D.Becausehechoosestoescapefrombadexperiences. 4Whatisthebesttitleforthepassage? A.Wheredoesyournativelanguagecomefrom? B.Willyouloseyournativelanguage? C.Howdoestraumaaffectyourfirstlanguage? D.Howfarareyoufromyourmothertongue
—Haveyougettoclasslate?—Notyet.
—Ihearyouhavetoexerciseearlyinthemorning.—Right.It'soneoftheinmyfamily.A.plans B.members C.rules D.suggestions
请回答下列与含碳物质有关的问题 CO和CO2都是碳的氧化物但由于它们的不同导致化学性质不同．要鉴别它们可分别向两瓶气体中滴加
如图抛物线y=ax2+bx+c与x轴交于AB两点与y轴交于C点且A10C03抛物线的对称轴为x=-11求抛物线的解析式2在该抛物线的对称轴上是否存在点M使得M到AC距离之和最小若存在求出点M的坐标若不存在请说明理由3该抛物线在第二象限的图象上是否存在一点P使四边形BOCP的面积最大若存在求出点P的坐标若不存在请说明理由4EF分别在抛物线和x轴上以EFBC为顶点的四边形为平行四边形．
Look！Thereissomething漂浮ontheriver
HomestayinSydneyAustralia 1Fourpersonswrotethesepassagessoasto. A.lookforsuitableroommates B.searchforhomestayinformation C.bookasuitableroominSydney D.advertiseroomsforhomestay 2OnepersonwholivesinJohn'sapartment. A.cansmokeintheapartment B.canuseJohn'swashingmachinetowashclothes C.hastowalkalongwaytogettothesportsfield D.isprovidedwithbreakfastandlunchonweekdays 3IfPeterwantstofindahomestayroomnearSydneyUniversityheshouldsendanemailto. A.markalarms@optusnet.com.au B.mineanny@hotmail.com C.cliqi9239@hotmail.com D.ainsleygilkes@yahoo.com.au
ManychildrendreamofbecomingmanagerswhentheygrowupbutveryfewstartasearlyasJoseAdolfoQuisocalaCondoriaPeruvian秘鲁boywhostartedachildren'ssavingsbankwhenhewasonly7yearsold.Todayhisbankhasbeen1toserveover2000clients客户. Sixyearsagohe2thatmanyofhisfriendswerespendingtheirmoneyonsweetsandtoys3savingitformoremeaningfulpurchases.Despitehisyoungagehe4thatsavingmoneyandaccessingthe5systemweretwowaysthatadultssolvedmanyoftheirmoneyproblemssohedecidedtomakethem6tokidsaswell.Hethenstarted7waysthatchildrencouldmakemoneywithoutthehelpoftheirparentsandrecyclingseemedlikethe8answer.Butwhenhecameupwithhisideaforachildren'sbanktohisteachershewastoldthata7﹣year﹣oldcouldn'tdealwithsuchan9.Butfinallyhe10themallwrong. AtthebeginningmyteachersthoughtIwascrazyJoserecalls.LuckilyIhadthe11oftheschoolheadmasterwithwhosehelphe12abankwherechildrencouldbecomeclientsbyturninginatleast5kilogramsof13wasteandwererequiredtosaveatleastoneotherkilogramofwasteeverymonth.Theywouldthensetasavings14andcouldonlygetmoneyfromtheir15whentheyreachedit. Between2012and2013hisbank16onetonofwasteandserved200childrenattheschool.Itwasareal17drawingalotofattentionandhe18co﹣workedwithalargebanktomakethiskindof19accessibletomorechildren. Forhisachievementshehasreceivedseveralhonoraryawardsforhelpingkidswiththeir20ofmoney. 1A.expanded B.founded C.predicted D.recommended 2A.admitted B.noticed C.doubted D.supposed 3A.asfor B.dueto C.insteadof D.incaseof 4A.suspected B.insisted C.decided D.understood 5A.social B.educational C.emotional D.financial 6A.available B.attractive C.amazing D.important 7A.puttingup B.thinkingof C.turningdown D.callingfor 8A.practical B.merciful C.fluent D.curious 9A.attitude B.honor C.story D.project 10A.felt B.demanded C.imagined D.proved 11A.attack B.injury C.support D.refusal 12A.setup B.calledup C.broughtup D.tookup 13A.recyclable B.useless C.precious D.harmful 14A.trade B.goal C.course D.limit 15A.school B.parents C.accounts D.materials 16A.selected B.removed C.explored D.collected 17A.matter B.hit C.burst D.campaign 18A.again B.just C.even D.still 19A.wastes B.plans C.services D.rules 20A.appointment B.management C.argument D.judgment
热门题库
更多
高二下学期化学
高二下学期生物
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
国际法
教案备课库
教案备课库
湘公网安备 43130202000226号