首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
下列气体不能用碱石灰干燥的是( )
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
下列气体既能用浓硫酸干燥又能用碱石灰干燥的是
Cl
2
NH
3
SO
2
N
2
固体NaOH和CaO的混合物叫做碱石灰常用作干燥剂.下列气体不能用碱石灰干燥的是
CO
CO
2
H
2
O
2
固体氢氧化钠和氧化钙的混合物叫做碱石灰常用作干燥剂下列气体不能用碱石灰干燥的是
CO
CO
2
H
2
O
2
碱石灰干燥剂是由固体NaOH和CaO组成的混合物能用它来干燥的气体有
O
2
HCl
CO
2
SO
2
为了更简便制取干燥的NH3下列方法中合适的是
氯化铵与浓硫酸混合加热,生成的气体用碱石灰进行干燥
N.
2
与H.
2
在一定条件下化合成NH3,用烧碱干燥
加热浓氨水,气体用碱石灰干燥
加热NH
4
HCO
3
,气体用P.
2
O.
5
干燥
下列方法中不能用于实验室里制取氨气的是
加热烧瓶中的浓氨水
加热试管中的熟石灰和氯化铵固体的混合物
将分液漏斗中的浓氨水滴入装有生石灰的烧瓶中
加热试管中的氯化铵固体,并将产生的气体通过装有碱石灰的干燥管
下列气体不能用碱石灰氢氧化钠固体和生石灰的混合物干燥的是
H
2
Cl
2
NH
3
CO
固体氢氧化钠和氧化钙的混合物叫做碱石灰常用作干燥剂.下列气体不能用碱石灰干燥的是
CO
CO
2
H
2
O
2
下图是实验室常用的制取和收集干燥气体的装置碱石灰是CaO和NaOH固体的混合物1写出图中有标号仪器的
在HClCl2O2NH3NO2CO2H2SO2等中1不能用浓硫酸干燥的气体有____________
下列各组气体既能用浓硫酸干燥又能用碱石灰干燥的是
NH
3
、H
2
、Cl
2
O
2
、CO
2
、CO
HCl、O
2
、H
2
H
2
、 N
2
、CH
4
下列气体中既能用浓硫酸干燥又能用碱石灰干燥的是
NH
3
;
SO
2
;
N
2
;
NO
2
在通常情况下既能用浓硫酸干燥又能用碱石灰干燥的气体是
NH
3
Cl
2
H
2
HCl
下列气体不能用碱石灰氢氧化钠固体和生石灰的混合物干燥的是
H
2
Cl
2
NH
3
CO
下列气体中既能用浓硫酸干燥又能用碱石灰干燥的是
O
2
SO
2
NH
3
Cl
2
下列常用的干燥剂中不能用来干燥氯气的是
浓硫酸
无水氯化钙
碱石灰
磷酸酐(P
2
O
5
)
下列气体既能用浓硫酸干燥又能用碱石灰干燥的是
Cl
2
O
2
SO
2
NH
3
下列气体不能用碱石灰氢氧化钠固体和生石灰的混合物干燥的是
H
2
Cl
2
NH
3
CO
下列气体中不能用碱石灰干燥的是
氧气
二氧化碳
氢气
一氧化碳
固体氢氧化钠和氧化钙的混合物叫做碱石灰常用作干燥剂下列气体不能用碱石灰干燥的是
热门试题
更多
25分假如你是校报负责人急需在学校内聘一位同学任英文版的编辑请你用英文以AnEnglishEditorWanted为题目写一则招聘启事.内容要如下 1该工作主要包括两部分一是从英文报刊杂志及互联网上选择适合文章二是选择与编辑同学们的来稿. 2希望该同学满足下列要求 ①乐意奉献出业余时间 ②英文与美术皆好熟练使用电脑. ③感兴趣的同学请在本周内与学生会Students'Union联系. 注意1词数80左右2不要逐字翻译要组成一篇通顺连贯的短文. AnEnglishEditorWanted
3分已证实他极具音乐天赋.他的每次表演都会给观众们留下深刻的印象.confirmgiftimpression .
已知O为△ABC内一点且则△AOC与△ABC的面积之比是.
设集合A={﹣202}B={x|x2﹣x﹣2=0}则A∩B=
已知ab都是实数那么“2a>2b”是“a2>b2”的
函数fx=的图象大致为
已知向量满足||=1=﹣1则•2=
已知函数fx=x2﹣a+1x+1a∈R. 1若关于x的不等式fx<0的解集是{x|m<x<2}求am 2设关于x的不等式fx≤0的解集是A集合B={x|0≤x≤1}若A∩B=∅求实数a的取值范围.
已知正方形ABCD的边长为2若将正方形ABCD沿对角线BD折叠为三棱锥A﹣BCD则在折叠过程中不能出现
曲线y=2lnx在点10处的切线方程为.
已知{an}是递增的等差数列a2a4是方程x2﹣5x+6=0的根. 1求{an}的通项公式 2求数列{}的前n项和.
10分InJunetheOxfordEnglishDictionaryorOEDaddedabout1000wordsandnewdefinitionstoitswebsite.Thechangesaretohelpusersunderstandamixoftermssomedatingbackmanycenturies.Theadditionsincludewordssuchasbrencheesedeathshildyandhip﹣pop. Thenewentriesarepartofthecompany'supdatetoOed.comitssearchableonlinedictionaryforpaidmembers.TheOEDmakeschangestothewebsitefourtimeseachyear.Butthelatestprintversionhasbeeninprocesssincetheyear2000andmaynotbereadyfor10moreyears.ThatinformationcomesfromKatherineConnorMartinwhoheadsthecompany'sdictionaryoperationsintheUnitedStates. UsuallytheOEDwatchesusageofawordforatleast10yearsbeforedecidingwhethertoaddanewentrynewdefinitionorwordrelatedtoanexistingentryshesaid.Thisgeneralrulehoweverissometimesnotfollowed.ThatiswhathappenedwithtweetawordthattheOEDaddedfarbeforethe10﹣yearmark.Othertimesthecompanyaddswordsthatareveryoldbutwerenotincludedinthedictionaryinthepast. it'sfunnybecausewetalkaboutnewwordsbutmanyofthewordsweaddarealreadyobsolete.IfsjustthattheywereneverinthedictionarybeforeMartintoldtheAssociatedPress. Thatistherealityshesaidofahistoricaldictionarytryingtoputmorethan1000yearsofEnglishintobooksthatalreadyhaveover855000entries.Soyougetbrencheeseararelyusedtermforwhenbreadandcheeseareeatentogether.Theworddatesbacktotheyear1665.TheworddeathshildyisfromOldEnglish.Itmeanssomeonewhoisguiltyofaseriouscrimeandcondemnedtodeath. Thewebsitedefinesthetermhip﹣popformusicthatcombinespartsofhip﹣hopandpopularmusic.TheOEDdiscoveredthetermhip﹣hippopwasusedina1985storyfromaPennsylvanianewspaper.Itnotedthatthetermhip﹣popappearedina1991U.S.newspaperreportabouttherapartistM.C.Hammer. Thewebsitehasaddedseveralothertermsrelatedtomodernculture.Theyincludethreepopulartermsbinge﹣watchingspoileralertandmicroaggression. Hereareafewothernewentriesifyoulongtoreadon. 1WhathasOEDdonerecently? A.Ithasmadechangestoitswords'explanation. B.Ithassortedoutsomewordswhichareoutofdate. C.IthashelpeduserstohavemoreconvenientuseofOED. D.Ithastakeninmorewordsandnewmeaningsofsomewords. 2Theunderlinedwordobsoleteinparagraph4isclosestinmeaningto. A.deserted B.updated C.changed D.explained 3Whatwilltheparagraphfollowingthepassagemostprobablybeabout? A.TheinfluencecultureshaveonthewordsinOED. B.ThedifficultiesOEDhasinchoosingthewords. C.TheeffectmoderntechnologyhasonOED. D.ThenewvocabulariesOEDhasincluded. 4What'sthebesttitleofthetext? A.OEDAGreatHelpforEnglishLearners B.ABrandNewVersionofOEDWebsite C.ABetterUnderstandingofWordsinOED D.ExamplesofOEDChoosingWords
设为单位向量其中=2+=且在上的投影为2则与的夹角为.
10分Partiesandsocialgatheringsnolongerexciteusthesamewaytheyoncedid.1Atpartiesmorepeopleareontheirsmartphonesthanontheirdrinks.AccordingtoarecentInternationalDataCorporationstudywelloverhalfofallAmericanshaveasmartphoneandreachforitthemomenttheywakeupkeepingitinhandallday.Inadditiontoomuchofsocietyisusingsmartphoneswhiledrivingandasaresultgettingintocarcrashes.34percentofteensadmittotextwhiledriving.2People'sattachmenttotheirsmartphonesisunbelievablybecomingmoreimportantthanthelivesofthemselvesandothers. Justasdriversdismisstheimportanceoffocusingwhiledrivingontheroadmanypeoplealsofailtorecognizethesignificanceofhumaninteraction.Wearestartingtogetusedtopeopleseeminglytalkingthemselveseverywhere.3ItisactuallysendingamessagetothatfriendthepersonIamtextingismoreimportantthanyou.Inadditionrelyingonoursmartphonestomakefriendsdoesnotgiveusthesameadvantageasbeingabletomakenewfriendshipsintherealworld.4. Asmanypeoplerisktheirlivesandthelivesofpeoplearoundthemjusttosendatextormindlesslychecktheirmassagessmartphonesareinmanywaysmoredangeroustopeople.Thequalityofthistechnologyisde﹣advancingsocietalachievementsandweakeningthevalueofcommunication.5. A.Itistruethatwecanmakenewfriendsbyusingsmartphones. B.Thisisnotduetoalackofdesiretosocializebutthesmartphones. C.Overdependenceonthesmartphonegivesrisetomanyproblems. D.Andtheyconfirmthattextmessagingistheirnumberonedrivinginterruption. E.Face﹣to﹣faceconversationswillgiveusmuchstrongercommunicationskillsinthelongrun. F.Notonlyisthesmartphoneaffectingourdesiretointeractface﹣to﹣facebutitisalsoloweringsociety'sabilitytocommunicate. G.Whenwiththeirfriendssomepeoplepointlesslycheckorsendtextmessagesinthepresenceofafriend.
已知函数fx=|x+a|+|x﹣2|. Ⅰ当a=﹣3时求不等式fx≥3的解集 Ⅱ若fx≤|x﹣4|的解集包含[12]求a的取值范围.
九章算术中将四个面都为直角三角形的三棱锥称之为鳖臑若三棱锥P﹣ABC为鳖臑PA⊥平面ABCPA=3AB=4AC=5三棱锥P﹣ABC的四个顶点都在球O的球面上则球O的表面积为
10分Manyuniversitieshavecarriedoutastudyabroadrequirementinorderforstudentstoreceiveadegree.Actuallyyouwillrealizethattravelingitselfisaneducation.1SittinginhistoryisBORING.HonestlyI'dratherhavetotakechemistrythanlistentoahistoryprofessorgoonandonandonaboutacivilizationorsomepeopleIdon'tcareabout. 2WhenIstudiedabroadinGermanyImadealotofconnectionstohistorythatIhadlearnedaboutpreviously.BeingtherewhereeventsactuallytookplacewascoolerthanlookingatpicturesonaPowerPointslide. 3IfyoustudyabroadandhavetotravelwithaclassmateIguaranteeyou'llbeabletoidentifysomeareasforimprovement.IcanremembermultipleinstanceswhereIidentifiedthatIneededtobecomeabettercommunicator.Havingtheexperienceoftravelingwillgiveyousomanymoreperspectivesonlife. Ifyoufeellikeyouhaven'texactlydefinedyouridentityleaveyourhomecountryforasemesterorlonger.Icanguaranteethatyou'llcomebackwithabetterhandleonwhoyouareandwhatyouhavetooffertheworld.4InthosefiveweeksllearnedmoreaboutwhoIamandwhatIrepresentthanthepreviousyearIhadspentonmyhomecampus. You'llreturnhomewithanewfoundappreciationforyourlifeandtheopportunitiesyou'vebeengiven.AfterItraveledaroundEuropeIcamehomesomuchmorethankfultogotoauniversitywithcomfortablehousing.5Icouldn'thavebeenhappiertoshareabathroomwith59other18﹣to22﹣year﹣oIdgirls.Icouldn'thavebeenhappiertogetupformy8a.m.courses. A.Butwhenyoutravelhistorycomestolife. B.Herearesomereasonswhyyoushouldconsidertravelingtoenhanceyourlearning. C.Whenyoutravelyou'llhavetolearnadifferentwayofliving. D.IhadsuchadeepenedappreciationforwhatIhadbeengiven. E.IfoundoutsomanythingsaboutmyselfwhenIwasinGermany. F.Allinalltravelingwillenhanceyourclassroomlearningexperiences. G.Thingslikecommunicationskillscan'talwaysbepolishedinaclassroom
3分学生应该尊重老师并在公共场所举止得体的建议值得考虑.respectbehaveworthwhile同位语从句 .
15分Doyouhavesuchkindofexperience?Inabusyoumaylookatastrangerbutnottoolong.Andifhesensesthathe1stareathemayfeeluncomfortable. Thesamehappensindailylife.Ifyouarelookedatformorethannecessaryyouwilllookatyourselfupanddowntosee2anythingiswrongwithyou.Ifnothinggoeswrongyouwillfeeluncomfortable.Eyesdospeakright? 3looktoolongatsomeonemayseemtoberude.Butthingsaredifferentwhen4comestoastareattheoppositesex.Ifaman5glanceatawomanformorethan10secondsthatmeanshewishestomakeherknowheisadmiringher.Normallythespeakerinconversationwilllookatthelistenerattimestomakesurethatthelistenerdoespayattentionto6theformerissaying.Apoorliarusuallymakeshimself7exposebylookingtoolongatthevictimsincehebelievesinthefalseideathattolookstraightintheeyeisasignofhonest8communicate.Actuallycontinuouseyecontactexistsinloversonlywhowillenjoylookingateachothergentlyforalongtimetoshowlovethatwordscannotconvey. 9evidenteyecontactshouldbedoneaccordingtothespecificsituationandtherelationship10twopeople.
某中学的高二1班男同学有45名女同学有15名老师按照分层抽样的方法组建了一个4人的课外兴趣小组. Ⅰ求某同学被抽到的概率及课外兴趣小组中男女同学的人数 Ⅱ经过一个月的学习讨论这个兴趣小组决定选出两名同学做某项实验方法是先从小组里选出1名同学做实验该同学做完后再从小组内剩下的同学中选一名同学做实验求选出的两名同学中恰有一名女同学的概率 Ⅲ试验结束后第一次做试验的同学得到的试验数据为6870717274第二次做试验的同学得到的试验数据为6970707274请问哪位同学的实验更稳定并说明理由.
如图网格纸上小正方形的边长为1粗实线画出的是某几何体的三视图该几何体由一平面将一圆柱截去一部分后所得则该几何体的体积为
过抛物线Cy2=4x的焦点F且斜率为的直线交C于点MM在x轴上方l为C的准线点N在l上且MN⊥l则M到直线NF的距离为
设函数fx=1﹣x2ex. 1讨论fx的单调性 2当x≥0时fx≤ax+1求a的取值范围.
海水养殖场进行某水产品的新旧网箱养殖方法的产量对比收获时各随机抽取了100个网箱测量各箱水产品的产量单位kg其频率分布直方图如下 1记A表示事件“旧养殖法的箱产量低于50kg”估计A的概率 2填写下面列联表并根据列联表判断是否有99%的把握认为箱产量与养殖方法有关 3根据箱产量的频率分布直方图对两种养殖方法的优劣进行比较. 附 K2=.
对一切不等式x4+a﹣1x2+1≥0恒成立则a的取值范围是
7.5分Filledwithmuchhouseworkmealsandchildcareathomemanypeoplefeelthatbeingatworksoundsmorelikehavingapicnic.Evenforthosewhohaveahappyfamilylifetheyfeelactuallymorestressedathomethanatwork. RecentlyastudycarriedoutbytheresearchersatauniversityintheUSAfoundlowerlevelsofhormone荷尔蒙releasedinresponsetostressinmostsubjectswhentheywereatworkcomparedtowhentheywereathome.Thiswastrueforbothmenandwomenandparentsandpeoplewithoutchildren. Bothmenandwomenshowedlessstressatwork.Butwomenaremorelikelytoreportfeelinghappierthere.Menweremorelikelytofeelhappierathome.Expertssaythereareotherreasonswhyworkislessstressfulthanhomeformany.PaidworkismorevaluedinsocietysaidSarahDamasketheleadresearcheronthestudyHouseholdworkisboringandnotparticularlyrewarding. Wegetbetteratourjobwithtimeandtheincreasedabilitymeanslessstressandmorerewards.Yetnoneofusnomatterhowlongwe'vebeendoingitevertrulyfeelslikeanexpertatparentingorevenatmarriage. Thesupportandfriendshipofco﹣workersalsoofferstressrelief.Athomemeanwhilestressspreadsandincreasesquickly.That'sthereasonwhymosthousewiveswishtheywerethebreadearnersDr.Damaskesays. Muchoftheadvicetofamiliesandcouplesincludesthewarningtoleaveworkstressatofficeandeventochangeourmind﹣setfromworktohomeforexampleawalkaroundtheblock.Therecentfindingsthoughsuggestourhomelifenotourattitudemightbedueforsomechange. 1AccordingtoParagraph1manypeoplefeelthatbeingathome. A.islikehavingapicnic B.isaperfectwaytomanagestress C.offersgreaterrelaxationthanatwork D.canbringmorestressthanintheworkplace 2AccordingtoSarahDamaske. A.menfeelhappieratworkthanwomen B.parentswithoutchildrentendtofeelhappier C.householdworkisnotasrewardingasworkonajob D.bothmenandwomenfeelhappierathomethanatwork 3Accordingtotherecentfindingswhatshouldwechangetosolvetheproblemmentioned? A.Ourattitude. B.Ourhomelife. C.Ourmind﹣set. D.Ourworkingstyle.
甲乙丙丁四位同学一起去问老师询问成语竞赛的成绩.老师说你们四人中有2位优秀2位良好我现在给甲看乙丙的成绩给乙看丙的成绩给丁看甲的成绩.看后甲对大家说我还是不知道我的成绩.根据以上信息则
已知平面内=0||•||=1且=则的最大值等于
若实数a满足a2+a<0则﹣aaa2的大小关系是
△ABC的内角ABC的对边分别为abc若2bcosB=acosC+ccosA则B=.
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