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下列装置用于实验室制取CO2，不能随开随用、随关随停的装置是（ ）
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下图是制取气体的一种装置能用此装置制取气体并能随开随用随关随停的是
碱石灰与浓氨水制NH
3
铝片与烧碱溶液制H
2
电石与饱和食盐水制乙炔（C
2
H
2
）
亚硫酸钠固体与75%的硫酸制SO
2
1实验是化学研究的基础下列有关说法中正确的是_______填序号字母A.可在耐高温的石英坩埚中进行熔
在没有现成的CO2气体发生器的情况下请选用下图中部分仪器装配成一个简易能随开随用随关随停的CO2气体
下列H2的制备装置中不能起到随开随制随关随停效果的是
3.00分下列CO2的制备装置中不能起到随开随制随关随停效果的是
下面是实验室制取和收集气体的装置请按要求回答下列问题1仪器a的名称是2从装置A.~D中选择加热KMn
化学是一门以实验为基础的科学化学所取得的丰硕成果是与实验的重要作用分不开的结合下列实验装置图回答问题
将干燥管浸没烧杯或从烧杯中取出能达到随开随用随关随停下列气体的制取可使用该装置的是
用大理石粉末与稀盐酸反应制取二氧化碳
镁粉与稀硫酸反应制取氢气
用二氧化锰粉末与双氧水溶液制氧气
用块状大理石与稀盐酸反应制取二氧化碳
1实验室用大理石与酸制二氧化碳使用的酸是浓盐酸稀盐酸浓硫酸稀硫酸其化学方程式为2若设计一种由活塞可以
能用于实验室制取CO2并能随开随用随关随停的装置是
下列装置用于实验室制取CO2不能随开随用随关随停的装置是
下列装置用于实验室制取CO2不能随开随用随关随停的装置是
能用于实验室制取H2并能随开随用随关随停的装置是
下图是气体制取装置下列能用此装置制取气体并能随开随用随关随停的是
大理石和稀硫酸制取二氧化碳
锌粒和稀硫酸制取氢气
浓盐酸和二氧化锰制取氯气
电石和水制取乙炔
如图A.是实验室制取二氧化碳并检验其性质的实验装置图请你回答1a仪器的名称为2检查A.装置气密性的方
能用于实验室制取CO2并能随开随用随关随停的装置是
能用于实验室制取H2并能随开随用随关随停的装置是
1在没有现成的CO2气体发生器的情况下请你选用下图中的部分仪器装配成一个简易的能随开随用随关随停的C
下列有关实验原理或操作正确的是
配制0.1 mol·L
－1
烧碱溶液时，容量瓶应用0.1 mol·L
－1
烧碱溶液润洗
在蒸发溶液时，不能将溶液直接蒸干
实验室可用图 1 所示装置制备乙酸丁酯(已知反应温度为 115～125℃)
实验室用图2 所示装置制备氢气时，该装置符合“随开随 制，随关随停”的要求
1实验室用大理石与酸制二氧化碳使用的酸是浓盐酸稀盐酸浓硫酸稀硫酸其化学方程式为2若设计一种由活塞可以
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Haveyoueverrunintoacarelesscellphoneuseronthestreet?PerhapstheywerebusytalkingtextingorcheckingupdatesonWeChatwithoutlookingatwhatwasgoingonaroundthem.Asthenumberofthisnewspeciesofhumanhaskeptrising.Theyhavebeengivenanewname﹣phubbers低头族. RecentlyacartooncreatedbystudentsfromChinaCentralAcademyofFineArtsputthisgroupofpeopleunderthespotlight.Intheshortfilmphubberswithvarioussocialidentitiesburythemselvesintheirphones.Adoctorplayswithhiscellphonewhilelettinghispatientdieaprettywomantakesselfieinfrontofacaraccidentsiteandafatherloseshischildwithoutknowingaboutitwhileusinghismobilephone.Achainofsimilareventseventuallyleadstothedestructionoftheworld. Althoughtheendingsoundsoverstatedthedamagephubbingcanbringisreal. Yourhealthisthefirsttobeartheeffectandresultofit.ConstantlybendingyourheadtocheckyourcellphonecoulddamageyourneckGuangmingDailyquoteddoctorsassayingtheneckislikearopethatbreaksafterlongtermstretching.Alsostaringatcellphonesforlongperiodsoftimewilldamageyoureyesightgraduallyaccordingtothereport. Butthat'snotall.Beingaphubbercouldalsodamageyoursocialskillsanddriveyouawayfromyourfriendsandfamily.AtreunionswithfamilyorfriendsmanypeopletendtosticktotheircellphoneswhileothersarechattinghappilywitheachotherandthiscreatesastrangeatmosphereBeijingEveningNewsreported. Itcanalsocostyouyourlife.Therehavebeenlotsofreportsonphubberswhofelltotheirdeathsufferedaccidentsandwererobbedoftheircellphonesinbroaddaylight. 1ForwhatpurposedoestheauthorgivetheexampleofacartooninPara.3? A.Toadvertisethecartoonmadebystudents. B.Toinformpeopleofthebadeffectsofphubbing. C.Toindicatetheworldwillfinallybedestroyedbyphubbers. D.Towarndoctorsagainstusingcellphoneswhiletreatingpatients. 2WhichofthefollowingisNOTariskaphubbermayhave? A.Hissocialskillscouldbeaffected. B.Hisneckandeyesightwillbegraduallyharmed. C.Hemightgetseparatedfromhisfriendsandfamily. D.Hewillcausethedestructionoftheworld. 3Whichofthefollowingmaybetheauthor'sattitudetowardsphubbing? A.Supportive. B.Optimistic. C.Opposed. D.Objective. 4Whatmaythepassagetalkaboutnext? A.Measurestoreducetherisksofphubbing. B.Peopleaddictedtophubbing. C.Definitionofphubbers. D.Consequencesofphubbing.
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TakeActionforaBetterWorldVolunteersNeeded Sixmonths'preparationinDenmarkAfricastudiesteamworkcombinedwithsocialworkwithriskgroupteenagers. Sixmonths'communityworkinMalawiinPeopletoPeopleProjectsChildAidHIV/AIDSFigureand TeacherTraining. Qualifications18yearshardworkingandsocialengagement. Pleasecontactusbye﹣mailtakeaction@betterworld.Com. 1WhoissuitabletoworkasaCommunityRepresentativeinYOUTHInternational?. A.Onewhoenjoysworkingwithteenagersfromdifferentcountries. B.Onewhohopestotakeactioninfightingagainstdiseases. C.OnewhohasastrongdesiretoimprovehisorherEnglish. D.Onewhowantstoearnsomepocketmoneyintheprogram. 2WherewillJackavolunteerreceivethetrainingbeforeheissenttoworkinMalawi?. A.InsomelocalofficesintheU.S. B.InanESLorganizationinChina. C.InapreparationprograminDenmark. D.InanexchangestudentcenterinAfrica. 3IfMrs.BlackintheU.S.hopestolearnsomeChineseathomeshemaycontact. A.takeaction@betterworld.com B.ram3462@hotmall.com C.club3864@hotmail.com D.staff@youth.org 4WhatarevolunteersforanexperimentovertheInternetsupposedtodo?. A.Tointerviewpeopleonline. B.Todosomehousework. C.ToofferadviceonChildAid. D.Toprovidelanguageexercises.
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假设你是李华想通过希望工程为一名山村儿童提供一定的经济援助.请给相关部门写一封信请他们帮助选择一位合适人选candidate.信的内容应包括以下要点 1.帮助对象应符合的情况. 2.资助计划如何具体实施 注意1.词数不少于120 2.可适当增加细节以使行文连贯 3.开头已为你写好不计入总词数. Towhomitmayconcern I'mLiHuaastudentfromTieyiHighSchool.
CH4超干重整CO2技术可得到富含CO的化工原料．回答下列问题 1CH4超干重整CO2的催化转化如图1所示 ①已知相关反应的能量变化如图2所示 过程Ⅰ的热化学方程式为． ②关于上述过程Ⅱ的说法不正确的是填序号． a．实现了含碳物质与含氢物质的分离 b．可表示为CO2+H2＝H2Og+CO c．CO未参与反应 d．Fe3O4CaO为催化剂降低了反应的△H ③其他条件不变在不同催化剂ⅠⅡⅢ作用下反应CH4g+CO2g＝2COg+2H2g进行相同时间后CH4的转化率随反应温度的变化如图3所示．a点所代表的状态填“是”或“不是”平衡状态b点CH4的转化率高于c点原因是． 2在一刚性密闭容器中CH4和CO2的分压分别为20kPa25kPa加入Ni/α﹣A12O3催化剂并加热至1123K使其发生反应CH4g+CO2g═2COg+2H2g． ①研究表明CO的生成速率vCO＝1.3×10﹣2•pCH4•pCO2mol••g﹣1•s﹣1某时刻测得pCO＝20kPa则pCO2＝kPavCO＝mol••g﹣1•s﹣1 ②达到平衡后测得体系压强是起始时的1.8倍则该反应的平衡常数的计算式为Kp＝kPa2．用各物质的分压代替物质的量浓度计算 3CH4超干重整CO2得到的CO经偶联反应可制得草酸H2C2O4．常温下向某浓度的草酸溶液中加入一定浓度的NaOH溶液所得溶液中cH2C2O4＝cC2O42﹣则此时溶液的pH＝．已知常温下H2C2O4的Ka1＝6×10﹣2Ka2＝6×10﹣5lg6＝0.8
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.作文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 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. Doyoulovepotato'schipsandkebabs烤串?Doyouoftensitinthefrontofthecomputerwithoutmoveforhours?IfnotApril7theWorldHealthDayisagoodtimeforyoutothinkthesehabits. Thisyearthedaywillfocusindiabetes糖尿病.ThereareaincreasingnumberofteenagersgetthediseaseaccordingtotheWorldHealthOrganization.Diabetescandamagethehearteyeandkidneys肾.Obesity肥胖andlackofexerciseisbelievedtopayakeyrole.
There'sallthispressureinoursocietytobebeautifultobestrongtobesexy.Sowespendourtimeandmoneyontryingtobecomethesethings.Weputonthehighheels高跟鞋thesuitsthemake﹣upthemask.Thenwefeelmoreawkwardthanconfidentsowedrinkawayouranxieties.Thatdoesn'tmakeuslookanysexier.1 Everyoneisbeautiful.Everyoneissexy.Everyoneisstrong.It'sabsurdity.We'reallrunningaroundtryingtobecomesomethingthatwealreadyare. Youknowwhat'sreallysexy?2Apersonwhoacceptthemselvestotally.Andyouknowwhat'sreallyfunny?Itisjustastimeconsuminganddifficulttolearntoacceptyourselfasitistopretendtobesomeoneelse.Theonlydifferenceis﹣withselfacceptanceonedayit'snothardanymore.3 You'reeithergoingtospendthelittletimeyouhaveinyourlifeontryingtoknowyourselfortryingtohideyourself.4Youcan'tdoboth. Iknowyou'vedreamtaboutchangingtheworld.Sothisisyourchance.Learntoloveyourselfacceptyourself5It'sinthere.Youjusthavetobelieveit. A.Itjustmakesusstopcaringabouthowwelook. B.Thechoiceisyours. C.Apersonwho's100%comfortablewiththemselves. D.Unleash释放yourstrongestsexiestself. E.Beautifulisn'tsomethingyoubecome. F.Onedayyoufeellikeyoursexieststrongestselfjustrollingoutofbedinthemorning. G.Beingacceptedbyothersisn'tthebestwaytosucceed.
某种汽车的购车费用是10万元每年使用的保险费养路费汽油费约为0.9万元年维修费用第一年是0.2万元第二年是0.4万元第三年是0.6万元…以后逐年递增0.2万元．汽车的购车费用每年使用的保险费养路费汽油费维修费用的和平均摊到每一年的费用叫做年平均费用．设这种汽车使用xx∈N*年的维修费用为gx年平均费用为fx． 1求出函数gxfx的解析式 2这种汽车使用多少年时它的年平均费用最小最小值是多少
Everybodysleepsbutwhatpeoplestayuplatetocatch﹣orwakeupearlyinordernottomiss﹣variesbyculture.Fromdatacollecteditseemsthethingsthatcauseustolosethemostsleeponaveragearesportingeventstimechangesandholidays. Aroundtheworldpeoplechangedsleeppatternsthankstothestartorendofdaylightsavingstime.Russiansforexamplebegantowakeupaboutahalf﹣hourlatereachdayafterPresidentVladimirPutinshiftedthecountrypermanentlytowintertimestartingonOctober36. Russia'sotherlatenightsandearlymorningsgenerallycorrespondtopublicholidays.OnNewYear'sEveRussianshavetheworld'slatestbedtimehittingthehayataround330am. RussiansalsogetupanhourlateronInternationalWomen'sDaythedayfortreatingandcelebratingfemalerelatives. SimilarlyAmericans'latenightslatemorningsandlongestsleepsfallonthree﹣dayweekends. CanadagottheleastsleepoftheyearthenightitbeatSwedenintheOlympichockey冰球final. TheWorldCupisalsochieflyresponsibleforsleepdeprivation剥夺TheworstnightforsleepintheU.K.wasthenightoftheEngland﹣ItalymatchonJune15.Britsstayedupahalf﹣hourlatertowatchitandthentheywokeupearlierthanusualthenextmorningthankstosummernightsthephenomenoninwhichthesunbarelysetsinnortherncountriesinthesummertime.ThatwasnothingthoughcomparedtoGermansItaliansandtheFrenchwhostayeduparoundanhourandahalflateronvariousdaysthroughoutthesummertowatchtheCup. Itshouldbemadeclearthatnoteveryonehasadevicetorecordtheirsleeppatternsinsomeofthesenationsit'slikelythatonlytherichestpeopledo.Andpeoplewhoelecttotracktheirsleepmaytrytogetmoresleepthantheaverageperson.Evenifthat'sthecasethoughtheabovefindingsarestillstrikingIfthemosthealth﹣consciousamongushavesuchdeepswingsinourshut﹣eyelevelsthroughouttheyearhowmuchsleeparetherestofuslosing? 1Whatdoestheauthorsayaboutpeople'ssleepinghabits? A.Theyareculture﹣related. B.Theyaffectpeople'shealth C.Theychangewiththeseasons. D.Theyvaryfrompersontoperson. 2WhatdowelearnabouttheRussiansregardingsleep? A.Theydon'tsleepmuchonweekends. B.Theygetlesssleeponpublicholidays C.Theydon'tfallasleepuntilverylate. D.Theysleeplongerthanpeopleelsewhere. 3Whatisthemostprobablereasonforsomerichpeopletouseadevicetorecordtheirpatterns? A.Theyareinvolvedinasleepresearch. B.Theyhavetroublefallingasleep. C.Theywanttogetsufficientsleep. D.Theywanttogotobedonregularhours. 4Whatdoestheauthorimplyinthelastparagraph? A.Sleeplessnessdoesharmtopeople'shealth. B.Fewpeoplereallyknowtheimportanceofsleep. C.Itisimportanttostudyoursleeppatterns. D.Averagepeopleprobablysleeplessthantherich.
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日华子本草中已有关于雄黄的记载“雄黄通赤亮者为上验之可以虫死者为真．”雄黄As4S4和雌黄As2S3是提取砷的主要矿物原料二者在自然界中共生．回答下列问题 1基态砷原子的价电子轨道排布图为核外电子占据的最高能级的电子云轮廓图形状为． 2SP和N三种元素第一电离能由大到小的顺序是． 3雄黄As4S4的结构如图1所示S原子的杂化形式为． 4SO2分子中的σ键数为个分子的空间构型为．分子中的大π键可用符号πmn表示其中m代表参与形成大π键的原子数n代表参与形成大π键的电子数如苯分子中的大π键可表示为π66则SO2中的大π键应表示为．SO2分子中S﹣O键的键角NO3﹣中N﹣O键的键角填“＞”“＜”“＝”． 5砷化镓是优良的半导体材料密度为ρg•cm﹣3其晶胞结构如图2所示．Ga和As原子半径分别为r1pm和r2pm阿伏加德罗常数值为NA则砷化镓晶体的空间利用率为．
用下列实验装置部分夹持装置略去进行相应的实验能达到实验目的是
OpenLettertoanEditor Ihadaninterestingconversationwithareporterrecently﹣onewhoworksforyou.Infacthe'soneofyourbestreporters.Hewantstoleave. Yourreportergavemeacopyofhisresumeandphotocopiesofsixstoriesthathewroteforyou.Theheadlinesshowedyouplayedthemproudly.Withgreatenthusiasmhetalkedabouthowhefindsissuesapproachesthemandwritesaboutthemwhichtellsmeheisoneofyourbest.I'msureyouwouldhatetolosehim.Surprisinglyyourreporterisnotunhappy.Infacthetoldmehereallylikeshisjob.Hehasagreatassignmentandsaidyourunagreatpaper.Itwouldbeeasyforyoutokeephimhesaid.Heknowsthatthepapervalueshim.Heappreciatestheresponsibilityyou'vegivenhimtakesownershipofhisprofessionandenjoyshisfreedom. Sowhyishelookingforawayout? Hetalkedtomebecausehewantshiseditorstodemandsomuchmoreofhim.Hewantstobepushed challengedcoachedtonewheights. Thereporterbelievesthatgoodstoriesspringfromgoodquestionsbuthiseditorsusuallyaskhowlongthestorywillbewhenitwillbeinwhereitcanplayandwhatthebudgetis. Helongsforconversationswithaneditorwhowillhelphimturnhisgoodideasintogreatones.Hewantssomeonetogetexcitedaboutwhathe'sdoingandtohelphimturnhisstoryideaupsidedownandinsideoutexploringthebestwaystoreportit.Hewantstobemorevaluableforyourpaper.That'swhatyouwantforhimtooisn'tit? Soyourreporterhassetmethinking. Ourbesthopeinkeepingourbestreporterscopyeditorsphotographersartists﹣everyone﹣istowork hardertomakesuretheygetthehelptheyaredemandingtoreachtheirpotential.Ifwecan'tdoitthey'llfindsomeonewhocan. 1Whatdoesthewriterthinkofthereporter?. A.Optimistic. B.Imaginative. C.Ambitious. D.Proud. 2Whoprobablywrotetheletter?. A.Aneditor. B.Anartist. C.Areporter. D.Areader. 3Theletteraimstoremindeditorsthattheyshould. A.keeptheirbestreportersatallcosts B.givemorefreedomtotheirreporters C.beawareoftheirreporters'professionaldevelopment D.appreciatetheirreporters'workingstylesandattitudes
化学与生产生活密切相关．下列说法错误的是
向量＝sinxcosx＝sin﹣xcosx函数fx＝． 1求fx的最小正周期及单调増区间 2求fx在区间[0]上的最大值和最小值及取最值时x的值．
BagsofLove LastyearIwasassignedtoworkatanofficenearmymother'shousesoIstayedwithherforamonth.DuringthattimeIhelpedoutwiththehouseworkandcontributedtothegroceries. AfterlessthanaweekIstartednoticingthatthegrocerieswererunningoutprettyquickly﹣wewerealwayssuddenlyoutofsomething.1wonderhowmymumcouldconsumethemsoquicklyIbeganobservingherdailyroutinefortwoweeks.TomysurpriseIfoundthatshewouldpackapaperbagfullofcannedgoodsandheadouteverymorningataboutnine.EventuallyIdecidedtofollowherand2happenedtrulyamazedme.Shewastakingthefoodtotherefugeecampin3shedistributedittochildren. Iaskedaroundandfoundoutthatmymumwasverywellknowninthearea.Thekidswereveryfriendlywithherandevenlookeduptoherasifshe4theirownmother.Thenit5hitme﹣shywouldshemotwanttotellmeaboutwhatshe6do?WassheworriedabouthowIwouldreactorthatIwouldstop7buythegroceriesifIfoundout? WhenshegothomeItoldheraboutmydiscovery.8shecouldreactIgaveherabighugandtoldhershedidn'tneedtokeepitasecret9me.Shetoldmethatsomeofthechildrenlivedwithanolderladyinashelterwhileotherssleptonthestreets.Foryearsmymumhasbeenhelpingoutbygivingthemwhateverfoodshecouldspare.Iwassoimpressedby10selflessshewas.
Ifyouwanttolearnanewlanguagetheveryfirstthingtothinkaboutiswhy.Doyouneeditfora1reasonsuchasyourjoboryourstudies?2perhapsyouareinterestedinthe3filmsorthemusicofadifferentcountryandyouknowhowmuchitwillhelptohavea4ofthelanguage. Mostpeoplelearnbestusingavarietyof5buttraditionalclassesareanidealstartformanypeople.They6anenvironmentwhereyoucanpracticeunderthe7ofsomeonewho'sgoodatthelanguage.Wealllead8livesandlearninglanguagetakes9.Youwillhavemoresuccessifyoustudyregularlysotrytodevelopa10.Itdoesn'tmatterifyouhaven'tgotlong.Becoming11inalanguagewilltakeyearsbutlearningtogetbytakesalotless. Manypeoplestartlearningalanguageandsoongivenup.I'mtoo12theysay.Yeschildrendolearnlanguagesmore13thanadultsbutresearchhasshownthatyoucanlearnalanguageatany14.Andlearningisgoodforthehealthofyourbraintoo.I'vealsoheardpeople15aboutthemistakestheymakewhen16.Wellrelaxandlaughaboutyour17andyou'remuchlesslikelytomakethemagain. Learninganewlanguageisnever18.Butwithsomeworkanddevotionyou'llmakeprogress.Andyou'llbe19bythepositivereactionofsomepeoplewhenyousayjustafewwordsin20wonlanguage.Goodluck! 1A.technical Bpolitical C.practical D.physical 2A.After B.So C.Though D.Or 3A.literature B.transport C.agriculture D.medicine 4A.view B.knowledge C.form D.database 5A.paintings B.regulations C.methods D.computers 6A.protect B.change C.respect D.provide 7A.control B.command C.guidance D.pressure 8A.busy B.happy C.simple D.normal 9A.courage B.time C.energy D.place 10A.theory B.business C.routine D.project 11A.bored B.fluent C.interested D.devoted 12A.old B.nervous C.weak D.tired 13A.closely B.quickly C.privately D.quietly 14A.age B.speed C.distance D.school 15A.worry B.hesitate C.think D.quarrel 16A.singing B.working C.bargaining D.learning 17A.progress B.mistakes C.cleverness D.clumsiness 18A.tiresome B.hard C.interesting D.easy 19A.blamed B.amazed C.interrupted D.informed 20A.their B.his C.our D.your
常温时向20mL0.1mol•L﹣1的CH3CH2COOH溶液中滴加0.1mol•L﹣1的NaOH溶液溶液的pH与滴加NaOH溶液体积V的关系如图所示．下列说法正确的是
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有机化合物甲与乙在一定条件下可反应生成丙下列说法正确的是
Pleaseacceptthisgiftin感激ofallyou'vedoneforus.
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