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为验证卤素单质氧化性的相对强弱，某小组用下图所示装置进行实验(夹持仪器已略去，气密性已检验)。 实验过程： Ⅰ．打开弹簧夹，打开活塞a，滴加浓盐酸。 Ⅱ．当B和C中的溶液...
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为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行实验夹持仪器已略去气密性已检验 实验过程 Ⅰ
为验证卤素单质氧化性的相对强弱某小组用如图所示装置进行实验夹持仪器已略去气密性已检验实验过程①打开弹
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行实验夹持仪器已略去气密性已检验实验过程Ⅰ.打开
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行实验夹持仪器已略去气密性已检验实验过程Ⅰ.打开
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行试验夹持仪器已略去气密性已检验试验过程Ⅰ.打开
某化学小组用下图所示装置验证卤素单质氧化性的相对强弱下列说法不正确的是
E.处棉花球变成黄色，说明
的氧化性比
强
F.处棉花球变成蓝色，说明
的氧化性比
强
E.处发生反应的离子方程式为：
G.装置中
溶液与
反应的离子方程式为：
某化学小组用下图所示装置验证卤素单质氧化性的相对强弱下列说法不正确的是
E.处棉花球变成黄色，说明Cl
2
的氧化性比Br
2
强
F.处棉花球变成蓝色，说明Br
2
的氧化性比I
2
强
E.处发生反应的离子方程式为：Cl
2
+ 2Br
-
= 2Cl
-
+ Br
2
G.装置中NaOH溶液与Cl
2
反应的离子方程式为： Cl
2
+ 2OH
-
= ClO
-
+ Cl
-
+ H
2
O
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行实验夹持仪器已略去气密性已检验
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行实验夹持仪器已略去气密性已检验
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行实验夹持仪器已略去气密性已检验
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行实验夹持仪器已略去气密性已检验
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行实验夹持仪器已略去气密性已检验实验过程I.打开
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行试验夹持仪器已略去气密性已检验试验过程Ⅰ.打开
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行试验夹持仪器已略去气密性已检验试验过程Ⅰ.打开
为验证卤素单质氧化性的相对强弱某小组用下图所示装置进行实验夹持仪器已略去气密性已检验
某化学小组用如图所示装置验证卤素单质氧化性的相对强弱.下列说法不正确的是
E.处棉花球变成橙黄色，说明Cl
2
的氧化性 比Br
2
强
F.处棉花球变成蓝色，说明Br
2
的氧化性 比I
2
强
E.处发生反应的离子方程式为：Cl
2
+ 2Br
-
= 2Cl
-
+ Br
2
G.装置中NaOH溶液与Cl
2
反应的离子方程式为：Cl
2
+2OH
-
=ClO
-
+Cl
-
+H
2
O
为验证卤素单质氧化性的相对较弱某小组用下图装置进行实验夹持仪器已略去气密性已检验实验过程Ⅰ.打开弹簧
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Howshouldoneinvestasumofmoneyinthesedaysofinflation通货膨胀Leftinabankitwillhardlykeepitsvaluehoweverhightheinterestrateis.OnlyabravemanoraveryrichonedarestobuyandsellontheStockMarket.Todayitseemsthatoneofthebestwaystoprotectyoursavingsandevenincreaseyourwealthistobuybeautifulobjectsfromthepast.HereIamgoingtooffersomeadviceoncollectingantiqueclockswhichIpersonallyconsiderareamongthemostinterestingofantiques.Isometimeswonderwhatabeingfromanotherplanetmightreportbackaboutourwayoflife.TheplanetEarthisruledbyamysteriouscreaturethatsitsorstandsinaroomandmakesastrangetickingsound.Ithasafacewithtwelveblackmarksandtwohands.Mencandonothingwithoutitspermissionanditfastensitsyoungroundpeople’swristssothateverywheremengotheyarestillunderitscontrol.ThiscreatureistherealmasterofEarthandmenareitsslaves.Whetherornotweareslavesoftimetodaydependsonourcultureandpersonalitybutitisbelievedthatmanyyearsagokingskeptspecialslavestotellthetime.Certainmenwereverycleveratmeasuringthetimeofdayaccordingtothebeatingoftheirownhearts.Theyweremadetostandinafixedplaceandeveryhourorsowouldshoutthetime.Soitseemsthatthefirstclockswerehumanbeings.Howevermenquicklyfoundmoreconvenientandreliablewaysoftellingthetime.Theylearnedtousetheshadowscastbythesun.Theymarkedthehoursoncandlesusedsandinhourglassesandinventedwater-clocks.Indeedanyseriousstudentofantiquesshouldspendasmuchtimeaspossiblevisitingpalacesstatelyhomesandmuseumstoseesomeofthefinestexamplesofclocksfromthepast.Antiqueclockscouldbeveryexpensivebutoneofthejoysofcollectingclocksisthatitisstillpossibletofindquitecheaponesforyourownhome.AfterallifyouaregoingtoberuledbythetimewhynotinvestinairantiqueclockandperhapsmakeafutureprofitThepurposeofthepassageis______.
IamSergeyBrin!IwasborninMoscow.In1979whenIwas5myfamilyimmigratedtotheU.S.A.California.Irememberthatonmy9thbirthdayIgotmyfirstcomputerCommodore64.LaterIgraduatedwithhonorsintheUniversityofMarylandinMathematicsandIT.Themainfieldofmyscienceresearchwasthetechnologiesusedtocollectdatafromunsystematicsourcesaswellaslargequantitiesoftextsandsciencedata.IwastheauthorofdozensofarticlesinleadingAmericanacademicmagazines.Thegreatesteventinmylifehappenedwhenin1998Iwaspreparingforthedefense论文答辩ofmyDoctor’sdegreeinStanfordUniversity.TherethefatemadememeetLarryPage—ayoungcomputergenius.Larrybelongedtotheintellectual知识分子society.LarryandIquicklybecamefriendswhenweworkedtogether.WeweresearchingdayandnightontheInternet.Wewerefindingalotofinformationbutwiththefeelingwestillcouldn’tfindenoughofwhatwewerelookingfor.Naturallytheideaforasearchenginethatwouldallowspecificinformationtobefoundintheendlesspoolofdatawasbornlikeitcametous.Itwasn’tourplansbutwegaveuptheeducationattheuniversity.Youknowthenextpartmaybe—wemanagedtoturnanordinarygarageinMeploParkCaliforniatheU.S.A.intoourfirstofficeinwhichGooglewasborn.WithexcitementwetypedthenameofthethingwhichwecreatedwithloveonSeptember14th1998—www.Google.com.Nowafterthoseyearsweboughtthisgarage.Asasymbolitwillalwaysremindusthateverythingispossible.WhydidtheyfoundGoogle
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IamSergeyBrin!IwasborninMoscow.In1979whenIwas5myfamilyimmigratedtotheU.S.A.California.Irememberthatonmy9thbirthdayIgotmyfirstcomputerCommodore64.LaterIgraduatedwithhonorsintheUniversityofMarylandinMathematicsandIT.Themainfieldofmyscienceresearchwasthetechnologiesusedtocollectdatafromunsystematicsourcesaswellaslargequantitiesoftextsandsciencedata.IwastheauthorofdozensofarticlesinleadingAmericanacademicmagazines.Thegreatesteventinmylifehappenedwhenin1998Iwaspreparingforthedefense论文答辩ofmyDoctor’sdegreeinStanfordUniversity.TherethefatemadememeetLarryPage—ayoungcomputergenius.Larrybelongedtotheintellectual知识分子society.LarryandIquicklybecamefriendswhenweworkedtogether.WeweresearchingdayandnightontheInternet.Wewerefindingalotofinformationbutwiththefeelingwestillcouldn’tfindenoughofwhatwewerelookingfor.Naturallytheideaforasearchenginethatwouldallowspecificinformationtobefoundintheendlesspoolofdatawasbornlikeitcametous.Itwasn’tourplansbutwegaveuptheeducationattheuniversity.Youknowthenextpartmaybe—wemanagedtoturnanordinarygarageinMeploParkCaliforniatheU.S.A.intoourfirstofficeinwhichGooglewasborn.WithexcitementwetypedthenameofthethingwhichwecreatedwithloveonSeptember14th1998—www.Google.com.Nowafterthoseyearsweboughtthisgarage.Asasymbolitwillalwaysremindusthateverythingispossible.SergeyBrinactuallygraduatedfrom______.
短周期元素形成的常见非金属固体单质A与常见金属单质B在加热条件下反应生成化合物CC与水反应生成白色沉淀D和气体ED既能溶于强酸也能溶于强碱E在足量空气中燃烧产生刺激性气体GG在大气中能导致酸雨的形成E被足量氢氧化钠溶液吸收得到无色溶液F溶液F在空气中长期放置发生反应生成物之一为HH与过氧化钠的结构和化学性质相似其溶液显黄色 请回答下列问题 G与氯酸钠在酸性条件下反应可生成消毒杀菌剂二氧化氯该反应的氧化产物为当生成2mol二氧化氯时转移电子mol
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Amiddle-agedmanwithalongbeardwasarrestedbythepolicefordisorderlyconductandpropertydamage.Morechargesmightheaddedlatersaidapoliceofficer.ThemanidentifiedasBillWildcheckedintotheMotelFivelastnightaboutanhouraftersunset.Tellingtheclerkthathewouldbestayingfournightshepaidcashinadvance.ShesaidthatthenearestgrocerystorewasJohn-Johnswhichwasonlytwoblocksaway.ThepolicesaidthatWildwenttoJohn-Johnsandpurchasedthreegallonsofhoneyandfourgallonsofchocolatesyrup糖浆.Thecheckeraskedhimwhattheoccasionwas.HerepliedI’mtryingtobecomeasweeterperson.Thecheckersmiledatthejoke.Wilddrovebacktothemotel.Heopenedallsevencontainersandpouredthemintothebathtub.Headdedwarmwatertothemix.Thenheplacedhisboomboxonthebathroomfloornexttothetub.Hetunedtheradiotoanoperastation.Hegotundressedhoppedintothetubandstartedsingingloudlywiththemusic.Fifteenminuteslaterthelodgersintheroomnextdoorphonedtheclerk.ShebangedonWild’sdoorbuthekeptsinging.Shephonedhisroombuthedidn’tanswer.Thenshecalledthepolicewhoarrivedquickly.Wellatleasthepaidinadvancesaidtheclerk.Thatmoneywillhelppayfortheplumber管子工.Thebathtubdrainwascompletelyclogged阻塞.Thetubremainedfullofchocolateandhoney.Youjustneverknowaboutpeoplesaidtheclerk.Heseemedsoniceandfriendly.Who’dhavethoughthewasabathtub-singingnutThepolicesaidthiswasthethirdtimethatWildhadbeenarrestedforthiskindofbehavior.WhichsentenceinthepassagecanbereplacedbythefollowingoneHelookssokindandamicablethatwehadneverthoughthewasamadmanwholikestosinginbathtub.
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Amiddle-agedmanwithalongbeardwasarrestedbythepolicefordisorderlyconductandpropertydamage.Morechargesmightheaddedlatersaidapoliceofficer.ThemanidentifiedasBillWildcheckedintotheMotelFivelastnightaboutanhouraftersunset.Tellingtheclerkthathewouldbestayingfournightshepaidcashinadvance.ShesaidthatthenearestgrocerystorewasJohn-Johnswhichwasonlytwoblocksaway.ThepolicesaidthatWildwenttoJohn-Johnsandpurchasedthreegallonsofhoneyandfourgallonsofchocolatesyrup糖浆.Thecheckeraskedhimwhattheoccasionwas.HerepliedI’mtryingtobecomeasweeterperson.Thecheckersmiledatthejoke.Wilddrovebacktothemotel.Heopenedallsevencontainersandpouredthemintothebathtub.Headdedwarmwatertothemix.Thenheplacedhisboomboxonthebathroomfloornexttothetub.Hetunedtheradiotoanoperastation.Hegotundressedhoppedintothetubandstartedsingingloudlywiththemusic.Fifteenminuteslaterthelodgersintheroomnextdoorphonedtheclerk.ShebangedonWild’sdoorbuthekeptsinging.Shephonedhisroombuthedidn’tanswer.Thenshecalledthepolicewhoarrivedquickly.Wellatleasthepaidinadvancesaidtheclerk.Thatmoneywillhelppayfortheplumber管子工.Thebathtubdrainwascompletelyclogged阻塞.Thetubremainedfullofchocolateandhoney.Youjustneverknowaboutpeoplesaidtheclerk.Heseemedsoniceandfriendly.Who’dhavethoughthewasabathtub-singingnutThepolicesaidthiswasthethirdtimethatWildhadbeenarrestedforthiskindofbehavior.WhatdoyouthinkofBillWildWhyPleaseanswerwithin30words
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奥苏贝尔认为学校情境中的成就动机主要由三方面的内驱力组成体现的是以求知作为目标从知识的获得中得到满足是学习的内部动机
Howshouldoneinvestasumofmoneyinthesedaysofinflation通货膨胀Leftinabankitwillhardlykeepitsvaluehoweverhightheinterestrateis.OnlyabravemanoraveryrichonedarestobuyandsellontheStockMarket.Todayitseemsthatoneofthebestwaystoprotectyoursavingsandevenincreaseyourwealthistobuybeautifulobjectsfromthepast.HereIamgoingtooffersomeadviceoncollectingantiqueclockswhichIpersonallyconsiderareamongthemostinterestingofantiques.Isometimeswonderwhatabeingfromanotherplanetmightreportbackaboutourwayoflife.TheplanetEarthisruledbyamysteriouscreaturethatsitsorstandsinaroomandmakesastrangetickingsound.Ithasafacewithtwelveblackmarksandtwohands.Mencandonothingwithoutitspermissionanditfastensitsyoungroundpeople’swristssothateverywheremengotheyarestillunderitscontrol.ThiscreatureistherealmasterofEarthandmenareitsslaves.Whetherornotweareslavesoftimetodaydependsonourcultureandpersonalitybutitisbelievedthatmanyyearsagokingskeptspecialslavestotellthetime.Certainmenwereverycleveratmeasuringthetimeofdayaccordingtothebeatingoftheirownhearts.Theyweremadetostandinafixedplaceandeveryhourorsowouldshoutthetime.Soitseemsthatthefirstclockswerehumanbeings.Howevermenquicklyfoundmoreconvenientandreliablewaysoftellingthetime.Theylearnedtousetheshadowscastbythesun.Theymarkedthehoursoncandlesusedsandinhourglassesandinventedwater-clocks.Indeedanyseriousstudentofantiquesshouldspendasmuchtimeaspossiblevisitingpalacesstatelyhomesandmuseumstoseesomeofthefinestexamplesofclocksfromthepast.Antiqueclockscouldbeveryexpensivebutoneofthejoysofcollectingclocksisthatitisstillpossibletofindquitecheaponesforyourownhome.AfterallifyouaregoingtoberuledbythetimewhynotinvestinairantiqueclockandperhapsmakeafutureprofitWhichofthefollowingisNOTmentionedasawaytomeasurethetime
久置空气中会发生颜色变化但颜色变化不是由于跟氧气反应引起的物质是
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从广义教育角度看教育者包括一切对他人施加的人从学校教育角度看教育者主要指
如下图所示烧杯甲中盛放100mL6mol·L-1的盐酸烧杯乙中盛放100mL冷水现向烧杯甲的溶液中放入25gNaOH固体同时向烧杯乙中放入NH4NO3固体搅拌使之溶解 1A瓶中气体的颜色简述理由 2B瓶中气体的颜色简述理由
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemsthatfouroutoffiveyoungpeoplenowgetonwiththeirparentswhichistheoppositeofthepopularly-heldimage形象ofunhappyteenagerslockedintheirroomafterendlessfamilyquarrels.Animportantnewstudyintoteenageattitudessurprisinglyshowsthattheirfamilylifeismoreharmoniousthanithaseverbeeninthepast.Weweresurprisedbyjusthowpositivetoday’syoungpeopleseemtobeabouttheirfamiliessaidonememberoftheresearchteamThey’reexpectedtoberebellious叛逆的andselfishbutactuallytheyhaveotherthingsontheirminds:theywantacarandmaterialgoodsandtheyworryaboutwhetherschoolisservingthemwell.There’smorenegotiation商议anddiscussionbetweenparentsandchildrenandchildrenexpecttotakepartinthefamilydecision-makingprocess.Theydon’twanttorocktheboat.Soitseemsthatthisgenerationofparentsismuchmorelikelythanparentsof30yearsagototreattheirchildrenasfriends.Myparentsarehappytodiscussthingswithmeandwillingtolistentomesays17-year-oldDanielLazallIalwaystellthemwhenI’mgoingoutclubbing.AslongastheyknowwhatI’mdoingthey’refinewithit.SusanCromewhoisnow21agrees.Lookingbackonthelast10yearstherewasalotofwhatyoucouldcallnegotiation.ForexampleaslongasI’ddoneallmyhomeworkIcouldgooutonaSaturdaynight.ButIthinkmygrandparentswerealotstricterwithmyparentsthanthat.Maybethispositiveviewoffamilylifeshouldnotbeunexpected.Itispossiblethattheideaofteenagerebellionisnotrootedinrealfacts.AresearchercommentsOursurprisethatteenagerssaytheygetalongwellwiththeirparentscomesbecauseofabriefperiodinoursocialhistorywhenteenagerswereregardedasdifferentbeings.Butthatideaofrebellingandbreakingawayfromtheirparentsreallyonlyhappenedduringthatonetimeinthe1960swheneveryonerebelled.Thenormalsituationthroughouthistoryhasbeenasmoothchangefromhelpingoutwiththefamilybusinesstotakingitover./Comparedwithparentsof30yearsagotoday’sparents______.
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在密闭容器中进行的如下反应 SO2的起始浓度是0.4mol·L-1O2的起始浓度是1mol·L-1当SO2的转化率为80%时反应达到平衡状态 求反应的平衡常数
教育的技巧并不在于能预见到课堂的所有细节而是在于根据当时的具体情况捕捉一些有价值的细节巧妙地在学生不知不觉之中作出相应的调整和变动——苏霍姆林斯基分析教学细节的重要意义
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemsthatfouroutoffiveyoungpeoplenowgetonwiththeirparentswhichistheoppositeofthepopularly-heldimage形象ofunhappyteenagerslockedintheirroomafterendlessfamilyquarrels.Animportantnewstudyintoteenageattitudessurprisinglyshowsthattheirfamilylifeismoreharmoniousthanithaseverbeeninthepast.Weweresurprisedbyjusthowpositivetoday’syoungpeopleseemtobeabouttheirfamiliessaidonememberoftheresearchteamThey’reexpectedtoberebellious叛逆的andselfishbutactuallytheyhaveotherthingsontheirminds:theywantacarandmaterialgoodsandtheyworryaboutwhetherschoolisservingthemwell.There’smorenegotiation商议anddiscussionbetweenparentsandchildrenandchildrenexpecttotakepartinthefamilydecision-makingprocess.Theydon’twanttorocktheboat.Soitseemsthatthisgenerationofparentsismuchmorelikelythanparentsof30yearsagototreattheirchildrenasfriends.Myparentsarehappytodiscussthingswithmeandwillingtolistentomesays17-year-oldDanielLazallIalwaystellthemwhenI’mgoingoutclubbing.AslongastheyknowwhatI’mdoingthey’refinewithit.SusanCromewhoisnow21agrees.Lookingbackonthelast10yearstherewasalotofwhatyoucouldcallnegotiation.ForexampleaslongasI’ddoneallmyhomeworkIcouldgooutonaSaturdaynight.ButIthinkmygrandparentswerealotstricterwithmyparentsthanthat.Maybethispositiveviewoffamilylifeshouldnotbeunexpected.Itispossiblethattheideaofteenagerebellionisnotrootedinrealfacts.AresearchercommentsOursurprisethatteenagerssaytheygetalongwellwiththeirparentscomesbecauseofabriefperiodinoursocialhistorywhenteenagerswereregardedasdifferentbeings.Butthatideaofrebellingandbreakingawayfromtheirparentsreallyonlyhappenedduringthatonetimeinthe1960swheneveryonerebelled.Thenormalsituationthroughouthistoryhasbeenasmoothchangefromhelpingoutwiththefamilybusinesstotakingitover./Whatisthepassagemainlyabout
短周期元素形成的常见非金属固体单质A与常见金属单质B在加热条件下反应生成化合物CC与水反应生成白色沉淀D和气体ED既能溶于强酸也能溶于强碱E在足量空气中燃烧产生刺激性气体GG在大气中能导致酸雨的形成E被足量氢氧化钠溶液吸收得到无色溶液F溶液F在空气中长期放置发生反应生成物之一为HH与过氧化钠的结构和化学性质相似其溶液显黄色 请回答下列问题 组成单质A的元素位于周期表中第周期第族
烃是有机化学中一类重要的有机物烯烃中C=C键由一个σ键和一个π键组成其中σ键组成物质的基本骨架它能旋转而π键比σ键弱不能旋转 二烯烃与单烯烃或炔烃类物质可发生14-成环加成反应生成六元环状化合物如 将太阳能有效地转化为其他形式的能量是解决化石燃料耗尽后世界能源问题的关键 有人提出以降冰片二烯BCD为介质将太阳能转化为其他形式的能量的方法是首先让BCD吸收太阳光BCD转化为其同分异构体四环烷QC然后QC在催化剂的作用下重新转化为BCD并放出能量生成的BCD可循环使用BCD可由一分子环戊二烯和一分子乙炔经二聚反应制得BCD吸收光能发生光化学反应生成QC的过程中未发生σ键的断裂 根据以上信息请回答下列问题 比较BCD和QC能量的相对高低BCDQC填＞＜或=
鸡没有汗腺夏天只能依赖“喘息”调节体温鸡过度呼出CO2会使下列平衡向左移动导致蛋壳变薄即下“软壳蛋”使养鸡专业户蒙受经济损失 澳大利亚学者研究发现夏季给鸡喂食下列某种饮料会使蛋壳变厚这种饮料是
AB两种烃组成的混合物当它们的总质量一定时无论AB以何种比例混合完全燃烧生成的CO2的质量都相等符合这一条件的组合有①同分异构体②同系物③具有相同的最简式④含碳的质量分数相等其中正确的是
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的氧化性比
强 F.处棉花球变成蓝色，说明的氧化性比
强 E.处发生反应的离子方程式为：
G.装置中
溶液与反应的离子方程式为：
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