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在标准状况下，将224.L HCl气体溶于635mL(ρ=1.00g·cm-3)的水中，所得盐酸的密度为1.20g·cm-3。试求： 标准状况下，取这种盐酸100mL与足量的NaHCO3溶液反...
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在标准状况下将224L.氯化氢气体溶于635mL的水密度为1g/cm3中所得盐酸的密度为1.18g/
.0.03molCu投入到一定量的浓HNO3中Cu完全溶解生成气体颜色越来越浅共收集到标准状况下67
504mL
336mL
224mL
168mL
【I.】在标准状况下将224LHCl气体溶于635mLρ＝1.00g·cm-3的水中所得盐酸的密度为
0.64gCu投入到一定量的浓HNO3中Cu完全溶解生成气体颜色越来越浅共收集到标准状况下224mL
168mL
224mL
112mL
56mL
将标准状况下的VLHCl气体溶于100ml水得到密度为ρg/cm3的盐酸溶液则该盐酸溶液的物质的量浓
1.92gCu投入一定量的浓HNO3溶液中Cu完全溶解生成气体颜色越来越浅共收集到标准状况下的气体6
504mL
336mL
224mL
168mL
请按要求完成下列填空1质量之比为16∶7∶6的SO2CONO分子个数之比为21.204×1024个D
在标准状况下将224L.氯化氢气体溶于635mL的水密度为1g/cm3中所得盐酸的密度为1.18g/
1在标准状况下将224LHCl气体溶于635ml水ρ=1.00g/mL中所得盐酸溶液密度为1.18g
将标准状况下2240mLHCl气体溶于10mL水中得到密度为ag/mL的盐酸则该盐酸溶液中HCl的物
10.0 mol/L
10.0a mol/L
7.3 mol/L
7.3a mol/L
①20gNaOH溶于水形成500mL溶液所得溶液的物质的量浓度是____________mol/L②
将1.92g铜投入一定量的浓HNO3中铜完全溶解生成的气体颜色越来越浅共收集到标准状况下672mL气
504mL
336mL
168mL
224mL
标准状况下将224L的HCl气体溶于815mL水中ρ=1.00g/cm3所得盐酸的密度是1.18g/
在标准状况下将224LHCl气体溶于635mL水中所得盐酸的密度为1.18g/cm3试计算1所得盐酸
在标准状况下将224L氯化氢气体溶于635mL的水密度为1.00g/cm3中所得盐酸的密度为1.18
某同学将标准状况下44.8L的HCl气体溶于水配成500mL的溶液该HCl气体的物质的量为可知所配成
在标准状况下将224.LHCl气体溶于635mLρ=1.00g·cm-3的水中所得盐酸的密度为1.2
在标准状况下将224L.HCl气体溶于635mL水中ρ＝1ｇ／cm3所得盐酸的密度为1.18ｇ／cm
在标准状况下将224LHCl气体溶于635mL水中所得盐酸的密度为1.18g/cm3取此盐酸10.0
将标准状况下22.4LHCl气体溶于水配成250mL溶液此溶液中HCl的物质的量浓度为_______
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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.WhydidtheyfoundGoogle
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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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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Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmunizedfrombirthagainstmanyofthemostdangerousdiseases.Alargenumberofoncefatalillnessescannowbecuredbymoderndrugsandsurgery.Itisalmostcertainthatonedayremedieswillbefoundforthemoststubbornremainingdiseases.Theexpectationoflifehasincreasedenormously.Butthoughthepossibilityoflivingalongandhappylifeisgreaterthaneverbeforeeverydaywewitnesstheincredibleslaughterofmenwomenandchildrenontheroads.Manversusthemotorcar!Itisanever-endingbattlewhichmanislosing.Thousandsofpeopleovertheworldarekilledorhorriblykilledeachyearandwearequietlysittingbackandlettingithappen.Ithasbeenrightlysaidthatwhenamanissittingbehindasteeringwheelhiscarbecomestheextensionofhispersonality.Thereisnodoubtthatthemotorcaroftenbringsoutaman’sveryworstqualities.Peoplewhoarenormallyquietandpleasantmaybecomeunrecognizablewhentheyarebehindasteering-wheel.Theysweartheyareill-manneredandaggressivewillfulastwo-year-oldsandutterlyselfish.Alltheirhiddenfrustrationsdisappointmentsandjealousiesseemtobebroughttothesurfacebytheactofdriving.Thesurprisingthingisthatsocietysmilessobenignlyonthemotoristandseemstocondonehisbehaviour.Everythingisdoneforhisconvenience.Citiesareallowedtobecomealmostuninhabitablebecauseofheavytraffic;townsaremadeuglybyhugecarparks;thecountrysideisdesecratedbyroadnetworks;andthemassannualslaughterbecomesnothingmorethanastatistictobeconvenientlyforgotten.Itishightimeaworldcodewerecreatedtoreducethissenselesswasteofhumanlife.Withregardtodrivingthelawsofsomecountriesarenotoriouslylaxandeventhestrictestarenotstrict:enough.Acodewhichwasuniversallyacceptedcouldonlyhaveadramaticallybeneficialeffectontheaccidentrate.Hereareafewexamplesofsomeofthethingsthatmightbedone.Thedrivingtestshouldbestandardizedandmadefarmoredifficultthanitis;allthedriversshouldbemadetotakeatesteverythreeyearsorso;theageatwhichyoungpeopleareallowedtodriveanyvehicleshouldheraisedtoatleast21;allvehiclesshouldbeputthroughstringentannualtestsforsafety.Eventhesmallestamountofalcoholinthebloodcanimpairaperson’sdrivingability.Presentdrinkinganddrivinglawswheretheyexistshouldhemadmuchstricter.Maximumandminimumspeedlimitsshouldbeimposedonallroads.GovernmentsshouldlaydownsafetyspecificationsformanufacturersashasbeendoneintheUSA.Alladvertisingstressingpowerandperformanceshouldbebanned.Thesemeasuresmaysoundinordinatelyharsh.Butsurelynothingshouldbeconsideredassevereifitresultsinreducingtheannualtollofhumanlife.Afteralltheworldisforhumanbeingsnotmotorcars.Whatdoestheauthorthinkofsocietytowardmotorists
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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
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
有三只烧杯分别盛有氯化铜氯化钾和硝酸银三种溶液均以Pt作电极将它们串联在一起电解一定时间测得电极增重总和2.8g这时产生的有色气体与无色气体的物质的量之比为
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
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.
德育过程从本质上说就是统一过程
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./Whatisthepopularimageofteenagerstoday
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
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______.
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.AfterallifyouaregoingtoberuledbythetimewhynotinvestinairantiqueclockandperhapsmakeafutureprofitAccordingtothepassagecollectingantiqueclocks______.
Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmunizedfrombirthagainstmanyofthemostdangerousdiseases.Alargenumberofoncefatalillnessescannowbecuredbymoderndrugsandsurgery.Itisalmostcertainthatonedayremedieswillbefoundforthemoststubbornremainingdiseases.Theexpectationoflifehasincreasedenormously.Butthoughthepossibilityoflivingalongandhappylifeisgreaterthaneverbeforeeverydaywewitnesstheincredibleslaughterofmenwomenandchildrenontheroads.Manversusthemotorcar!Itisanever-endingbattlewhichmanislosing.Thousandsofpeopleovertheworldarekilledorhorriblykilledeachyearandwearequietlysittingbackandlettingithappen.Ithasbeenrightlysaidthatwhenamanissittingbehindasteeringwheelhiscarbecomestheextensionofhispersonality.Thereisnodoubtthatthemotorcaroftenbringsoutaman’sveryworstqualities.Peoplewhoarenormallyquietandpleasantmaybecomeunrecognizablewhentheyarebehindasteering-wheel.Theysweartheyareill-manneredandaggressivewillfulastwo-year-oldsandutterlyselfish.Alltheirhiddenfrustrationsdisappointmentsandjealousiesseemtobebroughttothesurfacebytheactofdriving.Thesurprisingthingisthatsocietysmilessobenignlyonthemotoristandseemstocondonehisbehaviour.Everythingisdoneforhisconvenience.Citiesareallowedtobecomealmostuninhabitablebecauseofheavytraffic;townsaremadeuglybyhugecarparks;thecountrysideisdesecratedbyroadnetworks;andthemassannualslaughterbecomesnothingmorethanastatistictobeconvenientlyforgotten.Itishightimeaworldcodewerecreatedtoreducethissenselesswasteofhumanlife.Withregardtodrivingthelawsofsomecountriesarenotoriouslylaxandeventhestrictestarenotstrict:enough.Acodewhichwasuniversallyacceptedcouldonlyhaveadramaticallybeneficialeffectontheaccidentrate.Hereareafewexamplesofsomeofthethingsthatmightbedone.Thedrivingtestshouldbestandardizedandmadefarmoredifficultthanitis;allthedriversshouldbemadetotakeatesteverythreeyearsorso;theageatwhichyoungpeopleareallowedtodriveanyvehicleshouldheraisedtoatleast21;allvehiclesshouldbeputthroughstringentannualtestsforsafety.Eventhesmallestamountofalcoholinthebloodcanimpairaperson’sdrivingability.Presentdrinkinganddrivinglawswheretheyexistshouldhemadmuchstricter.Maximumandminimumspeedlimitsshouldbeimposedonallroads.GovernmentsshouldlaydownsafetyspecificationsformanufacturersashasbeendoneintheUSA.Alladvertisingstressingpowerandperformanceshouldbebanned.Thesemeasuresmaysoundinordinatelyharsh.Butsurelynothingshouldbeconsideredassevereifitresultsinreducingtheannualtollofhumanlife.Afteralltheworldisforhumanbeingsnotmotorcars.WhichofthefollowingisNOTmentionedasawayagainsttrafficaccidents
用质量均为100.0g的铜作电极电解硝酸银溶液电解一段时间后两电极的质量相差28.0g则阴极的质量为
在一个密闭容器中盛有11gX气体X的摩尔质量为44g·mol-1时压强为1×104Pa如果在相同温度下把更多的气体X充入容器使容器内的压强增至5×104Pa这时容器内气体X的分子数约为
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
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 组成单质A的元素位于周期表中第周期第族
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 H的溶液与稀硫酸反应产生的现象为
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=
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
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