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对比、分析、归纳是学习化学的重要方法.(1)已知H2、CO、C是教案备课库常见的还原剂,请分析下列反应:H2+CuOCu+H2O 3CO+Fe2O32Fe+3CO2C+O2CO2得出的结论是:物...
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1归纳与比较是学习化学的重要方法之一对比CO和CO2它们的组成元素填相同或不同下同但它们的化学性质工
对比分析归纳是学习化学的重要方法1已知H2COC.是常见的还原剂请分析下列反应H2+CuOCu+H2
按要求回答下列问题1已知在常温常压下①2CH3OHl+3O2g===2CO2g+4H2OgΔH=-1
对比分析归纳是学习化学的重要方法1已知H2COC.是常见的还原剂请分析下列反应H2+CuOCu+H2
按要求回答下列问题1已知在常温常压下①2CH3OHl+3O2g===2CO2g+4H2OgΔH.=-
归纳与比较是学习化学的重要方法之一对比CO和CO2它们的组成元素相同但它们的化学性质不同其原因是.
在同温同压下下列各组热化学方程式中△H2>△H1的是
S(s) + O2 (g) =SO2 (g); △H1 S(g) + O2 (g) =SO2 (g);△H2
2H2(g) + O2 (g)= 2H2O(g);△H1 2H2 (g) + O2 (g) = 2H2O(l);△H2
CO(g) + 1/2 O2(g) = CO2(g);△H1 2CO(g) + O2(g) = 2CO2(g);△H2
H2 (g) +Cl2(g)=2HCl(g);△H1 1/2 H2(g) + 1/2 Cl2(g) = HCl(g);△H2
燃烧热是指一定条件下1mol可燃物完全燃烧生成稳定的氧化物时放出的热量已知热化学方程式①COg+1/
由反应①、②可知如图所示的热化学方程式为CO(g)+H2O(g)==== CO2(g)+H2(g)ΔH = -41.2 kJ·mol-1
H2的燃烧热为241.8 kJ·mol-1
H2(g)转变成H2O(g)的化学反应一定要释放能量
根据②推知反应H2(g)+1/2O2(g)==== H2O(l)ΔH > -241.8 kJ·mol-1
1归纳与比较是学习化学的重要方法之一对比CO和CO2它们的组成元素填相同或不同下同但它们的化学性质工
甲醇是人们开发和利用的一种新能源已知①2H2g+O2g===2H2OlΔH1=-571.8kJ·mo
对比分析归纳是学习化学的重要方法1已知H2COC.是常见的还原剂请分析下列反应H2+CuOCu+H2
1g碳与适量水蒸气反应生成CO和H2需吸收10.94kJ热量此反应的热化学方程式为
C.+ H2O == CO + H2 ∆H= +131.3 kJ mol H
-1
C(s)+ H2O(g) == CO(g) + H2(g) ∆H= +10.94 kJ·mol
-1
C(s)+ H2O(l) == CO(g) + H2(g) ∆H= +131.3 kJ· mol
-1
C(s)+ H2O(g) == CO(g) + H2(g)∆H= +131.3 kJ· mol
-1
I..甲醇是一种重要的化工原料有着重要的用途和应用前景工业生产甲醇的常用方法是COg+2H2g===
在同温同压下下列各组热化学方程式中△H2>△H1的是
2H2(g) + O2(g)= 2H2O(g) △H1 ; 2H2(g) + O2(g) = 2H2O(l) △H2
S(g) + O2(g) =SO2(g) △H1 ; S(s) + O2(g) = SO2(g) △H2
CO(g) + 1/2 O2(g) = CO2(g) △H1 ;2CO(g) + O2(g) = 2CO2(g) △H2
C.(s)+H2O(g)=CO(g)+H2(g) △H1 ;CaO(s)+H2O(l)===Ca(OH)2(s) △H2
分析归纳总结是学习化学的有效方法1小东用三总结化学知识如下①复分解反应发生的条件是生成沉淀或生成气体
已知下列三个热化学方程式①H2g+O2g===H2OgΔH1=-241.8kJ·mol-1②C.s+
对比分析归纳是学习化学的重要方法1已知H2COC.是常见的还原剂请分析下列反应H2+CuOCu+H2
对比分析归纳是学习化学的重要方法1已知H2COC.是常见的还原剂请分析下列反应H2+CuOCu+H2
下列各组热化学方程式中△H1>△H2的是①C.s+O2g===CO2g△H1Cs+1/2O2g===
①
④
②③④
①②③
对比分析归纳是学习化学的重要方法1已知H2COC.是常见的还原剂请分析下列反应H2+CuOCu+H2
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So对太空着迷thathedevotedallhisenergytoobservingstars.crazy
该文中共有十处错误每句中最多有两处错误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∧并在此符号下面写出该加的词.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只允许修改十处多者从第11处起不计分. IhaveagoodfriendwhomnameisRose.Lastmonthshelentoneofmyfavoritebook.YesterdayIaskedhertoreturnthebookbacktome.Tomysurprisingshesaidshehadalreadygiventhebooktome.IsearchmydeskandschoolbagbutIdidn'tfindone.Ibecameveryangryaboutherandshoutedathershelefttheclassroomwithtearsinhereyes.HoweverwhenIcamehomelastnight.Iwassurprisedtofindmybooklieundermypillow.NowIregretquarrellingwithher.IamafraidIwilllosefriend.WhatshouldIdo?
SailingThroughHistory Agroupof1309passengersboardedtheMSBalmoralonSundayinSouthamptonEnglandonavoyagetoretracethepathoftheTitanic.TheTitanicwasthebiggestshipintheworldwhenitsailedonitsill﹣fatedmaidenvoyagein1912.Ofthe2227passengersandcrewaboardmorethan1500died.TheshipwhichwasheadedtoNewYorkCitycarriedtherichandfamousonitsfirstvoyage.ItalsocarriedimmigrantswhowereseekingabetterlifeinAmerica. RelativesofpeoplewhosailedontheTitanichistoriansauthorsandpeoplefascinatedbythestoryoftheunsinkableshipareontheBalmoral.Theywanttorememberthedoomedshipandthosewhodiedonherfirstandlastvoyage.ThehistoriclinerhadsetsailonApril101912fromSouthampton.LateatnightonApril14shehitaniceberg.IntheearlymorninghoursofApril15theTitanicsank. TheBalmoralisfollowingTitanic'soriginalroutefromSouthampton.Firstthemodern﹣daycruiselinerdockedintheportofCherbourgFrancewheretheTitanichadpickedupmorepassengers.OnMondayafternoontheBalmoralstopsinCobhIrelandtheTitanic'slastportofcallbeforesailingtoNewYork. BalmoralwillthencruisetheNorthAtlanticOceantothelocationwhereTitanichitanicebergthatrippedtheship'shull外壳.OnSundayApril15at2:20a.m.﹣thetimetheTitanicwentdown﹣passengersandcrewwillholdamemorialservice.ThenexttwodayswillbespentinHalifaxCanadawheremanyvictimsofthesinkingareburied.ThentheBalmoralwillreachitsfinaldestinationinNewYorkCitywhereTitanicwassupposedtodock﹣butneverdid. Untiltodayseveralteamsofdivershaveexploredthesite.Theyhaverecoveredsomeitemssuchasdishesandsilverwareandputthemonpublicdisplay.Andmoretripsareplannedtothewreckageinthefuture.TheTitanicanditspassengersandcrewhavebeenrememberedinbooksmoviesandTVprograms.Butthere'samuchmoreimportantcontributionthatTitanicgaveus.Aftershesanklawmakersandshipbuildersmadeshipssafer.Ittookaterribletragedytomakeshiptravelsaferforall. 1HowmanypassengersinTitanicsurvivedatlast? A.Morethan1500. B.About1309. C.About1000. D.Lessthan750. 2HowmanycountriesdoestheBalmoralreachbeforesailingtoNewYork? A.Two. B.Three. C.Four. D.five. 3TheBalmoralwillstayinCanadajust. A.inmemoryofthedeadpassengersintheBalmoral B.inmemoryofthesurvivorsinTitanic C.inmemoryofthedeadpassengersinTitanic D.inmemoryofthesurvivorsintheBalmoral 4WhatmightbethemostimportantcontributionofsunkenTitanic? A.Itssiteattractsmoreexploringteams. B.Itmakesthelatershipsmoresecure. C.Someofitsitemsareonpublicdisplay. D.Moretripsareplannedtoitswreckage.
Manypeopleholdtheopinionthatisnouseworkhardbecausetheyarenotbornintoprivilegedfamilies.
Inspiringyoungminds! TOKNOWMagazineisabighitintheworldofchildren'spublishingbringingauniquecombinationofchallengingideasandgoodfuntoyoungfanseverymonth. Soundstoogoodtobetrue? Takealookonline﹣evidenceshowsthatthousandsofteachersandparentsknowagoodthingwhentheyseeitandrecommendTOKNOWtotheirfriends. HappyBirthdayAllYear! Whatcouldbemorefunthanagiftthatkeepscomingthroughtheletterboxeverymonth?Thefirstmagazinewithyourgiftmessagewillarriveintimeforthespecialday. SUBSCRIBENOW □AnnualSubscription Europe£55RestofWorld£65 □AnnualSubscriptionwithGiftPack IncludesaMammothMapaPassportPuzzleBookletandSubscription Europe£60RestofWorld£70 RefundPolicy﹣thesubscriptioncanbecancelledwithin28daysandyoucangetyourmoneyback. 1WhyisTOKNOWaspecialmagazine? A.Itentertainsyoungparents. B.Itprovidesseriousadvertisements. C.Itpublishespopularsciencefictions. D.Itcombinesfunwithcomplexconcepts. 2WhatdoesTOKNOWofferitsreaders? A.Onlinecourses. B.Articlesonnewtopics. C.Lecturesonabalancedlife. D.Reportsonscientificdiscoveries. 3Howmuchshouldyoupayifyoumakea12﹣mouthsubscriptiontoTOKNOWwithgiftpackfromChina? A.£55. B.£60. C.£65. D.£70. 4SubscribersofTOKNOWwouldget. A.freebirthdaypresents B.fullrefundwithin28days C.membershipoftheTOKNOWclub D.chancestomeettheexpertsinperson
Wereyouthefirstorthelastchildinyourfamily?Orwereyouamiddleoranonlychild?Somepeoplethink1matterswhereyouwereborninyourfamily.Buttherearedifferentideasaboutwhatbirthordermeans.Somepeoplesaythatoldestchildren2aresmartandstrong﹣willed意志坚强的areverylikely3succeed.Thereason4thisissimple.Parentshavealotoftimefortheirfirstchildandgivehimorheralotofattention.Anonlychildwillsucceedfor5samereason. Whathappenstothe6childreninthefamily?Middlechildrendon'tgetsomuchattentionsotheydon'tfeelthatimportant.Ifafamilyhasmanychildrenthemiddleonesometimesgetslostinthecrowd.Theyoungestchild7oftengetsspecialtreatment.Oftenthischildgrowsuptobefunny.Butarecentstudysawthingsquite8difference.Thestudyfoundthatfirstchildrenbelievedinfamilyrules.Theydidn'ttakemanychancesin9lives.Theyusually10followorders.Rulesdidn'tmeanasmuchtolaterchildreninthefamily.Theytookchancesandtheyoftendidbetterinlife.
Thedoctorsaiditwasonlyaslightwound.Whatar.
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