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加热氯酸钾（化学式为KClO3）和催化剂二氧化锰的混合物可制备氧气，同时生成氯化钾，该反应的化学方程式为 ，但实验中发现有刺激性气味的气体产生． 【提出问题】刺激性气味的气体是什么呢？ 【猜...
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实验室用加热氯酸钾和少量二氧化锰的混合物来制取氧气已知反应前二氧化锰占混合物质量的20%加热一段时间
实验室里利用加热氯酸钾和二氧化锰固体混合物来制取氧气在该反应中二氧化锰作了氯酸钾反应的催化剂下列说法
二氧化锰的质量和化学性质在反应前后不改变
二氧化锰可以作为各种化学反应的催化剂
加入二氧化锰增加了生成氧气的质量
不加入二氧化锰，加热氯酸钾不会生成氧气
实验室制氧气的方法有好几种加热氯酸钾和二氧化锰的固体混合物可制得氧气氯酸钾能溶于水反应后生成物除了氧
在实验室用氯酸钾和二氧化锰混合物加热制取氧气的反应过程中若二氧化锰在混合物中的质量分数由20％提高到
下列有关实验室用氯酸钾制氧气的叙述中正确的是
等质量的氯酸钾加入二氧化锰加热比不加入二氧化锰放出氧气的量多
要使氯酸钾受热分解放出氧气，必须加热二氧化锰
二氧化锰在氯酸钾反应前后质量和化学性质都保持不变
二氧化锰是一切化学反应的催化剂
验证二氧化锰是氯酸钾制取氧气的催化剂：只需分别加热氯酸钾．氯酸钾和二氧化锰的混合物
证明氮气和氧气的混合气体中混有氧气：用带火星的木条伸入混合气体中
从氮气和氧气的混合气体中得到纯氮气：用红热的木炭在混合气体中燃烧
区别空气．氧气．氮气：用燃着的木条分别伸入气体中
将氯酸钾和二氧化锰的混合物加热后固体混合物中二氧化锰的质量和原来相比_____二氧化锰的质量百分含量
在10克氯酸钾和二氧化锰的混合物中含二氧化锰10%加热后冷却试管中剩余固体含二氧化锰为12.5%求氯
已知实验室可用加热氯酸钾和二氧化锰的混合物制氧气其中二氧化锰是催化剂某同学在用加热氯酸钾制氧气的实验
反应较慢，但反应完全后产生氧气的总量不变
反应较慢，且反应完全后产生氧气的总量减少
反应正常，产生氧气总量不变
反应正常，产生氧气总量减少
氯酸钾KClO3在二氧化锰MnO2作催化剂并加热条件下反应生成氯化钾KC1和氧气．将氯酸钾与二氧化锰
实验室用氯酸钾在二氧化锰催化作用下制取氧气现取氯酸钾和二氧化锰的混合物共50g加热完全反应后称得剩余
实验室可用加热氯酸钾与二氧化锰的混合物制取氧气现加热氯酸钾与二氧化锰的混合物30g待氯酸钾完全反应后
实验室利用加热氯酸钾和二氧化锰固体混合物来制取氧气在该反应中二氧化锰作了催化剂下列说法中正确的是
二氧化锰的质量和化学性质在反应前后不改变
二氧化锰可以作为各种化学反应的催化剂
加入二氧化锰增加了氧气生成的质量
不加入二氧化锰，加热氯酸钾不会生成氧气
【写出计算过程】实验室加热氯酸钾KClO3和二氧化锰作催化剂的混合物制取氧气同时生成KCl.若收集到
取氯酸钾和二氧化锰混合物12g制氧气加热一段时间后测得50%的氯酸钾分解将剩余的固体冷却称量其质量为
取氯酸钾和二氧化锰的混合物12克制取氧气加热一段时间后测得50％的氯酸钾分解将剩余的固体冷却后称量其
某校化学兴趣小组的同学对加热氯酸钾与二氧化锰的混合物制取氧气实验中二氧化锰充当的角色进行了探究请你参
氯酸钾KClO3固体在二氧化锰作催化剂并加热的条件下能较快的分解生成氯化钾和氧气1反应后将二氧化锰从
把干燥纯净的氯酸钾和二氧化锰的混合物31g加热分解反应完全后剩余固体物质的质量为21.4g求1生成氧
实验室利用加热氯酸钾和二氧化锰固体混合物来制取氧气在该反应中二氧化锰作了催化剂下列说法中正确的是
二氧化锰的质量和化学性质在反应前后不改变
二氧化锰可以作为各种化学反应的催化剂
加入二氧化锰增加了氧气生成的质量
不加入二氧化锰，加热氯酸钾不会生成氧气
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如图正方形ABCD中AB＝2O是BC边的中点点E是正方形内一动点OE＝2连接DE将线段DE绕点D逆时针旋转90°得DF连接AECF．则线段OF长的最小值
6分Youngerstudentsexperienceschoolbullying欺凌morefrequentlythanolderonesandmalestudentsarebulliedmorethantheirfemalepeersasurveyfound.Italsofoundthatnearlyhalfofstudentshadbeenintentionallyhitorknockeddownbyclassmates.About6percentsaidtheyaretargetedbybulliesoncampuseveryday.Thesurveyalsofoundthatstudentsfromordinaryschoolsexperiencedmorebullyingthanpeersfromkeyinstitutionsandchildrenfrompoorfamiliesaremorelikelytobebulliedatschool.Beingbulliedcanhaveanegativeimpactonachild'spersonaldevelopmentandacademicperformanceaccordingtoZhouJinyanaresearcherwholedthestudyatBeijingNormalUniversity.ChildrenbeingbulliedwillfindithardtotrustothersZhousaid.Theymayoftenfeelanxietyangerresentmentordepression.Theseemotionswillfurtherunderminetheirabilitytocontroltheirownlife.InrecentyearsbullyingonChinesecampuseshasbeenfrequentlyreportedandhasattractedwidespreadattentionandconcern.ThemostrecentincidenttoarouseheateddiscussionstookplaceinDecemberatBeijing'sZhongguancunNo.2PrimarySchool.Afourth﹣gradestudentwasbulliedandlaughedatbyclassmatescausinghimacutestressdisorder.TheSupremePeople'sProcuratorate最高人民检察院receivedabout1900casesrelatedtoschoolbullyingin2016.Meanwhiletherewasanotableincreaseinbullyingreportsinvolvingmiddleschoolstudentsfrom14to18yearsold.Zhoucameupwithsomewaystosolvetheproblemincludingboostingcommunicationbetweenteachersparentsandstudentsandtryingtoestablishmoreharmoniousrelationshipsamongchildren.Shesaiditwasstronglysuggestedthatparentstrytobeinvolvedintheirchildren'seducationalexperienceastheirpresenceandcompanionshiphaveprovedeffectiveinreducingbullyinganditsnegativeeffects.1Whoisthemostlikelytobecomethetargetofbullying?A.A17﹣year﹣oldboyfromarichfamilyB.A17﹣year﹣oldgirlfromanordinaryschoolC.A10﹣year﹣oldgirlfromakeyschoolD.A10﹣year﹣oldboyfromapoorfamily2BeingbulliedwillcausestudentstogothroughthefollowingEXCEPT.A.alackoftrustinotherpeopleB.adropinthesenseofdepressionC.adropinacademicperformanceD.alackofconfidenceinthemselves3Wecanlearnfromthetextthat.A.bullyingatschoolusuallyleadstoacutestressdisorderB.studentswhoenjoyparents'companionshipwillbebullying﹣freeC.bullyingoncampushasbeenbroughtintosharpfocusbythemediaD.thegovernmentshouldconsidertakingfurtheractionagainstbullyingatschool
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关于x的一元二次方程x2﹣3x+m＝0有两个不相等的实数根则m的取值范围为
8分AlthoughmanyChinesestudentssaythattheirknowledgeofEnglishgrammarisgoodmostwouldadmit承认thattheirspokenEnglishispoor.WheneverIspeaktoaChinesestudenttheyalwayssayMyspokenEnglishispoor.HowevertheirspokenEnglishdoesnothavetoremainpoor!IwouldliketosuggestthattheremaybesomereasonsfortheirproblemswithspokenEnglish.Firsttheyfailtofindsuitable适合的wordstoexpressthemselvesduetoalimited有限的vocabulary.Obviouslythebetteransweristoexpand扩大theirvocabulary.Howeveryoucanspeakwithalimitedvocabularyifyourattitudeispositive.Otherswillfollowyouaslongasyouusethewordsthatyouknow.Secondthey'reafraidofmakingmistakes.Sometimestheymakemistakeswhentheyarespeakingbecausetheyareshyandnervous.Yetstudentsshouldrememberthattheirgoalshouldbefluencynotaccuracy准确性.Youraiminwritingistobeaccuratefollowingtherulesforgrammarandusingtherightwordsandspellingthemcorrectly.Howeverinspeakingyouraimisfluency.YouwanttogetyourmessageacrosstotalktosomeoneinEnglishasquicklyandaswellasyoucaneventhoughsometimesyoumayuseawrongwordortensebutitdoesn'tmatterbecausethepersonyouarespeakingtowillunderstandyouandmakeallowancesfor体谅anymistakeshehears.Thethirdreasonisthatnotenoughattentionispaidtolistening.Youhaveonemouthbuttwoears!Allthathearingwasnecessaryforyoutostartspeaking.FourthmostChinesestudentsarereactive应式的thanproactive积极主动的languagelearners.Insteadofactivelyseekingoutopportunities机会toimprovetheirspokenEnglishtheypassivelywaitforspeakingopportunitiestocometothemandwonderwhytheirEnglishalwaysremainspoor.Ifyouhavethisproactiveoutlook看法thenyouwillseeEnglishopportunitieswhereveryougo.Ifyoudon'tuseyourEnglishbeyondtheclassroomyou'llforgetwhatEnglishyouknow.Remember:useitorloseit!YoucanlearnhowtospeakEnglishbetterbyspeakingEnglishmore.1Whatcanbeinferredfromthethirdparagraph?A.Don'tbefluent.Justbeaccurate!B.Don'tbenervousdon'tbeshy.Justwrite!C.Don'tbeafraidofmakingmistakes.Justspeak!D.Don'tbeshydon'tbefluent.Justlistenandwrite!2ToimprovetheirspokenEnglishstudentsshoulddothefollowingthingsEXCEPT.A.trytheirbesttoenrichtheirvocabularyB.trytoavoidbeingafraidofmakingmistakesC.paymoreattentiontolisteningbeforeopeningmouthD.trytobeasreactiveaspossibleinlearningEnglish3Whatisthemainideaofthelastparagraph?A.Silenceisgold.B.BetterlatethanneverC.Morehurrylessspeed.D.Practicemakesperfect4Wheredoesthepassageprobablycomefrom?A.Ateacher'sdiary.B.Areportonstudy.C.Asportsnewspaper.D.Amoviemagazine.
15分1ispossiblethatwesimplydonotstayinoneplaceforatruefriendshiptodevelop.Howevertherecanbenodisagreementontheneedforeachofus2thinkcarefullyaboutthekindoffriendshipswewant. Tomostofusfriendshipsareconsidered3importancebutneedtohaveclearinourownminds4kindsoffriendshipswewant.Aretheytobecloseor5keepatarm'slength?Dowewanttoshareourselvesordowewanttowalkonthesurface?Forsomepeoplemanyfriendshipsonthesurfacearequiteenough﹣andthat'sallright.Butatsomepointweneedtomakesurethatourexpectationsarethesameasour6friendexpectations.Ifonewantsmorefromthefriendshipthantheother7ifthisisnottalkedaboutoneislikelyatlasttofeelthathe'sholdingtheshortendofthestick.Thesharingofpersonalexperience8includeourtearsaswellasourdarkdreams9bethesurestwaytodeepenfriendships.Butitmustbeundertakenslowlyandcarriedononlyiftheresignsofinterestandaction10return.
8分 LOCALEVENTS AFewGoodMen Drama戏剧GeekStudioswillbecontinuingperformancesofAFewGoodMenattheStudentCenterTheatreatSussexCountyCommunityCollegeonNov13Nov14at8p.m.andNov15at2p.m.. Toobtainticketsvisitwww.afgm.bpt.meorcall973﹣512﹣8251.Discountedticketpriceforcurrentservicemanandveterans退伍军人. NewtonWoman'sClubLunch TheWoman'sClubofNewtonwillholditsRedStockingLunchatnoononDec.8attheNewtonCountryClub.MembersmustreturntheirreservationformsbyNov13.Past﹣membersandfriendsofNewtonEMDJuniorsandWoman'sClubarewelcome. ForreservationscallBarbaraSantosat862﹣268﹣5257. Alzheimer'sSeminar Alzheimer'sAssociationSussexCountyCaregiverConferencepresentsApproachestoCarealongwithUnitedWayofNorthernN.J.NewtonMedicalCenterandSussexCountyDivisionofSeniorServices. TheseminarwillbeheldatNewtonMedicalCenteronNov.7from8:30a.m.tol2:30p.m.Theseminarisfreeandopentopublicbreakfastprovided. Pleasecall973﹣586﹣4300. GreendellStationMuseumMeeting GreendellStationMuseumishostingamembershipmeetingopentoallonNov.7at7p.m.attheGreenTownshipMunicipalBuilding.UpdatesonthemuseumprojectattheGreendelltrainstationwillbediscussedandspecialpresenterBillNelsonwillprovideadigitalphotopresentationonarearailroadsandtheirhistories. MoreinformationisavailableonFacebookunderGreendellNJStationMuseum. 1Wecangetaticketfordramaperformancesby. A.Bycalling862﹣268﹣5257 B.Bycalling973﹣586﹣4300 C.Byvisitingwww.afgm.bpt.me D.BycallingBarbaraSantos. 2WhatcanwedoonDec8? A.Attendamedicalseminar. B.EnjoyourselvesatRedStockingLunch. C.PayavisittoSussexCountyCommunityCollege. D.DiscussthemuseumprojectattheGreendelltrainstation. 3WhatcanwelearnaboutAlzheimer'sSeminar? A.Itwilllastforfourhours. B.Itwillprovidefreelunch. C.ItwillbeheldatNewtonMedicalCentre. D.Itrequiresreservationsinadvance. 4InordertolistentoBillNelson'sspeechweshouldgoto. A.SussexCountyCommunityCollege B.theGreenTownshipMunicipalBuilding C.theNewtonMedicalCenter D.theNewtonCountryClub
如图ABCD是⊙O上的四个点＝∠AOB＝58°则∠BDC的度数是
8分IwastellingmyboySonnythestoryofthehare兔子andthetortoise乌龟.AttheendIsaidSonremember:Beslowandsteady镇定的andthatwillwintherace.Don'tyouthinkthere'ssomethingtolearnfromthetortoise? SonnyopenedhiseyeswideDoyoumeannexttimewhenI'menteringforthe60﹣metreraceIshouldwishthatBillyTonyandSandywouldallfallasleephalfway? IwasshockedButthetortoisedidn'twishthattheharewouldfallasleep! HemusthavewishedthatSonnysaidOtherwisehowcouldhebesofoolishastoracewiththehare?Heknewverywellthehareranahundredtimesfasterthanhehimselfdid. Hedidn'thavesuchawishIinsisted.Hewontheracebyperseverance坚忍不拔的bypushingonsteadily. Sonnythoughtawhile.That'saliehesaid.Hewonitbecausehewaslucky.Iftheharehadn'thappenedtofallasleepthetortoisewouldneverhavewontherace.Hecouldbeassteadyasyoulikeorahundredtimessteadierbuthe'dneverhavewontherace.That'sforsure. Igaveup.Today'schildrenarenotlikewhatweusedtobe.They'rejusthopeless. 1Thewriterargued辩论withhissonbecause. A.helikedtortoiseswhilehissonlikedhares B.theydisagreedaboutwhetherthetortoisewasfoolish C.hetriedtoteachhissonamorallessonbutthesonhadtotallydifferentopinion D.helikedthestoryofthehareandthetortoisewhilehissondidn't. 2BillyTonyandSandymustbe. A.boyswhowereunknowntoSonny'sfather B.boyswhoSonnyhasrunraceswithbefore C.boyswhoSonnyhasneverracedwithbefore D.boyswhoSonnydidnotexpecttoracewithagain 3Thewriterthinksthathisgeneration一代人. A.areclevererthanSonny'sgeneration B.havethesameideasaboutlifeasSonny'sgeneration C.aremorehopefulthanSonny'sgeneration D.havedifferentideasaboutlifefromSonny'sgeneration 4Accordingtothepassagewhodoyouthinklearntalesson? A.Thetortoise. B.Sonny. C.Thehare. D.Sonny'sfather.
25分Writeashortcompositiononagreatwomanyoulikemostandwhatyoulearnfromher. AgreatwomanIadmire
因式分解ab2﹣a＝．
15分JosephHenrywasanAmericanscientist.Hewas1firstSecretaryoftheSmithsonianInstitution.Heusedtotellaratherstrangestoryabouthischildhood.Hisgrandmother2raisedhimpaidacobbler制鞋匠tomakehimapairofshoes. Thecobblermeasured3feetandtoldJosephthathecouldchoosebetweentwostyles:aroundedtoe4asquaretoe.LittleJosephcouldn'tdecide.Itseemed5besuchabigdecision;afteralltheywouldbecomehisonlypairofshoesforalongtime. Thecobblerallowedhim6takeacoupleofdaystomake7hismind.DayafterdayJosephwentintotheshopsometimesthreeorfourtimesaday!Eachtimehelookedoverthecobbler'sshoesandtriedtodecide.Therounded﹣toedshoesweremorepracticalbutthesquared﹣toedshoeslookedmuch8nice.Hecontinuedtohesitateandcouldn'tdecide! Finallyonedayhewentintotheshopandthecobblerhandedhimasmallpackage9waswrappedinbrownpaper.Hisnewshoes!Hewenthome.Heopenedthepackageand10findabeautifulpairofleathershoes﹣onewitharoundedtoeandtheotherwithasquareone.
1分ItisoneofthemostinterestingbookthatI'veeverread.
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