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实验室欲配制50g溶质质量分数为15%的食盐溶液,下列说法不正确的是( )
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实验室欲配制溶质质量分数4%的NaOH溶液200g需水的质量为
8 g
192 g
196 g
200 g
某同学配制50g溶质质量分数为5%的食盐溶液称量时将砝码放在左盘1g以下用游码食盐放在右盘量水时仰视
等于5%
大于5%
小于5%
不能确定
现有质量分数为15%的食盐溶液20g质量分数为40%的食盐溶液15g另有足够多的食盐固体和水要配制质
实验室中现有足量的蔗糖固体足量的水80g溶质质量分数为5%蔗糖溶液50g溶质质量分数为20%蔗糖溶液
20.某同学在配制50g溶质量分数为5%的食盐溶液的实验中称量时将砝码放在左盘1g以下用游码食盐放在
等于5%
大于5%
小于5%
不能确定
现有50g溶质质量分数为10%的食盐溶液若使溶液的溶质质量分数增加一倍应向此溶液中加入食盐_____
从50g溶质质量分数为20%的食盐溶液中取出5g溶液后所得溶液的溶质质量分数为
4%
10%
15%
20%
实验室欲配制50g溶质质量分数为5%的食盐溶液回答下列问题1需要要纯净的氯化钠克需要ml量筒量取ml
要配制100gl0%的食盐溶液实验室现有足量的食盐足量的水200g596的食盐溶液100g20%的食
将10g食盐溶于90g水中
在50g20%的食盐溶液中加入50g水
将7g食盐溶予93g5%的食盐溶液中
在66.67g5%的食盐溶液中加入33.33g20%的食盐溶液
实验室配制50g溶质质量分数为15%的氯化钠溶液下列说法中错误的是
实验的步骤为计算、称取、量取、溶解、转移
溶解过程中玻璃棒的作用是搅拌,以加快氯化钠的溶解速度
氯化钠称量完毕放回砝码时,发现5g的砝码有缺损,则所配溶液的质量分数大于15%
量取水时,用规格为50ml的量筒量取42.5ml蒸馏水
化学实验中经常用到一定溶质质量分数的溶液Na2CO3溶液也呈碱性请回答1实验室配制质量分数4%的氯化
现有50g溶质质量分数为10%的食盐溶液若使溶液的溶质质量分数增加一倍1应向此溶液中加入食盐多少g?
实验室用已配制好的质量分数为6%的氯化钠溶液密度约为1.04g/cm3配制50g溶质质量分数为3%的
在实验室配制溶液时常涉及以下过程①称量量取②过滤③蒸发结晶干燥④计算⑤溶解.请按要求回答下列问题1甲
现有100g溶质质量分数为10%的食盐溶液若使溶液的溶质质量分数增加一倍下列操作中正确的是
加入食盐10g
加入水50g
蒸发掉水50g
加入100g 溶质质量分数为10 %的食盐溶液
将100g质量分数为0.05的食盐溶液改变成质量分数为0.10则下列操作可行的是
加入5g食盐
蒸发掉50g水
加入50g食盐
取出50g溶液即可
在实验室配制溶液时常涉及以下过程①称量量取②过滤③蒸发结晶干燥④计算⑤溶解请回答下列问题1甲同学用氯
实验欲配制50g质量分数为5%的食盐溶液试回答下列问题⑴该实验的操作步骤为_____________
玻璃棒是常用的实验仪器下列实验操作中需要使用玻璃棒的是①过滤②实验室制氯气③稀释浓硫酸④用食盐配制5
①和②
①③④
①
①②③④
请回答并完成下列计算1实验室要配制50g溶质质量分数为8%的氢氧化钠溶液需称取______g氢氧化钠
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8分Thesecrettohappinessiskeepingbusyresearchhasfound.Keepingthemindoccupiedwithtasks﹣nomatterhowmeaningless﹣keepsoffnegativeemotionsthestudyfound. HoweverthebadnewsisthathumansareseeminglyborntobelazyinordertosaveenergyaccordingtoProfessorChristoperHseeabehavioralscientistatChicagoUniversity. Inastudy98studentswereaskedtocompletetwosurveys.Aftertheyhadcompletedthefirsttheyweremadetowait15minutestoreceivethenextone.Theyweregivenachoiceofeitherhandinginthefirstsurveynearbyoramoredistantlocationtheyhadtowalkto.Whicheveroptiontheychosetheyreceivedachocolatebar.Itturnedoutthatabouttwo﹣thirds68studentschosethelazyoption.Thosewhohadtakenthewalkreportedfeelinghappierthanthosewhohadstayedput. ProfessorHseeconcludedthatkeepingbusyhelpedkeeppeoplehappy.HesaidthefindingsreportedinthejournalPsychologicalSciencehadpolicyimplications暗示. Governmentsmayincreasethehappinessofidle无所事事的citizensbyhavingthembuildbridgesthatareactuallyuselessheproposed. AtthepersonallevelheadvisedGetupanddosomething.Anything.Eveniftherereallyisnopointtowhatyouaredoingyouwillfeelbetterforit.HeaddedIncidentallythinkingdeeplyorengaginginself﹣reflectioncountsaskeepingbusytoo. Youdonotneedtoberunningaround.Youjustneedtobeengagedeitherphysicallyormentally. 1Accordingtothepassagewhycankeepingbusymakepeoplehappy? A.Itcanhelppeoplekeepofflaziness. B.Itcanmakepeoplesleepbetter. C.Itcanhelpgetridofunpleasantfeelings. D.Itcangivepeopleasenseofachievement. 2WhichofthefollowingstatementsisTRUEaccordingtothepassage? A.Thefindingmaycontributetopolitics. B.TheofficialshavetakenPro.Hsee'sadvice. C.Inthestudyonethirdstudentshandedinthefirstsurveynearby. D.Governmentscanincreasecitizens'happinessbybuildingbridges. 3Whatcanweinferfromthepassage? A.Everybodyiscertainlyborntobelazy. B.Beingengagedcanaddtothepossibilityofbeingpleased. C.Prof.Hsee'sfindingwaspublishedinPsychologicalScience. D.Onlybykeepingworkingallthetimecanyougainhappiness. 4Whydoestheauthorwritethispassage? A.Toexplainwhathappinessis. B.Toadvisepeoplenottobeidle. C.Toadvisepeopletodowhatevertheyprefer. D.Toshowpeoplehowtotakeworkseriously.
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25分假如你叫李华刚刚升入高中.开学已经3个月了请你写信给老朋友琳琳.内容主要如下: 1.你认识了很多新同学和老师还结交了许多新朋友其中同桌怡欣是你最好的朋友 2.询问关于琳琳的一些情况朋友老师或学习状况等 3.希望大家都能努力为三年后的高考而奋斗. 注意: 1词数:100左右 2开头和结尾已经给出不计入总词数 3参考词汇:theNationalCollegeEntranceExaminations高考 DearLinlin Howtimeflies!IthasbeenaboutthreemonthssinceIenteredhighschool. Longliveourfriendship! Yourbestfriend LiHua
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1分Therewasatimethatonehadgottohaveapassbooktolivethere.
10分LittleTommywasdoingverybadlyinmath.Hisparentshadtriedeverything﹣tutors家庭教师cardsspeciallearningcenters﹣inshorteverythingtheycouldthinkof.FinallytheytookTommytoacatholictiān zhǔ jiāo 的school.AfterthefirstdaylittleTommycamehomewithaveryseriouslookonhisface.Hedidn'tkisshismotherhello.Insteadhewentstraighttohisroomandstartedstudying.Booksandpaperswerespread铺开outallovertheroomandlittleTommywashardatwork.Hismotherwassurprised.Shecalledhimdowntodinnerandassoonashefinishedeatinghewentbacktohisroomwithoutaword.Innotimehewasbackhittingthebooksashardasbefore.Thiswentonforsometimedayafterdaywhilethemothertriedtounderstandwhatwashappening.FinallylittleTommybroughthomehisreportcard.Hequietlyputitonthetableandwentuptohisroomandhitthebooks.HismomlookedatitandtohersurpriselittleTommygotanAinmath.Shecouldnolongerholdhercuriosity好奇心.ShewenttohisroomandaskedSonwhatwasit?Wasitthenuns修女?LittleTommylookedatherandshookhisheadNo.Wellthensheaskedagain.WHATwasit?LittleTommylookedatherandsaidWellonthefirstdayofschoolwhenIsawthatmannailed钉totheplussign加号Iknewtheyweren'tjoking.1WhydidTommy'sparentssendhimtoacatholicschool?A.Becausehecouldeatwellthere.B.Becausehecouldearnmoreaboutnuns.C.Becausehisparentswantedhimtodobetterinhismath.D.Becausehisparentsdidn'twanthimtolearnmathanymore.2Tommy'smotherfeltsurprisedthathisson.A.wasstillthesameasusualB.atesomuchatdinnerC.kissedherhelloafterschoolD.workedhardbutsaidlittle3HittingthebooksmeansinChinese.A.用功B.捶书C.发泄D.振作4Thelastsentenceinthepassageshowsthat.A.TommyfeltsorryforthemailB.TommywasafraidofbeingnailedC.Tommydidn'tliketheplussignD.Tommylikedplayingjokesonothers5Fromthepassagewecaninfer推断that.A.teachersshouldbestrictwiththeirstudentsB.mistaking误解mightdogoodsometimesC.acatholicschoolismuchbetterthanotheronesD.nunsaregoodathelpingchildrenwiththeirmath
30分Aladywantedabirthdaygiftfromherhusband.Formanyyearsshehadlikedabeautiful1andknowingherhusbandcould2itshetoldhimthatwasallshewanted.Onthemorningofthe3herhusbandtoldherhow4hewastohavesuchagoodwifeandhowmuchhelovedher.He5herabeautifulgiftpackage包装盒.Sheopeneditand6aBibleshèng jīng .7sheraisedhervoiceandsaidtoherhusbandWithallyourmoneyyougivemeaBible?Shewasso8thatshelefthim.Manyyearspassedandtheladywasvery9inbusiness.Sheownedtwolargecompanies.She10herhusbandwasveryoldandthoughtperhapssheshouldgoto11him.Butbeforeshecouldshe12alettertellingherthathehaddiedandgaveallofhispossessions财产toher.Sheneededtocomebackand13things.Whenshearrivedathishousesadness14herheart.Shesawthestillnew15justasshehadleftityearsbefore.With16sheopeneditandbegantoturnthepages.Aring17fromtheBibletotheflooranda18couldbeseen.Shepickeditupandfounditwastheringshewantedinthosedays.AndonthecardwasthedateofherbirthandthewordsLOVEUALWAYS.19yourgiftisnotpackagedthewayyouwantitit'sbecauseitisbetterpackagedthewayitis!Alwaysappreciatelittlethings.Theyusuallyleadyoutobiggerthings!Thebestandmostbeautifulthingsintheworldcannotbeseenoreventouchedfortheymustbefeltwiththe20.1A.watch B.coat C.box D.ring2A.afford B.sell C.like D.guess3A.meeting B.performance C.birthday D.holiday4A.proud B.sorry C.brave D.kind5A.lent B.asked C.gave D.moved6A.held B.missed C.carried D.found7A.Patiently B.Angrily C.Politely D.Lightly8A.quiet B.disappointed C.careless D.thankful9A.lonely B.failing C.successful D.poor10A.realized B.wondered C.hoped D.explained11A.visit B.understand C.help D.catch12A.passed B.wrote C.received D.sent13A.giveup B.payfor C.takecarefor D.lookfor14A.filled B.hurt C.left D.hit15A.table B.Bible C.letter D.car16A.laughter B.tears C.smiles D.interests17A.hid B.disappeared C.made D.dropped18A.flower B.card C.pen D.book19A.But B.And C.If D.So20A.heart B.eye C.hand D.face
1分Iusedtoplayping﹣pongalotinmysparetimebutnowIaminterestinginfootball.
10分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.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.每处错误及其修改仅限一词. 2.只允许修改10处多者从第11处起不计分. Ibroughtupbymygrandmother.ShewasoneofthepeoplethatIlovedthemmost.Ididn'tknowwhattopayherbackexceptspendingmoretimeonher.Mygrand﹣motherhadapoormemory.OneSundaywetookawalkinthepark.Whenherneighborgreetedhershejuststaredatthemunabletorecognizewhotheyare.Itmademefeelquitesadly.Itwasliketakealittlechildforawalk.ButthatdayIenjoyedourwalkingasIheldherhand.Thatwasalastwalkweevertooktogetherintheparkbeforeshewastakentohospital.Lessthanayearlateshewasgone.
10分Manypeople'spictureofknitting编织includesgrandmotherssittinginrockingchairswithafatcatintheirlaps.Butteenagersaretakinguptheoldartsofknittingandturningthemintotrendyhobbies. 1anditwassometimeshardtofindniceyarn纱线intheUS.Notanymore. AnelAguayoisknownastheyarnladyatBeverlyFabricsinSanJoseCalifornia.ShesaysthatyarnsellsfasterthanIcanputitout.2.Evenkidsasyoungas11shopthere. CassieMarshall14beganknittingabouttwoyearsagoafterhergrandmothertaughtherhow.AtherschoolaclubsoldthingsthestudentsknittedtoraisemoneyforHurricaneKatrinavictims. 3.LaceyCopestartedcrocheting钩编whenshewaseightandbegantoknitat12. ItisrelaxingandgivesmesomethingtodowithmyhandsCopeexplained. Copehasnoticedthepopularityofherhobby.Itusedtodrivemecrazyseeingpeopletryingtoknit.NowIlikeitbutonlyiftheyaretryingforthemselvesnotbecauseitispopular. ShelearnedtoknitfromtheInternet.4. AtWaldorfSchoolsknittingispartofthecurriculum课程forboysandgirls.5. A.Herdepartmentisalwayscrowded B.Ifyouarelookingforahobbygiveknittingatry C.Tenyearsagofewyoungpeopleknewhowtoknit D.AndshefindspatternsandbuysyarnthrougheBay E.Afewkidsstartedknittingbeforeitbecamepopular F.Alotoftimeinclasspeopleknitinsteadofstudying G.Theschoolbelievesknittinghelpschildrenlearnhand﹣eyecoordination协调andimprovestheirstudyskills
下列图案中既是轴对称的图形又是中心对称的图形的是
已知圆锥的底面半径为2cm母线长是4cm则圆锥的侧面积是cm2结果保留π.
1分IwillgraspeverychancestudyEnglishinmylife.
6分Doyouwanttoimprovethewayyoustudy?Doyoufeelnervousbeforeatest?Manystudentssaythatalack缺少ofconcentration注意力istheirbiggestproblem.Itseriouslyaffects影响theirabilitytostudysodotheirtestresults.Ifsousethesetipstohelpyou.StudyTechniques•Youshouldalwaysstudyinthesameplace.Youshouldn'tsitinapositionthatyouuseforanotherpurpose.Forexamplewhenyousitonasofatostudyyourbrainwillthinkitistimetorelax.Don'twatchTVwhileyouarestudying.Expertswarnthatyourconcentrationmaybereducedby50percentifyoutrytostudyinthisway.Alwaystrytohaveawhitewallinfrontofyousothereisnothingtodistractmakelessconcentratedyou.Beforesittingdowntostudygathertogetheralltheequipmentyouneed.Apartfromyourtextbookspenspencilsandknivesmakesureyouhaveadictionary.Ifyourstudydeskortableisneededwhenyouarenotstudyingstoreallyourequipmentinaboxbesideit.•Youreyeswillbecometiredifyoutrytoreadatextwhichisonaflatsurface.Positionyourbookatanangleof30degrees.•Berealisticanddon'ttrytocompletetoomuchinonestudyperiod.Finishonethingbeforebeginninganother.Ifyouneedabreakgetupandwalkaroundforafewminutesbuttrynottotelephoneafriendorhavesomethingtoeat.Test﹣takingSkills•Allyourhardworkwillbefornothingifyouaretoonervoustotakeyourtest.Gettingenoughrestisveryimportant.Thismeansdonotstudyallnightbeforeyourtest!Itisabetterideatohavealong﹣termstudyplan.Trytomakeatimetableforyourstudywhichlastsforafewmonths.•Exerciseisagreatwaytoreducepressure压力.Doingsomeformofexerciseeverydaywillalsoimproveyourconcentration.Eathealthyfoodtoo.•Whenyouarriveintheexaminationroomfindyourseatandsitdown.Breatheslowlyanddeeply.Checkthetimeontheclockduringthetestbutnottoooften.Abovealltakenonoticeofeveryoneelseandgivethetestpaperyourundividedattention.1Whichofthefollowingstatementsistrueaccordingtothepassage?A.Youshouldstudyinadifferentplaceeverydaysoyoudon'tgetbored.B.YourconcentrationwillimproveifyoustudyandwatchTVatthesametime.C.Checkthetimeduringtheexamatacertaintime.D.Stayingupallnightandstudyingistiringbutyouwilllearnalotusingthismethod.2Whatdoestheunderlinedworditreferto?A.Yourstudydeskortable.B.Yourtextbook.C.Yourdictionary.D.Theequipmentyouneed.3Whatcanbeinferredfromthepassage?A.Youshouldn'tlookateveryoneelseduringthetest.B.Youwillhaveenoughenergytodealwithyourstudyandexamsbyeatinghealthydiet.C.You'llconcentratemoreifthereisnothingtodistractyou.D.Ifyoufeeltiredduringstudyyoucanwalkaroundforafewminutes.
10分LindaEvanswasmybestfriend﹣likethesisterIneverhad.Wedideverythingtogether:pianolessonsmoviesswimminghorsebackriding. WhenIwas13myfamilymovedaway.LindaandIkeptintouchthroughlettersandwesaweachotheronspecialtime﹣likemywedding婚礼andLinda's.Soonwewerebusywithchildrenandmovingtonewhomesandwewrotelessoften.OnedayacardthatIsentcamebackstampedAddress地址Unknown.IhadnoideahowtofindLinda. OvertheyearsImissedLindaverymuch.Iwantedtoshare分享happinessofmychildrenandthengrandchildren.AndIneededtosharemysadnesswhenmybrotherandthenmotherdied.TherewasanemptyplaceinmyheartthatonlyafriendlikeLindacouldfill. OnedayIwasreadinganewspaperwhenInoticedaphotoofayoungwomanwholookedverymuchlikeLindaandwhoselastnamewasWagman﹣Linda'smarriedname.TheremustbethousandsofWagmansIthoughtbutJstillwrotetoher. Shecalledassoonasshegotmyletter.MrsTobin!shesaidexcitedlyLindaEvansWagmanismymother. MinuteslaterIheardavoicethatIknewverymuchevenafter40yearslaughedandcriedandcaughtuponeachother'slives.Nowtheemptyplaceinmyheartisfilled.Andthere'sonethingthatLindaandIknowforsure:Wewon'tloseeachotheragain! 1ThewriterwenttopianolessonswithLindaEvans. A.attheageof13 B.beforeshegotmarried C.aftertheymovedtonewhomes D.beforethewriter'sfamilymovedaway 2Theydidn'toftenwritetoeachotherbecausethey. A.gotmarried B.hadlittletimetodoso C.didn'tlikewritingletters D.couldseeeachotheronspecialtime 3Therewasanemptyplaceinthewriter'sheartbecauseshe. A.wasintrouble B.didn'tknowLinda'saddress C.receivedthecardthatshesent D.didn'thaveafriendlikeLindatoshareherhappinessorsadness 4Thewriterwashappywhenshe. A.readthenewspaper B.heardLinda'svoiceonthephone C.metayoungwomanwholookedalotlikeLinda D.wrotetothewomanwhoselastnamewasWagman 5Theyhaven'tkeptintouch. A.forabout40years B.forabout27years C.sincetheygotmarried D.sincethewriter'sfamilymovedaway
15分JiaoziChineseDumplingisatraditionalChineseFood1isessential必不可少duringholidaysinNorthernChina.ChinesedumplingbecomesoneofthemostwidelylovedfoodsinChina.Therearemany2reason. Chinesedumplingisoneofthe3foodsinChineseNewYear.SincetheshapeofChinesedumplingissimilar4ancientChinesegoldorsilveringots铸锭theysymbolizewealthTraditionallythemembersofafamilygettogether5makedumplingsduringtheNewYear'sEve.Theymayhideacoininoneofthedumplings.Thepersonwho6findthecoinwilllikelytohaveagoodfortuneintheNewYear.ChinesedumplingisalsopopularinotherChineseholidaysorfestivalssoitispartoftheChinesecultureortradition. Chinesedumplingisadeliciousfood.Youcanmake7varietyofChinesedumplingsusingdifferentfillings8baseonyourtasteandhowvariousingredients烹调的原料aremixedtogetherbyyou. 9makedumplingsisreallyteamwork10usualallfamilymemberswilljointhework.SomepeoplestarttomakedumplingwhentheywerekidsinthefamilysomostChineseknowhowtomakedumplings.
8分Mistakesareapartoflife.Toerrishuman.Failureisalsoapartoflifenottheendoflife.Behappyfacinglife'schallenges.Whenyoumaketheefforttobehappyandtoimproveyourlifeyouareactuallyrewardedalongtheway. Lifeislikeagameandmaybeyoucanawardpointsforeveryeffortthathasbeenasuccessforyou.Tryit.Addtenpointsforeveryachievement.Andwhenyouhavereached50pointsjustyellHeyI'vewon!andgiveyourselfareward.IfyouhappentohavemissedyourpointsforwhateverreasontellyourselfWellItried!whichisbetterthannottryingatall.Don'tletitbesaidyoudidn'ttry. Whatisitthatyouwanttomakeyourselfhappy?Actuallyhappinessmeansdifferentthingstodifferentpeople.Forexampleanathletewillbehappywinninghisfirstrace.Foranewmotherhappinesswouldbeseeingherbaby'sfirststeps.Happinessforapoorpersonwouldmeanhavingamealjustfortoday.Sohappinessforyouisreallysomethingsimplethatyouwantforyourself. Itreallydoesn'thavetobebig.Asamatteroffactyoushouldbealwaysrealistic现实的.Makethebestoutofeverygivensituation.Ifyouexpectacertainresultfromasituationanditdoesnothappendon'tgetdespondent.Thisjustmeanstryinghardernexttime.Weallhaveinusthepowertosucceed.Don'tletgiveupbeapartofyourvocabulary. 1BysayingToerrishumantheauthormeansthat. A.humanbeingsshouldtrytoavoidmakingmistakes B.nooneisperfectandeveryonemakesmistakes C.mistakesandfailuresmakeupourlife D.humanbeingsmakemistakeseasily 2What'sthemainideaofParagraph2? A.Trytoreach50points. B.Neverstoptryinginyourlife. C.Awardyourselfforyoursuccess D.Don'tbeafraidofmissingyourpoints. 3TheauthorproveshisideainParagraph3through. A.examples B.numbers C.experiments D.stories 4Theunderlinedworddespondentinthelastparagraphmeans. A.frightened B.disappointed C.surprised D.excited
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