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如图是氯化钾和硝酸钾的溶解度曲线.(1)氯化钾溶液中的溶剂是 .(2)硝酸钾饱和溶液中混有少量氯化钾,提纯硝酸钾应采用的方法是 .(3)要使氯化钾饱和溶液变为不饱和溶液,除加水之外的方法是 ...
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已知硝酸钾在水中的溶解度受温度影响比氯化钾大如图是硝酸钾和氯化钾两种物质在水中的溶解度曲线图.试回答
硝酸钾和氯化钾的溶解度曲线如下图所示:1t1℃时硝酸钾的溶解度为________2t1℃时将50g硝
硝酸钾和氯化钾的溶解度曲线如图4所示下列叙述正确的是
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t ℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60 ℃时,100 g水中加入90 g硝酸钾,充分搅拌,可得到硝酸钾的饱和溶液
如图是硝酸钾和氯化钾固体的溶解度曲线第8题图1t1℃时硝酸钾的溶解度________填大于等于或小于
10℃时在两个烧杯中分别盛有相同质量的硝酸钾和氯化钾饱和溶液保持溶液温度不变分别向其中加入等质量的相
硝酸钾和氯化钾的溶解度曲线如图所示下列叙述正确的是
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t ℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60 ℃时,100 g水中加入90 g硝酸钾,充分搅拌,可得到硝酸钾的饱和溶液
硝酸钾和氯化钾的溶解度曲线如图所示下列叙述正确的是【】
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t ℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60 ℃时,100 g水中加入90 g硝酸钾,充分搅拌,可得到硝酸钾的饱和溶液
硝酸钾和氯化钾的溶解度曲线如图所示下列叙述正确的是
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t ℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60 ℃时,100 g水中加入90 g硝酸钾,充分搅拌,可得到硝酸钾的饱和溶液
硝酸钾和氯化钾的溶解度曲线如图所示下列叙述正确的是
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t ℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60 ℃时,100 g水中加入90 g硝酸钾,充分搅拌,可得到硝酸钾的 饱和溶液
已知氯化钾硝酸钾在不同温度时的溶解度如下表依据如表数据和溶解度曲线判断下列说法错误的是
能表示硝酸钾和氯化钾的溶解度曲线分别是甲和乙
t
1
℃时,氯化钾和硝酸钾的溶解度相等,在34.0 g至35.0 g之间
t
2
℃时,将接近饱和的丙物质的溶液升高温度,可使其变成饱和溶液
氯化钾中混有少量的硝酸钾,可采用降温结晶的方法提纯
硝酸钾和氯化钾的溶解度曲线如图4所示下列叙述正确的是
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t ℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60 ℃时,100 g水中加入90 g硝酸钾,充分搅拌,可得到硝酸钾的饱和溶液
如图为硝酸钾和氯化钾的溶解度曲线图请回答1t℃时硝酸钾的溶解度填>=或<氯化钾的溶解度.260℃时把
硝酸钾和氯化钾的溶解度曲线如右图所示下列叙述正确的是
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t ℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60 ℃时,100 g水溶解90 g硝酸钾,所得硝酸钾溶液的溶质质量分数为90%
右图是硝酸钾和氯化钾的溶解度曲线1两种物质中溶解度受温度影响较小的是2t2℃时硝酸钾的溶解度填>=<
下列说法正确的是
20℃时氯化钾的溶解度是34g,则20℃时氯化钾溶液中溶质.溶液的质量比为34:100
20℃时氯化钾的溶解度是34g,则20℃时氯化钾溶液中溶质.溶剂的质量比为34:100
27%的硝酸钾溶液中溶质.溶剂的质量比为27:100
27%的硝酸钾溶液中溶质.溶液的质量比为27:100
硝酸钾和氯化钾的溶解度曲线如图4所示下列叙述正确的是
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t ℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60 ℃时,100 g水中加入90 g硝酸钾,充分搅拌,可得到硝酸钾的饱和溶液
硝酸钾和氯化钾的溶解度曲线如图所示下列叙述正确的是
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t ℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60 ℃时,100 g水中加入90 g硝酸钾,充分搅拌,可得到硝酸钾的饱和溶液
硝酸钾和氯化钾的溶解度曲线如下图所示下列叙述正确的是
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t ℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60 ℃时,100 g水中加入90 g硝酸钾,充分搅拌,可得到硝酸钾的饱和溶液
硝酸钾和氯化钾的溶解度曲线如图所示下列叙述正确的是
硝酸钾的溶解度一定大于氯化钾的溶解度
降低温度可使接近饱和的硝酸钾溶液变饱和
t℃时,硝酸钾和氯化钾两种溶液的溶质质量分数一定相等
60℃时,100g水中加入90g硝酸钾,充分搅拌, 可得到硝酸钾的饱和溶液
10℃时在两个烧杯中分别盛有相同质量的硝酸钾和氯化钾饱和溶液保持溶液温度不变分别向其中加入等质量的相
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25分假如你是李华上周在外教Mr.Jackson的口语课上使用手机被老师发现手机被收走.请给外教写一封道歉信内容应包括以下要点 1.表示歉意 2.解释上课使用手机的原因 3.提出自己的请求并适当表态. 注意1.可适当添加细节使文章连贯字数100左右 2.信的开头和结尾已给出不计入总词数. DearMr.Jackson Yourssincerely LiHua.
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已知集合A={﹣12}B={x|ax=1}若B⊆A则由实数a的所有可能的取值组成的集合为
如图是在某学校举行的运动会上七位评委为某体操项目打出的分数的茎叶图去掉一个最高分和一个最低分后所剩数据的方差为.
已知定义在R上的奇函数fx满足fx+2=﹣fx当0≤x≤1时fx=x2则f1+f2+f3+…+f2019=
函数fx的定义域为D若fx满足在D内是单调函数且存在[mn]⊆D使fx在[mn]上的值域为[]那么就称y=fx为“半保值函数”若函数fx=logaax+ta>0且a≠1是“半保值函数”则正实数t的取值范围是
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设=﹣11=43=5﹣2. 1若+t∥求实数t的值 2若+t⊥求实数t的值.
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设函数fx=x+1ex+1则
要完成下列两项调查①从某社区125户高收入家庭280户中等收入家庭95户低收入家庭中选出100户调查社会购买力的某项指标②从某中学的15名艺术特长生中选出3人调查学习负担情况宜采用的抽样方法依次为
已知定义在R上的函数fx满足f﹣x=fx且函数fx在﹣∞0上是减函数若a=f﹣1b=flog2c=f20.3则abc的大小关系为
30分If1ranmybusinessthewayyoupeopleoperateyourschoolsIwouldn'tbeinbusinessverylong!Isaidbeforeagroupofangry41Irepresentedagroupofbusinesspeoplewhowantedto42publicschools.Iwasamanageratanicecreamcompanythatbecame43whenPeoplemagazinechoseourblueberry蓝莓astheBestIceCreaminAmerica. AssoonasI44awomanraisedherhand.Tomysurprisesheappeared45andpleasant.Wearetoldsirthatyou46acompanythatmakesgoodicecream. Ireplied47BesticecreaminAmericaMa'amSirshesaid48youarestandingonyourreceivingdock码头andyouseeaninferior质量差的shipmentofblueberries49whatdoyoudo? ImmediatelyIknewthequestionwasatrapbutIwasn'tgoingto50. Isendthemback. That'sright!sheraisedhervoiceandwecan51sendbackourblueberries.Wetakethembigsmallrichpoorgiftedconfidenthomelessrudeandbrilliant.Wetakethemall!Andthatsiriswhyit'snotan52.It'sschool! Inanexplosionall290teachersjumpedtotheirfeetand53Yeah!Blueberries!Blueberries! Andsobeganmylong54. SincethenIhavevisitedhundredsof55Ihavelearnedthataschoolisnotabusiness.Foronethingareunableto56thequalityoftheirrawmaterial. Yetitdoesn'tdenythe57forchange.Wemustchangehowweteachtogiveallchildrentheopportunitytobecome58.Buteducatorscannotdothis59thesechangescanoccuronlywiththeunderstandingtrustpermissionandactivesupportofthewholesociety.60toimprovepubliceducationmeansmorethanchangingourschoolsitmeanschangingthewholecountry. 41.A.workers B.teachers C.parents D.leaders 42.A.replace B.challenge C.influence D.improve 43.A.rich B.Special C.famous D.busy 44.A.continued B.asked C.finished D.criticized 45.A.polite B.shy C.confident D.honest 46.A.manage B.establish C.buy D.help 47.A.happily B.carefully C.eagerly D.proudly 48.A.when B.because C.although D.until 49.A.leave B.arrive C.disappear D.move 50.A.lie B.stop C.admit D.follow 51.A.ever B.never C.also D.just 52.A.blueberry B.icecream C.business D.receivingdock 53.A.reported B.warned C.doubted D.yelled 54.A.transformation B.research C.explanation D.study 55.A.schools B.companies C.countries D.groups 56.A.change B.notice C.examine D.control 57.A.method B.need C.possibility D.reason 58.A.peaceful B.successful C.thankful D.powerful 59.A﹣silently B.secretly C.alone D.again 60.A.Moreover B.Besides C.However D.Therefore
如图所示样本A和B分别取自两个不同的总体它们的样本平均数分别为样本标准差分别为SASB则
如图所示函数y=2cosωx+θx∈Rω>00≤θ≤的图象与y轴交于点0且该函数的最小正周期是π. 1求θ和ω的值. 2已知点A0点P是该函数图象上一点点Qx0y0是PA的中点当y0=x0∈[π]时求x0的值.
下列函数中最小正周期为π的是
8分Therehasbeenatechnologicalrevolutionwherekindlese﹣booksandvariousonlinereadingappshavetakenovertheworld.Isreadingaprinthookoutofdate?Wellnotexactly. Therearesomanywonderfulfactorsinvolvedwithreadingaprintcopyofthebook.IremembertheexcitementofgoingtothebookstorewithmymomwhenIwasinelementaryschool.ThefeelofsittingdowninthehookstoreandselectingthebooksIwantedtoreadwasjustsomuchfun!Ithinkthatreadingpaperbackbookshasitsowncharmandexcitementthatcannotbereplacedbyanelectronicbook.Holdingthephysicalcopyofthebookinmyhandsandturningovereachpagemakesthereadingexperiencesomuchmorerealandmemorable. Admittedlye﹣booksseemtobemoreconvenientthanprintbooks.Purchasingane﹣bookcantakeplaceinsecondsandthesebooksareoftenpricedlessexpensivelythanprintcopybooks.Withe﹣bookstheremostlikelyisn'tgoingtobeastorageproblemunlessthedevicehasalimitonhowmanybookscanbepurchased.Thenagaininordertoreade﹣booksonemusthaveaparticulardevice﹣tabletiPadKindleorlaptoptoreaditon.Thusanadditionalpaymenthastohemadeinordertoreade﹣bookswhereasreadingprintcopiesdoesnotinvolveanyextradevice. Printbooksneveractuallystoppedleadingthechargeconsideringthate﹣booksaleshavenevermadeupmorethanathirdofallbooksales.Andalthoughtheyrosetothatnumberextremelyquickly﹣AmazononlyintroducedtheKindlein2007﹣themajorityofallhookssoldhasalwaysbeenprint.Therealityisthatthereisabsolutelynoreasonprintande﹣bookscan'tcoexistinthebookmarketbutprinthooksmaycarrytheday. 12.Whatpleasuredoestheauthorhavewhenhereadsprintcopybooks? A.Hedoesn'thavetobuyatabletoriPad. B.Hecangethomeandstayonthecouchtoenjoyreading. C.Hecanenjoyfillinghisshelfwithbooks. D.Hecansitdowninthebookshopandreadwhathelikes. 13.Whatadvantagedoe﹣bookshaveaccordingtothepassage? A.Thereadingexperienceismorereal. B.Thereisnostorageproblematall. C.Purchasingthemtakeslesstime. D.Theyareverypriceless. 14.Whatcanweinferaboutthebookmarket? A.E﹣booksalesmakeupmorethan1/3ofit. B.E﹣booksaleshaveneversurpassedprintbooksales. C.Amazonoccupiesmostofthemarket. D.Printbooksande﹣bookscan'tcoexist. 15.Whatcanbeasuitabletitleforthetext? A.PrintBooksMayOutlastE﹣Books B.BooksChangewiththeTechnology C.E﹣booksAreMoreConvenientthanPrintBooks D.TechnologicalRevolutionisCreatingaReadingRevolution.
10分假定英语课上老师要求同桌之间交换修改短文请你修改你同桌写的以下作文文中共存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^并在其下而写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下面画一横线并在其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10处多者从第11处起不计分. Mymathteacherisusedtotakeoffhisovercoatassoonashecomesintotheclassroom.Afterthathewillasksomeoneansweraquestion.Insteadofgivingtheanswerheletussolvetheproblemonhisown.Healwaysexplainsthemethodclearandintroducesmanyapproachtoworkingouttheproblem.Atfirstourclassmathperformancewasbadthanthatoftheotherclass. Howeverwithhishelpwehadovertakenthem.Inadditionhealwayskeepshisword.Heusedtopromiseusasifwecouldperformwellhewouldbuyusadrink.Asaresultweachievedourgoalsandhedidwhichhesaid.
甲乙丙三人随机排成一排乙站在中间的概率是
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短文.短文中共有10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10处多者从第11处起不计分. Everyyearmyschoolholdsthesummercamp.I'dlovetakepartinthisactivitysomuchbecauseIcanhavealotoffunswithmyfriends.Lastyearwegotocountryfarmthatweexperiencedadifferentlife.IwassoimpressedbytheclearriveandHueskythere.Theywokeupearlyinthemorningandthenwalkedinthecountryroadtogether.Thecountrysideweresoquietandtheairwassofresh.Ifeltrealpeacefulinmymind.BecauselifetherewassimplesoIlikeditverymuch.Iwassoclosetothenatureandcouldappreciateitsbeauty.
10分ThereisanoldSpanishProverbwhichstatesTomorrowisoftenthebusiestdayoftheweek.1I'dsaytoomany.Ourdreamsshouldnotandcannotwait.Wehavetogoforthemnow!Here'swhy. 1.2 Nobodylikestotalkaboutdeathbuttherealityis﹣everybodyisgoingtodieatonepoint.Noneofusknowthedayorthehour.Thereforetodayisallwehave.Don'tgotoyourgravewithunfulfilleddreams.Makethedecisiontogoaftereverydreambigorsmallrightnow. 2.Theworldiswaitingonyourgift IknowthismaybehardtobelievebuttheworldiswaitingonYOU!YesYOU!3Sureotherpeoplemaybeabletosing.Butthey'llneverbeabletosingexactlylikeyou.Sureotherpeoplecanwritebutthey'llneverbeabletowritefromthesameperspectiveinwhichyouwrite.Don'tdeprivetheworldofyourgift. It'stheoxygenthatweneedtosurvive.Thusitisyourresponsibilitytofigureoutexactlywhatyourgiftisandusetobetteryourlifeandthelivesofthosearoundyou. 3.4 YoucandreamaboutwritingthegreatAmericanplaythatyouwantbutit'snevergoingtohappenunlessyouactuallyputpentopaper.Youcandreamaboutfindingacureforcancerbutitwillneverhappenunlessyouactuallygotoschooltobecomeequippedwiththenecessarytoolstofindthatcure.5Theyrequireyoutogetyourheadoutofthecloudsandactuallydotheworktomakethemhappen.Gettoit! A.Youcan'tletfearwin. B.Tomorrowisnotpromised. C.Inotherwordsdreamsdon'tworkunlessyoudo. D.Possibilitiesyouneverknewexistedarewaitingonyou E.Howmanytimeshaveweputoffourdreamsuntiltomorrow? F.Unlessyoutakethefirststepyourdreamswillnevercometrue. G.Youwerebornintotheworldwithauniquegiftwhichnobodyonthisearthcancopy.
已知函数若实数m∈01则函数gx=fx﹣m的零点个数为
已知扇形的圆心角为rad半径为6cm则扇形的弧长为cm.
设D为△ABC所在平面内一点则
8分WhenviewedfromtheSchuylkillExpresswayinPhiladelphiaSt.John'sChurchpresentsapictureofdignityandgrace.Thisgray﹣stonedbeautysurroundedbyaparkmadeawonderfulsettingfortheweddingmywifeandIattendedinManayunk. AtthechurchIranintoanoldfriend?CasperBarratawhohappenedtobeassignedtotheMass弥撒.Now73Casperwasabrilliantandtalentedsoftballpitcher投手backintheMen'sLeaguesofPhiladelphiainthemid﹣60s.Ididn'trecognizethenowsilver﹣hairedfellowuntilmybrother﹣in﹣lawJohnKaymentionedhisnametome!AfteraverypleasantgreetingandpraisingeachotheronhowgoodtheotherwasatplayingthegamebackthenCasperaskedifIrememberedaletterofencouragementIhadwrittentohimbackin1964.ItappearedthatCasperfellonhardtimespitchingaspitcherssometimesdoandhewasn'1pitchingtoowellforaperiodoftime.Ididn'trecalltheletterbuthesaidYesIstillhaveitandIcontinuetoreaditanytimethingsaren'tgoingtoowell.Hewentontosaythathehadreadthelettermanytimesoverthepast40yearsandthesituationalwaysseemedtoimprove.Iwasspeechless! HecontinuedYoudon'tremember?IsaidSadlynoIdon't.ButIdidaskifIcouldhaveacopyoftheletter.Hesaidhewouldemailittome.AfterCasperfinishedworkatMurphy'sweddingwemetonthestepsofthechurch.Caspercameuptomeandpresentedtheletter.HelivedablockawayfromthechurchandranhometogetitaftertheMass.Theenvelopehadfadedandturnedyellowandsowastheletterinside.Thatletterhadtobenearly50yearsold.Insimpletermstheletterread ThesehardtimesaretemporaryMaintainyourpassionforthegame.Neverquitandyou911bebackontopagainshortly.Hanginthere! CasperBarrataonceagainbecamethebestpitcherintheLeagueandremainedtobeathorninourteam'ssideeverytimehepitchedagainstus. 25.Whydidtheauthorgotothechurch? A.Togetmarried. B.Toholdawedding. C.Toattendawedding. D.TomeethisfriendCasperBarrata. 26.Whatcanbeinferredfromthetext? A.Theauthoroncefellonhardtimespitching. B.TheauthoronceoftenworkedfortheMass. C.Theauthoroncewasgoodatplayingsoftball. D.TheauthoroncetaughtCaspertoplaysoftball. 27.WhatdoestheunderlinedsentenceshowinParagraph2? A.TheauthorwasmovedbyCasper. B.Theauthorwasn'tgoodatspeaking. C.TheauthoradmiredCaspertoomuch. D.Theauthordidn'trecalltheletteratall. 28.WhydidCasperkeeptheletterfordecades? A.Theletterwassentbyhisbestfriend. B.Theletterinspiredhiminhissportcareer. C.Theletterwaswrittenbyasoftballpitcher. D.Theletterhelpedhimrecallsomethinginthepast.
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