问题详情:.HA和HB两种*的溶液分别加水稀释时,pH变化的简图如图所示,下列叙述中不正确 的是( ) A.HA是一种强* B.x点,c(A-)=c(B-) C.HB是一种弱* D.原溶液中HA的物质的量浓度为HB的10倍【回答】...
2021-08-16 8763
问题详情:(1)25。C时,0.1mol/L的HA溶液中c(H+)/c(OH-)=1010.请回答下列问题:①HA是__________(填“强电解质”或“弱电解质”)。②在加水稀释HA溶液的过程中,随着水量的增加而增大的是_________(填字母)。A.c(H+)/c(HA) B.c(HA) /(A-)C.c(H+)与c...
2020-06-06 28074
1、Tohumandhanone'swords2、Thedriver'shandbegantojumpagain.Formysafety,Ihadtohumandhawafewwordstohangupthephone....
2023-12-27 9140
问题详情:已知25℃HB电离常数K=4×10-7。H2A===H++HA-,HA-H++A-(K=3×10-6);有关0.1mol·L-1的两种*H2A、HB溶液,下列说法不正确的是()A.分别取等体积的两种*溶液稀释100倍后,pH(H2A)<pH(HB)B.NaHA溶液一定显**C.两种*中和等量NaOH,消耗两种*的体积2V(H2A)=V(HB)D.过量的H2A溶液加入到NaB溶液中...
2020-04-24 16108
问题详情:---YoudohavethebookI’vebeenlookingforwardto?---Ha,sure.I____ifIdidn’t.A.wouldneverhavecalled B.hadn’tcalled C.won’tcall D.wouldn’tbecalling【回答】D知识点:虚拟语气与情...
2021-07-05 32996
Younger-skewingartists,suchassinger-rapperKe$ha,enjoyalargersliceofthedigitalpiethanolder-skewingartistssuchasJamesTaylor,hesays."TillTheWorldEnds"writer,Ke$ha,wantstocelebratethesong'srecentsuccessbyhavingapartyandstripdownwithBritney.吸引低年龄...
2018-10-23 22739
问题详情: 已知NaHA溶液显**,溶液中存在以下平衡: ①HA- +H2OH2A+OH-②HA-H++A2- 向0.1 mol·L-1的NaHA溶液中分别加入以下物质,下列有关说法正确的是() A.加入等物质的量的Na2A固体,则2c(OH-)=2c(H+)+c(HA- )+3c(H2A)-c(A2-) B.加入少...
2021-02-02 26831
问题详情:____you____thebook?A.Are;haveB.Have;gotC.Do;getD.Are;having【回答】C知识点:动词时态题型:选择题...
2020-10-22 26229
问题详情:(Ⅰ)某二元*(H2A)在水中的电离方程式是:H2A===H++HA-,HA-H++A2-。(1)Na2A溶液显________(填“**”、“中*”或“碱*”)。理由是________________________________________________________________________(用离子方程式表示)。(2)已知0.1mol/LNaHA溶液的pH=2,则0.1mol/LH2A...
2022-08-08 15115
问题详情:TheleadersofDenmarkandFinlandsaidon Fridaythat China hasshoweda willingness to __________ global efforts to bail out debt-ridden European countries. A.contributeto B.subscribeto C.appealto...
2019-12-13 23545
问题详情:accountfor,dependon,teamup,settledown,takeon,confirm,haveagiftfor,getawaywith1. Asateacher,shecan’thaveanystudents______________________cheatingintheexam.2. Chinahasapopulationof1.4billion,withtheaged_______________________...
2019-10-03 5955
问题详情:某二元*H2A在水中的电离方程式是H2A=H++HA﹣,HA﹣H++A2﹣.回答下列问题:(1)Na2A溶液显 (填“**”、“中*”或“碱*”),理由是 (用离子方程式或必要的文字说明).(2)常温下,已知0.1mol•L﹣1NaHA溶液pH=2...
2019-09-17 28289
1、Schulmanisalittletiredofthehoo-haabouttheall-womenteam.2、There'sbeensomuchhoo-haoverthelaunchofGoogleChromeIthoughtI'ddoadirectcomparisonwiththepoweruser'sfavourite,Firefox.3、Gotagoodhoo-hahoutofthatstory.4、Butforallthesetechnologicalhoo-has...
2023-12-31 7002
问题详情:—I’mtootired.Iworkedverylatelastnight.—Ithinkyouhaveagoodrest.A.should B.need C.may D.mustn’t【回答】A。考查情态动词的用法。should应该;need需要;may可能;mustn’t禁止。累了应该好好休息一下...
2021-11-03 11898
问题详情:I.H2A在水中存在以下平衡:H2AH++HA-,HA-H++A2-。(1)NaHA溶液显**,则溶液中离子浓度的大小顺序为_____。(2)常温时,若向0.1mol/L的NaHA溶液中逐滴滴加0.1mol/LKOH溶液至溶液呈中*。此时该混合溶液的下列关系中,一定正确的是_____。A.c(Na+)>c(K+) B.c(H+)•c(OH)=1×10-14C...
2020-06-24 18858
让我们首先简要介绍一下高可用*(HA)和RAID,然后再研究DRBD的架构和用法。我首次接触高可用*(HA)是在20世纪80年代,当时在从事商业对地同步通讯卫星方面的工作。...
2022-03-27 12188
问题详情: he asmallnoseorbigone? A.Do,has B.Does,has C.Does,have D.Do,have【回答】D知识点:一般疑问句题型:选择题...
2021-08-06 19027
问题详情:不能*一元*HA为弱*的是( )A.相同条件下HA溶液的导电*弱于盐* B.0.1mol/L的HA溶液pH为3溶液中滴加石蕊显红* 溶液显碱*【回答】C知识点:电离平衡题型:选择题...
2022-01-15 23900
问题详情:Oncyearago,whenI was 15,Ithought I 1 (live)forever.I hadgreatfriendsanddidwellinmystudies.One day afternoon,wegointoChris'carandstarted gotohisbouseanelweplayedvolleyballtogether.Whilewe2(wait)attrafficlights,wetalkedfreelv.Therewerenoo...
2020-11-12 17455
Ha!Didyouseewhattheydidthere?IfyouendupwithaCharlieBrownsituation,withtheentireclassha-ha-ing,that'sadisaster,andpeoplewillloatheyouforit.Clearly,anyhaconfigurationrequiresthatserversaredeployedacrossmultipleanddiscretehardwaresystems.Haistherequire...
2017-10-18 24768
问题详情: Peoplewhoareslightlyoverweightormildlyobese(肥胖的)havealowerriskofearlydeaththannormalweightindividuals(个人;个体),accordingtoanewanalysisofnearly100internationalstudies. Thestudies,mostconductedwithinthepastdecade,includedabo...
2021-09-13 9082
问题详情: Ⅰ.已知H2A在水中存在以下电离:H2A=H++HA- HA-H++A2-。某温度下,若向0.1mol/L的NaHA溶液中逐滴加入0.1mol/LKOH溶液至中*(忽略体积变化),此时该溶液中的下列关系一定正确的是 A. c(OH-)×c(H+)=1.0×10-14 B. c(Na+)+...
2019-05-20 17554
问题详情:Therearevariouskindsofthemeparks.Somearefamous 61 havingthebiggestorlongestrollercoasters,othersfor 62 (show)thefamoussightsandsoundsofculture.Whicheverandwhateveryou 63 (like),thereisathemeparkforyou!Thethemeparkw...
2021-06-22 26323
问题详情:ArockgroupcalledtheRocketCrewisontour.Theiragent(经纪人)hasaskedthetownofficialsaboutWilbourCityonthetour.Thestadiuminthetownislargeenoughtoholdtheexpectedcrowd.TicketsalesintheareawouldbegoodbecauseseveraltownsarearoundWilbourCity.However,ma...
2020-10-25 16690
问题详情:.已知HA为一元*,常温下向20mL0.01mol/L的HA溶液中滴加0.01mol/L的NaOH溶液,测得溶液pH与所加NaOH溶液体积关系如图所示。下列说法不正确的是A.常温下,该*的电离常数K=10−5.6B.该测定过程中不可以选择*基橙为指示剂C.滴定至①处时,溶液中离子浓度关系为:c(A−)>c(Na+)>c(H...
2019-09-19 4978