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CaF2、CaC2都是工业生产的重要物质.回答下列问题: (1)基态钙原子的电子排布式 ,钙原子核外有 种能量状态的电子. (2)CaC2与水反应生成乙炔(C2H2),乙炔中碳原子的杂化...
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高三下学期化学《》真题及答案
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加入任何能降低炉渣熔点的物质都能改善炉渣的流动性如CaF2MnOFeO等均可改善流动性
下列都是第一次工业革命的重要发明其中使工业生产冲破自然条件的限制大大加速了工业生产进程的重要发明是
珍妮纺纱机
水力纺纱机
蒸汽机
蒸汽机车
下列各组物质中所有化学键都是共价键的是
H2S和Na2O2
H2O2和CaF2
NH3和N2
HNO3和NaCl
CaF2的溶度积的表达式KSP
焊剂431的第二位数字3表示焊剂中二氧化硅氟化钙的平均含量为
SiO2<10%,CAF2<10%
SiO2>10%,CAF2>10%
SiO2<10%,CAF2>30%
SiO2>30%,CAF2<10%
石灰的化学符号是CaF2
下图为CaF2H3BO3层状结构层内的H3BO3分子通过氢键结合金属铜三种晶体的结构示意图请回答下列
电石的分子式CaC2工业品呈
紫色
白色
灰白色
灰色
电石可发生下列分解反应CaC2=
CaF2具有直接脱硫作用
萤石的主要成分是CaF2
含CaC2为的渣为强电石渣冷却后呈黑色
电石的导电性随CaC2含量高低而变化当CaC2时电石的 导电性随CaC2含量的增加而增强
>65%
>50%
>55%
>60%
电石的导电性随CaC2含量高低而变化当CaC2时电石的导电性随CaC2含量的增加 而增强
>45%
>50%
>65%
>55%
[化学---物质结构与性质]氟在自然界中常以CaF2的形式存在1下列关于CaF2的表述正确的是___
电石的熔点随电石中CaC2含量而改变纯CaC2熔点为
2000℃
2300℃
2100℃
2200℃
炉外脱S能力CaO>CaC2>Mg
金属钾的冶炼方法2KF+CaC2CaF2+2K↑+2C下列说法正确的是
该反应的氧化剂是KF,氧化产物是K
该反应能说明
的还原性大于K. C.不能用电解KF溶液来制备金属钾
CaC2和CaF2中阴阳离子个数比均2:1
常温下下列物质能与水反应生成气体且该气体是电解质的是
NaH
Mg3N2
Al2S3
CaC2
炉渣组成为CaO50~55%SiO215%~20%FeO<0.5%MgO<10%Al2O32~3%C
氧化渣
电石渣
白渣
黄渣
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Noonelikestofail.Whetherit'satworkathomeorinanotherareaofyourlifefailureispainfulanditcanalsobecostlyintermsoftimemoneyorboth.1Ifyouneversufferafailurethenyou'reprobablynotpushingyourselftoyourfullpotential.Thefollowingaresometipsonhowtopickyourselfupafteryou'vefailed. Rememberthatotherpeoplefailtoo.2They'lltellyouaboutthatgreatnewcontract合同theysignednotthedealthatfailedeventuallythoughtheyworkedonitformonths.Butfailureisnormalandlotsofpeoplefailtimeandtimeagainbeforemeetingwithsuccess. Remindyourselfofyourpastsuccesses.Failingdoesn'tmeanthatyou'reworthlessorthatyou'llneverachievethethingsyouwant.3Maybeyouhadhighmarkslasttermoryoulostweightoryoulearnedtoplayamusicalinstrument.Youmightwanttowritedownalistofsuccesses﹣﹣﹣thingsthatyou'veaccomplishedoverthepastfewyearswhetherbigorsmall.Ifyoueverlackconfidenceyoucangobackandreadoverthatlist. 4Yourpastsuccessesareimportantbutsoareyourpastfailures.You'vemademistakesbeforeandyou'vesurvivedthem.Perhapsyoudidbadlyinanexamorlostyourtemperandhadtoapologize.It'snotfuntothinkaboutthetimeswhenthingswentwrongbutbyacknowledgingyourfailuresyoucanremindyourselfthattodayisnodifferent.Justasyourecoveredinthepastyoucanrecoverfromyourrecentfailuretoo. 5Whatevergoeswrongyou'reprobablyfacingsomesortofdecision.Don'trushintomakingahastydecisionbutdolookforaforwardpath.Thatmightrequiresomedeepthinking. A.Makeadecision. B.Limitthedamagecaused. C.Remindyourselfofyourpastfailures. D.Howeverfailureisanormalpartoflife. E.Getsomeadviceandsupportfromothers. F.Mostpeopledon'ttalkopenlyabouttheirfailures. G.Thinkofallthetimesinthepastwhenyou'vesucceeded.
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EarlyinhislifeDegasbegantohaveproblemseyesight.
Teachers'Dayisinterestinglynotcelebratedonthesamedayallovertheworld.Insomecountriesitismarkedbyaholidayinothersitisaworkingday. InternationalTeachers'DayiscelebratedonOctober5.Beingheldeversince1994itisinhonorofteachers'organizationsworldwide.Itsaimistoencouragesupportsforteachersandtomeettheneedsofstudents. China﹣In1939Teachers'DaywassetforAugust27Confucius'birthday.In1951thecelebrationwasstopped.Howeveritwasfoundedagainin1985andthedaywaschangedtoSeptember10. India﹣Teachers'DayiscelebratedonSeptember5inhonourofDr.SarvepalliRadhakrishnanthesecondpresidentofIndiawhosebirthdayfallsonthatday. Russia﹣InRussiaTeachers'DaywascelebratedonthefirstSundayofOctoberbetween1965and1994.Since1994thedayisobservedontheOctober5justthesamedayasWorldTeachersDay. TheUS﹣IntheUSTeachers'Dayisnon﹣officialholiday.ItiscelebratedontheTuesdayofthefirstfullweekofMay.Anumberofactivitiesareorganizedinschoolstohonorteachers.ThecelebrationscancontinueforthewholeweekofMay. Thailand﹣InThailandNationalTeachers'DayiscelebratedeveryyearonJanuary16.ThefirstTeachers'Daywasheldin1957.Thedayisaholidayinschools. 1Whichofthefollowinghasthesamemeaningastheunderlinedwordobserved? A.stopped B.held C.celebrated D.fell 2Whichofthefollowingispossiblytrue? A.ChinahascelebratedTeachers'Daysincetheyear1931. B.DrSarvepalliRadhakrishnan'sbirthdayisinSeptember C.Teachers'DayisanofficialholidayintheUnitedStates. D.Teachers'DayisaworkingdayinschoolsofThailand. 3Fromthepassagewecanlearnthat. A.ThefirstTeachers'Daywasheldin1965inThailand B.Teachers'DayfallsonConfucius'birthdayinChina C.InternationalTeachers'Dayaimstobenefitthestudents D.AlotofactivitiesareheldonTeachers'Dayacrosstheworld
Thewinterafter9.11wasreallyadifficultoneforme.Ihadjust1thejobinGreenvilleSouthCarolinaandstartedmylong﹣termunemploymentandatmidlifemanyendless2days.Ifeltemptyinside.Onethingthatmademe3washavingmygrandchildrenSophieandSimeonwithmeforHanukkah光明节butwhenthey4totheirhomeIwasleftwithadarkstateofmindandthatinner5again. ItwasthenthatmywifeLindadirectoroftheupstateHomelessCoalition6thatIpretendtobeSantafor30childreninaholiday7atalocalhall.AsshedescribedtomehowmeaningfulitwouldbeIlookedatmyselfinthemirror8thatIhadafullalmostwhitebeardjustlikeSanta's. CanI9Santa?Imustadmitthatyearmyheartwasn'tinit.Theshowmust10.Lindainsisted.Well11thatIhadnothingtodothenIbeganto12myvoiceandactioninordertobelikearealSanta. Iwasnotpreparedforthe30setsofeyesthat13mewhenIwalkedin.Santa!Santa!Lookatmynewshoes!Santa!I'vebeenacutegirl.Santa!Canwe14JingleBellstogether? Theycircledaroundmehuggedand15me.EachchildsatinmylapandposedforaphotoandIgavethemall16﹣ateddybearadollapaint﹣by﹣the﹣numberskitandmanyotherthings. Their17andexcitedvoicesbroughttearstomyeyes.Ifeltawaveof18.Thesechildrenweremostvaluablegiftstoacoldworld.These19childrenliftedmefromself﹣doubtandhopelessness.AtthatsweetmomentIlostmymindandregainedmy20. 1A.employed B.left C.found D.created 2A.special B.ordinary C.depressing D.interesting 3A.happy B.amazed C.surprised D.worried 4A.referred B.turned C.applied D.returned 5A.peace B.emptiness C.doubt D.pity 6A.promised B.agreed C.suggested D.believed 7A.training B.plan C.movie D.program 8A.discovering B.hoping C.wishing D.imagining 9A.regardas B.serveas C.viewas D.actas 10A.takeoff B.goon C.breakdown D.speedup 11A.guessing B.remembering C.considering D.supposing 12A.practice B.examine C.change D.observe 13A.leftbehind B.focusedon C.tookin D.pointedat 14A.play B.write C.sing D.strike 15A.kissed B.comforted C.encouraged D.inspired 16A.presents B.chances C.smiles D.signs 17A.anger B.anxiety C.breath D.delight 18A.concern B.warmth C.regret D.sadness 19A.homeless B.clever C.disabled D.healthy 20A.friendship B.strength C.freedom D.hope
I'mnotinahurry.SoIdon'tmindwaitforanotherfifteenminutes..
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