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化学兴趣小组打算通过实验探究一瓶溶液的成分,该溶液中可能含有氯化钾和氢氧化钾中的一种或两种. (1)伟浩同学提出猜想,该溶液中可能含有碳酸钾,用化学方程式表示猜想的依据 . (2)通过实验探...
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某校化学兴趣小组在实验室中发现一瓶溶液标签上标有CaCl20.1mol·L-1的字样下面是该小组成员
配制1L.该溶液,可将0.1 mol CaCl
2
溶于1L.水中
Ca
2
+
和Cl
-
的物质的量浓度都是0.1 mol·L
-1
从试剂瓶中取该溶液的一半,则所取溶液的物质的量浓度为0.05 mol·L
-1
将该瓶溶液稀释至原体积的两倍,则所得溶液的c(Cl
-
)为0.1 mol·L
-1
某校化学实验室有一瓶标签残缺的过氧化氢溶液如图Z7-12所示该校化学兴趣小组的同学为了测定其溶质质量
某化学兴趣小组欲测定一瓶过氧化氢溶液中溶质的质量分数实验操作及相关数据如图所示1生产氧气的质量___
某化学兴趣小组欲测定一瓶过氧化氢溶液中溶质的质量分数实验操作及相关数据如图所示1生成氧气的质量为__
某中学化学课外实验兴趣小组欲测定一瓶混有氯化钠的苏打中碳酸钠的质量分数从该瓶试剂中取出20克样品放在
某兴趣小组的同学在实验中发现一瓶溶液标签上标有CaCl20.1mol/L的字样下面是该小组成员对溶液
配制1L溶液,可将0.1molCaCl
2
溶于1L水中
Ca
2+
和Cl
-
的物质的量浓度都是0.1mol/L
从试剂瓶中取该溶液的一半,则所取溶液的物质的量浓度为0.05mol/L
将该瓶溶液稀释一倍,则所得溶液的c(Cl
-
)为0.1mol/L
化学兴趣小组打算通过实验探究一瓶溶液的成分该溶液中可能含有氯化钾和氢氧化钾中的一种或两种. 1伟
某校化学兴趣小组在实验室发现了一瓶标签受到腐蚀的溶液如右图他们对该溶液是什么产生了兴趣开始探究这瓶溶
实验室有一瓶无色溶液标签模糊依稀可见SO4.为探究该溶液中是否有硫酸根化学兴趣小组的同学设计以下甲乙
某兴趣小组在实验室里准备常见酸碱盐的性质实验时发现实验台上摆放的药品中有一瓶未盖瓶塞且标签破损的溶液
某校兴趣小组同学准备进行常见酸碱盐的性质实验时发现实验台上摆放的药品中有一装溶液的试剂瓶未盖瓶盖且标
实验室有一瓶无色溶液标签模糊依稀可见SO4.为探究该溶液中是否有硫酸根化学兴趣小组的同学设计以下甲乙
化学兴趣小组的同学在实验室发现一瓶保管不当盛有无色溶液的试剂瓶且标签破损如图其残缺的标签中只剩下Na
某化学兴趣小组欲测定一瓶过氧化氢溶液中溶质的质量分数实验操作及相关数据如图所示1生产氧气的质量___
.某校兴趣小组同学准备进行常见酸碱盐的性质实验时发现实验台上摆放的药品中如图有一瓶溶液的试剂瓶未盖瓶
化学兴趣小组为了探究化学实验室里的一种黑色粉末和一瓶标签破损的无色溶液标签如下图可能是什么物质大胆猜
某校化学兴趣小组在实验中发现一瓶溶液标签上标有CaCl20.1mol·L-1的字样下面是该小组成员对
配制1L.该溶液,可将0.1 mol CaCl
2
溶于1L.水中
Ca
2
+
和Cl
-
的物质的量浓度都是0.1 mol·L
-1
从试剂瓶中取该溶液的一半,则所取溶液的物质的量浓度为0.05 mol·L
-1
将该瓶溶液稀释一倍,则所得溶液的c(Cl
-
)为0.1 mol·L
-1
某化学兴趣小组欲测定一瓶过氧化氢溶液中溶质的质量分数实验操作及相关数据如图所示1生产氧气的质量___
某化学兴趣小组欲测定一瓶过氧化氢溶液中溶质的质量分数实验操作及相关数据如图所示1生产氧气的质量___
某校化学兴趣小组在实验中发现一瓶溶液标签上标有CaCl20.1mol·L.-1的字样下面是该小组成员
配制1L.该溶液,可将0.1 mol CaCl
2
溶于1L.水中
Ca
2
+
和Cl
-
的物质的量浓度都是0.1 mol·L.
-1
从试剂瓶中取该溶液的一半,则所取溶液的物质的量浓度为0.05 mol·L.
-1
将该瓶溶液稀释一倍,则所得溶液的c(Cl
-
)为0.1 mol·L.
-1
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然而事实并非如此.fact .
方程x﹣1x+2=0的解是
25分假定你是李华.近一个世纪以来中国故宫在今年元宵节首次在夜间对公众开放六千张免费门票在网上几分钟内抢购一空.你的外国朋友Jessica很好奇来信想了解相关情况.请给他回信主要介绍以下内容. 1故宫是中国著名的景点之一中国古代皇帝居住在这里长达五个世纪. 2对公众的开放时间通常是上午900﹣下午500.按传统在晚间谢绝任何人入内. 3为了庆祝元宵节宫墙上挂满红色的灯笼还有京剧表演灯光秀等. 注意事项 1字数100字左右 2适当增加情节使行文流畅 3生词故宫TheForbiddenCity元宵节TheSpringLanternFestival抢购snapup DearJessica Iammorethanthrilledtoreceiveryourletter Iamlookingforwardtoyourvisit. Yoursfaithfully LiHua
8分WhilefamousforeignarchitectsareinvitedtoleadthedesignsoflandmarkbuildingsinChinasuchasthenewCCTVtowerandtheNationalCenterforthePerformingArtsmanyexcellentChinesearchitectsaremakinggreateffortstotakethecenterstage. Theireffortshavebeenprovenfruitful.WangShua49﹣year﹣oldChinesearchitectwonthe2012PritzkerArchitecturePrize﹣whichisoftenreferredtoastheNobelPrizeinarchitecture﹣onFebruary28.HeisthefirstChinesecitizentowinthisaward. WangservesasheadoftheArchitectureDepartmentattheChinaAcademyofArtCAA.HisofficeislocatedattheXiangshancampus校园oftheuniversityinHangzhouZhejiangProvince.Manybuildingsonthecampusarehisoriginalcreations. ThestyleofthecampusisquitedifferentfromthatofmostChineseuniversities.Manyvisitorswereamazedbythecomplexarchitecturalspaceandabundantbuildingtypes.Thecurves曲线ofthebuildingsperfectlymatchtheriseandfallofhillsformingauniqueview. Wangcollectedmorethan7millionabandonedbricksofdifferentages.Heaskedtheworkerstousetraditionaltechniquestomakethebricksintowallsroofsandcorridors走廊.ThiscreationattractedalotofattentionthankstoitsmixtureofmodernandtraditionalChineseelements元素. Wang'sworksshowadeepunderstandingofmodernarchitectureandagoodknowledgeoftraditions.ThroughsuchabalancehehadcreatedanewtypeofChinesearchitecturesaidTadaoAndothewinnerofthe1995PritzkerPrize. Wangbelievestraditionsshouldnotbesealedinglassboxesatmuseums.Thatisonlyevidencethattraditionsonceexistedhesaid. ManyChinesepeoplehaveamisunderstandingoftraditions.Theythinktraditionmeansoldthingsfromthepast.Infacttraditionalsoreferstothethingsthathavebeendevelopingandthatarestillbeingcreatedhesaid. TodaymanyChinesepeoplearelearningWesternstylesandtheoriesratherthanfocusingonChinesetraditions.ManypeopletendtotalkabouttraditionswithoutknowingwhattheyreallyaresaidWang. Thestudyoftraditionsshouldbecombinedwithpractice.Otherwisetherecreationoftraditionswouldbeartificialandemptyhesaid. 1Wang'swinningoftheprizemeansthatChinesearchitectsare. A.followingthelatestworldtrend B.gettinginternationalrecognition C.workingharderthaneverbefore D.relyingonforeignarchitects 2WhatimpressedvisitorstotheCAAXiangshancampusmost A.Itshillyenvironment. B.Itslargesize. C.Itsuniquestyle. D.Itsdiversefunctions. 3WhatmadeWang'sarchitecturaldesignasuccess A.Themixtureofdifferentshapes. B.ThebalanceofEastandWest. C.Theuseofpopulartechniques. D.Theharmonyofoldandnew. 4WhatshouldwedoaboutChinesetraditionsaccordingtoWang A.Spreadthemtotheworld. B.Preservethematmuseums. C.Teachtheminuniversities. D.Recreatetheminpractice.
关于x的方程a﹣5x2﹣4x﹣1=0有实数根则a满足.
人们倾向于在贵的餐馆里吃饭.tendtodosth. .
下列符号能够表示2个氮原子的是
Wemustlearntoworkwithpleasureasthewillimprovetheworkefficiency.combine
已知关于x的一元二次方程ax2+bx+1=0. 1当b=a+1时利用根的判别式判断方程根的情况 2若方程有两个相等的实数根写出一组满足条件ab的值并求出此时方程的根.
某快餐店试销某种套餐试销一段时间后发现每份套餐的成本为5元该店每天固定支出费用为600元不含套餐成本.若每份套餐售价不超过10元每天可销售400份若每份套餐售价超过10元每提高1元每天的销售量就减少40份.为了便于结算每份套餐的售价x元取整数用y元表示该店每天的纯收入. 1若每份套餐售价不超过10元. ①试写出y与x的函数关系式 ②若要使该店每天的纯收入不少于800元则每份套餐的售价应不低于多少元 2该店把每份套餐的售价提高到10元以上每天的纯收入能否达到1560元若不能请说明理由若能求出每份套餐的售价应定为多少元时既能保证纯收入又能吸引顾客
一元二次方程x2﹣2x﹣5=0的根的判别式的值是.
下列实验操作正确的是
如图在平面直角坐标系中Rt△ABC的顶点C在第一象限顶点AB的坐标分别为1040∠CAB=90°BC=5.抛物线y=+bx+c与边ACy轴的交点的纵坐标分别为3. 1求抛物线y=+bx+c对应的函数关系式 2若将抛物线y=+bx+c经过平移后的抛物线的顶点是边BC的中点写出平移过程 3若抛物线y=+bx+c平移后得到的抛物线y=+k经过﹣5y13y2两点当y1>y2>k时直接写出h的取值范围.
若将抛物线y=2x2+1向左平移1个单位长度再向下平移2个单位长度则所得抛物线的解析式为
如图在平面直角坐标系中P是抛物线y=﹣x2+3x上一点且在x轴上方过点P分别向x轴y轴作垂线得到矩形PMON若矩形PMON的周长随点P的横坐标m增大而增大则m的取值范围是.
10分Itisnecessaryaswellasimportantthatteenagerslearnhowtosavemoney.Asisknownthemoneyyousavecanbeforrainydaysandbeusedtopaythroughyourcollegeeducation.Ifyouthinkitisahardtaskanddon'tknowhowtodoitpleasedoasthefollowing. 1 Mydadalwaystellsmethatifonedoesn'trespectmoneyitwillneverrespectyou.Thereforeit'simportantthatyoukeeparecordofyourdailyexpenses.Makeitahabittowritedownallthatyouhavespent.Andwhenyoufindoutthetotalexpenseattheendofthemonthyou'llrealizewhatyou'vespentmoremoneyindoing2. Openasavingsaccount Openingasavingsaccountisabetterwaytosavemoney.Youcansetagoalsayforexamplethemoneyisforanewnotebookorforcollegeandthensaveuntilyouhaveenoughmoneytobuyanotebookoruntilyougotocollege.3 Don'tcarrymuchcash DoyouhavethehabitofnotleavingastorewithoutbuyinganythingTheonlywaytostopthatiscarryinglessmoneywithyou.Gotothestorewiththeminimumamountofmoneywhichwillnotevenhelpyoubuyadrink.4. Savethechange Savethechangethatyougetback.Ifyouhavegonetoashoptobuysomethingandgetbacksomechangethendonotspendthem.5.Andyou'llbesurprisedatthehugeamountofmoneyafterdays. Followthesetipsaboveandthusyoucansavealotofmoney.Andsurelythey'llhelpyoubemoreresponsibleinyourlife. A.Keeparecordofyourdailyexpenses. B.Insteadyoucansavetheminyourpiggybank. C.Bythattimeyou'llrealizetheimportanceofsavingmoney. D.Nowadaysinthedevelopedanddevelopingcountriespeopleareallworkingforthesakeofearningmoney. E.Nextmonthyouwillautomaticallytryandsavemoreinthatpart. F.Afterafewdaysyou'llgetridofthishabit. G.Savingmoneybuildsyourfinancialpowerandpersonalfreedom.
1morningWangPengownerofarestaurantfeltvery2andpuzzled.Hisrestaurantwasusually3ofcustomersbutthismorningitwasempty. Thenhe4oneofhisregularcustomerstoa5restaurantcalledYongHui'sslimmingrestaurant.Hefoundtherestaurantonly6rawvegetablesfruitsandwaterinordertomakepeople7.Hehurriedoutfullofdoubt.Hedecidedtodosomeresearch8bothYongHui'smenuandhis9. Soonhediscoveredtheproblem10YongHui'smenu.Itwasn'tgivingitscustomers11foodwhichofcoursewouldcausethecustomerstobecome12veryquickly.Nowheknewhowto13backhiscustomers.He14worryingandstartedadvertisingthe15ofhisfood.
已知抛物线y=ax2+bx+2经过点A﹣1﹣1和点B3﹣1. 1求这条抛物线所对应的二次函数的表达式. 2写出抛物线的开口方向对称轴顶点坐标和二次函数的最值.
15分Abusdriver'smainresponsibilityissafelytransporting1passenger.Butwhenonebusdriversawachildonthestreetneededhelpshestoppedeverythingandnowshe2regardasaheroineforit. LatelastmonthKarenMartineznoticedasmallboy3wanderonthestreetalonewithoutanyshoes.4shewasinthemiddleofherbusroutesheknewshehadtodosomethingtohelptheboy5wasjustfiveyearsold. Martinezpulledovergotoutofthebusandapproachedtheboy.Asshegotalittle6closeshecouldseehewasshakingfromthecold.Without7hesitateshecarriedhimbackedtothebussohecouldwarmupwhilewaitedforpolicetoarrived.OKgoandfindaseatwhereit'swarmMartinezsaidtotheboy8soft.WhentheywaitedMartinezgavetheboysomethings9drawwithandevenlethimsitbehindthebigsteeringwheeltocheerhim10.Shortlyafterpolicearrivedandreturnedtheboytohisparents
所以均衡饮食与良好的饮食习惯对我们有很多益处.balanceddietbenefit .
化学课上老师拿出三朵用石蕊溶液处理过的紫色小纸花如图向纸花上分别喷洒不同的溶液三朵纸花显色情况为①紫色②红色③蓝色.喷喷在②号纸花上的溶液可能是
6分 WelcometoHolkerHall&Gardens VisitorInformation HowtoGettoHolker ByCarFollowbrownsignsanA590fromJ36M6.ApproximatetraveltimesWindermere﹣20minutesKendal﹣25minutesLancaster﹣45minutesManchester﹣1hour30minutes. ByRailTheneareststationisCark﹣in﹣CartmelwithtrainstoCarnforthLancasterandPrestonforconnectionstomajorcities&airports. OpeningTimes Sunday﹣FridayclosedonSaturday1100am﹣400pm30March﹣2ndNovember. AdmissionCharges Hall&GardensGardens Adults£12.00£8.00 Groups£9.00£5.5 SpecialEvents ProducersMarket13thApril Joinustotasteavarietyoffreshlocalfoodanddrinks.Meettheproducersandgetsomeexcellentrecipeideas. HolkerGardenFestival30thMay Theeventcelebratesits22ndanniversarywithagreatshowoftheverybestofgardeningmakingitoneofthemostpopulareventsingardening. NationalGardenDay28thAugust Holkeronceagainopensitsgardensinaidofthedisadvantaged.Forjustasmalldonationyoucantakeatourwithourgardenguide. WinterMarket8thNovember Thisisaneventforallthefamily.Wanderamongavarietyofshopssellinggiftswhileenjoyingalivemusicshowandnicestreetentertainment. 1HowlongdoesitprobablytakeatouristtodrivetoHolkerfromManchester A.20minutes. B.25minutes. C.45minutes. D.90minutes. 2HowmuchshouldamemberofatourgrouppaytovisittoHall&Gardens A.£l2.00. B.£9.00. C.£8.00 D.£5.50 3Whicheventwillyougotoifyouwanttoseealivemusicshow A.Producers'Market. B.HolkerGardenFestival. C.NationalGardenDay. D.WinterMarket.
二次函数y=x2﹣8x的最低点的坐标是.
Tomisenergyandeverybodysaysheisalwaysworking.efficient
下列物质在氧气中燃烧产生大量白烟的是
四位同学在研究函数y=x2﹣2x+7时甲发现开口方向向上乙发现当x=﹣1和1时y的值相等丙发现函数有最低点丁发现当x=2时y=7.已知这四位同学中只有一位同学发现的结论是错误的则该同学是
求二次函数y=x2﹣6x+1的顶点坐标并直接写出y随x增大而增大时自变量x的取值范围.
中国变得越来越富裕.become .
解下列方程 ①2x2﹣x﹣2=0用公式法 ②x2﹣2x﹣2=0用配方法.
下列金属活动性最强的是
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