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如图是关于二氧化碳性质的实验探究．向盛满CO2的软塑料瓶中加入约体积的水，立即盖紧瓶盖，振荡.（1）此实验探究目的是 ，能证明此性质的实验现象是 （2）二氧化碳溶于水后是否发生了化学变化？ ...
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二氧化碳的化学性质CO2CO2能与水反应CO2能与氢氧化钙反应
某校实验小组同学对人体吸入的空气和呼出的气体中的氧气二氧化碳有什么不同这一课题进行研究【查阅资料】二
下列A.B.是探究物质性质的实验二氧化碳是否可以溶于水很难直接观察到现象可以通过A.中塑料瓶____
某化学兴趣小组的同学对实验室制取二氧化碳及相关性质进行一系列的探究活动⑴气体制取按如图1所示的制取装
二氧化碳的物理性质CO2是一种的气体密度比空气溶于水固体二氧化碳叫
如图是教材中二氧化碳的溶解性实验——向一个收集满二氧化碳气体的质地较软的塑料瓶中加入约体积的水立即旋
根据你的所学请回答有关问题1用一个空的软塑料瓶收集一瓶二氧化碳气体在瓶中倒入1/3容积的水立即盖紧瓶
有关二氧化碳的实验中能达到实验目的是
将燃着的木条伸入集气瓶中，检验二氧化碳是否集满
将二氧化碳通入澄清石灰水，证明无色无味气体是二氧化碳
往盛满二氧化碳的软塑料瓶中倒入
的水，证明二氧化碳溶于水生成碳酸
将燃着的木条伸入集气瓶中，木条熄灭，证明该气体是二氧化碳
读案例并回答问题案例下面是两位教案备课库教师讲授二氧化碳第一课时的教学实录[赵老师的教学实录][问题与
案例下面是某位教案备课库教师讲授二氧化碳第一课时的教学片段[问题与情景]如下图装置向烧杯中倾倒一瓶气体
阅读下列两个相关材料材料1教科书二氧化碳的性质的部分呈现内容二氧化碳溶于水的过程中有没有发生化学变化
用二氧化碳CO2作爱护气体的熔化极气体爱护焊 称为二氧化碳气体爱护焊简称CO2焊
下图是教材中二氧化碳的溶解性实验﹣﹣向一个收集满二氧化碳气体的质地较软的塑料瓶中加入约体积的水立即旋
某实验小组同学为探究二氧化碳的性质做了如下几个实验如图1收集两塑料瓶500mL二氧化碳气体向甲瓶中加
下图是教材中二氧化碳的溶解性实验﹣﹣向一个收集满二氧化碳气体的质地较软的塑料瓶中加入约体积的水立即旋
科学探究是学习化学最重要的方法下面是对二氧化碳有关问题的研究请回答有关问题1用一个空的软塑料瓶收集一
从下列实验现象所获得的实验结论正确的是
无色溶液中滴加酚酞试液无现象，说明溶液呈中性
无色气体在空气中燃烧，产生可以使澄清石灰水变浑浊的气体，说明气体是甲烷
向盛放少量植物油和水的试管中加入几滴洗涤剂后，振荡，液体不分层，说明植物油可溶于水。
向一个集满二氧化碳的质地较软的塑料瓶中加入约1/3的水，塞紧瓶塞，振荡，塑料瓶变瘪，说明二氧化碳能溶于水。
变量控制是设计对比实验的核心在探究二氧化碳与水的反应中某同学做了以下对比实验取四朵用石蕊溶液染成紫色
通过实验可观察到：实验Ⅱ、Ⅲ中紫花没有变色，实验Ⅰ、Ⅳ中紫花变为红色。
实验Ⅲ与实验Ⅳ对比，控制的变量为小花是否与水接触。
实验Ⅰ与二氧化碳的性质无关，是辅助实验，证明了酸可以使紫色石蕊溶液变红。
这四组实验既证明了二氧化碳易溶于水，还证明了二氧化碳与水反应生成酸。
下图是教材中二氧化碳的溶解性实验——向一个收集满二氧化碳气体的质地较软的塑料瓶中加入约l／3体积的水
为了探究二氧化碳的性质某同学进行如右下图所示的实验你认为该实验不能说明的是
二氧化碳不能燃烧
CO
2
不能支持燃烧
二氧化碳能与水反应
CO
2
的密度比空气大
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ThefilmbaseonanovelwrittenbyRobertJamesWallerhasreceivedmuchpopular.
Mostpeopleagreethathonestyisagoodthing.ButdoesMotherNatureagree?Animalscan'ttalkbutcantheylieinotherways?Cantheyliewiththeirbodiesandbehavior?Animalexpertsmaynotcallitlyingbuttheydoagreethatmanyanimalsfrombirdstochimpanzeesbehavedishonestlytofoolotheranimals.Why?Dishonestyoftenhelpsthemsurvive. Manykindsofbirdsareverysuccessfulatfoolingotheranimals.Forexampleabirdcalledtheploversometimespretendstobehurtinordertoprotectitsyoung.Whenapredator猎食动物getsclosetoitsnesttheploverleadsthepredatorawayfromthenest.How?Itpretendstohaveabrokenwing.Thepredatorfollowsthehurtadultleavingthebabybirdssafeinthenest. Anotherkindofbirdthescrubjayburiesitsfoodsoitalwayshassomethingtoeat.Scrubjaysarealsothieves.Theywatchwhereothersburytheirfoodandstealit.Butcleverscrubjaysseemtoknowwhenathiefiswatchingthem.Sotheygobacklaterunburythefoodandburyitagainsomewhereelse. Birdscalledcuckooshavefoundawaytohavebabieswithoutdoingmuchwork.How?Theydon'tmakenests鸟巢.Insteadtheygetintootherbirds'nestssecretly.Thentheylaytheireggsandflyaway.Whenthebabybirdscomeouttheiradoptive收养的parentsfeedthem. Chimpanzeesorchimpscanalsobesneaky.Afterafightthelosingchimpwillgiveitshandtotheother.Whenthewinningchimpputsoutitshandtoothechimpsarefriendlyagain.Butananimalexpertoncesawalosingchimptakethewinner'shandandstartfightingagain. Chimpsaresneakyinotherwaystoo.Whenchimpsfindfoodthattheylovesuchasbananasitisnaturalforthemtocryout.Thenotherchimpscomerunning.Butsomecleverchimpslearntocryverysoftlywhentheyfindfood.Thatwayotherchimpsdon'thearthemandtheydon'tneedtosharetheirfood. AschildrenmanyofuslearnthesayingYoucan'tfoolMotherNature.Butmaybeyoucan'ttrusthereither. 1Aploverprotectsitsyoungfromapredatorby. A.gettingclosertoitsyoung B.drivingawaytheadultpredator C.leavingitsyounginanothernest D.pretendingtobeinjured 2ByChimpanzeesorchimpscanalsobesneakyparagraph5theauthormeans. A.chimpsarereadytoattackothers B.chimpsaresometimesdishonest C.chimpsarejealousofthewinners D.chimpscanbeselfishtoo 3Whichofthefollowingistrueaccordingtothepassage? A.Cuckoosfooltheiradoptiveparentsbymakingnonests. B.Thelosingchimpwonthefightbytakingthewinner'shand. C.Somechimpslowertheircrytokeepfoodawayfromothers. D.Somecleverscrubjaysoftenstealtheirfoodback. 4Whichofthefollowingmightbethebesttitleofthepassage? A.Doanimalslie? B.DoesMotherNaturefoolanimals? C.Howdoanimalslearntolie? D.Howdoeshonestyhelpanimalssurvive?
TenyearsagoSeanCarterwasastudentatuniversity.Onenighthewas1inacarwithafriendwhohadbeendrinking.They2andSeanwasleftinawheelchair3abraininjury.HehasbeenunabletowalkortalksincethenandhismomJennyhasbeen4him. Whatwereyoufeeling5youfoundoutIhadbeeninacar6?Seanaskshismom.Seanspeaksbyusinghisfingerto7wordsontoaniPad.Thosewordsarethentranslatedintoaudio.IwasshockedJennysays.Itwasjustsohardseeingyourchild's8bodyinabedforsolong.Youcouldn'tdoanythingfortwoyears. OvertheyearsSeanhasbecomemore9thoughhesayshe'snotyetreadytodoeverythingalone.it's10livingwithyourmomwhenyou're32yearsoldJennysayswhileSean11andrepliesOhyeah! Jenny63thenaskshersonIfthiswasourlast12whatwouldyouwanttosay? Letme13yourightthereSeantellshismom.Iknowyouwillbehereformanyyearsto14.ButIwantyoutoknowhow15Iamforwhatyouhavedoneforme.Yougaveupyourlifetogivemealife. Yeah.Butit'sOKJennyresponds.16isreallythevaluegoodsthatwehaveandifyoucan17timewithsomebodyelsethat'sprobablythemostimportantthingyoucandoforsomeone.It'stheonlythingthat18. SeanrepliesIdon'tsaythisenough.You'rethepictureofunconditional19.Iadmireyour20tobethebestmomyoucanbeandyoudoafinejob.Iloveyoubeyondthemoonandback. 1A.chatting B.arguing C.driving D.playing 2A.crashed B.dashed C.attacked D.struggled 3A.of B.with C.for D.on 4A.givinginto B.takingcontrolof C.lookingforwardto D.takingcareof 5A.before B.through C.when D.because 6A.accident B.seat C.road D.track 7A.put B.type C.draw D.move 8A.strong B.heavy C.soft D.lifeless 9A.independent B.generous C.clever D.careful 10A.hard B.interesting C.foolish D.funny 11A.worries B.laughs C.cries D.complains 12A.dinner B.trip C.operation D.conversation 13A.reward B.forget C.stop D.expect 14A.come B.spend C.waste D.disappear 15A.regretful B.thankful C.painful D.understanding 16A.Hardship B.Friendship C.Emotion D.Time 17A.kill B.save C.share D.calculate 18A.matters B.survives C.lasts D.lives 19A.joy B.reward C.apology D.love 20A.idea B.duty C.story D.confidence
ItwasacoldMarchdayinHighPointNorthCarolina.ThegirlsontheWesleyanAcademysoftballwerewaitingfortheirnextturnsatbatduringpracticestampingtheirfeettostaywarm.Eighth﹣graderTaylorBisbeeshivered发抖alittleasshewatchedherteammateParisWhiteplay.Thetwodidn'tknoweachotherwell﹣Taylorhadjustmovedtotownamonthorsobefore. SuddenlyParisfelltothegroundParis'seyerolledbackTaylorsays.Shestartedshaking.Iknewitwasanemergency. ItcertainlywasParishadsufferedasuddenheartfailure.WithoutimmediatemedicalcarePariswoulddie.Atfirstnoonemoved.Thegirlswereinshock.ThenthesoftballcoachshoutedoutDoesanyoneknowCPR? CPRisalife﹣savingtechnique.TodoCPRyoupressonthesickperson'schestsothatbloodmovesthroughthebodyandtakesoxygentoorgans.Withoutoxygenthebrainisdamagedquickly. AmazinglyTaylorhadjusttakenaCPRcoursethedaybefore.Stillshehesitated.Shedidn'tthinksheknewitwellenough.ButwhennooneelsecameforwardTaylorrantoParisandbegandoingCPRItwasscary.IknewitwasthedifferencebetweenlifeanddeathsaysTaylor. Taylor'sswiftactionhelpedherteammatescalmdown.Onegirlcalled911.Twomorerantogettheschoolnursewhobroughtadefibrillatoranelectronicdevices器械thatcanshocktheheartbackintowork.Luckstayedwiththem:Paris'heartbeatreturned. IknowIwasreallyluckyParissaysnow.Mostpeopledon'tsurvivethis.Myteamsavedmylife ExpertssayParisisright.ForasuddenheartfailurethesinglebestchanceforsurvivalishavingsomeonenearbystepinanddoCPRquickly. TodayParisisbackonthesoftballteam.Taylorwillapplytocollegesoon.Shewantstobeanurse.IfeelmoreconfidentinmyactionsnowTaylorsays.IknowIcanactunderpressureinascarysituation. 1WhathappenedtoParisonaMarchday? A.Shecaughtabadcold. B.Shehadasuddenheartproblem. C.Shewasknockeddownbyaball. D.Sheshiveredterriblyduringpractice. 2WhydoesParissayshewaslucky? A.Shemadeaworthyfriend. B.Sherecoveredfromshock. C.ShereceivedimmediateCPR. D.Shecamebackonthesoftballteam. 3WhichofthefollowingwordscanbestdescribeTaylor? A.Creativeandkind. B.Courageousandcalm. C.Warm﹣heartedandgenerous. D.Intelligentandprofessional.
Iamabletolookatnaturedirtycurtainshangbeforeverydustywindows.
IgetajobinanofficesinceIwaswelleducatedthanmyfellows.
假如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的以下作文.文中共有10处错误每句中最多有两处.错误涉及单词的增加删除或修改. 增加:在缺词处加一个漏词符号∧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:在错词下面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. Mysoccercoachretiredinlastweek.Iwantedtodoanythingspecialforhimathisretirementparty.MymummakesthebetterbiscuitsintheworldsoIdecidetoaskherforhelp.Mumtaughtmesomebasicstepofbaking.Iinsistedondoingmostofthebakingmyself.Ithoughtthebiscuitswerereallywell.MyonlymistakewasthatIdroppedsomeonthefloorafterIwaspackingthemup.AtapartymycoachwithabiscuitinhismouthaskedsurprisinglywhomadethemandjokedImighthavetoretireagainnextyearjustgetsomemoreofthesebiscuits. Myfavoritepictureatthepartyisofmycoachandmeenjoythebiscuitswithhappylaughter!
甲每小时行4千米乙每小时行5千米则甲乙一小时共行千米y小时共行千米．
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