您好,欢迎访问三七文档
不排除由于是进行产品质量评审时,在项目的设置、抽样方法与质量检验的严谨程度上,都尚存在一定的问题;所以产品评审的过程需要进一步改进;以便更真实地反映情况出产品的真实问题;从而更全面、更本质地反映产品质量存在的问题与真实水平centerpinchecksandanchoringtheinnercylinder.AccordingtoWhilecouplingalignmentshouldkeepoiloutofcavityandlocatetherotoraxisneckraisedarewithintheprescribedlimits,thereshouldbenogaps,Horn,HornandHorn0.05mmfeelergaugesfitinto.Centercoupling,condenserwaterfillingandwater-filledaccordingtofactoryrequirement.ForcouplingthreesupportedrotorCenter,themouthunderthecouplingbetweenthevalueshouldbeasstipulatedinthemanufacturer,usually0.15~0.25mm.Inthecaseofcouplingconnection,ifpossible,liftingonlyonebearingendofthesupportbearingoftherotor,removethebearing,fittedwithspecialtilesandspecialliftingtools,discrotors,checkthejournalfluttertile,shouldgenerallybelessthan0.10MM.Whenthecouplingsandrotorcomeswhenthereisaconflict,thecouplingCentreshallprevail.6.4.5.2.2shaftlookingfor:...6.4.5.3.Provisionalboltconfirmedthepositioningoftherotorsize,aswellasthecouplingbetweentheadjustmentshimthicknessaccuracy,drawingstomeetthetechnicalrequirements.Plane,cylindricalandcleanthecouplingboltholesshouldbecleanandwithoutburrs,scrapironandgrease-free,relativepositionofthecouplingaccordingtothedrawingrequirementsare.Couplingtopscrews,rounddistanceapart,indicatorstomonitormovementoftheaircraft,itsvalueisallowedtopassthevalueaxismoving,mountedadjustmentpads,notepadsinstallationdirectionguidepincouplingwithprocessendclosed.Thebackwheelsslowlytightened,when2mmorso,withstandardwhitebarswheretwobackwheelboltholemeasurementaboveandbelow,confirmtwobackwheelboltholeconcentricity.Then,thesymmetricalhorizontalmounttwotemporaryboltstightened,attentiontomonitordialindicator,theninstallthesymmetricaltemporarybolts,thistimesitesslowlymovingrotor,inthemeasuredcircumferenceof8equalpartsbackwheelrimrock,eachmeasuringrelativechangesinvalueshouldbelessthan0.02mm.6.4.5.4couplingreamedandpairedboltreamingdiereamer,adjustablereamers,boringmill,inseveralways.6.4.5.4.1Generalrequirementsbeforereamingorboring,第三章第一节第二课时铝的性质教学目标知识与技能:1、了解铝的物理性质,理解铝的化学性质。2、通过学生实验和理论分析,掌握铝与氢氧化钠溶液的反应3、进一步练习离子反应和氧化还原反应过程与方法1、通过对铝化学性质的预测,让学生初步感知类比迁移的方法2、通过加热铝箔,提高学生的实验操作、观察和语言描述能力。3、在研究铝与氢氧化钠溶液反应气体产物时,让学生进一步体会用实验方法确定气体的一般过程。情感态度与价值观1、了解铝制品在生产生活中的应用2、通过化学实验方法培养学生严谨求实的态度。3、通过铝既能与酸又能与碱反应,体会事物的一般性和特殊性。重点:铝的化学性质难点:铝与氢氧化钠反应产物的探究教学方法:类比,问题引导教学过程一.【物理性质】图片展示:铝的几种用途(附加镁的物理性质及用途)提问:根据图片及铝片实物分析归纳铝的物理性质。二.【铝的原子结构】提问:复习铝在地壳中含量介绍:铝在自然界以化合态形式存在;单质铝最早是在1827年由德国化学家韦勒用金属钾和无水氯化铝共热得到的。小结:铝的原子结构及在反应中的特点三.【铝的化学性质】提问:请大家根据铝的原子结构以及初中学过的金属的通性,完成“问题一”预测铝能和哪些物质发生化学反应。1.与非金属单质反应:(1)铝在氧气中燃烧的实验视频添加镁与氮气反应视频明确任务:重点来研究铝在不同条件下与氧气的反应。播放视频:“铝在氧气中燃烧的实验”(2)铝箔在空气中加热视频说明:操作步骤提问:实验现象?追问:熔化不滴落的原因?应用延伸:试剂瓶中的铝片、铝箔,日常用到的铝锅铝盆,铝制电缆能够在空气中稳定存在,正是因为在常温下表面形成了这层致密的氧化膜,起到了保护的作用。提问:铝在空气中加热的化学方程式提问:此反应的还原剂?扩展:铝除了能被氧气氧化,还能被氯气、硫等非金属单质氧化,生成对应的氯化物和硫化物。2.与盐反应——与硫酸铜溶液反应展示:铝与硫酸铜的反应提问:铝与硫酸铜溶液反应的实验现象?不排除由于是进行产品质量评审时,在项目的设置、抽样方法与质量检验的严谨程度上,都尚存在一定的问题;所以产品评审的过程需要进一步改进;以便更真实地反映情况出产品的真实问题;从而更全面、更本质地反映产品质量存在的问题与真实水平centerpinchecksandanchoringtheinnercylinder.AccordingtoWhilecouplingalignmentshouldkeepoiloutofcavityandlocatetherotoraxisneckraisedarewithintheprescribedlimits,thereshouldbenogaps,Horn,HornandHorn0.05mmfeelergaugesfitinto.Centercoupling,condenserwaterfillingandwater-filledaccordingtofactoryrequirement.ForcouplingthreesupportedrotorCenter,themouthunderthecouplingbetweenthevalueshouldbeasstipulatedinthemanufacturer,usually0.15~0.25mm.Inthecaseofcouplingconnection,ifpossible,liftingonlyonebearingendofthesupportbearingoftherotor,removethebearing,fittedwithspecialtilesandspecialliftingtools,discrotors,checkthejournalfluttertile,shouldgenerallybelessthan0.10MM.Whenthecouplingsandrotorcomeswhenthereisaconflict,thecouplingCentreshallprevail.6.4.5.2.2shaftlookingfor:...6.4.5.3.Provisionalboltconfirmedthepositioningoftherotorsize,aswellasthecouplingbetweentheadjustmentshimthicknessaccuracy,drawingstomeetthetechnicalrequirements.Plane,cylindricalandcleanthecouplingboltholesshouldbecleanandwithoutburrs,scrapironandgrease-free,relativepositionofthecouplingaccordingtothedrawingrequirementsare.Couplingtopscrews,rounddistanceapart,indicatorstomonitormovementoftheaircraft,itsvalueisallowedtopassthevalueaxismoving,mountedadjustmentpads,notepadsinstallationdirectionguidepincouplingwithprocessendclosed.Thebackwheelsslowlytightened,when2mmorso,withstandardwhitebarswheretwobackwheelboltholemeasurementaboveandbelow,confirmtwobackwheelboltholeconcentricity.Then,thesymmetricalhorizontalmounttwotemporaryboltstightened,attentiontomonitordialindicator,theninstallthesymmetricaltemporarybolts,thistimesitesslowlymovingrotor,inthemeasuredcircumferenceof8equalpartsbackwheelrimrock,eachmeasuringrelativechangesinvalueshouldbelessthan0.02mm.6.4.5.4couplingreamedandpairedboltreamingdiereamer,adjustablereamers,boringmill,inseveralways.6.4.5.4.1Generalrequirementsbeforereamingorboring,对比完善一下实验现象提问:请写出此反应的离子方程式提问:在这个反应中谁做还原剂?谁是还原产物?归纳:铝与盐反应特点3.与酸反应——与盐酸反应视频演示:铝与盐酸的反应提问:看到了什么现象?提问:写出此反应离子方程式提问:写出铝和稀硫酸反应的离子方程式提问:反应中铝与氢气的比例关系4.与氢氧化钠溶液反应说明:操作步骤提问:现象?追问:产生的气体是什么?追问:如何检验你猜测的气体?结论:铝能与氢氧
本文标题:铝及其化合物教案
链接地址:https://www.777doc.com/doc-6508913 .html