氧气的性质用途和制取归纳.docx
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氧气的性质用途和制取归纳.docx
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氧气的性质用途和制取归纳
.
【考纲要求】掌握氧气的主要性质和用途;能用氧气的性质解释一些常见的现象。
1.铁等物质在氧气中燃烧的化学方程式,并能准确的描述这些反应的现象。
2.能正确写出木炭、红磷、硫、操作方法;了解氧气的工业制法。
3.掌握实验室制氧气的原理、装置、【知识网络】
在通常状况下,氧气是无色无味的气体密度比空气大物理性质
不易溶于水
C+OCO木炭在氧气中燃烧,发出白光,放出热量,生成可使澄22清石灰水变浑浊的气体
S+OSO硫在氧气中燃烧,发出明亮的蓝紫色火焰,放出热量,22生成无色有刺激性气味的气体
2PO红磷在空气中燃烧,放出热量,产生大量的白烟氧气化学性质4P+5O252
FeO铁丝在氧气中剧烈燃烧,火星四射,放出热量,生3Fe+2O234
成黑色固体
2HO2HO+O↑2222△反应原理2KMnOKMnO+MnO+O↑22244
MnO22KCl+3O↑2KClO实验室制法23△制取装置:
①固、固加热型;②固、液常温型
收集装置:
①排水法;②向上排空气法
检验方法;将带火星的木条伸入集气瓶中,若木条复燃,证明是氧气
工业制法:
①分离液态空气;②膜分离技术
用途:
①供给呼吸;②支持燃烧
【考点梳理】
考点一、氧气的性质和用途
1.氧气的物理性质:
(1)通常状况下,是无色、无味的气体,可液化和固化。
(2)不易溶于水。
(3)密度比空气略大。
2.氧气的化学性质:
文档Word
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first,agricultdlowpattern.Lowisreflectedinthequalityandlow;short,valueaddedoftheindustrychainislow;123fusionyielployeeage,lowquality.Smallisreflectedinsmaller,specializedcooperativesthroughoutthecks
illlaonand191.Hardisapeasants,peasants.Fourwatereffectsstcservicesupplygap,ruraleducation,healthcare,pensionsandotherservicescannotmeetthedemandstilldifficultforpovertyalleviation,withemphasisonpovertyalleviatihatthereformmeasuresgraccountedfor70%overtheageof50.Bigistoundresistance,suchasthetransactionsofpropertyrights,landreplacement;publi氧气是一种化学性质比较活泼的气体,能与许多物质发生化学反应,在反应中提供氧,具有氧化性,是常用的氧化剂。
物质在空气中和在氧气中燃烧现象的比较:
反应物反应现象化学方程式或文字表达式在空气中在氧气中
C+OCO燃烧更旺,发出白光,放出热木炭持续红热,放出热量22
量,产生的气体使澄清石灰水(黑)变浑浊
SOS+O发出明亮的蓝紫色火焰,放出(黄)硫发出微弱的淡蓝色火22
热量,产生一种有刺激性气味产生一焰,放出热量,种有刺激性气味的无的无色气体色气体
发出耀眼白光,放出热量,产放出红磷发出黄白色的光,O2P4P+5O522生大量白烟热量,产生大量白烟铁丝
剧烈燃烧,火星四射,放出热离火后持续加热发红,O3Fe+2OFe423量,生成黑色固体变冷(不燃烧)
镁条
在氧气中燃烧更加剧烈,放出放在空气中即可燃烧,O2Mg+22MgO
出大量的热和耀眼的大量的热和耀眼的白光,生成白色固体白光,生成白色固体
燃烧更旺,发出白光,放出热放出产生黄白色光焰,蜡烛石蜡+氧气
在火焰上方罩一二氧化碳+水量。
在火焰上方罩一个干冷的热量。
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- 关 键 词:
- 氧气 性质 用途 制取 归纳