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近年来,水的作用是在高考中经常考查的内容.本文在对在化学中水作用进行综合阐述.一、物理性质的应用1.收集气体因为水是极性物质,对那些极性小难溶于水水的气体可用排水法收集气体如H2、O2、CH4等.用排水集气法收集的气体纯度高.当固体与固体混合加热制取气体,用排水法收集完气体后,要先撤导管后撤酒精等,以免发生水倒吸引起试管炸裂.2.检漏作用在化学实验中,有些具有磨口封闭的活塞或瓶塞的的仪
In recent years, the role of water in the college entrance examination is often examined the contents of this paper on the role of chemical water in a comprehensive exposition.One, the physical properties of the application 1. Gathering gas Because water is a polar substance, those polar little difficulty Dissolved in water and water gas drainage method can be used to collect gases such as H2, O2, CH4, etc. Use the drainage gas collection method to collect the gas purity is high.When the solid and solid mixed heating system to obtain gas, drainage method to collect the gas, the first Withdrawal of catheter retraction of alcohol, etc., in order to avoid water poured suction tube burst caused 2. Leak detection In chemical experiments, some with closed-end piston or stopper of the instrument