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知识点一:水的组成例1有关电解水的实验(如图)的下列叙述,错误的是()A.试管甲中的气体是氢气B.试管乙中的气体是氧气C.该实验说明水由氢气和氧气组成D.该实验说明水由氢元素和氧元素组成【解析】此题中判断甲、乙两试管的气体有两种方法,一是根据电极:正氧负氢;二是根据生成气体的体积,在电解水实验中,正极(氧气)和负极(氢气)生成气体的体积比是1:2。水宏观上讲是由氢元
Knowledge Point 1: Composition of Water Example 1 The following statement about the experiment of electrolyzed water (pictured) is incorrect: (A) The gas in test tube A is hydrogen B. The gas in test tube B is oxygen C. The experimental description Water consists of hydrogen and oxygen D. The experiment shows that the water is composed of hydrogen and oxygen elements [Analytical] Judgment in this question A, B two test tube gas there are two ways, one is based on the electrode: positive oxygen negative hydrogen; the second is According to the volume of the generated gas, the volume ratio of the positive electrode (oxygen) and the negative electrode (hydrogen) generation gas in the electrolytic water test was 1: 2. Water macro is by hydrogen element