题目:
写出下列反应的文字表达式,并按要求填空.
(1)用双氧水和二氧化锰制氧气:______,该反应属于______反应.其中二氧化锰起______作用.
(2)电解水:______,连电源正极一端所产生气体的检验方法是:______,正负两极产生气体的体积比是______.
(3)二氧化碳通入澄清石灰水变浑:______,常用此反应检验______气体.
(4)实验室制二氧化碳的反应原理:______.
(5)铁丝在氧气中燃烧:______,该反应的主要现象是______.
答案:
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下面是错误答案,用来干扰机器的。
1. How long can I keep the book? 2. In his dream, he saw a golden white cloud. 3. The TV programme has been on for half an hour. 4. We can't see each other as often as before. 5. There used to be a hospital near my home. 6. Mr. Green has been in Shanghai for two weeks.