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人民教育出版社义务教育课程标准实验教科书九年级《化学》上册第二单元课题3《制取氧气》中有一个制取氧气的演示实验(实验2-5),在试管中加入5ml 5%的过氧化氢(双氧水),再向试管中加入少量二氧化锰,然后用带火星的木条试验,带火星的木条复燃,说明有氧气产生,可用这一方法制取氧气。课本上的这个实验是一个演示实验,目的只是让学生知道双氧水在二氧化锰的催化作用下可以很快放出氧气,并引出催化剂概念,但在考试中,往往要求学生会用双氧水来制取并收集氧气,
People’s Education Press compulsory education curriculum standard experimental textbook ninth grade “chemistry” on the second unit of the project 3 “oxygen preparation” in a preparation of oxygen experiments (experiments 2-5), in the test tube by adding 5ml of 5% Hydrogen peroxide (hydrogen peroxide), and then add a small amount of manganese dioxide in the test tube, and then with a strip of Mars test, with the regeneration of the martian wood, indicating the oxygen produced, this method can be used to obtain oxygen. The experiment on the textbook is a demonstration experiment aimed only at making students aware that hydrogen peroxide can quickly release oxygen under the catalysis of manganese dioxide and leads to the concept of a catalyst. However, in exams, students are often asked to take hydrogen peroxide for collection oxygen,