被称为“绿色氧化剂”的过氧化氢(H2O2)俗称双氧水,是一种无色液体,常用作无公害的消毒剂和漂白剂等.
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(1)氧气具有助燃性能使带火星的木条复燃.①在试管中加入5mL 15%的过氧化氢溶液,用带火星木条伸入试管内;②再加入少量二氧化锰后,用带火星木条伸入试管内;(2)预测可能出现的实验现象及相应的结论:
第一步现象:木条没有复燃;结论:没有氧气生成;
第二步的现象木条复燃;结论:有氧气生成;
(3)如果二氧化锰能作双氧水分解的催化剂.分离反应混合物中的MnO2,洗净、干燥、称量,其质量将不变;反应化学方程式为2H2O2
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