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现欲通过加热氯酸钾和加热氯酸钾与二氧化锰（二氧化锰由高锰酸钾制氧气的残渣中提纯得到，其残渣中只有二氧化锰不溶于水）的混合物两个对比实验，比较生成氧气速率的大小来证明高锰酸钾制氧气残渣中的二氧化锰是否具有催化作用．试回答下列问题： （1）要从残渣中得到纯净干燥的二氧化锰固体，需依次通过______、______和烘干三步主要操作． （2）进行上述对比实验，并限用带火星的木条来检验生成的氧气，必需的玻璃仪器的名称是______．（选填：①试管②橡皮塞③酒精灯④铁架台⑤集气瓶） （3）若要进一步证明二氧化锰是反应的催化剂而不是一般的反应物，上述的实验中还要用到托盘天平，其作用是______． （4）若不用使木条复燃的方法，你还能使用哪种简单的方法来检验生成氧气的速率大小，______．如果二氧化锰具有催化作用，用你的方法能观察到的现象是______．
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