我们在初中化学里学过的一些物质有重要的用途。请从以下物质中选

我们在初中化学里学过的一些物质有重要的用途。请从以下物质中选择,用它们(或其主要成分)的化学式填空。高锰酸钾、食盐、熟石灰、氮气、碳酸氢铵、天然气

    (1)可用于改良酸性土壤­____________       (2)可用于保护气____________

    (3)可用于实验室制取氧气____________   (4)可作为燃料____________

答案

Ca(OH)2  N2  KMnO4  CH4

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