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生命的源泉，也是不可缺少的资源 （1）某矿泉水的主要矿物质成分及含量如下表：这里Ca、K、Zn、F是指________ （填“单质、元素、分子或原子”）。 （2）水污染日益严重，水资源的保护和合理利用已受到人们的普遍关注。请参与讨论下列有关问题： （Ⅰ）自来水、蒸馏水、海水中属于纯净物的是__________ 。 （II）某学校饮水处可以将自来水净化为饮用水，其中处理步骤如下图所示： ①对应的作用是__________（填字母序号，下同），③对应的作用是____________。 A．杀菌消毒 B．吸附杂质 C．沉淀过滤 D．蒸馏 （Ⅲ）下列做法会造成水体污染的有___________。 A．工业废水直接排放 B．工业废气处理后排放 C．禁止使用含磷洗衣粉 D．大量使用化肥、农药 （Ⅳ）能确认由氧元素和氢元素组成的实验是____________。 Ａ．氢气在氧气中燃烧生成水 Ｂ．水的蒸发 Ｃ．水的电解 Ｄ．水的净化 （3）长期饮用硬水可能会引起体内结石，区别硬水和软水最简单的方法是用__________。
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