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人类生活必不可少的物质，结合化学知识回答下面有的问题： （1）将装满一瓶水的塑料瓶放入冰箱，待水结冰时，塑料瓶膨胀了，试解释其原因：______． （2）日常生活中使用硬水会带来许多麻烦．如果你想知道硬水还是软水，我们可以用______检验，长期使用硬水，会给生产生活带来一些危害，如，水壶内容易结成水垢，如果你想除去家里水壶中的水垢，可以用厨房中的______；长期饮用硬水对人的身体健康也不利，要降低水的硬度，应采取的方法．______． （3）空气中也含有水分，试举出日常生活中的一个事实来证明这一结论．______ （4）茶杯内的纱网，可以将茶叶与茶水分离，便于饮用，该设计利用的化学原理是______． （5）试归纳水的化学性质，并写出正确的化学方程式： 化学性质 化学方程式 如：通电能分解 2H 2 O 通电 . 2H 2 ↑+O 2 ↑ 与非金属氧化物发生化合反应 与金属氧化物发生化合反应
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