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15问答网 > c和si在同一族,为什么常温下co2是气体,而sio2是固体?

c和si在同一族,为什么常温下co2是气体,而sio2是固体?

2025-04-03 22:07:57

推荐回答（2个）

回答1：

CO2是分子晶体，分子之间以分子间作用力相互作用.
SiO2是原子晶体，尽管写成 SiO2，,但是其内部并没有单个的分子，原子之间以共价键结合.
共价键的强度远大于分子间作用力，破坏共价键所需要的能量大，故常温下是固体。
而CO2变为气体，只需要克服分子间作用力即可，需要的的能力小，故常温下是气体。

回答2：

CO2是分子晶体
SiO2是原子晶体

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