把一个化合物分解成元素。

Split a compound into its elements.

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当一个化合物被分解的时候，原子有恢复原来未曾改变的面貌。

And when a compound is decomposed, the atoms are recovered unchanged.

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在确定一个化合物的结构式之前，首先应知道它的分子式。

Before we can assign a structural formula to a compound, we must first know its molecular formula.

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It's one of the only compounds, there's only I think three, where the density actually goes down when it freezes.

它是我见过的，唯一一个，在降温时密度下降的化合物。

麻省理工公开课 - 固态化学导论课程节选

Maybe you're not looking at a reaction, but you've got some new compound, and you're looking at it go from liquid to solid or to gas.

也许你研究的不是一个反应,但你得到了一种新的化合物,你看着它从液体变成了固体或气体。

麻省理工公开课 - 热力学与动力学课程节选

And when a compound is decomposed, the atoms are recovered unchanged.

当一个化合物被分解的时候，原子有恢复原来未曾改变的面貌。

麻省理工公开课 - 固态化学导论课程节选