Her er hvorfor:
* Ren forbindelse: A pure compound is made up of only one type of molecule. In the case of chloroform, it's a single molecule consisting of one carbon atom, one hydrogen atom, and three chlorine atoms (CHCl₃).
* Blanding: A mixture is made up of two or more substances that are not chemically bonded. De kan adskilles med fysiske midler.
Since chloroform has a fixed chemical formula and consists of only one type of molecule, it is considered a pure compound.
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