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OpenStudy (anonymous):
How are pure crystalline substances characterized?
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OpenStudy (abb0t):
I think this belongs in Chemistry section, but nonetheless, a crystalline substance is one where atom arrangement are ordered and very nicely organized, meaning they have a very nice geometry and don't move. Pure crystalline subtances also have a set melting point. You can test whether a substance is pure or not by checking it's melting point. Reference melting points are posted on many websites such as Wikipedia.
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