what was responsible for the change in the melting point?

Introductory Chemistry For Today
8th Edition
ISBN:9781285644561
Author:Seager
Publisher:Seager
Chapter6: The States Of Matter
Section: Chapter Questions
Problem 6.74E
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a student obtained a solid product in a laboratory synthesis. to verify the identity of the solid, she measured its melting point and found that the material melted over a 12°C range. After it had cooled, she measured the melting point of the same sample again and found that this sharp melting point at the temperature that is characteristic of the desire product. why were the two melting point different? what was responsible for the change in the melting point?
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