I measured the melting point of the solid in 12 degrees celcius range, I cooled it down and melted it again but the result is different. Why is that their melting point are different? What was the responsible in the change of melting point?

I measured the melting point of the solid in 12 degrees celcius range, I cooled it down and melted it again but the result is different. Why is that their melting point are different? What was the responsible in the change of melting point?

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter9: Liquids, Solids, And Materials

Section9.4: Solids And Changes Of Phase

Problem 9.5PSP

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Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.

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