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W0lf93
A melting point is the characteristic physical property of a substance. So melting point analysis is one of the simplest and most useful techniques for identifing of a chemical substance. Melting point analysis can also provide information about the purity of a sample. A substance containing soluble impurities usually melts at a lower temperature than the pure compound. It can also melt over a wide range of temperatures. The smaller the range of melting temperatures, the higher the purity of the sample.

Answer:

melting point depression of the phenomenon of reduction of the melting point of a material with reduction of its size. the phenomenon is very prominent in nenoscale material, which melt at temperatures hundreds of degrees lower then bulk materials

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