How do you determine the melting point of a substance?
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Consequently, how do you determine the melting point of a pure substance?
Determining the melting point of a compound is one way to test if the substance is pure. A pure substance generally has a melting range (the difference between the temperature where the sample starts to melt and the temperature where melting is complete) of one or two degrees.
Also, how is melting point measured? The temperature of the sample is measured with a digital thermometer. The sample is heated slowly as the temperature approaches the MP, while the sample is carefully observed. The temperature at which the first drop of liquid is observed is recorded as the beginning of the melting point range.
Beside this, how do you determine the melting point of a substance on a graph?
Looking from left to right on the graph, there are five distinct parts to the heating curve:
- Solid ice is heated and the temperature increases until the normal freezing/melting point of zero degrees Celsius is reached.
- The first phase change is melting; as a substance melts, the temperature stays the same.
What factors affect melting point?
- Inter Molecular Forces. When the attraction between molecules are weaker, we can say that the inter molecular forces are weak.
- Shape of Molecules. Shapes of molecules also affect the melting of a substance.
- Size of Molecules.
- Other Factors.