Because you need to know that it is absolutely pure if you are to rely absolutely on its M.P. Alloys have a wide range of MPs, depending on the exact composition. If you can be sure that your sample is pure lead then you have already identified it !
You could see which one would melt first.
The melting point can help a scientist identify a substance.
If you know the melting point and boiling point of a substance, you could look them up in a table to see what substances have those melting and boiling points. In practice, there are lots of other tests you'd probably want to do in addition, because in general there's no guarantee that an unknown substance is a single pure compound.
Melting points and boiling points are phyical constants which means specific compounds have specific melting/boiling points. Therefore you can identify a substance if you determine the mp/bp. Also you measure the purity of a mixture using melting point tests.
boiling point --------- Boiling point is a specific characteristic of a substance or element; the mechanical strength, the viscosity, the electrical resistivity are more difficult to be used for a sure identification of a substance.
melting
Knowing the melting point of a substance provides information to determine what the substance is if its unknown. If you are making a substance, checking the melting point will let you know if you have made what you set out to make, (because impurities can mess up the melting point)
The melting point can help a scientist identify a substance.
melting point
Each pure substance has its own unique melting and boiling point.
i dont know :P
through it's boiling, melting, and freezing point.
The traditional ones are melting point and boiling point.
*usually* melting point is a good indicator of a substance's purity. The technique of melting point determination is used frequently in organic chemistry labs.
texture,melting point and odor ;D
The traditional ones are melting point and boiling point.
Pure substances have very specific melting (and boiling) points. Assuming the substance is pure you could measure the melting point and compare it to a known database of melting points.
If you know the melting point and boiling point of a substance, you could look them up in a table to see what substances have those melting and boiling points. In practice, there are lots of other tests you'd probably want to do in addition, because in general there's no guarantee that an unknown substance is a single pure compound.