How can you tell if something is made of the same substance?

Question

Is it because the density is the same?
When calculating mass/volume = density.
If two samples come up with the same density does that mean they are made up of the same substance?

Answer 1

No, it doesn't. Two different substances could easily have densities that were the same within your experimental error. At the same time, two samples could be made from the same substance but have different densities, if one of them had a hidden cavity. This could also cause different substances to appear to have the same density. For example, a hollow aluminim ball and a solid aluminum ball would seem to have different densities, while a hollow lead ball might appear to have the same density as a solid aluminum one.

Answer 2

Archimedes principle is that diference in density with famous King"s Thach fault.Microscope searching is the best way to analysis two substance today.The same density does it mean they are made of the same substance.

Answer 3

Density is one of many properties that could be used, but is not sufficient to prove that two items are same substance.

One could test reactivity with acids, bases, metals; heat capacity, boiling, freezing and melting point, etc.

Only is many of these tests have identical results could you deduce that the substances are the same.

Answer 4

I have two theories 1) At early stage before birth they join the legs together? before birth the chestnuts is soft and after birth goes hard. 2) Throw evaluation horses at the beginning had 3 toes, 2 then 1 and the chestnut is the evidence of that would have been 2nd toe. We had a discussion about this in our horse anatomy and physiology while i was doing pre farrery.

Answer 5

The best way to confirm it is by elemental analysis and NMR.