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A student checks the volume, melting point, and shape of two unlabeled samples of matter and finds that the measurements are identical. He concludes that the samples have the same chemical composition. Is this a valid conclusion? What additional information might be collected to test this conclusion?
The main difference between physical and chemical change is that physical change does not produce a new substance, and chemical change creates a new substance.
We will now show this on the diameter of the iron:
if we take a piece of iron and start to melt it at a certain temperature, there will be a change in its physical state, but there is no change in its composition. It is a physical change.
if we expose a piece of iron to the air, rust will appear after a while. It is an oxidation process and it is a chemical change.
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