If you need to identify a material without changing the object in anyway, should you use physical or chemical properties?

you need to identify the materials in an object without changing the object in any way. Should you use physical or chemical properties to identify the material? Explain your choice. You should us physical properties because if you used chemical properties, you would have changed the material in the object.

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the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.