A student is given 2 pure samples, A and B. what is a simple procedure to determine if they are both the ..?

same coumpoud

Measure the FTIR spectrum of each & compare.
I'm guessing you wont have an FTIR spectrometer tho' so testing depends a lot on what the samples are. e.g. are they liquid or solid. Compare the densities and/or if they are not inorganic salts you could compare the melting points. If liquids, compare the boiling points. If they are the same it still only means that they are likely to be the same.

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