Question

how can testing conductivity help us identify a pure substance?

Explanation:

Conductivity testing can help identify a pure substance as different pure substances have characteristic conductivity values due to their unique atomic or molecular structures and the presence or absence of free - moving charge carriers. For example, metals are good conductors because of their delocalized electrons, while many non - metals and ionic compounds in solid form are poor conductors. By measuring conductivity, we can compare the result to known values for pure substances to make an identification.

Answer:

Testing conductivity can help identify a pure substance by comparing the measured conductivity value to known values for different pure substances, as the conductivity is related to the substance's atomic/molecular structure and charge - carrier availability.